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