networking/httpd.c

   1 /* vi: set sw=4 ts=4: */
   2 /*
   3  * httpd implementation for busybox
   4  *
   5  * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org>
   6  * Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru>
   7  *
   8  * simplify patch stolen from libbb without using strdup
   9  *
  10  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  11  *
  12  *****************************************************************************
  13  *
  14  * Typical usage:
  15  *   for non root user
  16  * httpd -p 8080 -h $HOME/public_html
  17  *   or for daemon start from rc script with uid=0:
  18  * httpd -u www
  19  * This is equivalent if www user have uid=80 to
  20  * httpd -p 80 -u 80 -h /www -c /etc/httpd.conf -r "Web Server Authentication"
  21  *
  22  *
  23  * When a url starts by "/cgi-bin/" it is assumed to be a cgi script.  The
  24  * server changes directory to the location of the script and executes it
  25  * after setting QUERY_STRING and other environment variables.
  26  *
  27  * Doc:
  28  * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html
  29  *
  30  * The applet can also be invoked as a url arg decoder and html text encoder
  31  * as follows:
  32  *  foo=`httpd -d $foo`           # decode "Hello%20World" as "Hello World"
  33  *  bar=`httpd -e "<Hello World>"`  # encode as "&#60Hello&#32World&#62"
  34  * Note that url encoding for arguments is not the same as html encoding for
  35  * presentation.  -d decodes a url-encoded argument while -e encodes in html
  36  * for page display.
  37  *
  38  * httpd.conf has the following format:
  39  *
  40  * H:/serverroot     # define the server root. It will override -h
  41  * A:172.20.         # Allow address from 172.20.0.0/16
  42  * A:10.0.0.0/25     # Allow any address from 10.0.0.0-10.0.0.127
  43  * A:10.0.0.0/255.255.255.128  # Allow any address that previous set
  44  * A:127.0.0.1       # Allow local loopback connections
  45  * D:*               # Deny from other IP connections
  46  * E404:/path/e404.html # /path/e404.html is the 404 (not found) error page
  47  * I:index.html      # Show index.html when a directory is requested
  48  *
  49  * P:/url:[http://]hostname[:port]/new/path
  50  *                   # When /urlXXXXXX is requested, reverse proxy
  51  *                   # it to http://hostname[:port]/new/pathXXXXXX
  52  *
  53  * /cgi-bin:foo:bar  # Require user foo, pwd bar on urls starting with /cgi-bin/
  54  * /adm:admin:setup  # Require user admin, pwd setup on urls starting with /adm/
  55  * /adm:toor:PaSsWd  # or user toor, pwd PaSsWd on urls starting with /adm/
  56  * .au:audio/basic   # additional mime type for audio.au files
  57  * *.php:/path/php   # run xxx.php through an interpreter
  58  *
  59  * A/D may be as a/d or allow/deny - only first char matters.
  60  * Deny/Allow IP logic:
  61  *  - Default is to allow all (Allow all (A:*) is a no-op).
  62  *  - Deny rules take precedence over allow rules.
  63  *  - "Deny all" rule (D:*) is applied last.
  64  *
  65  * Example:
  66  *   1. Allow only specified addresses
  67  *     A:172.20          # Allow any address that begins with 172.20.
  68  *     A:10.10.          # Allow any address that begins with 10.10.
  69  *     A:127.0.0.1       # Allow local loopback connections
  70  *     D:*               # Deny from other IP connections
  71  *
  72  *   2. Only deny specified addresses
  73  *     D:1.2.3.        # deny from 1.2.3.0 - 1.2.3.255
  74  *     D:2.3.4.        # deny from 2.3.4.0 - 2.3.4.255
  75  *     A:*             # (optional line added for clarity)
  76  *
  77  * If a sub directory contains a config file it is parsed and merged with
  78  * any existing settings as if it was appended to the original configuration.
  79  *
  80  * subdir paths are relative to the containing subdir and thus cannot
  81  * affect the parent rules.
  82  *
  83  * Note that since the sub dir is parsed in the forked thread servicing the
  84  * subdir http request, any merge is discarded when the process exits.  As a
  85  * result, the subdir settings only have a lifetime of a single request.
  86  *
  87  * Custom error pages can contain an absolute path or be relative to
  88  * 'home_httpd'. Error pages are to be static files (no CGI or script). Error
  89  * page can only be defined in the root configuration file and are not taken
  90  * into account in local (directories) config files.
  91  *
  92  * If -c is not set, an attempt will be made to open the default
  93  * root configuration file.  If -c is set and the file is not found, the
  94  * server exits with an error.
