networking/httpd.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * httpd implementation for busybox
   4  *
   5  * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org>
   6  * Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru>
   7  *
   8  * simplify patch stolen from libbb without using strdup
   9  *
  10  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  11  *
  12  *****************************************************************************
  13  *
  14  * Typical usage:
  15  *   for non root user
  16  * httpd -p 8080 -h $HOME/public_html
  17  *   or for daemon start from rc script with uid=0:
  18  * httpd -u www
  19  * This is equivalent if www user have uid=80 to
  20  * httpd -p 80 -u 80 -h /www -c /etc/httpd.conf -r "Web Server Authentication"
  21  *
  22  *
  23  * When a url starts by "/cgi-bin/" it is assumed to be a cgi script.  The
  24  * server changes directory to the location of the script and executes it
  25  * after setting QUERY_STRING and other environment variables.
  26  *
  27  * Doc:
  28  * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html
  29  *
  30  * The applet can also be invoked as a url arg decoder and html text encoder
  31  * as follows:
  32  *  foo=`httpd -d $foo`           # decode "Hello%20World" as "Hello World"
  33  *  bar=`httpd -e "<Hello World>"`  # encode as "&#60Hello&#32World&#62"
  34  * Note that url encoding for arguments is not the same as html encoding for
  35  * presentation.  -d decodes a url-encoded argument while -e encodes in html
  36  * for page display.
  37  *
  38  * httpd.conf has the following format:
  39  *
  40  * H:/serverroot     # define the server root. It will override -h
  41  * A:172.20.         # Allow address from 172.20.0.0/16
  42  * A:10.0.0.0/25     # Allow any address from 10.0.0.0-10.0.0.127
  43  * A:10.0.0.0/255.255.255.128  # Allow any address that previous set
  44  * A:127.0.0.1       # Allow local loopback connections
  45  * D:*               # Deny from other IP connections
  46  * E404:/path/e404.html # /path/e404.html is the 404 (not found) error page
  47  * I:index.html      # Show index.html when a directory is requested
  48  *
  49  * P:/url:[http://]hostname[:port]/new/path
  50  *                   # When /urlXXXXXX is requested, reverse proxy
  51  *                   # it to http://hostname[:port]/new/pathXXXXXX
  52  *
  53  * /cgi-bin:foo:bar  # Require user foo, pwd bar on urls starting with /cgi-bin/
  54  * /adm:admin:setup  # Require user admin, pwd setup on urls starting with /adm/
  55  * /adm:toor:PaSsWd  # or user toor, pwd PaSsWd on urls starting with /adm/
  56  * .au:audio/basic   # additional mime type for audio.au files
  57  * *.php:/path/php   # running cgi.php scripts through an interpreter
  58  *
  59  * A/D may be as a/d or allow/deny - only first char matters.
  60  * Deny/Allow IP logic:
  61  *  - Default is to allow all (Allow all (A:*) is a no-op).
  62  *  - Deny rules take precedence over allow rules.
  63  *  - "Deny all" rule (D:*) is applied last.
  64  *
  65  * Example:
  66  *   1. Allow only specified addresses
  67  *     A:172.20          # Allow any address that begins with 172.20.
  68  *     A:10.10.          # Allow any address that begins with 10.10.
  69  *     A:127.0.0.1       # Allow local loopback connections
  70  *     D:*               # Deny from other IP connections
  71  *
  72  *   2. Only deny specified addresses
  73  *     D:1.2.3.        # deny from 1.2.3.0 - 1.2.3.255
  74  *     D:2.3.4.        # deny from 2.3.4.0 - 2.3.4.255
  75  *     A:*             # (optional line added for clarity)
  76  *
  77  * If a sub directory contains a config file it is parsed and merged with
  78  * any existing settings as if it was appended to the original configuration.
  79  *
  80  * subdir paths are relative to the containing subdir and thus cannot
  81  * affect the parent rules.
  82  *
  83  * Note that since the sub dir is parsed in the forked thread servicing the
  84  * subdir http request, any merge is discarded when the process exits.  As a
  85  * result, the subdir settings only have a lifetime of a single request.
  86  *
  87  * Custom error pages can contain an absolute path or be relative to
  88  * 'home_httpd'. Error pages are to be static files (no CGI or script). Error
  89  * page can only be defined in the root configuration file and are not taken
  90  * into account in local (directories) config files.
  91  *
  92  * If -c is not set, an attempt will be made to open the default
  93  * root configuration file.  If -c is set and the file is not found, the
  94  * server exits with an error.
  95  *
  96  */
  97
  98 #include "libbb.h"
  99 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
 100 #include <sys/sendfile.h>
 101 #endif
 102
 103 //#define DEBUG 1
 104 #define DEBUG 0
 105
 106 #define IOBUF_SIZE 8192    /* IO buffer */
 107
 108 /* amount of buffering in a pipe */
 109 #ifndef PIPE_BUF
 110 # define PIPE_BUF 4096
 111 #endif
 112 #if PIPE_BUF >= IOBUF_SIZE
 113 # error "PIPE_BUF >= IOBUF_SIZE"
 114 #endif
 115
 116 #define HEADER_READ_TIMEOUT 60
 117
 118 static const char default_path_httpd_conf[] ALIGN1 = "/etc";
 119 static const char httpd_conf[] ALIGN1 = "httpd.conf";
 120 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
 121
 122 typedef struct has_next_ptr {
 123         struct has_next_ptr *next;
 124 } has_next_ptr;
 125
 126 /* Must have "next" as a first member */
 127 typedef struct Htaccess {
 128         struct Htaccess *next;
 129         char *after_colon;
 130         char before_colon[1];  /* really bigger, must be last */
 131 } Htaccess;
 132
 133 /* Must have "next" as a first member */
 134 typedef struct Htaccess_IP {
 135         struct Htaccess_IP *next;
 136         unsigned ip;
 137         unsigned mask;
 138         int allow_deny;
 139 } Htaccess_IP;
 140
 141 /* Must have "next" as a first member */
 142 typedef struct Htaccess_Proxy {
 143         struct Htaccess_Proxy *next;
 144         char *url_from;
 145         char *host_port;
 146         char *url_to;
 147 } Htaccess_Proxy;
 148
 149 enum {
 150         HTTP_OK = 200,
 151         HTTP_PARTIAL_CONTENT = 206,
 152         HTTP_MOVED_TEMPORARILY = 302,
 153         HTTP_BAD_REQUEST = 400,       /* malformed syntax */
 154         HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
 155         HTTP_NOT_FOUND = 404,
 156         HTTP_FORBIDDEN = 403,
 157         HTTP_REQUEST_TIMEOUT = 408,
 158         HTTP_NOT_IMPLEMENTED = 501,   /* used for unrecognized requests */
 159         HTTP_INTERNAL_SERVER_ERROR = 500,
 160         HTTP_CONTINUE = 100,
 161 #if 0   /* future use */
 162         HTTP_SWITCHING_PROTOCOLS = 101,
 163         HTTP_CREATED = 201,
 164         HTTP_ACCEPTED = 202,
 165         HTTP_NON_AUTHORITATIVE_INFO = 203,
 166         HTTP_NO_CONTENT = 204,
 167         HTTP_MULTIPLE_CHOICES = 300,
 168         HTTP_MOVED_PERMANENTLY = 301,
 169         HTTP_NOT_MODIFIED = 304,
 170         HTTP_PAYMENT_REQUIRED = 402,
 171         HTTP_BAD_GATEWAY = 502,
 172         HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
 173         HTTP_RESPONSE_SETSIZE = 0xffffffff
 174 #endif
 175 };
 176
 177 static const uint16_t http_response_type[] ALIGN2 = {
 178         HTTP_OK,
 179 #if ENABLE_FEATURE_HTTPD_RANGES
 180         HTTP_PARTIAL_CONTENT,
 181 #endif
 182         HTTP_MOVED_TEMPORARILY,
 183         HTTP_REQUEST_TIMEOUT,
 184         HTTP_NOT_IMPLEMENTED,
 185 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 186         HTTP_UNAUTHORIZED,
 187 #endif
 188         HTTP_NOT_FOUND,
 189         HTTP_BAD_REQUEST,
 190         HTTP_FORBIDDEN,
 191         HTTP_INTERNAL_SERVER_ERROR,
 192 #if 0   /* not implemented */
 193         HTTP_CREATED,
 194         HTTP_ACCEPTED,
 195         HTTP_NO_CONTENT,
 196         HTTP_MULTIPLE_CHOICES,
 197         HTTP_MOVED_PERMANENTLY,
 198         HTTP_NOT_MODIFIED,
 199         HTTP_BAD_GATEWAY,
 200         HTTP_SERVICE_UNAVAILABLE,
 201 #endif
 202 };
 203
 204 static const struct {
 205         const char *name;
 206         const char *info;
 207 } http_response[ARRAY_SIZE(http_response_type)] = {
 208         { "OK", NULL },
 209 #if ENABLE_FEATURE_HTTPD_RANGES
 210         { "Partial Content", NULL },
 211 #endif
 212         { "Found", NULL },
 213         { "Request Timeout", "No request appeared within 60 seconds" },
 214         { "Not Implemented", "The requested method is not recognized" },
 215 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 216         { "Unauthorized", "" },
 217 #endif
 218         { "Not Found", "The requested URL was not found" },
 219         { "Bad Request", "Unsupported method" },
 220         { "Forbidden", ""  },
 221         { "Internal Server Error", "Internal Server Error" },
 222 #if 0   /* not implemented */
 223         { "Created" },
 224         { "Accepted" },
 225         { "No Content" },
 226         { "Multiple Choices" },
 227         { "Moved Permanently" },
 228         { "Not Modified" },
 229         { "Bad Gateway", "" },
 230         { "Service Unavailable", "" },
 231 #endif
 232 };
 233
 234
 235 struct globals {
 236         int verbose;            /* must be int (used by getopt32) */
 237         smallint flg_deny_all;
 238
 239         unsigned rmt_ip;        /* used for IP-based allow/deny rules */
 240         time_t last_mod;
 241         char *rmt_ip_str;       /* for $REMOTE_ADDR and $REMOTE_PORT */
 242         const char *bind_addr_or_port;
 243
 244         const char *g_query;
 245         const char *configFile;
 246         const char *home_httpd;
 247         const char *index_page;
 248
 249         const char *found_mime_type;
 250         const char *found_moved_temporarily;
 251         Htaccess_IP *ip_a_d;    /* config allow/deny lines */
 252
 253         USE_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
 254         USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
 255         USE_FEATURE_HTTPD_CGI(char *referer;)
 256         USE_FEATURE_HTTPD_CGI(char *user_agent;)
 257         USE_FEATURE_HTTPD_CGI(char *host;)
 258         USE_FEATURE_HTTPD_CGI(char *http_accept;)
 259         USE_FEATURE_HTTPD_CGI(char *http_accept_language;)
 260
 261         off_t file_size;        /* -1 - unknown */
 262 #if ENABLE_FEATURE_HTTPD_RANGES
 263         off_t range_start;
 264         off_t range_end;
 265         off_t range_len;
 266 #endif
 267
 268 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 269         Htaccess *g_auth;       /* config user:password lines */
 270 #endif
 271 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 272         Htaccess *mime_a;       /* config mime types */
 273 #endif
 274 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 275         Htaccess *script_i;     /* config script interpreters */
 276 #endif
 277         char *iobuf;            /* [IOBUF_SIZE] */
 278 #define hdr_buf bb_common_bufsiz1
 279         char *hdr_ptr;
 280         int hdr_cnt;
 281 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 282         const char *http_error_page[ARRAY_SIZE(http_response_type)];
 283 #endif
 284 #if ENABLE_FEATURE_HTTPD_PROXY
 285         Htaccess_Proxy *proxy;
 286 #endif
 287 };
 288 #define G (*ptr_to_globals)
 289 #define verbose           (G.verbose          )
 290 #define flg_deny_all      (G.flg_deny_all     )
 291 #define rmt_ip            (G.rmt_ip           )
 292 #define bind_addr_or_port (G.bind_addr_or_port)
 293 #define g_query           (G.g_query          )
 294 #define configFile        (G.configFile       )
 295 #define home_httpd        (G.home_httpd       )
 296 #define index_page        (G.index_page       )
 297 #define found_mime_type   (G.found_mime_type  )
 298 #define found_moved_temporarily (G.found_moved_temporarily)
 299 #define last_mod          (G.last_mod         )
 300 #define ip_a_d            (G.ip_a_d           )
 301 #define g_realm           (G.g_realm          )
 302 #define remoteuser        (G.remoteuser       )
 303 #define referer           (G.referer          )
 304 #define user_agent        (G.user_agent       )
 305 #define host              (G.host             )
 306 #define http_accept       (G.http_accept      )
 307 #define http_accept_language (G.http_accept_language)
