networking/httpd.c

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