  95  *
  96  */
  97
  98 #include "libbb.h"
  99 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
 100 # include <sys/sendfile.h>
 101 #endif
 102
 103 #define DEBUG 0
 104
 105 #define IOBUF_SIZE 8192    /* IO buffer */
 106
 107 /* amount of buffering in a pipe */
 108 #ifndef PIPE_BUF
 109 # define PIPE_BUF 4096
 110 #endif
 111 #if PIPE_BUF >= IOBUF_SIZE
 112 # error "PIPE_BUF >= IOBUF_SIZE"
 113 #endif
 114
 115 #define HEADER_READ_TIMEOUT 60
 116
 117 static const char DEFAULT_PATH_HTTPD_CONF[] ALIGN1 = "/etc";
 118 static const char HTTPD_CONF[] ALIGN1 = "httpd.conf";
 119 static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n";
 120
 121 typedef struct has_next_ptr {
 122         struct has_next_ptr *next;
 123 } has_next_ptr;
 124
 125 /* Must have "next" as a first member */
 126 typedef struct Htaccess {
 127         struct Htaccess *next;
 128         char *after_colon;
 129         char before_colon[1];  /* really bigger, must be last */
 130 } Htaccess;
 131
 132 /* Must have "next" as a first member */
 133 typedef struct Htaccess_IP {
 134         struct Htaccess_IP *next;
 135         unsigned ip;
 136         unsigned mask;
 137         int allow_deny;
 138 } Htaccess_IP;
 139
 140 /* Must have "next" as a first member */
 141 typedef struct Htaccess_Proxy {
 142         struct Htaccess_Proxy *next;
 143         char *url_from;
 144         char *host_port;
 145         char *url_to;
 146 } Htaccess_Proxy;
 147
 148 enum {
 149         HTTP_OK = 200,
 150         HTTP_PARTIAL_CONTENT = 206,
 151         HTTP_MOVED_TEMPORARILY = 302,
 152         HTTP_BAD_REQUEST = 400,       /* malformed syntax */
 153         HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
 154         HTTP_NOT_FOUND = 404,
 155         HTTP_FORBIDDEN = 403,
 156         HTTP_REQUEST_TIMEOUT = 408,
 157         HTTP_NOT_IMPLEMENTED = 501,   /* used for unrecognized requests */
 158         HTTP_INTERNAL_SERVER_ERROR = 500,
 159         HTTP_CONTINUE = 100,
 160 #if 0   /* future use */
 161         HTTP_SWITCHING_PROTOCOLS = 101,
 162         HTTP_CREATED = 201,
 163         HTTP_ACCEPTED = 202,
 164         HTTP_NON_AUTHORITATIVE_INFO = 203,
 165         HTTP_NO_CONTENT = 204,
 166         HTTP_MULTIPLE_CHOICES = 300,
 167         HTTP_MOVED_PERMANENTLY = 301,
 168         HTTP_NOT_MODIFIED = 304,
 169         HTTP_PAYMENT_REQUIRED = 402,
 170         HTTP_BAD_GATEWAY = 502,
 171         HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
 172         HTTP_RESPONSE_SETSIZE = 0xffffffff
 173 #endif
 174 };
 175
 176 static const uint16_t http_response_type[] ALIGN2 = {
 177         HTTP_OK,
 178 #if ENABLE_FEATURE_HTTPD_RANGES
 179         HTTP_PARTIAL_CONTENT,
 180 #endif
 181         HTTP_MOVED_TEMPORARILY,
 182         HTTP_REQUEST_TIMEOUT,
 183         HTTP_NOT_IMPLEMENTED,
 184 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 185         HTTP_UNAUTHORIZED,
 186 #endif
 187         HTTP_NOT_FOUND,
 188         HTTP_BAD_REQUEST,
 189         HTTP_FORBIDDEN,
 190         HTTP_INTERNAL_SERVER_ERROR,
 191 #if 0   /* not implemented */
 192         HTTP_CREATED,
 193         HTTP_ACCEPTED,
 194         HTTP_NO_CONTENT,
 195         HTTP_MULTIPLE_CHOICES,
 196         HTTP_MOVED_PERMANENTLY,
 197         HTTP_NOT_MODIFIED,
 198         HTTP_BAD_GATEWAY,
 199         HTTP_SERVICE_UNAVAILABLE,
 200 #endif
 201 };
 202
 203 static const struct {
 204         const char *name;
 205         const char *info;
 206 } http_response[ARRAY_SIZE(http_response_type)] = {
 207         { "OK", NULL },
 208 #if ENABLE_FEATURE_HTTPD_RANGES
 209         { "Partial Content", NULL },
 210 #endif
 211         { "Found", NULL },
 212         { "Request Timeout", "No request appeared within 60 seconds" },
 213         { "Not Implemented", "The requested method is not recognized" },
 214 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 215         { "Unauthorized", "" },
 216 #endif
 217         { "Not Found", "The requested URL was not found" },
 218         { "Bad Request", "Unsupported method" },
 219         { "Forbidden", ""  },
 220         { "Internal Server Error", "Internal Server Error" },
 221 #if 0   /* not implemented */
 222         { "Created" },
 223         { "Accepted" },
 224         { "No Content" },
 225         { "Multiple Choices" },
 226         { "Moved Permanently" },
 227         { "Not Modified" },
 228         { "Bad Gateway", "" },
 229         { "Service Unavailable", "" },
 230 #endif
 231 };
 232
 233
 234 struct globals {
 235         int verbose;            /* must be int (used by getopt32) */
 236         smallint flg_deny_all;
 237
 238         unsigned rmt_ip;        /* used for IP-based allow/deny rules */
 239         time_t last_mod;
 240         char *rmt_ip_str;       /* for $REMOTE_ADDR and $REMOTE_PORT */
 241         const char *bind_addr_or_port;
 242
 243         const char *g_query;
 244         const char *opt_c_configFile;
 245         const char *home_httpd;
 246         const char *index_page;
 247
 248         const char *found_mime_type;
 249         const char *found_moved_temporarily;
 250         Htaccess_IP *ip_a_d;    /* config allow/deny lines */
 251
 252         IF_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;)
 253         IF_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
 254         IF_FEATURE_HTTPD_CGI(char *referer;)
 255         IF_FEATURE_HTTPD_CGI(char *user_agent;)
 256         IF_FEATURE_HTTPD_CGI(char *host;)
 257         IF_FEATURE_HTTPD_CGI(char *http_accept;)
 258         IF_FEATURE_HTTPD_CGI(char *http_accept_language;)
 259
 260         off_t file_size;        /* -1 - unknown */
 261 #if ENABLE_FEATURE_HTTPD_RANGES
 262         off_t range_start;
 263         off_t range_end;
 264         off_t range_len;
 265 #endif
 266
 267 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 268         Htaccess *g_auth;       /* config user:password lines */
 269 #endif
 270         Htaccess *mime_a;       /* config mime types */
 271 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 272         Htaccess *script_i;     /* config script interpreters */
 273 #endif
 274         char *iobuf;            /* [IOBUF_SIZE] */
 275 #define hdr_buf bb_common_bufsiz1
 276         char *hdr_ptr;
 277         int hdr_cnt;
