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