 308 #define file_size         (G.file_size        )
 309 #if ENABLE_FEATURE_HTTPD_RANGES
 310 #define range_start       (G.range_start      )
 311 #define range_end         (G.range_end        )
 312 #define range_len         (G.range_len        )
 313 #endif
 314 #define rmt_ip_str        (G.rmt_ip_str       )
 315 #define g_auth            (G.g_auth           )
 316 #define mime_a            (G.mime_a           )
 317 #define script_i          (G.script_i         )
 318 #define iobuf             (G.iobuf            )
 319 #define hdr_ptr           (G.hdr_ptr          )
 320 #define hdr_cnt           (G.hdr_cnt          )
 321 #define http_error_page   (G.http_error_page  )
 322 #define proxy             (G.proxy            )
 323 #define INIT_G() do { \
 324         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 325         USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
 326         bind_addr_or_port = "80"; \
 327         index_page = "index.html"; \
 328         file_size = -1; \
 329 } while (0)
 330
 331 #if !ENABLE_FEATURE_HTTPD_RANGES
 332 enum {
 333         range_start = 0,
 334         range_end = MAXINT(off_t) - 1,
 335         range_len = MAXINT(off_t),
 336 };
 337 #endif
 338
 339
 340 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
 341
 342 /* Prototypes */
 343 enum {
 344         SEND_HEADERS     = (1 << 0),
 345         SEND_BODY        = (1 << 1),
 346         SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY,
 347 };
 348 static void send_file_and_exit(const char *url, int what) NORETURN;
 349
 350 static void free_llist(has_next_ptr **pptr)
 351 {
 352         has_next_ptr *cur = *pptr;
 353         while (cur) {
 354                 has_next_ptr *t = cur;
 355                 cur = cur->next;
 356                 free(t);
 357         }
 358         *pptr = NULL;
 359 }
 360
 361 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
 362  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
 363  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 364 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
 365 {
 366         free_llist((has_next_ptr**)pptr);
 367 }
 368 #endif
 369
 370 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
 371 {
 372         free_llist((has_next_ptr**)pptr);
 373 }
 374
 375 /* Returns presumed mask width in bits or < 0 on error.
 376  * Updates strp, stores IP at provided pointer */
 377 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
 378 {
 379         const char *p = *strp;
 380         int auto_mask = 8;
 381         unsigned ip = 0;
 382         int j;
 383
 384         if (*p == '/')
 385                 return -auto_mask;
 386
 387         for (j = 0; j < 4; j++) {
 388                 unsigned octet;
 389
 390                 if ((*p < '0' || *p > '9') && *p != '/' && *p)
 391                         return -auto_mask;
 392                 octet = 0;
 393                 while (*p >= '0' && *p <= '9') {
 394                         octet *= 10;
 395                         octet += *p - '0';
 396                         if (octet > 255)
 397                                 return -auto_mask;
 398                         p++;
 399                 }
 400                 if (*p == '.')
 401                         p++;
 402                 if (*p != '/' && *p)
 403                         auto_mask += 8;
 404                 ip = (ip << 8) | octet;
 405         }
 406         if (*p) {
 407                 if (*p != endc)
 408                         return -auto_mask;
 409                 p++;
 410                 if (*p == '\0')
 411                         return -auto_mask;
 412         }
 413         *ipp = ip;
 414         *strp = p;
 415         return auto_mask;
 416 }
 417
 418 /* Returns 0 on success. Stores IP and mask at provided pointers */
 419 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
 420 {
 421         int i;
 422         unsigned mask;
 423         char *p;
 424
 425         i = scan_ip(&str, ipp, '/');
 426         if (i < 0)
 427                 return i;
 428
 429         if (*str) {
 430                 /* there is /xxx after dotted-IP address */
 431                 i = bb_strtou(str, &p, 10);
 432                 if (*p == '.') {
 433                         /* 'xxx' itself is dotted-IP mask, parse it */
 434                         /* (return 0 (success) only if it has N.N.N.N form) */
 435                         return scan_ip(&str, maskp, '\0') - 32;
 436                 }
 437                 if (*p)
 438                         return -1;
 439         }
 440
 441         if (i > 32)
 442                 return -1;
 443
 444         if (sizeof(unsigned) == 4 && i == 32) {
 445                 /* mask >>= 32 below may not work */
 446                 mask = 0;
 447         } else {
 448                 mask = 0xffffffff;
 449                 mask >>= i;
 450         }
 451         /* i == 0 -> *maskp = 0x00000000
 452          * i == 1 -> *maskp = 0x80000000
 453          * i == 4 -> *maskp = 0xf0000000
 454          * i == 31 -> *maskp = 0xfffffffe
 455          * i == 32 -> *maskp = 0xffffffff */
 456         *maskp = (uint32_t)(~mask);
 457         return 0;
 458 }
 459
 460 /*
 461  * Parse configuration file into in-memory linked list.
 462  *
 463  * The first non-white character is examined to determine if the config line
 464  * is one of the following:
 465  *    .ext:mime/type   # new mime type not compiled into httpd
 466  *    [adAD]:from      # ip address allow/deny, * for wildcard
 467  *    /path:user:pass  # username/password
 468  *    Ennn:error.html  # error page for status nnn
 469  *    P:/url:[http://]hostname[:port]/new/path # reverse proxy
 470  *
 471  * Any previous IP rules are discarded.
 472  * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
 473  * are also discarded.  That is, previous settings are retained if flag is
 474  * SUBDIR_PARSE.
 475  * Error pages are only parsed on the main config file.
 476  *
 477  * path   Path where to look for httpd.conf (without filename).
 478  * flag   Type of the parse request.
 479  */
 480 /* flag */
 481 #define FIRST_PARSE          0
 482 #define SUBDIR_PARSE         1
 483 #define SIGNALED_PARSE       2
 484 #define FIND_FROM_HTTPD_ROOT 3
 485 static void parse_conf(const char *path, int flag)
 486 {
 487         FILE *f;
 488 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 489         Htaccess *prev;
 490 #endif
 491 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
 492  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
 493  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 494         Htaccess *cur;
 495 #endif
 496         const char *filename = configFile;
 497         char buf[160];
 498         char *p, *p0;
 499         char *after_colon;
 500         Htaccess_IP *pip;
 501
 502         /* discard old rules */
 503         free_Htaccess_IP_list(&ip_a_d);
 504         flg_deny_all = 0;
 505 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
 506  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
 507  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 508         /* retain previous auth and mime config only for subdir parse */
 509         if (flag != SUBDIR_PARSE) {
 510 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 511                 free_Htaccess_list(&g_auth);
 512 #endif
 513 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 514                 free_Htaccess_list(&mime_a);
 515 #endif
 516 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 517                 free_Htaccess_list(&script_i);
 518 #endif
 519         }
 520 #endif
 521
 522         if (flag == SUBDIR_PARSE || filename == NULL) {
 523                 filename = alloca(strlen(path) + sizeof(httpd_conf) + 2);
 524                 sprintf((char *)filename, "%s/%s", path, httpd_conf);
 525         }
 526
 527         while ((f = fopen_for_read(filename)) == NULL) {
 528                 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
 529                         /* config file not found, no changes to config */
 530                         return;
 531                 }
 532                 if (configFile && flag == FIRST_PARSE) /* if -c option given */
 533                         bb_simple_perror_msg_and_die(filename);
 534                 flag = FIND_FROM_HTTPD_ROOT;
 535                 filename = httpd_conf;
 536         }
 537
 538 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 539         prev = g_auth;
 540 #endif
 541         /* This could stand some work */
 542         while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
 543                 after_colon = NULL;
 544                 for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) {
 545                         if (!isspace(*p0)) {
 546                                 *p++ = *p0;
 547                                 if (*p0 == ':' && after_colon == NULL)
 548                                         after_colon = p;
 549                         }
 550                 }
 551                 *p = '\0';
 552
 553                 /* test for empty or strange line */
 554                 if (after_colon == NULL || *after_colon == '\0')
 555                         continue;
 556                 p0 = buf;
 557                 if (*p0 == 'd' || *p0 == 'a')
 558                         *p0 -= 0x20; /* a/d -> A/D */
 559                 if (*after_colon == '*') {
 560                         if (*p0 == 'D') {
 561                                 /* memorize "deny all" */
 562                                 flg_deny_all = 1;
 563                         }
 564                         /* skip assumed "A:*", it is a default anyway */
 565                         continue;
 566                 }
 567
 568                 if (*p0 == 'A' || *p0 == 'D') {
 569                         /* storing current config IP line */
 570                         pip = xzalloc(sizeof(Htaccess_IP));
 571                         if (scan_ip_mask(after_colon, &(pip->ip), &(pip->mask))) {
 572                                 /* IP{/mask} syntax error detected, protect all */
 573                                 *p0 = 'D';
 574                                 pip->mask = 0;
 575                         }
 576                         pip->allow_deny = *p0;
 577                         if (*p0 == 'D') {
 578                                 /* Deny:from_IP - prepend */
 579                                 pip->next = ip_a_d;
 580                                 ip_a_d = pip;
 581                         } else {
 582                                 /* A:from_IP - append (thus D precedes A) */
 583                                 Htaccess_IP *prev_IP = ip_a_d;
 584                                 if (prev_IP == NULL) {
 585                                         ip_a_d = pip;
 586                                 } else {
 587                                         while (prev_IP->next)
 588                                                 prev_IP = prev_IP->next;
 589                                         prev_IP->next = pip;
 590                                 }
 591                         }
 592                         continue;
 593                 }
 594
 595 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 596                 if (flag == FIRST_PARSE && *p0 == 'E') {
 597                         unsigned i;
 598                         int status = atoi(++p0); /* error status code */
 599                         if (status < HTTP_CONTINUE) {
 600                                 bb_error_msg("config error '%s' in '%s'", buf, filename);
 601                                 continue;
 602                         }
 603                         /* then error page; find matching status */
 604                         for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
 605                                 if (http_response_type[i] == status) {
 606                                         /* We chdir to home_httpd, thus no need to
 607                                          * concat_path_file(home_httpd, after_colon)
 608                                          * here */
 609                                         http_error_page[i] = xstrdup(after_colon);
 610                                         break;
 611                                 }
 612                         }