 278 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 279         const char *http_error_page[ARRAY_SIZE(http_response_type)];
 280 #endif
 281 #if ENABLE_FEATURE_HTTPD_PROXY
 282         Htaccess_Proxy *proxy;
 283 #endif
 284 };
 285 #define G (*ptr_to_globals)
 286 #define verbose           (G.verbose          )
 287 #define flg_deny_all      (G.flg_deny_all     )
 288 #define rmt_ip            (G.rmt_ip           )
 289 #define bind_addr_or_port (G.bind_addr_or_port)
 290 #define g_query           (G.g_query          )
 291 #define opt_c_configFile  (G.opt_c_configFile )
 292 #define home_httpd        (G.home_httpd       )
 293 #define index_page        (G.index_page       )
 294 #define found_mime_type   (G.found_mime_type  )
 295 #define found_moved_temporarily (G.found_moved_temporarily)
 296 #define last_mod          (G.last_mod         )
 297 #define ip_a_d            (G.ip_a_d           )
 298 #define g_realm           (G.g_realm          )
 299 #define remoteuser        (G.remoteuser       )
 300 #define referer           (G.referer          )
 301 #define user_agent        (G.user_agent       )
 302 #define host              (G.host             )
 303 #define http_accept       (G.http_accept      )
 304 #define http_accept_language (G.http_accept_language)
 305 #define file_size         (G.file_size        )
 306 #if ENABLE_FEATURE_HTTPD_RANGES
 307 #define range_start       (G.range_start      )
 308 #define range_end         (G.range_end        )
 309 #define range_len         (G.range_len        )
 310 #else
 311 enum {
 312         range_start = 0,
 313         range_end = MAXINT(off_t) - 1,
 314         range_len = MAXINT(off_t),
 315 };
 316 #endif
 317 #define rmt_ip_str        (G.rmt_ip_str       )
 318 #define g_auth            (G.g_auth           )
 319 #define mime_a            (G.mime_a           )
 320 #define script_i          (G.script_i         )
 321 #define iobuf             (G.iobuf            )
 322 #define hdr_ptr           (G.hdr_ptr          )
 323 #define hdr_cnt           (G.hdr_cnt          )
 324 #define http_error_page   (G.http_error_page  )
 325 #define proxy             (G.proxy            )
 326 #define INIT_G() do { \
 327         SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
 328         IF_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \
 329         bind_addr_or_port = "80"; \
 330         index_page = "index.html"; \
 331         file_size = -1; \
 332 } while (0)
 333
 334
 335 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
 336
 337 /* Prototypes */
 338 enum {
 339         SEND_HEADERS     = (1 << 0),
 340         SEND_BODY        = (1 << 1),
 341         SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY,
 342 };
 343 static void send_file_and_exit(const char *url, int what) NORETURN;
 344
 345 static void free_llist(has_next_ptr **pptr)
 346 {
 347         has_next_ptr *cur = *pptr;
 348         while (cur) {
 349                 has_next_ptr *t = cur;
 350                 cur = cur->next;
 351                 free(t);
 352         }
 353         *pptr = NULL;
 354 }
 355
 356 static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr)
 357 {
 358         free_llist((has_next_ptr**)pptr);
 359 }
 360
 361 static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr)
 362 {
 363         free_llist((has_next_ptr**)pptr);
 364 }
 365
 366 /* Returns presumed mask width in bits or < 0 on error.
 367  * Updates strp, stores IP at provided pointer */
 368 static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc)
 369 {
 370         const char *p = *strp;
 371         int auto_mask = 8;
 372         unsigned ip = 0;
 373         int j;
 374
 375         if (*p == '/')
 376                 return -auto_mask;
 377
 378         for (j = 0; j < 4; j++) {
 379                 unsigned octet;
 380
 381                 if ((*p < '0' || *p > '9') && *p != '/' && *p)
 382                         return -auto_mask;
 383                 octet = 0;
 384                 while (*p >= '0' && *p <= '9') {
 385                         octet *= 10;
 386                         octet += *p - '0';
 387                         if (octet > 255)
 388                                 return -auto_mask;
 389                         p++;
 390                 }
 391                 if (*p == '.')
 392                         p++;
 393                 if (*p != '/' && *p)
 394                         auto_mask += 8;
 395                 ip = (ip << 8) | octet;
 396         }
 397         if (*p) {
 398                 if (*p != endc)
 399                         return -auto_mask;
 400                 p++;
 401                 if (*p == '\0')
 402                         return -auto_mask;
 403         }
 404         *ipp = ip;
 405         *strp = p;
 406         return auto_mask;
 407 }
 408
 409 /* Returns 0 on success. Stores IP and mask at provided pointers */
 410 static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp)
 411 {
 412         int i;
 413         unsigned mask;
 414         char *p;
 415
 416         i = scan_ip(&str, ipp, '/');
 417         if (i < 0)
 418                 return i;
 419
 420         if (*str) {
 421                 /* there is /xxx after dotted-IP address */
 422                 i = bb_strtou(str, &p, 10);
 423                 if (*p == '.') {
 424                         /* 'xxx' itself is dotted-IP mask, parse it */
 425                         /* (return 0 (success) only if it has N.N.N.N form) */
 426                         return scan_ip(&str, maskp, '\0') - 32;
 427                 }
 428                 if (*p)
 429                         return -1;
 430         }
 431
 432         if (i > 32)
 433                 return -1;
 434
 435         if (sizeof(unsigned) == 4 && i == 32) {
 436                 /* mask >>= 32 below may not work */
 437                 mask = 0;
 438         } else {
 439                 mask = 0xffffffff;
 440                 mask >>= i;
 441         }
 442         /* i == 0 -> *maskp = 0x00000000
 443          * i == 1 -> *maskp = 0x80000000
 444          * i == 4 -> *maskp = 0xf0000000
 445          * i == 31 -> *maskp = 0xfffffffe
 446          * i == 32 -> *maskp = 0xffffffff */
 447         *maskp = (uint32_t)(~mask);
 448         return 0;
 449 }
 450
 451 /*
 452  * Parse configuration file into in-memory linked list.
