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