 613                         continue;
 614                 }
 615 #endif
 616
 617 #if ENABLE_FEATURE_HTTPD_PROXY
 618                 if (flag == FIRST_PARSE && *p0 == 'P') {
 619                         /* P:/url:[http://]hostname[:port]/new/path */
 620                         char *url_from, *host_port, *url_to;
 621                         Htaccess_Proxy *proxy_entry;
 622
 623                         url_from = after_colon;
 624                         host_port = strchr(after_colon, ':');
 625                         if (host_port == NULL) {
 626                                 bb_error_msg("config error '%s' in '%s'", buf, filename);
 627                                 continue;
 628                         }
 629                         *host_port++ = '\0';
 630                         if (strncmp(host_port, "http://", 7) == 0)
 631                                 host_port += 7;
 632                         if (*host_port == '\0') {
 633                                 bb_error_msg("config error '%s' in '%s'", buf, filename);
 634                                 continue;
 635                         }
 636                         url_to = strchr(host_port, '/');
 637                         if (url_to == NULL) {
 638                                 bb_error_msg("config error '%s' in '%s'", buf, filename);
 639                                 continue;
 640                         }
 641                         *url_to = '\0';
 642                         proxy_entry = xzalloc(sizeof(Htaccess_Proxy));
 643                         proxy_entry->url_from = xstrdup(url_from);
 644                         proxy_entry->host_port = xstrdup(host_port);
 645                         *url_to = '/';
 646                         proxy_entry->url_to = xstrdup(url_to);
 647                         proxy_entry->next = proxy;
 648                         proxy = proxy_entry;
 649                         continue;
 650                 }
 651 #endif
 652
 653 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 654                 if (*p0 == '/') {
 655                         /* make full path from httpd root / current_path / config_line_path */
 656                         const char *tp = (flag == SUBDIR_PARSE ? path : "");
 657                         p0 = xmalloc(strlen(tp) + (after_colon - buf) + 2 + strlen(after_colon));
 658                         after_colon[-1] = '\0';
 659                         sprintf(p0, "/%s%s", tp, buf);
 660
 661                         /* looks like bb_simplify_path... */
 662                         tp = p = p0;
 663                         do {
 664                                 if (*p == '/') {
 665                                         if (*tp == '/') {    /* skip duplicate (or initial) slash */
 666                                                 continue;
 667                                         }
 668                                         if (*tp == '.') {
 669                                                 if (tp[1] == '/' || tp[1] == '\0') { /* remove extra '.' */
 670                                                         continue;
 671                                                 }
 672                                                 if ((tp[1] == '.') && (tp[2] == '/' || tp[2] == '\0')) {
 673                                                         ++tp;
 674                                                         if (p > p0) {
 675                                                                 while (*--p != '/') /* omit previous dir */
 676                                                                         continue;
 677                                                         }
 678                                                         continue;
 679                                                 }
 680                                         }
 681                                 }
 682                                 *++p = *tp;
 683                         } while (*++tp);
 684
 685                         if ((p == p0) || (*p != '/')) { /* not a trailing slash */
 686                                 ++p;                    /* so keep last character */
 687                         }
 688                         *p = ':';
 689                         strcpy(p + 1, after_colon);
 690                 }
 691 #endif
 692                 if (*p0 == 'I') {
 693                         index_page = xstrdup(after_colon);
 694                         continue;
 695                 }
 696
 697                 /* Do not allow jumping around using H in subdir's configs */
 698                 if (flag == FIRST_PARSE && *p0 == 'H') {
 699                         home_httpd = xstrdup(after_colon);
 700                         xchdir(home_httpd);
 701                         continue;
 702                 }
 703
 704 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \
 705  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \
 706  || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 707                 /* storing current config line */
 708                 cur = xzalloc(sizeof(Htaccess) + strlen(p0));
 709                 strcpy(cur->before_colon, p0);
 710 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 711                 if (*p0 == '/') /* was malloced - see above */
 712                         free(p0);
 713 #endif
 714                 cur->after_colon = strchr(cur->before_colon, ':');
 715                 *cur->after_colon++ = '\0';
 716 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 717                 if (cur->before_colon[0] == '.') {
 718                         /* .mime line: prepend to mime_a list */
 719                         cur->next = mime_a;
 720                         mime_a = cur;
 721                         continue;
 722                 }
 723 #endif
 724 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 725                 if (cur->before_colon[0] == '*' && cur->before_colon[1] == '.') {
 726                         /* script interpreter line: prepend to script_i list */
 727                         cur->next = script_i;
 728                         script_i = cur;
 729                         continue;
 730                 }
 731 #endif
 732 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 733 //TODO: we do not test for leading "/"??
 734 //also, do we leak cur if BASIC_AUTH is off?
 735                 if (prev == NULL) {
 736                         /* first line */
 737                         g_auth = prev = cur;
 738                 } else {
 739                         /* sort path, if current length eq or bigger then move up */
 740                         Htaccess *prev_hti = g_auth;
 741                         size_t l = strlen(cur->before_colon);
 742                         Htaccess *hti;
 743
 744                         for (hti = prev_hti; hti; hti = hti->next) {
 745                                 if (l >= strlen(hti->before_colon)) {
 746                                         /* insert before hti */
 747                                         cur->next = hti;
 748                                         if (prev_hti != hti) {
 749                                                 prev_hti->next = cur;
 750                                         } else {
 751                                                 /* insert as top */
 752                                                 g_auth = cur;
 753                                         }
 754                                         break;
 755                                 }
 756                                 if (prev_hti != hti)
 757                                         prev_hti = prev_hti->next;
 758                         }
 759                         if (!hti) {       /* not inserted, add to bottom */
 760                                 prev->next = cur;
 761                                 prev = cur;
 762                         }
 763                 }
 764 #endif /* BASIC_AUTH */
 765 #endif /* BASIC_AUTH || MIME_TYPES || SCRIPT_INTERPR */
 766          } /* while (fgets) */
 767          fclose(f);
 768 }
 769
 770 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
 771 /*
 772  * Given a string, html-encode special characters.
 773  * This is used for the -e command line option to provide an easy way
 774  * for scripts to encode result data without confusing browsers.  The
 775  * returned string pointer is memory allocated by malloc().
 776  *
 777  * Returns a pointer to the encoded string (malloced).
 778  */
 779 static char *encodeString(const char *string)
 780 {
 781         /* take the simple route and encode everything */
 782         /* could possibly scan once to get length.     */
 783         int len = strlen(string);
 784         char *out = xmalloc(len * 6 + 1);
 785         char *p = out;
 786         char ch;
 787
 788         while ((ch = *string++)) {
 789                 /* very simple check for what to encode */
 790                 if (isalnum(ch))
 791                         *p++ = ch;
 792                 else
 793                         p += sprintf(p, "&#%d;", (unsigned char) ch);
 794         }
 795         *p = '\0';
 796         return out;
 797 }
 798 #endif          /* FEATURE_HTTPD_ENCODE_URL_STR */
 799
 800 /*
 801  * Given a URL encoded string, convert it to plain ascii.
 802  * Since decoding always makes strings smaller, the decode is done in-place.
 803  * Thus, callers should xstrdup() the argument if they do not want the
 804  * argument modified.  The return is the original pointer, allowing this
 805  * function to be easily used as arguments to other functions.
 806  *
 807  * string    The first string to decode.
 808  * option_d  1 if called for httpd -d
 809  *
 810  * Returns a pointer to the decoded string (same as input).
 811  */
 812 static unsigned hex_to_bin(unsigned char c)
 813 {
 814         unsigned v;
 815
 816         v = c - '0';
 817         if (v <= 9)
 818                 return v;
 819         /* c | 0x20: letters to lower case, non-letters
 820          * to (potentially different) non-letters */
 821         v = (unsigned)(c | 0x20) - 'a';
 822         if (v <= 5)
 823                 return v + 10;
 824         return ~0;
 825 }
 826 /* For testing:
 827 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
 828 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
 829 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
 830 */
 831 static char *decodeString(char *orig, int option_d)
 832 {
 833         /* note that decoded string is always shorter than original */
 834         char *string = orig;
 835         char *ptr = string;
 836         char c;
 837
 838         while ((c = *ptr++) != '\0') {
 839                 unsigned v;
 840
 841                 if (option_d && c == '+') {
 842                         *string++ = ' ';
 843                         continue;
 844                 }
 845                 if (c != '%') {
 846                         *string++ = c;
 847                         continue;
 848                 }
 849                 v = hex_to_bin(ptr[0]);
 850                 if (v > 15) {
 851  bad_hex:
 852                         if (!option_d)
 853                                 return NULL;
 854                         *string++ = '%';
 855                         continue;
 856                 }
 857                 v = (v * 16) | hex_to_bin(ptr[1]);
 858                 if (v > 255)
 859                         goto bad_hex;
 860                 if (!option_d && (v == '/' || v == '\0')) {
 861                         /* caller takes it as indication of invalid
 862                          * (dangerous wrt exploits) chars */
 863                         return orig + 1;
 864                 }
 865                 *string++ = v;
 866                 ptr += 2;
 867         }
 868         *string = '\0';
 869         return orig;
 870 }
 871
 872 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 873 /*
 874  * Decode a base64 data stream as per rfc1521.
 875  * Note that the rfc states that non base64 chars are to be ignored.
 876  * Since the decode always results in a shorter size than the input,
 877  * it is OK to pass the input arg as an output arg.
 878  * Parameter: a pointer to a base64 encoded string.
 879  * Decoded data is stored in-place.