 453  *
 454  * Any previous IP rules are discarded.
 455  * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
 456  * are also discarded.  That is, previous settings are retained if flag is
 457  * SUBDIR_PARSE.
 458  * Error pages are only parsed on the main config file.
 459  *
 460  * path   Path where to look for httpd.conf (without filename).
 461  * flag   Type of the parse request.
 462  */
 463 /* flag param: */
 464 enum {
 465         FIRST_PARSE    = 0, /* path will be "/etc" */
 466         SIGNALED_PARSE = 1, /* path will be "/etc" */
 467         SUBDIR_PARSE   = 2, /* path will be derived from URL */
 468 };
 469 static void parse_conf(const char *path, int flag)
 470 {
 471         /* internally used extra flag state */
 472         enum { TRY_CURDIR_PARSE = 3 };
 473
 474         FILE *f;
 475         const char *filename;
 476         char buf[160];
 477
 478         /* discard old rules */
 479         free_Htaccess_IP_list(&ip_a_d);
 480         flg_deny_all = 0;
 481         /* retain previous auth and mime config only for subdir parse */
 482         if (flag != SUBDIR_PARSE) {
 483                 free_Htaccess_list(&mime_a);
 484 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 485                 free_Htaccess_list(&g_auth);
 486 #endif
 487 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 488                 free_Htaccess_list(&script_i);
 489 #endif
 490         }
 491
 492         filename = opt_c_configFile;
 493         if (flag == SUBDIR_PARSE || filename == NULL) {
 494                 filename = alloca(strlen(path) + sizeof(HTTPD_CONF) + 2);
 495                 sprintf((char *)filename, "%s/%s", path, HTTPD_CONF);
 496         }
 497
 498         while ((f = fopen_for_read(filename)) == NULL) {
 499                 if (flag >= SUBDIR_PARSE) { /* SUBDIR or TRY_CURDIR */
 500                         /* config file not found, no changes to config */
 501                         return;
 502                 }
 503                 if (flag == FIRST_PARSE) {
 504                         /* -c CONFFILE given, but CONFFILE doesn't exist? */
 505                         if (opt_c_configFile)
 506                                 bb_simple_perror_msg_and_die(opt_c_configFile);
 507                         /* else: no -c, thus we looked at /etc/httpd.conf,
 508                          * and it's not there. try ./httpd.conf: */
 509                 }
 510                 flag = TRY_CURDIR_PARSE;
 511                 filename = HTTPD_CONF;
 512         }
 513
 514 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 515         /* in "/file:user:pass" lines, we prepend path in subdirs */
 516         if (flag != SUBDIR_PARSE)
 517                 path = "";
 518 #endif
 519         /* The lines can be:
 520          *
 521          * I:default_index_file
 522          * H:http_home
 523          * [AD]:IP[/mask]   # allow/deny, * for wildcard
 524          * Ennn:error.html  # error page for status nnn
 525          * P:/url:[http://]hostname[:port]/new/path # reverse proxy
 526          * .ext:mime/type   # mime type
 527          * *.php:/path/php  # run xxx.php through an interpreter
 528          * /file:user:pass  # username and password
 529          */
 530         while (fgets(buf, sizeof(buf), f) != NULL) {
 531                 unsigned strlen_buf;
 532                 unsigned char ch;
 533                 char *after_colon = NULL;
 534
 535                 { /* remove all whitespace, and # comments */
 536                         char *p, *p0;
 537
 538                         p = p0 = buf;
 539                         while ((ch = *p0++) != '\0' && ch != '#') {
 540                                 if (!isspace(ch)) {
 541                                         *p++ = ch;
 542                                         if (ch == ':' && after_colon == NULL)
 543                                                 after_colon = p;
 544                                 }
 545                         }
 546                         *p = '\0';
 547                         strlen_buf = p - buf;
 548                         if (strlen_buf == 0)
 549                                 continue;
 550                 }
 551
 552                 /* strange line? */
 553                 if (after_colon == NULL || *after_colon == '\0')
 554                         goto config_error;
 555
 556                 ch = (buf[0] & ~0x20); /* toupper if it's a letter */
 557
 558                 if (ch == 'I') {
 559                         index_page = xstrdup(after_colon);
 560                         continue;
 561                 }
 562
 563                 /* do not allow jumping around using H in subdir's configs */
 564                 if (flag == FIRST_PARSE && ch == 'H') {
 565                         home_httpd = xstrdup(after_colon);
 566                         xchdir(home_httpd);
 567                         continue;
 568                 }
 569
 570                 if (ch == 'A' || ch == 'D') {
 571                         Htaccess_IP *pip;
 572
 573                         if (*after_colon == '*') {
 574                                 if (ch == 'D') {
 575                                         /* memorize "deny all" */
 576                                         flg_deny_all = 1;
 577                                 }
 578                                 /* skip assumed "A:*", it is a default anyway */
 579                                 continue;
 580                         }
 581                         /* store "allow/deny IP/mask" line */
 582                         pip = xzalloc(sizeof(*pip));
 583                         if (scan_ip_mask(after_colon, &pip->ip, &pip->mask)) {
 584                                 /* IP{/mask} syntax error detected, protect all */
 585                                 ch = 'D';
 586                                 pip->mask = 0;
 587                         }
 588                         pip->allow_deny = ch;
 589                         if (ch == 'D') {
 590                                 /* Deny:from_IP - prepend */
 591                                 pip->next = ip_a_d;
 592                                 ip_a_d = pip;
 593                         } else {
 594                                 /* A:from_IP - append (thus all D's precedes A's) */
 595                                 Htaccess_IP *prev_IP = ip_a_d;
 596                                 if (prev_IP == NULL) {
 597                                         ip_a_d = pip;
 598                                 } else {
 599                                         while (prev_IP->next)
 600                                                 prev_IP = prev_IP->next;
 601                                         prev_IP->next = pip;
 602                                 }
 603                         }
 604                         continue;
 605                 }
 606
 607 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 608                 if (flag == FIRST_PARSE && ch == 'E') {
 609                         unsigned i;
 610                         int status = atoi(buf + 1); /* error status code */
 611
 612                         if (status < HTTP_CONTINUE) {
 613                                 goto config_error;
 614                         }
 615                         /* then error page; find matching status */
 616                         for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
 617                                 if (http_response_type[i] == status) {
 618                                         /* We chdir to home_httpd, thus no need to
 619                                          * concat_path_file(home_httpd, after_colon)
 620                                          * here */
 621                                         http_error_page[i] = xstrdup(after_colon);
 622                                         break;
 623                                 }
 624                         }
 625                         continue;
 626                 }
 627 #endif
 628
 629 #if ENABLE_FEATURE_HTTPD_PROXY
 630                 if (flag == FIRST_PARSE && ch == '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 = after_colon;
 636                         host_port = strchr(after_colon, ':');
 637                         if (host_port == NULL) {
 638                                 goto config_error;
 639                         }
 640                         *host_port++ = '\0';
 641                         if (strncmp(host_port, "http://", 7) == 0)
 642                                 host_port += 7;
 643                         if (*host_port == '\0') {
 644                                 goto config_error;
 645                         }
 646                         url_to = strchr(host_port, '/');
 647                         if (url_to == NULL) {
 648                                 goto config_error;
 649                         }
 650                         *url_to = '\0';
 651                         proxy_entry = xzalloc(sizeof(*proxy_entry));
 652                         proxy_entry->url_from = xstrdup(url_from);
 653                         proxy_entry->host_port = xstrdup(host_port);
 654                         *url_to = '/';
 655                         proxy_entry->url_to = xstrdup(url_to);
 656                         proxy_entry->next = proxy;
 657                         proxy = proxy_entry;
 658                         continue;
 659                 }
 660 #endif
 661                 /* the rest of directives are non-alphabetic,
 662                  * must avoid using "toupper'ed" ch */
 663                 ch = buf[0];
 664
 665                 if (ch == '.' /* ".ext:mime/type" */
 666 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 667                  || (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */
 668 #endif
 669                 ) {
 670                         char *p;
 671                         Htaccess *cur;
 672
 673                         cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + strlen_buf);
 674                         strcpy(cur->before_colon, buf);
 675                         p = cur->before_colon + (after_colon - buf);
 676                         p[-1] = '\0';
 677                         cur->after_colon = p;
 678                         if (ch == '.') {
 679                                 /* .mime line: prepend to mime_a list */
 680                                 cur->next = mime_a;
 681                                 mime_a = cur;
 682                         }
 683 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 684                         else {
 685                                 /* script interpreter line: prepend to script_i list */
 686                                 cur->next = script_i;
 687                                 script_i = cur;
 688                         }
 689 #endif
 690                         continue;
 691                 }
 692
 693 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 694                 if (ch == '/') { /* "/file:user:pass" */
 695                         char *p;
 696                         Htaccess *cur;
 697                         unsigned file_len;
 698
 699                         /* note: path is "" unless we are in SUBDIR parse,
 700                          * otherwise it does NOT start with "/" */
 701                         cur = xzalloc(sizeof(*cur) /* includes space for NUL */
 702                                 + 1 + strlen(path)
 703                                 + strlen_buf
 704                                 );
 705                         /* form "/path/file" */
 706                         sprintf(cur->before_colon, "/%s%.*s",
 707                                 path,
 708                                 after_colon - buf - 1, /* includes "/", but not ":" */
 709                                 buf);
 710                         /* canonicalize it */
 711                         p = bb_simplify_abs_path_inplace(cur->before_colon);
 712                         file_len = p - cur->before_colon;
 713                         /* add "user:pass" after NUL */
 714                         strcpy(++p, after_colon);
 715                         cur->after_colon = p;
 716
 717                         /* insert cur into g_auth */
 718                         /* g_auth is sorted by decreased filename length */
 719                         {
 720                                 Htaccess *auth, **authp;
 721
 722                                 authp = &g_auth;
 723                                 while ((auth = *authp) != NULL) {
 724                                         if (file_len >= strlen(auth->before_colon)) {
 725                                                 /* insert cur before auth */
 726                                                 cur->next = auth;
 727                                                 break;
 728                                         }
 729                                         authp = &auth->next;
 730                                 }
 731                                 *authp = cur;
 732                         }
 733                         continue;
 734                 }
 735 #endif /* BASIC_AUTH */
 736
 737                 /* the line is not recognized */
 738  config_error:
 739                 bb_error_msg("config error '%s' in '%s'", buf, filename);
 740          } /* while (fgets) */
 741
 742          fclose(f);
 743 }
 744
 745 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
 746 /*
 747  * Given a string, html-encode special characters.