 880  */
 881 static void decodeBase64(char *Data)
 882 {
 883         const unsigned char *in = (const unsigned char *)Data;
 884         /* The decoded size will be at most 3/4 the size of the encoded */
 885         unsigned ch = 0;
 886         int i = 0;
 887
 888         while (*in) {
 889                 int t = *in++;
 890
 891                 if (t >= '0' && t <= '9')
 892                         t = t - '0' + 52;
 893                 else if (t >= 'A' && t <= 'Z')
 894                         t = t - 'A';
 895                 else if (t >= 'a' && t <= 'z')
 896                         t = t - 'a' + 26;
 897                 else if (t == '+')
 898                         t = 62;
 899                 else if (t == '/')
 900                         t = 63;
 901                 else if (t == '=')
 902                         t = 0;
 903                 else
 904                         continue;
 905
 906                 ch = (ch << 6) | t;
 907                 i++;
 908                 if (i == 4) {
 909                         *Data++ = (char) (ch >> 16);
 910                         *Data++ = (char) (ch >> 8);
 911                         *Data++ = (char) ch;
 912                         i = 0;
 913                 }
 914         }
 915         *Data = '\0';
 916 }
 917 #endif
 918
 919 /*
 920  * Create a listen server socket on the designated port.
 921  */
 922 static int openServer(void)
 923 {
 924         unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
 925         if (!errno && n && n <= 0xffff)
 926                 n = create_and_bind_stream_or_die(NULL, n);
 927         else
 928                 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
 929         xlisten(n, 9);
 930         return n;
 931 }
 932
 933 /*
 934  * Log the connection closure and exit.
 935  */
 936 static void log_and_exit(void) NORETURN;
 937 static void log_and_exit(void)
 938 {
 939         /* Paranoia. IE said to be buggy. It may send some extra data
 940          * or be confused by us just exiting without SHUT_WR. Oh well. */
 941         shutdown(1, SHUT_WR);
 942         /* Why??
 943         (this also messes up stdin when user runs httpd -i from terminal)
 944         ndelay_on(0);
 945         while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0)
 946                 continue;
 947         */
 948
 949         if (verbose > 2)
 950                 bb_error_msg("closed");
 951         _exit(xfunc_error_retval);
 952 }
 953
 954 /*
 955  * Create and send HTTP response headers.
 956  * The arguments are combined and sent as one write operation.  Note that
 957  * IE will puke big-time if the headers are not sent in one packet and the
 958  * second packet is delayed for any reason.
 959  * responseNum - the result code to send.
 960  */
 961 static void send_headers(int responseNum)
 962 {
 963         static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
 964
 965         const char *responseString = "";
 966         const char *infoString = NULL;
 967         const char *mime_type;
 968 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 969         const char *error_page = NULL;
 970 #endif
 971         unsigned i;
 972         time_t timer = time(0);
 973         char tmp_str[80];
 974         int len;
 975
 976         for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
 977                 if (http_response_type[i] == responseNum) {
 978                         responseString = http_response[i].name;
 979                         infoString = http_response[i].info;
 980 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 981                         error_page = http_error_page[i];
 982 #endif
 983                         break;
 984                 }
 985         }
 986         /* error message is HTML */
 987         mime_type = responseNum == HTTP_OK ?
 988                                 found_mime_type : "text/html";
 989
 990         if (verbose)
 991                 bb_error_msg("response:%u", responseNum);
 992
 993         /* emit the current date */
 994         strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
 995         len = sprintf(iobuf,
 996                         "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
 997                         "Date: %s\r\nConnection: close\r\n",
 998                         responseNum, responseString, mime_type, tmp_str);
 999
1000 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1001         if (responseNum == HTTP_UNAUTHORIZED) {
1002                 len += sprintf(iobuf + len,
1003                                 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
1004                                 g_realm);
1005         }
1006 #endif
1007         if (responseNum == HTTP_MOVED_TEMPORARILY) {
1008                 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
1009                                 found_moved_temporarily,
1010                                 (g_query ? "?" : ""),
1011                                 (g_query ? g_query : ""));
1012         }
1013
1014 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
1015         if (error_page && access(error_page, R_OK) == 0) {
1016                 strcat(iobuf, "\r\n");
1017                 len += 2;
1018
1019                 if (DEBUG)
1020                         fprintf(stderr, "headers: '%s'\n", iobuf);
1021                 full_write(STDOUT_FILENO, iobuf, len);
1022                 if (DEBUG)
1023                         fprintf(stderr, "writing error page: '%s'\n", error_page);
1024                 return send_file_and_exit(error_page, SEND_BODY);
1025         }
1026 #endif
1027
1028         if (file_size != -1) {    /* file */
1029                 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
1030 #if ENABLE_FEATURE_HTTPD_RANGES
1031                 if (responseNum == HTTP_PARTIAL_CONTENT) {
1032                         len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
1033                                         range_start,
1034                                         range_end,
1035                                         file_size);
1036                         file_size = range_end - range_start + 1;
1037                 }
1038 #endif
1039                 len += sprintf(iobuf + len,
1040 #if ENABLE_FEATURE_HTTPD_RANGES
1041                         "Accept-Ranges: bytes\r\n"
1042 #endif
1043                         "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
1044                                 tmp_str,
1045                                 "Content-length:",
1046                                 file_size
1047                 );
1048         }
1049         iobuf[len++] = '\r';
1050         iobuf[len++] = '\n';
1051         if (infoString) {
1052                 len += sprintf(iobuf + len,
1053                                 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1054                                 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
1055                                 responseNum, responseString,
1056                                 responseNum, responseString, infoString);
1057         }
1058         if (DEBUG)
1059                 fprintf(stderr, "headers: '%s'\n", iobuf);
1060         if (full_write(STDOUT_FILENO, iobuf, len) != len) {
1061                 if (verbose > 1)
1062                         bb_perror_msg("error");
1063                 log_and_exit();
1064         }
1065 }
1066
1067 static void send_headers_and_exit(int responseNum) NORETURN;
1068 static void send_headers_and_exit(int responseNum)
1069 {
1070         send_headers(responseNum);
1071         log_and_exit();
1072 }
1073
1074 /*
1075  * Read from the socket until '\n' or EOF. '\r' chars are removed.
1076  * '\n' is replaced with NUL.
1077  * Return number of characters read or 0 if nothing is read
1078  * ('\r' and '\n' are not counted).
1079  * Data is returned in iobuf.
1080  */
1081 static int get_line(void)
1082 {
1083         int count = 0;
1084         char c;
1085
1086         while (1) {
1087                 if (hdr_cnt <= 0) {
1088                         hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1089                         if (hdr_cnt <= 0)
1090                                 break;
1091                         hdr_ptr = hdr_buf;
1092                 }
1093                 iobuf[count] = c = *hdr_ptr++;
1094                 hdr_cnt--;
1095
1096                 if (c == '\r')
1097                         continue;
1098                 if (c == '\n') {
1099                         iobuf[count] = '\0';
1100                         return count;
1101                 }
1102                 if (count < (IOBUF_SIZE - 1))      /* check overflow */
1103                         count++;
1104         }
1105         return count;
1106 }
1107
1108 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1109
1110 /* gcc 4.2.1 fares better with NOINLINE */
1111 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN;
1112 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1113 {
1114         enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1115         struct pollfd pfd[3];
1116         int out_cnt; /* we buffer a bit of initial CGI output */
1117         int count;
1118
1119         /* iobuf is used for CGI -> network data,
1120          * hdr_buf is for network -> CGI data (POSTDATA) */
1121
1122         /* If CGI dies, we still want to correctly finish reading its output
1123          * and send it to the peer. So please no SIGPIPEs! */
1124         signal(SIGPIPE, SIG_IGN);
1125
1126         // We inconsistently handle a case when more POSTDATA from network
1127         // is coming than we expected. We may give *some part* of that
1128         // extra data to CGI.
1129
1130         //if (hdr_cnt > post_len) {
1131         //      /* We got more POSTDATA from network than we expected */
1132         //      hdr_cnt = post_len;
1133         //}
1134         post_len -= hdr_cnt;
1135         /* post_len - number of POST bytes not yet read from network */
1136
1137         /* NB: breaking out of this loop jumps to log_and_exit() */
1138         out_cnt = 0;
1139         while (1) {
1140                 memset(pfd, 0, sizeof(pfd));
1141
1142                 pfd[FROM_CGI].fd = fromCgi_rd;
1143                 pfd[FROM_CGI].events = POLLIN;
1144
1145                 if (toCgi_wr) {
1146                         pfd[TO_CGI].fd = toCgi_wr;
1147                         if (hdr_cnt > 0) {
1148                                 pfd[TO_CGI].events = POLLOUT;
1149                         } else if (post_len > 0) {
1150                                 pfd[0].events = POLLIN;
1151                         } else {
1152                                 /* post_len <= 0 && hdr_cnt <= 0:
1153                                  * no more POST data to CGI,
1154                                  * let CGI see EOF on CGI's stdin */
1155                                 close(toCgi_wr);
1156                                 toCgi_wr = 0;
1157                         }
1158                 }
1159
1160                 /* Now wait on the set of sockets */
1161                 count = safe_poll(pfd, 3, -1);
1162                 if (count <= 0) {
1163 #if 0
1164                         if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
1165                                 /* Weird. CGI didn't exit and no fd's
1166                                  * are ready, yet poll returned?! */
1167                                 continue;
1168                         }
1169                         if (DEBUG && WIFEXITED(status))
1170                                 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1171                         if (DEBUG && WIFSIGNALED(status))
1172                                 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1173 #endif
1174                         break;
1175                 }
1176
1177                 if (pfd[TO_CGI].revents) {
1178                         /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1179                         /* Have data from peer and can write to CGI */
1180                         count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1181                         /* Doesn't happen, we dont use nonblocking IO here
1182                          *if (count < 0 && errno == EAGAIN) {
1183                          *      ...
1184                          *} else */
1185                         if (count > 0) {
1186                                 hdr_ptr += count;
1187                                 hdr_cnt -= count;
1188                         } else {
1189                                 /* EOF/broken pipe to CGI, stop piping POST data */
1190                                 hdr_cnt = post_len = 0;
1191                         }
1192                 }
1193
1194                 if (pfd[0].revents) {
1195                         /* post_len > 0 && hdr_cnt == 0 here */
1196                         /* We expect data, prev data portion is eaten by CGI
1197                          * and there *is* data to read from the peer
1198                          * (POSTDATA) */
1199                         //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1200                         //count = safe_read(STDIN_FILENO, hdr_buf, count);
1201                         count = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1202                         if (count > 0) {
1203                                 hdr_cnt = count;
1204                                 hdr_ptr = hdr_buf;
1205                                 post_len -= count;
1206                         } else {
1207                                 /* no more POST data can be read */
1208                                 post_len = 0;
1209                         }
1210                 }
1211
1212                 if (pfd[FROM_CGI].revents) {
1213                         /* There is something to read from CGI */
1214                         char *rbuf = iobuf;
1215
1216                         /* Are we still buffering CGI output? */
1217                         if (out_cnt >= 0) {
1218                                 /* HTTP_200[] has single "\r\n" at the end.
1219                                  * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1220                                  * CGI scripts MUST send their own header terminated by
1221                                  * empty line, then data. That's why we have only one
1222                                  * <cr><lf> pair here. We will output "200 OK" line
1223                                  * if needed, but CGI still has to provide blank line
1224                                  * between header and body */
1225
1226                                 /* Must use safe_read, not full_read, because
1227                                  * CGI may output a few first bytes and then wait
1228                                  * for POSTDATA without closing stdout.