 748  * This is used for the -e command line option to provide an easy way
 749  * for scripts to encode result data without confusing browsers.  The
 750  * returned string pointer is memory allocated by malloc().
 751  *
 752  * Returns a pointer to the encoded string (malloced).
 753  */
 754 static char *encodeString(const char *string)
 755 {
 756         /* take the simple route and encode everything */
 757         /* could possibly scan once to get length.     */
 758         int len = strlen(string);
 759         char *out = xmalloc(len * 6 + 1);
 760         char *p = out;
 761         char ch;
 762
 763         while ((ch = *string++)) {
 764                 /* very simple check for what to encode */
 765                 if (isalnum(ch))
 766                         *p++ = ch;
 767                 else
 768                         p += sprintf(p, "&#%d;", (unsigned char) ch);
 769         }
 770         *p = '\0';
 771         return out;
 772 }
 773 #endif          /* FEATURE_HTTPD_ENCODE_URL_STR */
 774
 775 /*
 776  * Given a URL encoded string, convert it to plain ascii.
 777  * Since decoding always makes strings smaller, the decode is done in-place.
 778  * Thus, callers should xstrdup() the argument if they do not want the
 779  * argument modified.  The return is the original pointer, allowing this
 780  * function to be easily used as arguments to other functions.
 781  *
 782  * string    The first string to decode.
 783  * option_d  1 if called for httpd -d
 784  *
 785  * Returns a pointer to the decoded string (same as input).
 786  */
 787 static unsigned hex_to_bin(unsigned char c)
 788 {
 789         unsigned v;
 790
 791         v = c - '0';
 792         if (v <= 9)
 793                 return v;
 794         /* c | 0x20: letters to lower case, non-letters
 795          * to (potentially different) non-letters */
 796         v = (unsigned)(c | 0x20) - 'a';
 797         if (v <= 5)
 798                 return v + 10;
 799         return ~0;
 800 }
 801 /* For testing:
 802 void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); }
 803 int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f');
 804 t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; }
 805 */
 806 static char *decodeString(char *orig, int option_d)
 807 {
 808         /* note that decoded string is always shorter than original */
 809         char *string = orig;
 810         char *ptr = string;
 811         char c;
 812
 813         while ((c = *ptr++) != '\0') {
 814                 unsigned v;
 815
 816                 if (option_d && c == '+') {
 817                         *string++ = ' ';
 818                         continue;
 819                 }
 820                 if (c != '%') {
 821                         *string++ = c;
 822                         continue;
 823                 }
 824                 v = hex_to_bin(ptr[0]);
 825                 if (v > 15) {
 826  bad_hex:
 827                         if (!option_d)
 828                                 return NULL;
 829                         *string++ = '%';
 830                         continue;
 831                 }
 832                 v = (v * 16) | hex_to_bin(ptr[1]);
 833                 if (v > 255)
 834                         goto bad_hex;
 835                 if (!option_d && (v == '/' || v == '\0')) {
 836                         /* caller takes it as indication of invalid
 837                          * (dangerous wrt exploits) chars */
 838                         return orig + 1;
 839                 }
 840                 *string++ = v;
 841                 ptr += 2;
 842         }
 843         *string = '\0';
 844         return orig;
 845 }
 846
 847 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 848 /*
 849  * Decode a base64 data stream as per rfc1521.
 850  * Note that the rfc states that non base64 chars are to be ignored.
 851  * Since the decode always results in a shorter size than the input,
 852  * it is OK to pass the input arg as an output arg.
 853  * Parameter: a pointer to a base64 encoded string.
 854  * Decoded data is stored in-place.
 855  */
 856 static void decodeBase64(char *Data)
 857 {
 858         const unsigned char *in = (const unsigned char *)Data;
 859         /* The decoded size will be at most 3/4 the size of the encoded */
 860         unsigned ch = 0;
 861         int i = 0;
 862
 863         while (*in) {
 864                 int t = *in++;
 865
 866                 if (t >= '0' && t <= '9')
 867                         t = t - '0' + 52;
 868                 else if (t >= 'A' && t <= 'Z')
 869                         t = t - 'A';
 870                 else if (t >= 'a' && t <= 'z')
 871                         t = t - 'a' + 26;
 872                 else if (t == '+')
 873                         t = 62;
 874                 else if (t == '/')
 875                         t = 63;
 876                 else if (t == '=')
 877                         t = 0;
 878                 else
 879                         continue;
 880
 881                 ch = (ch << 6) | t;
 882                 i++;
 883                 if (i == 4) {
 884                         *Data++ = (char) (ch >> 16);
 885                         *Data++ = (char) (ch >> 8);
 886                         *Data++ = (char) ch;
 887                         i = 0;
 888                 }
 889         }
 890         *Data = '\0';
 891 }
 892 #endif
 893
 894 /*
 895  * Create a listen server socket on the designated port.
 896  */
 897 static int openServer(void)
 898 {
 899         unsigned n = bb_strtou(bind_addr_or_port, NULL, 10);
 900         if (!errno && n && n <= 0xffff)
 901                 n = create_and_bind_stream_or_die(NULL, n);
 902         else
 903                 n = create_and_bind_stream_or_die(bind_addr_or_port, 80);
 904         xlisten(n, 9);
 905         return n;
 906 }
 907
 908 /*
 909  * Log the connection closure and exit.
 910  */
 911 static void log_and_exit(void) NORETURN;
 912 static void log_and_exit(void)
 913 {
 914         /* Paranoia. IE said to be buggy. It may send some extra data
 915          * or be confused by us just exiting without SHUT_WR. Oh well. */
 916         shutdown(1, SHUT_WR);
 917         /* Why??
 918         (this also messes up stdin when user runs httpd -i from terminal)
 919         ndelay_on(0);
 920         while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0)
 921                 continue;
 922         */
 923
 924         if (verbose > 2)
 925                 bb_error_msg("closed");
 926         _exit(xfunc_error_retval);
 927 }
 928
 929 /*
 930  * Create and send HTTP response headers.
 931  * The arguments are combined and sent as one write operation.  Note that
 932  * IE will puke big-time if the headers are not sent in one packet and the
 933  * second packet is delayed for any reason.
 934  * responseNum - the result code to send.
 935  */
 936 static void send_headers(int responseNum)
 937 {
 938         static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT";
 939
 940         const char *responseString = "";
 941         const char *infoString = NULL;
 942         const char *mime_type;
 943 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 944         const char *error_page = NULL;
 945 #endif
 946         unsigned i;
 947         time_t timer = time(NULL);
 948         char tmp_str[80];
 949         int len;
 950
 951         for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
 952                 if (http_response_type[i] == responseNum) {
 953                         responseString = http_response[i].name;
 954                         infoString = http_response[i].info;
 955 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 956                         error_page = http_error_page[i];
 957 #endif
 958                         break;
 959                 }
 960         }
 961         /* error message is HTML */
 962         mime_type = responseNum == HTTP_OK ?
 963                                 found_mime_type : "text/html";
 964
 965         if (verbose)
 966                 bb_error_msg("response:%u", responseNum);
 967
 968         /* emit the current date */
 969         strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer));
 970         len = sprintf(iobuf,
 971                         "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
 972                         "Date: %s\r\nConnection: close\r\n",
 973                         responseNum, responseString, mime_type, tmp_str);
 974
 975 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 976         if (responseNum == HTTP_UNAUTHORIZED) {
 977                 len += sprintf(iobuf + len,
 978                                 "WWW-Authenticate: Basic realm=\"%s\"\r\n",
 979                                 g_realm);
 980         }
 981 #endif
 982         if (responseNum == HTTP_MOVED_TEMPORARILY) {
 983                 len += sprintf(iobuf + len, "Location: %s/%s%s\r\n",
 984                                 found_moved_temporarily,
 985                                 (g_query ? "?" : ""),
 986                                 (g_query ? g_query : ""));
 987         }
 988
 989 #if ENABLE_FEATURE_HTTPD_ERROR_PAGES
 990         if (error_page && access(error_page, R_OK) == 0) {
 991                 strcat(iobuf, "\r\n");
 992                 len += 2;
 993
 994                 if (DEBUG)
 995                         fprintf(stderr, "headers: '%s'\n", iobuf);
 996                 full_write(STDOUT_FILENO, iobuf, len);
 997                 if (DEBUG)
 998                         fprintf(stderr, "writing error page: '%s'\n", error_page);
 999                 return send_file_and_exit(error_page, SEND_BODY);
1000         }
1001 #endif
1002
1003         if (file_size != -1) {    /* file */
1004                 strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod));
1005 #if ENABLE_FEATURE_HTTPD_RANGES
1006                 if (responseNum == HTTP_PARTIAL_CONTENT) {
1007                         len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n",
1008                                         range_start,
1009                                         range_end,
1010                                         file_size);
1011                         file_size = range_end - range_start + 1;
1012                 }
1013 #endif
1014                 len += sprintf(iobuf + len,
1015 #if ENABLE_FEATURE_HTTPD_RANGES
1016                         "Accept-Ranges: bytes\r\n"
1017 #endif
1018                         "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n",
1019                                 tmp_str,
1020                                 "Content-length:",
1021                                 file_size
1022                 );
1023         }
1024         iobuf[len++] = '\r';
1025         iobuf[len++] = '\n';
1026         if (infoString) {
1027                 len += sprintf(iobuf + len,
1028                                 "<HTML><HEAD><TITLE>%d %s</TITLE></HEAD>\n"
1029                                 "<BODY><H1>%d %s</H1>\n%s\n</BODY></HTML>\n",
1030                                 responseNum, responseString,
1031                                 responseNum, responseString, infoString);
1032         }
1033         if (DEBUG)
1034                 fprintf(stderr, "headers: '%s'\n", iobuf);
1035         if (full_write(STDOUT_FILENO, iobuf, len) != len) {
1036                 if (verbose > 1)
1037                         bb_perror_msg("error");
1038                 log_and_exit();
1039         }
1040 }
1041
1042 static void send_headers_and_exit(int responseNum) NORETURN;
1043 static void send_headers_and_exit(int responseNum)
1044 {
1045         send_headers(responseNum);
1046         log_and_exit();
1047 }
1048
1049 /*
1050  * Read from the socket until '\n' or EOF. '\r' chars are removed.
1051  * '\n' is replaced with NUL.
1052  * Return number of characters read or 0 if nothing is read
1053  * ('\r' and '\n' are not counted).
1054  * Data is returned in iobuf.
1055  */
1056 static int get_line(void)
1057 {
1058         int count = 0;
1059         char c;
1060
1061         alarm(HEADER_READ_TIMEOUT);
1062         while (1) {
1063                 if (hdr_cnt <= 0) {
1064                         hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1065                         if (hdr_cnt <= 0)
1066                                 break;
1067                         hdr_ptr = hdr_buf;
1068                 }
1069                 iobuf[count] = c = *hdr_ptr++;
1070                 hdr_cnt--;
1071
1072                 if (c == '\r')
1073                         continue;
1074                 if (c == '\n') {
1075                         iobuf[count] = '\0';
1076                         break;
1077                 }
1078                 if (count < (IOBUF_SIZE - 1))      /* check overflow */
1079                         count++;
1080         }
1081         return count;
1082 }
1083
1084 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1085
1086 /* gcc 4.2.1 fares better with NOINLINE */
1087 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN;
1088 static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len)
1089 {
1090         enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */
1091         struct pollfd pfd[3];
1092         int out_cnt; /* we buffer a bit of initial CGI output */
1093         int count;
1094
1095         /* iobuf is used for CGI -> network data,
1096          * hdr_buf is for network -> CGI data (POSTDATA) */
1097
1098         /* If CGI dies, we still want to correctly finish reading its output
1099          * and send it to the peer. So please no SIGPIPEs! */
1100         signal(SIGPIPE, SIG_IGN);
1101
1102         // We inconsistently handle a case when more POSTDATA from network
1103         // is coming than we expected. We may give *some part* of that
1104         // extra data to CGI.