1229                                  * With full_read we may wait here forever. */
1230                                 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1231                                 if (count <= 0) {
1232                                         /* eof (or error) and there was no "HTTP",
1233                                          * so write it, then write received data */
1234                                         if (out_cnt) {
1235                                                 full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
1236                                                 full_write(STDOUT_FILENO, rbuf, out_cnt);
1237                                         }
1238                                         break; /* CGI stdout is closed, exiting */
1239                                 }
1240                                 out_cnt += count;
1241                                 count = 0;
1242                                 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1243                                 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1244                                         /* send "HTTP/1.0 " */
1245                                         if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9)
1246                                                 break;
1247                                         rbuf += 8; /* skip "Status: " */
1248                                         count = out_cnt - 8;
1249                                         out_cnt = -1; /* buffering off */
1250                                 } else if (out_cnt >= 4) {
1251                                         /* Did CGI add "HTTP"? */
1252                                         if (memcmp(rbuf, HTTP_200, 4) != 0) {
1253                                                 /* there is no "HTTP", do it ourself */
1254                                                 if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1255                                                         break;
1256                                         }
1257                                         /* Commented out:
1258                                         if (!strstr(rbuf, "ontent-")) {
1259                                                 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1260                                         }
1261                                          * Counter-example of valid CGI without Content-type:
1262                                          * echo -en "HTTP/1.0 302 Found\r\n"
1263                                          * echo -en "Location: http://www.busybox.net\r\n"
1264                                          * echo -en "\r\n"
1265                                          */
1266                                         count = out_cnt;
1267                                         out_cnt = -1; /* buffering off */
1268                                 }
1269                         } else {
1270                                 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1271                                 if (count <= 0)
1272                                         break;  /* eof (or error) */
1273                         }
1274                         if (full_write(STDOUT_FILENO, rbuf, count) != count)
1275                                 break;
1276                         if (DEBUG)
1277                                 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1278                 } /* if (pfd[FROM_CGI].revents) */
1279         } /* while (1) */
1280         log_and_exit();
1281 }
1282 #endif
1283
1284 #if ENABLE_FEATURE_HTTPD_CGI
1285
1286 static void setenv1(const char *name, const char *value)
1287 {
1288         setenv(name, value ? value : "", 1);
1289 }
1290
1291 /*
1292  * Spawn CGI script, forward CGI's stdin/out <=> network
1293  *
1294  * Environment variables are set up and the script is invoked with pipes
1295  * for stdin/stdout.  If a POST is being done the script is fed the POST
1296  * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1297  *
1298  * Parameters:
1299  * const char *url              The requested URL (with leading /).
1300  * int post_len                 Length of the POST body.
1301  * const char *cookie           For set HTTP_COOKIE.
1302  * const char *content_type     For set CONTENT_TYPE.
1303  */
1304 static void send_cgi_and_exit(
1305                 const char *url,
1306                 const char *request,
1307                 int post_len,
1308                 const char *cookie,
1309                 const char *content_type) NORETURN;
1310 static void send_cgi_and_exit(
1311                 const char *url,
1312                 const char *request,
1313                 int post_len,
1314                 const char *cookie,
1315                 const char *content_type)
1316 {
1317         struct fd_pair fromCgi;  /* CGI -> httpd pipe */
1318         struct fd_pair toCgi;    /* httpd -> CGI pipe */
1319         char *script;
1320         int pid;
1321
1322         /* Make a copy. NB: caller guarantees:
1323          * url[0] == '/', url[1] != '/' */
1324         url = xstrdup(url);
1325
1326         /*
1327          * We are mucking with environment _first_ and then vfork/exec,
1328          * this allows us to use vfork safely. Parent doesn't care about
1329          * these environment changes anyway.
1330          */
1331
1332         /* Check for [dirs/]script.cgi/PATH_INFO */
1333         script = (char*)url;
1334         while ((script = strchr(script + 1, '/')) != NULL) {
1335                 struct stat sb;
1336
1337                 *script = '\0';
1338                 if (!is_directory(url + 1, 1, &sb)) {
1339                         /* not directory, found script.cgi/PATH_INFO */
1340                         *script = '/';
1341                         break;
1342                 }
1343                 *script = '/'; /* is directory, find next '/' */
1344         }
1345         setenv1("PATH_INFO", script);   /* set to /PATH_INFO or "" */
1346         setenv1("REQUEST_METHOD", request);
1347         if (g_query) {
1348                 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", url, g_query));
1349         } else {
1350                 setenv1("REQUEST_URI", url);
1351         }
1352         if (script != NULL)
1353                 *script = '\0';         /* cut off /PATH_INFO */
1354
1355         /* SCRIPT_FILENAME is required by PHP in CGI mode */
1356         if (home_httpd[0] == '/') {
1357                 char *fullpath = concat_path_file(home_httpd, url);
1358                 setenv1("SCRIPT_FILENAME", fullpath);
1359         }
1360         /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1361         setenv1("SCRIPT_NAME", url);
1362         /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1363          * QUERY_STRING: The information which follows the ? in the URL
1364          * which referenced this script. This is the query information.
1365          * It should not be decoded in any fashion. This variable
1366          * should always be set when there is query information,
1367          * regardless of command line decoding. */
1368         /* (Older versions of bbox seem to do some decoding) */
1369         setenv1("QUERY_STRING", g_query);
1370         putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1371         putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1372         putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1373         /* Having _separate_ variables for IP and port defeats
1374          * the purpose of having socket abstraction. Which "port"
1375          * are you using on Unix domain socket?
1376          * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1377          * Oh well... */
1378         {
1379                 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1380                 char *cp = strrchr(p, ':');
1381                 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1382                         cp = NULL;
1383                 if (cp) *cp = '\0'; /* delete :PORT */
1384                 setenv1("REMOTE_ADDR", p);
1385                 if (cp) {
1386                         *cp = ':';
1387 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1388                         setenv1("REMOTE_PORT", cp + 1);
1389 #endif
1390                 }
1391         }
1392         setenv1("HTTP_USER_AGENT", user_agent);
1393         if (http_accept)
1394                 setenv1("HTTP_ACCEPT", http_accept);
1395         if (http_accept_language)
1396                 setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language);
1397         if (post_len)
1398                 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1399         if (cookie)
1400                 setenv1("HTTP_COOKIE", cookie);
1401         if (content_type)
1402                 setenv1("CONTENT_TYPE", content_type);
1403 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1404         if (remoteuser) {
1405                 setenv1("REMOTE_USER", remoteuser);
1406                 putenv((char*)"AUTH_TYPE=Basic");
1407         }
1408 #endif
1409         if (referer)
1410                 setenv1("HTTP_REFERER", referer);
1411         setenv1("HTTP_HOST", host); /* set to "" if NULL */
1412
1413         xpiped_pair(fromCgi);
1414         xpiped_pair(toCgi);
1415
1416         pid = vfork();
1417         if (pid < 0) {
1418                 /* TODO: log perror? */
1419                 log_and_exit();
1420         }
1421
1422         if (!pid) {
1423                 /* Child process */
1424                 char *argv[3];
1425
1426                 xfunc_error_retval = 242;
1427
1428                 /* NB: close _first_, then move fds! */
1429                 close(toCgi.wr);
1430                 close(fromCgi.rd);
1431                 xmove_fd(toCgi.rd, 0);  /* replace stdin with the pipe */
1432                 xmove_fd(fromCgi.wr, 1);  /* replace stdout with the pipe */
1433                 /* User seeing stderr output can be a security problem.
1434                  * If CGI really wants that, it can always do dup itself. */
1435                 /* dup2(1, 2); */
1436
1437                 /* Chdiring to script's dir */
1438                 script = strrchr(url, '/');
1439                 if (script != url) { /* paranoia */
1440                         *script = '\0';
1441                         if (chdir(url + 1) != 0) {
1442                                 bb_perror_msg("chdir %s", url + 1);
1443                                 goto error_execing_cgi;
1444                         }
1445                         // not needed: *script = '/';
1446                 }
1447                 script++;
1448
1449                 /* set argv[0] to name without path */
1450                 argv[0] = script;
1451                 argv[1] = NULL;
1452
1453 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1454                 {
1455                         char *suffix = strrchr(script, '.');
1456
1457                         if (suffix) {
1458                                 Htaccess *cur;
1459                                 for (cur = script_i; cur; cur = cur->next) {
1460                                         if (strcmp(cur->before_colon + 1, suffix) == 0) {
1461                                                 /* found interpreter name */
1462                                                 argv[0] = cur->after_colon;
1463                                                 argv[1] = script;
1464                                                 argv[2] = NULL;
1465                                                 break;
1466                                         }
1467                                 }
1468                         }
1469                 }
1470 #endif
1471                 /* restore default signal dispositions for CGI process */
1472                 bb_signals(0
1473                         | (1 << SIGCHLD)
1474                         | (1 << SIGPIPE)
1475                         | (1 << SIGHUP)
1476                         , SIG_DFL);
1477
1478                 /* _NOT_ execvp. We do not search PATH. argv[0] is a filename
1479                  * without any dir components and will only match a file
1480                  * in the current directory */
1481                 execv(argv[0], argv);
1482                 if (verbose)
1483                         bb_perror_msg("exec %s", argv[0]);
1484  error_execing_cgi:
1485                 /* send to stdout
1486                  * (we are CGI here, our stdout is pumped to the net) */
1487                 send_headers_and_exit(HTTP_NOT_FOUND);
1488         } /* end child */
1489
1490         /* Parent process */
1491
1492         /* Restore variables possibly changed by child */
1493         xfunc_error_retval = 0;
1494
1495         /* Pump data */
1496         close(fromCgi.wr);
1497         close(toCgi.rd);
1498         cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1499 }
1500
1501 #endif          /* FEATURE_HTTPD_CGI */
1502
1503 /*
1504  * Send a file response to a HTTP request, and exit
1505  *
1506  * Parameters:
1507  * const char *url  The requested URL (with leading /).
1508  * what             What to send (headers/body/both).
1509  */
1510 static void send_file_and_exit(const char *url, int what)
1511 {
1512         static const char *const suffixTable[] = {
1513         /* Warning: shorter equivalent suffix in one line must be first */
1514                 ".htm.html", "text/html",
1515                 ".jpg.jpeg", "image/jpeg",
1516                 ".gif",      "image/gif",
1517                 ".png",      "image/png",
1518                 ".txt.h.c.cc.cpp", "text/plain",
1519                 ".css",      "text/css",
1520                 ".wav",      "audio/wav",
1521                 ".avi",      "video/x-msvideo",
1522                 ".qt.mov",   "video/quicktime",
1523                 ".mpe.mpeg", "video/mpeg",
1524                 ".mid.midi", "audio/midi",
1525                 ".mp3",      "audio/mpeg",
1526 #if 0                        /* unpopular */
1527                 ".au",       "audio/basic",
1528                 ".pac",      "application/x-ns-proxy-autoconfig",
1529                 ".vrml.wrl", "model/vrml",
1530 #endif
1531                 NULL
1532         };
1533
1534         char *suffix;
1535         int f;
1536         const char *const *table;
1537         const char *try_suffix;
1538         ssize_t count;
1539 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1540         off_t offset;
1541 #endif
1542
1543         /* If you want to know about EPIPE below
1544          * (happens if you abort downloads from local httpd): */
1545         signal(SIGPIPE, SIG_IGN);
1546
1547         suffix = strrchr(url, '.');
1548
1549         /* If not found, set default as "application/octet-stream";  */
1550         found_mime_type = "application/octet-stream";
1551         if (suffix) {
1552 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1553                 Htaccess *cur;
1554 #endif
1555                 for (table = suffixTable; *table; table += 2) {
1556                         try_suffix = strstr(table[0], suffix);
1557                         if (try_suffix) {
1558                                 try_suffix += strlen(suffix);
1559                                 if (*try_suffix == '\0' || *try_suffix == '.') {
1560                                         found_mime_type = table[1];
1561                                         break;
1562                                 }
1563                         }
1564                 }
1565 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1566                 for (cur = mime_a; cur; cur = cur->next) {
1567                         if (strcmp(cur->before_colon, suffix) == 0) {
1568                                 found_mime_type = cur->after_colon;
1569                                 break;
1570                         }
1571                 }
1572 #endif
1573         }
1574
1575         if (DEBUG)
1576                 bb_error_msg("sending file '%s' content-type: %s",
1577                         url, found_mime_type);
1578
1579         f = open(url, O_RDONLY);
1580         if (f < 0) {
1581                 if (DEBUG)
1582                         bb_perror_msg("can't open '%s'", url);
1583                 /* Error pages are sent by using send_file_and_exit(SEND_BODY).
1584                  * IOW: it is unsafe to call send_headers_and_exit
1585                  * if what is SEND_BODY! Can recurse! */
1586                 if (what != SEND_BODY)
1587                         send_headers_and_exit(HTTP_NOT_FOUND);
1588                 log_and_exit();
1589         }
1590 #if ENABLE_FEATURE_HTTPD_RANGES
1591         if (what == SEND_BODY)
1592                 range_start = 0; /* err pages and ranges don't mix */
1593         range_len = MAXINT(off_t);
1594         if (range_start) {
1595                 if (!range_end) {
1596                         range_end = file_size - 1;
1597                 }
1598                 if (range_end < range_start
1599                  || lseek(f, range_start, SEEK_SET) != range_start
1600                 ) {
1601                         lseek(f, 0, SEEK_SET);
1602                         range_start = 0;
1603                 } else {
1604                         range_len = range_end - range_start + 1;
1605                         send_headers(HTTP_PARTIAL_CONTENT);
1606                         what = SEND_BODY;
1607                 }
1608         }
1609 #endif
1610
1611         if (what & SEND_HEADERS)
1612                 send_headers(HTTP_OK);
1613
1614 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1615         offset = range_start;
1616         do {
1617                 /* sz is rounded down to 64k */
1618                 ssize_t sz = MAXINT(ssize_t) - 0xffff;
1619                 USE_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1620                 count = sendfile(1, f, &offset, sz);
1621                 if (count < 0) {
1622                         if (offset == range_start)
1623                                 goto fallback;
1624                         goto fin;
1625                 }
1626                 USE_FEATURE_HTTPD_RANGES(range_len -= sz;)
1627         } while (count > 0 && range_len);
1628         log_and_exit();
1629
1630  fallback:
1631 #endif
1632         while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) {
1633                 ssize_t n;
1634                 USE_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1635                 n = full_write(STDOUT_FILENO, iobuf, count);
1636                 if (count != n)
1637                         break;
1638                 USE_FEATURE_HTTPD_RANGES(range_len -= count;)
1639                 if (!range_len)
1640                         break;
1641         }
1642 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1643  fin:
1644 #endif
1645         if (count < 0 && verbose > 1)
1646                 bb_perror_msg("error");
1647         log_and_exit();
1648 }
1649
1650 static int checkPermIP(void)
1651 {
1652         Htaccess_IP *cur;
1653
1654         for (cur = ip_a_d; cur; cur = cur->next) {
1655 #if DEBUG
1656                 fprintf(stderr,
1657                         "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1658                         rmt_ip_str,
1659                         (unsigned char)(cur->ip >> 24),
1660                         (unsigned char)(cur->ip >> 16),
1661                         (unsigned char)(cur->ip >> 8),
1662                         (unsigned char)(cur->ip),
1663                         (unsigned char)(cur->mask >> 24),
1664                         (unsigned char)(cur->mask >> 16),
1665                         (unsigned char)(cur->mask >> 8),
1666                         (unsigned char)(cur->mask)
1667                 );
1668 #endif
1669                 if ((rmt_ip & cur->mask) == cur->ip)
1670                         return (cur->allow_deny == 'A'); /* A -> 1 */
1671         }
1672
1673         return !flg_deny_all; /* depends on whether we saw "D:*" */
1674 }
1675
1676 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1677 /*
1678  * Config file entries are of the form "/<path>:<user>:<passwd>".
1679  * If config file has no prefix match for path, access is allowed.
1680  *
1681  * path                 The file path
1682  * user_and_passwd      "user:passwd" to validate
1683  *
1684  * Returns 1 if user_and_passwd is OK.
1685  */
1686 static int check_user_passwd(const char *path, const char *user_and_passwd)
1687 {
1688         Htaccess *cur;
1689         const char *prev = NULL;
1690
1691         for (cur = g_auth; cur; cur = cur->next) {
1692                 const char *dir_prefix;
1693                 size_t len;
1694
1695                 dir_prefix = cur->before_colon;
1696
1697                 /* WHY? */
1698                 /* If already saw a match, don't accept other different matches */
1699                 if (prev && strcmp(prev, dir_prefix) != 0)
1700                         continue;
1701
1702                 if (DEBUG)
1703                         fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
1704
1705                 /* If it's not a prefix match, continue searching */
1706                 len = strlen(dir_prefix);
1707                 if (len != 1 /* dir_prefix "/" matches all, don't need to check */
1708                  && (strncmp(dir_prefix, path, len) != 0
1709                     || (path[len] != '/' && path[len] != '\0'))
1710                 ) {
1711                         continue;
1712                 }
1713
1714                 /* Path match found */
1715                 prev = dir_prefix;
1716
1717                 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1718                         char *md5_passwd;
1719
1720                         md5_passwd = strchr(cur->after_colon, ':');
1721                         if (md5_passwd && md5_passwd[1] == '$' && md5_passwd[2] == '1'
1722                          && md5_passwd[3] == '$' && md5_passwd[4]
1723                         ) {
1724                                 char *encrypted;
1725                                 int r, user_len_p1;
1726
1727                                 md5_passwd++;
1728                                 user_len_p1 = md5_passwd - cur->after_colon;
1729                                 /* comparing "user:" */
1730                                 if (strncmp(cur->after_colon, user_and_passwd, user_len_p1) != 0) {
1731                                         continue;
1732                                 }
1733
1734                                 encrypted = pw_encrypt(
1735                                         user_and_passwd + user_len_p1 /* cleartext pwd from user */,
1736                                         md5_passwd /*salt */, 1 /* cleanup */);
1737                                 r = strcmp(encrypted, md5_passwd);
1738                                 free(encrypted);
1739                                 if (r == 0)
1740                                         goto set_remoteuser_var; /* Ok */
1741                                 continue;
1742                         }
1743                 }
1744
1745                 /* Comparing plaintext "user:pass" in one go */
1746                 if (strcmp(cur->after_colon, user_and_passwd) == 0) {
1747  set_remoteuser_var:
1748                         remoteuser = xstrndup(user_and_passwd,
1749                                         strchrnul(user_and_passwd, ':') - user_and_passwd);
1750                         return 1; /* Ok */
1751                 }
1752         } /* for */
1753
1754         /* 0(bad) if prev is set: matches were found but passwd was wrong */
1755         return (prev == NULL);
1756 }
1757 #endif  /* FEATURE_HTTPD_BASIC_AUTH */
1758
1759 #if ENABLE_FEATURE_HTTPD_PROXY
1760 static Htaccess_Proxy *find_proxy_entry(const char *url)
1761 {
1762         Htaccess_Proxy *p;
1763         for (p = proxy; p; p = p->next) {
1764                 if (strncmp(url, p->url_from, strlen(p->url_from)) == 0)
1765                         return p;
1766         }
1767         return NULL;
1768 }
1769 #endif
1770
1771 /*
1772  * Handle timeouts
1773  */
1774 static void exit_on_signal(int sig) NORETURN;
1775 static void exit_on_signal(int sig UNUSED_PARAM)
1776 {
1777         send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1778 }
1779
1780 /*
1781  * Handle an incoming http request and exit.
1782  */
1783 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN;
1784 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1785 {
1786         static const char request_GET[] ALIGN1 = "GET";
1787         struct stat sb;
1788         char *urlcopy;
1789         char *urlp;
1790         char *tptr;
1791 #if ENABLE_FEATURE_HTTPD_CGI
1792         static const char request_HEAD[] ALIGN1 = "HEAD";
1793         const char *prequest;
1794         char *cookie = NULL;
1795         char *content_type = NULL;
1796         unsigned long length = 0;
1797 #elif ENABLE_FEATURE_HTTPD_PROXY
1798 #define prequest request_GET
1799         unsigned long length = 0;
1800 #endif
1801 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1802         smallint authorized = -1;
1803 #endif
1804         smallint ip_allowed;
1805         char http_major_version;
1806 #if ENABLE_FEATURE_HTTPD_PROXY
1807         char http_minor_version;
1808         char *header_buf = header_buf; /* for gcc */
1809         char *header_ptr = header_ptr;
1810         Htaccess_Proxy *proxy_entry;
1811 #endif
1812
1813         /* Allocation of iobuf is postponed until now
1814          * (IOW, server process doesn't need to waste 8k) */
1815         iobuf = xmalloc(IOBUF_SIZE);
1816
1817         rmt_ip = 0;
1818         if (fromAddr->u.sa.sa_family == AF_INET) {
1819                 rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
1820         }
1821 #if ENABLE_FEATURE_IPV6
1822         if (fromAddr->u.sa.sa_family == AF_INET6
1823          && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0
1824          && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0
1825          && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1826                 rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]);
1827 #endif
1828         if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1829                 /* NB: can be NULL (user runs httpd -i by hand?) */
1830                 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa);
1831         }
1832         if (verbose) {
1833                 /* this trick makes -v logging much simpler */
1834                 if (rmt_ip_str)
1835                         applet_name = rmt_ip_str;
1836                 if (verbose > 2)
1837                         bb_error_msg("connected");
1838         }
1839
1840         /* Install timeout handler */
1841         signal_no_SA_RESTART_empty_mask(SIGALRM, exit_on_signal);
1842         alarm(HEADER_READ_TIMEOUT);
1843
1844         if (!get_line()) /* EOF or error or empty line */
1845                 send_headers_and_exit(HTTP_BAD_REQUEST);
1846
1847         /* Determine type of request (GET/POST) */
1848         urlp = strpbrk(iobuf, " \t");
1849         if (urlp == NULL)
1850                 send_headers_and_exit(HTTP_BAD_REQUEST);
1851         *urlp++ = '\0';
1852 #if ENABLE_FEATURE_HTTPD_CGI
1853         prequest = request_GET;
1854         if (strcasecmp(iobuf, prequest) != 0) {
1855                 prequest = request_HEAD;
1856                 if (strcasecmp(iobuf, prequest) != 0) {
1857                         prequest = "POST";
1858                         if (strcasecmp(iobuf, prequest) != 0)
1859                                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1860                 }
1861         }
1862 #else
1863         if (strcasecmp(iobuf, request_GET) != 0)
1864                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1865 #endif
1866         urlp = skip_whitespace(urlp);
1867         if (urlp[0] != '/')
1868                 send_headers_and_exit(HTTP_BAD_REQUEST);
1869
1870         /* Find end of URL and parse HTTP version, if any */
1871         http_major_version = '0';
1872         USE_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
1873         tptr = strchrnul(urlp, ' ');
1874         /* Is it " HTTP/"? */
1875         if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
1876                 http_major_version = tptr[6];
1877                 USE_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
1878         }
1879         *tptr = '\0';
1880
1881         /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1882         urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page));
1883         /*if (urlcopy == NULL)
1884          *      send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1885         strcpy(urlcopy, urlp);
1886         /* NB: urlcopy ptr is never changed after this */
1887
1888         /* Extract url args if present */
1889         g_query = NULL;
1890         tptr = strchr(urlcopy, '?');
1891         if (tptr) {
1892                 *tptr++ = '\0';
1893                 g_query = tptr;
1894         }
1895
1896         /* Decode URL escape sequences */
1897         tptr = decodeString(urlcopy, 0);
1898         if (tptr == NULL)
1899                 send_headers_and_exit(HTTP_BAD_REQUEST);
1900         if (tptr == urlcopy + 1) {
1901                 /* '/' or NUL is encoded */
1902                 send_headers_and_exit(HTTP_NOT_FOUND);
1903         }
1904
1905         /* Canonicalize path */
1906         /* Algorithm stolen from libbb bb_simplify_path(),
1907          * but don't strdup, retain trailing slash, protect root */
1908         urlp = tptr = urlcopy;
1909         do {
1910                 if (*urlp == '/') {
1911                         /* skip duplicate (or initial) slash */
1912                         if (*tptr == '/') {
1913                                 continue;
1914                         }
1915                         if (*tptr == '.') {
1916                                 /* skip extra "/./" */
1917                                 if (tptr[1] == '/' || !tptr[1]) {
1918                                         continue;
1919                                 }
1920                                 /* "..": be careful */
1921                                 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1922                                         ++tptr;
1923                                         if (urlp == urlcopy) /* protect root */
1924                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1925                                         while (*--urlp != '/') /* omit previous dir */;
1926                                                 continue;
1927                                 }
1928                         }
1929                 }
1930                 *++urlp = *tptr;
1931         } while (*++tptr);
1932         *++urlp = '\0';       /* terminate after last character */
1933
1934         /* If URL is a directory, add '/' */
1935         if (urlp[-1] != '/') {
1936                 if (is_directory(urlcopy + 1, 1, &sb)) {
1937                         found_moved_temporarily = urlcopy;
1938                 }
1939         }
1940
1941         /* Log it */
1942         if (verbose > 1)
1943                 bb_error_msg("url:%s", urlcopy);
1944
1945         tptr = urlcopy;
1946         ip_allowed = checkPermIP();
1947         while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1948                 /* have path1/path2 */
1949                 *tptr = '\0';
1950                 if (is_directory(urlcopy + 1, 1, &sb)) {
1951                         /* may have subdir config */
1952                         parse_conf(urlcopy + 1, SUBDIR_PARSE);
1953                         ip_allowed = checkPermIP();
1954                 }
1955                 *tptr = '/';
1956         }
1957
1958 #if ENABLE_FEATURE_HTTPD_PROXY
1959         proxy_entry = find_proxy_entry(urlcopy);
1960         if (proxy_entry)
1961                 header_buf = header_ptr = xmalloc(IOBUF_SIZE);
1962 #endif
1963
1964         if (http_major_version >= '0') {
1965                 /* Request was with "... HTTP/nXXX", and n >= 0 */
1966
1967                 /* Read until blank line for HTTP version specified, else parse immediate */
1968                 while (1) {
1969                         alarm(HEADER_READ_TIMEOUT);
1970                         if (!get_line())
1971                                 break; /* EOF or error or empty line */
1972                         if (DEBUG)
1973                                 bb_error_msg("header: '%s'", iobuf);
1974
1975 #if ENABLE_FEATURE_HTTPD_PROXY
1976                         /* We need 2 more bytes for yet another "\r\n" -
1977                          * see near fdprintf(proxy_fd...) further below */
1978                         if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) {
1979                                 int len = strlen(iobuf);
1980                                 if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4)
1981                                         len = IOBUF_SIZE - (header_ptr - header_buf) - 4;
1982                                 memcpy(header_ptr, iobuf, len);
1983                                 header_ptr += len;
1984                                 header_ptr[0] = '\r';
1985                                 header_ptr[1] = '\n';
1986                                 header_ptr += 2;
1987                         }
1988 #endif
1989
1990 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1991                         /* Try and do our best to parse more lines */
1992                         if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
1993                                 /* extra read only for POST */
1994                                 if (prequest != request_GET
1995 #if ENABLE_FEATURE_HTTPD_CGI
1996                                  && prequest != request_HEAD
1997 #endif
1998                                 ) {
1999                                         tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1);
2000                                         if (!tptr[0])
2001                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
2002                                         /* not using strtoul: it ignores leading minus! */
2003                                         length = bb_strtou(tptr, NULL, 10);
2004                                         /* length is "ulong", but we need to pass it to int later */
2005                                         if (errno || length > INT_MAX)
2006                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
2007                                 }
2008                         }
2009 #endif
2010 #if ENABLE_FEATURE_HTTPD_CGI
2011                         else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
2012                                 cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
2013                         } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
2014                                 content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
2015                         } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
2016                                 referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
2017                         } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
2018                                 user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
2019                         } else if (STRNCASECMP(iobuf, "Host:") == 0) {
2020                                 host = xstrdup(skip_whitespace(iobuf + sizeof("Host:")-1));
2021                         } else if (STRNCASECMP(iobuf, "Accept:") == 0) {
2022                                 http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1));
2023                         } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) {
2024                                 http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1));
2025                         }
2026 #endif
2027 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2028                         if (STRNCASECMP(iobuf, "Authorization:") == 0) {
2029                                 /* We only allow Basic credentials.
2030                                  * It shows up as "Authorization: Basic <user>:<passwd>" where
2031                                  * "<user>:<passwd>" is base64 encoded.
2032                                  */
2033                                 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
2034                                 if (STRNCASECMP(tptr, "Basic") != 0)
2035                                         continue;
2036                                 tptr += sizeof("Basic")-1;
2037                                 /* decodeBase64() skips whitespace itself */
2038                                 decodeBase64(tptr);
2039                                 authorized = check_user_passwd(urlcopy, tptr);
2040                         }
2041 #endif
2042 #if ENABLE_FEATURE_HTTPD_RANGES
2043                         if (STRNCASECMP(iobuf, "Range:") == 0) {
2044                                 /* We know only bytes=NNN-[MMM] */
2045                                 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
2046                                 if (strncmp(s, "bytes=", 6) == 0) {
2047                                         s += sizeof("bytes=")-1;
2048                                         range_start = BB_STRTOOFF(s, &s, 10);
2049                                         if (s[0] != '-' || range_start < 0) {
2050                                                 range_start = 0;
2051                                         } else if (s[1]) {
2052                                                 range_end = BB_STRTOOFF(s+1, NULL, 10);
2053                                                 if (errno || range_end < range_start)
2054                                                         range_start = 0;
2055                                         }
2056                                 }
2057                         }
2058 #endif
2059                 } /* while extra header reading */
2060         }
2061
2062         /* We are done reading headers, disable peer timeout */
2063         alarm(0);
2064
2065         if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || !ip_allowed) {
2066                 /* protect listing [/path]/httpd_conf or IP deny */
2067                 send_headers_and_exit(HTTP_FORBIDDEN);
2068         }
2069
2070 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2071         /* Case: no "Authorization:" was seen, but page does require passwd.
2072          * Check that with dummy user:pass */
2073         if (authorized < 0)
2074                 authorized = check_user_passwd(urlcopy, ":");
2075         if (!authorized)
2076                 send_headers_and_exit(HTTP_UNAUTHORIZED);
2077 #endif
2078
2079         if (found_moved_temporarily) {
2080                 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2081         }
2082
2083 #if ENABLE_FEATURE_HTTPD_PROXY
2084         if (proxy_entry != NULL) {
2085                 int proxy_fd;
2086                 len_and_sockaddr *lsa;
2087
2088                 proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
2089                 if (proxy_fd < 0)
2090                         send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2091                 lsa = host2sockaddr(proxy_entry->host_port, 80);
2092                 if (lsa == NULL)
2093                         send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2094                 if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0)
2095                         send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2096                 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
2097                                 prequest, /* GET or POST */
2098                                 proxy_entry->url_to, /* url part 1 */
2099                                 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
2100                                 (g_query ? "?" : ""), /* "?" (maybe) */
2101                                 (g_query ? g_query : ""), /* query string (maybe) */
2102                                 http_major_version, http_minor_version);
2103                 header_ptr[0] = '\r';
2104                 header_ptr[1] = '\n';
2105                 header_ptr += 2;
2106                 write(proxy_fd, header_buf, header_ptr - header_buf);
2107                 free(header_buf); /* on the order of 8k, free it */
2108                 /* cgi_io_loop_and_exit needs to have two disctinct fds */
2109                 cgi_io_loop_and_exit(proxy_fd, dup(proxy_fd), length);
2110         }
2111 #endif
2112
2113         tptr = urlcopy + 1;      /* skip first '/' */
2114
2115 #if ENABLE_FEATURE_HTTPD_CGI
2116         if (strncmp(tptr, "cgi-bin/", 8) == 0) {
2117                 if (tptr[8] == '\0') {
2118                         /* protect listing "cgi-bin/" */
2119                         send_headers_and_exit(HTTP_FORBIDDEN);
2120                 }
2121                 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2122         }
2123 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2124         {
2125                 char *suffix = strrchr(tptr, '.');
2126                 if (suffix) {
2127                         Htaccess *cur;
2128                         for (cur = script_i; cur; cur = cur->next) {
2129                                 if (strcmp(cur->before_colon + 1, suffix) == 0) {
2130                                         send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2131                                 }
2132                         }
2133                 }
2134         }
2135 #endif
2136         if (prequest != request_GET && prequest != request_HEAD) {
2137                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2138         }
2139 #endif  /* FEATURE_HTTPD_CGI */
2140
2141         if (urlp[-1] == '/')
2142                 strcpy(urlp, index_page);
2143         if (stat(tptr, &sb) == 0) {
2144                 file_size = sb.st_size;
2145                 last_mod = sb.st_mtime;
2146         }
2147 #if ENABLE_FEATURE_HTTPD_CGI
2148         else if (urlp[-1] == '/') {
2149                 /* It's a dir URL and there is no index.html
2150                  * Try cgi-bin/index.cgi */
2151                 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
2152                         urlp[0] = '\0';
2153                         g_query = urlcopy;
2154                         send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
2155                 }
2156         }
2157 #endif
2158         /* else {
2159          *      fall through to send_file, it errors out if open fails
2160          * }
2161          */
2162
2163         send_file_and_exit(tptr,
2164 #if ENABLE_FEATURE_HTTPD_CGI
2165                 (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
2166 #else
2167                 SEND_HEADERS_AND_BODY
2168 #endif
2169         );
2170 }
2171
2172 /*
2173  * The main http server function.
2174  * Given a socket, listen for new connections and farm out
2175  * the processing as a [v]forked process.
2176  * Never returns.
2177  */
2178 #if BB_MMU
2179 static void mini_httpd(int server_socket) NORETURN;
2180 static void mini_httpd(int server_socket)
2181 {
2182         /* NB: it's best to not use xfuncs in this loop before fork().
2183          * Otherwise server may die on transient errors (temporary
2184          * out-of-memory condition, etc), which is Bad(tm).
2185          * Try to do any dangerous calls after fork.
2186          */
2187         while (1) {
2188                 int n;
2189                 len_and_sockaddr fromAddr;
2190
2191                 /* Wait for connections... */
2192                 fromAddr.len = LSA_SIZEOF_SA;
2193                 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2194
2195                 if (n < 0)
2196                         continue;
2197                 /* set the KEEPALIVE option to cull dead connections */
2198                 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2199
2200                 if (fork() == 0) {
2201                         /* child */
2202 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2203                         /* Do not reload config on HUP */
2204                         signal(SIGHUP, SIG_IGN);
2205 #endif
2206                         close(server_socket);
2207                         xmove_fd(n, 0);
2208                         xdup2(0, 1);
2209
2210                         handle_incoming_and_exit(&fromAddr);
2211                 }
2212                 /* parent, or fork failed */
2213                 close(n);
2214         } /* while (1) */
2215         /* never reached */
2216 }
2217 #else
2218 static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN;
2219 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2220 {
2221         char *argv_copy[argc + 2];
2222
2223         argv_copy[0] = argv[0];
2224         argv_copy[1] = (char*)"-i";
2225         memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2226
2227         /* NB: it's best to not use xfuncs in this loop before vfork().
2228          * Otherwise server may die on transient errors (temporary
2229          * out-of-memory condition, etc), which is Bad(tm).
2230          * Try to do any dangerous calls after fork.
2231          */
2232         while (1) {
2233                 int n;
2234                 len_and_sockaddr fromAddr;
2235
2236                 /* Wait for connections... */
2237                 fromAddr.len = LSA_SIZEOF_SA;
2238                 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2239
2240                 if (n < 0)
2241                         continue;
2242                 /* set the KEEPALIVE option to cull dead connections */
2243                 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2244
2245                 if (vfork() == 0) {
2246                         /* child */
2247 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2248                         /* Do not reload config on HUP */
2249                         signal(SIGHUP, SIG_IGN);
2250 #endif
2251                         close(server_socket);
2252                         xmove_fd(n, 0);
2253                         xdup2(0, 1);
2254
2255                         /* Run a copy of ourself in inetd mode */
2256                         re_exec(argv_copy);
2257                 }
2258                 /* parent, or vfork failed */
2259                 close(n);
2260         } /* while (1) */
2261         /* never reached */
2262 }
2263 #endif
2264
2265 /*
2266  * Process a HTTP connection on stdin/out.
2267  * Never returns.
2268  */
2269 static void mini_httpd_inetd(void) NORETURN;
2270 static void mini_httpd_inetd(void)
2271 {
2272         len_and_sockaddr fromAddr;
2273
2274         memset(&fromAddr, 0, sizeof(fromAddr));
2275         fromAddr.len = LSA_SIZEOF_SA;
2276         /* NB: can fail if user runs it by hand and types in http cmds */
2277         getpeername(0, &fromAddr.u.sa, &fromAddr.len);
2278         handle_incoming_and_exit(&fromAddr);
2279 }
2280
2281 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2282 static void sighup_handler(int sig)
2283 {
2284         parse_conf(default_path_httpd_conf, sig ? SIGNALED_PARSE : FIRST_PARSE);
2285         signal_SA_RESTART_empty_mask(SIGHUP, sighup_handler);
2286 }
2287 #endif
2288
2289 enum {
2290         c_opt_config_file = 0,
2291         d_opt_decode_url,
2292         h_opt_home_httpd,
2293         USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2294         USE_FEATURE_HTTPD_BASIC_AUTH(    r_opt_realm     ,)
2295         USE_FEATURE_HTTPD_AUTH_MD5(      m_opt_md5       ,)
2296         USE_FEATURE_HTTPD_SETUID(        u_opt_setuid    ,)
2297         p_opt_port      ,
2298         p_opt_inetd     ,
2299         p_opt_foreground,
2300         p_opt_verbose   ,
2301         OPT_CONFIG_FILE = 1 << c_opt_config_file,
2302         OPT_DECODE_URL  = 1 << d_opt_decode_url,
2303         OPT_HOME_HTTPD  = 1 << h_opt_home_httpd,
2304         OPT_ENCODE_URL  = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2305         OPT_REALM       = USE_FEATURE_HTTPD_BASIC_AUTH(    (1 << r_opt_realm     )) + 0,
2306         OPT_MD5         = USE_FEATURE_HTTPD_AUTH_MD5(      (1 << m_opt_md5       )) + 0,
2307         OPT_SETUID      = USE_FEATURE_HTTPD_SETUID(        (1 << u_opt_setuid    )) + 0,
2308         OPT_PORT        = 1 << p_opt_port,
2309         OPT_INETD       = 1 << p_opt_inetd,
2310         OPT_FOREGROUND  = 1 << p_opt_foreground,
2311         OPT_VERBOSE     = 1 << p_opt_verbose,
2312 };
2313
2314
2315 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2316 int httpd_main(int argc UNUSED_PARAM, char **argv)
2317 {
2318         int server_socket = server_socket; /* for gcc */
2319         unsigned opt;
2320         char *url_for_decode;
2321         USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2322         USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2323         USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2324         USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2325
2326         INIT_G();
2327
2328 #if ENABLE_LOCALE_SUPPORT
2329         /* Undo busybox.c: we want to speak English in http (dates etc) */
2330         setlocale(LC_TIME, "C");
2331 #endif
2332
2333         home_httpd = xrealloc_getcwd_or_warn(NULL);
2334         /* -v counts, -i implies -f */
2335         opt_complementary = "vv:if";
2336         /* We do not "absolutize" path given by -h (home) opt.
2337          * If user gives relative path in -h,
2338          * $SCRIPT_FILENAME will not be set. */
2339         opt = getopt32(argv, "c:d:h:"
2340                         USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2341                         USE_FEATURE_HTTPD_BASIC_AUTH("r:")
2342                         USE_FEATURE_HTTPD_AUTH_MD5("m:")
2343                         USE_FEATURE_HTTPD_SETUID("u:")
2344                         "p:ifv",
2345                         &configFile, &url_for_decode, &home_httpd
2346                         USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2347                         USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2348                         USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
2349                         USE_FEATURE_HTTPD_SETUID(, &s_ugid)
2350                         , &bind_addr_or_port
2351                         , &verbose
2352                 );
2353         if (opt & OPT_DECODE_URL) {
2354                 fputs(decodeString(url_for_decode, 1), stdout);
2355                 return 0;
2356         }
2357 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2358         if (opt & OPT_ENCODE_URL) {
2359                 fputs(encodeString(url_for_encode), stdout);
2360                 return 0;
2361         }
2362 #endif
2363 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2364         if (opt & OPT_MD5) {
2365                 puts(pw_encrypt(pass, "$1$", 1));
2366                 return 0;
2367         }
2368 #endif
2369 #if ENABLE_FEATURE_HTTPD_SETUID
2370         if (opt & OPT_SETUID) {
2371                 xget_uidgid(&ugid, s_ugid);
2372         }
2373 #endif
2374
2375 #if !BB_MMU
2376         if (!(opt & OPT_FOREGROUND)) {
2377                 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2378         }
2379 #endif
2380
2381         xchdir(home_httpd);
2382         if (!(opt & OPT_INETD)) {
2383                 signal(SIGCHLD, SIG_IGN);
2384                 server_socket = openServer();
2385 #if ENABLE_FEATURE_HTTPD_SETUID
2386                 /* drop privileges */
2387                 if (opt & OPT_SETUID) {
2388                         if (ugid.gid != (gid_t)-1) {
2389                                 if (setgroups(1, &ugid.gid) == -1)
2390                                         bb_perror_msg_and_die("setgroups");
2391                                 xsetgid(ugid.gid);
2392                         }
2393                         xsetuid(ugid.uid);
2394                 }
2395 #endif
2396         }
2397
2398 #if 0 /*was #if ENABLE_FEATURE_HTTPD_CGI*/
2399         /* User can do it himself: 'env - PATH="$PATH" httpd'
2400          * We don't do it because we don't want to screw users
2401          * which want to do
2402          * 'env - VAR1=val1 VAR2=val2 httpd'
2403          * and have VAR1 and VAR2 values visible in their CGIs.
2404          * Besides, it is also smaller. */
2405         {
2406                 char *p = getenv("PATH");
2407                 /* env strings themself are not freed, no need to xstrdup(p): */
2408                 clearenv();
2409                 if (p)
2410                         putenv(p - 5);
2411 //              if (!(opt & OPT_INETD))
2412 //                      setenv_long("SERVER_PORT", ???);
2413         }
2414 #endif
2415
2416 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2417         if (!(opt & OPT_INETD)) {
2418                 /* runs parse_conf() inside */
2419                 sighup_handler(0);
2420         } else
2421 #endif
2422         {
2423                 parse_conf(default_path_httpd_conf, FIRST_PARSE);
2424         }
2425
2426         xfunc_error_retval = 0;
2427         if (opt & OPT_INETD)
2428                 mini_httpd_inetd();
2429 #if BB_MMU
2430         if (!(opt & OPT_FOREGROUND))
2431                 bb_daemonize(0); /* don't change current directory */
2432         mini_httpd(server_socket); /* never returns */
2433 #else
2434         mini_httpd_nommu(server_socket, argc, argv); /* never returns */
2435 #endif
2436         /* return 0; */
2437 }