1105
1106         //if (hdr_cnt > post_len) {
1107         //      /* We got more POSTDATA from network than we expected */
1108         //      hdr_cnt = post_len;
1109         //}
1110         post_len -= hdr_cnt;
1111         /* post_len - number of POST bytes not yet read from network */
1112
1113         /* NB: breaking out of this loop jumps to log_and_exit() */
1114         out_cnt = 0;
1115         while (1) {
1116                 memset(pfd, 0, sizeof(pfd));
1117
1118                 pfd[FROM_CGI].fd = fromCgi_rd;
1119                 pfd[FROM_CGI].events = POLLIN;
1120
1121                 if (toCgi_wr) {
1122                         pfd[TO_CGI].fd = toCgi_wr;
1123                         if (hdr_cnt > 0) {
1124                                 pfd[TO_CGI].events = POLLOUT;
1125                         } else if (post_len > 0) {
1126                                 pfd[0].events = POLLIN;
1127                         } else {
1128                                 /* post_len <= 0 && hdr_cnt <= 0:
1129                                  * no more POST data to CGI,
1130                                  * let CGI see EOF on CGI's stdin */
1131                                 close(toCgi_wr);
1132                                 toCgi_wr = 0;
1133                         }
1134                 }
1135
1136                 /* Now wait on the set of sockets */
1137                 count = safe_poll(pfd, 3, -1);
1138                 if (count <= 0) {
1139 #if 0
1140                         if (safe_waitpid(pid, &status, WNOHANG) <= 0) {
1141                                 /* Weird. CGI didn't exit and no fd's
1142                                  * are ready, yet poll returned?! */
1143                                 continue;
1144                         }
1145                         if (DEBUG && WIFEXITED(status))
1146                                 bb_error_msg("CGI exited, status=%d", WEXITSTATUS(status));
1147                         if (DEBUG && WIFSIGNALED(status))
1148                                 bb_error_msg("CGI killed, signal=%d", WTERMSIG(status));
1149 #endif
1150                         break;
1151                 }
1152
1153                 if (pfd[TO_CGI].revents) {
1154                         /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */
1155                         /* Have data from peer and can write to CGI */
1156                         count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt);
1157                         /* Doesn't happen, we dont use nonblocking IO here
1158                          *if (count < 0 && errno == EAGAIN) {
1159                          *      ...
1160                          *} else */
1161                         if (count > 0) {
1162                                 hdr_ptr += count;
1163                                 hdr_cnt -= count;
1164                         } else {
1165                                 /* EOF/broken pipe to CGI, stop piping POST data */
1166                                 hdr_cnt = post_len = 0;
1167                         }
1168                 }
1169
1170                 if (pfd[0].revents) {
1171                         /* post_len > 0 && hdr_cnt == 0 here */
1172                         /* We expect data, prev data portion is eaten by CGI
1173                          * and there *is* data to read from the peer
1174                          * (POSTDATA) */
1175                         //count = post_len > (int)sizeof(hdr_buf) ? (int)sizeof(hdr_buf) : post_len;
1176                         //count = safe_read(STDIN_FILENO, hdr_buf, count);
1177                         count = safe_read(STDIN_FILENO, hdr_buf, sizeof(hdr_buf));
1178                         if (count > 0) {
1179                                 hdr_cnt = count;
1180                                 hdr_ptr = hdr_buf;
1181                                 post_len -= count;
1182                         } else {
1183                                 /* no more POST data can be read */
1184                                 post_len = 0;
1185                         }
1186                 }
1187
1188                 if (pfd[FROM_CGI].revents) {
1189                         /* There is something to read from CGI */
1190                         char *rbuf = iobuf;
1191
1192                         /* Are we still buffering CGI output? */
1193                         if (out_cnt >= 0) {
1194                                 /* HTTP_200[] has single "\r\n" at the end.
1195                                  * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html,
1196                                  * CGI scripts MUST send their own header terminated by
1197                                  * empty line, then data. That's why we have only one
1198                                  * <cr><lf> pair here. We will output "200 OK" line
1199                                  * if needed, but CGI still has to provide blank line
1200                                  * between header and body */
1201
1202                                 /* Must use safe_read, not full_read, because
1203                                  * CGI may output a few first bytes and then wait
1204                                  * for POSTDATA without closing stdout.
1205                                  * With full_read we may wait here forever. */
1206                                 count = safe_read(fromCgi_rd, rbuf + out_cnt, PIPE_BUF - 8);
1207                                 if (count <= 0) {
1208                                         /* eof (or error) and there was no "HTTP",
1209                                          * so write it, then write received data */
1210                                         if (out_cnt) {
1211                                                 full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1);
1212                                                 full_write(STDOUT_FILENO, rbuf, out_cnt);
1213                                         }
1214                                         break; /* CGI stdout is closed, exiting */
1215                                 }
1216                                 out_cnt += count;
1217                                 count = 0;
1218                                 /* "Status" header format is: "Status: 302 Redirected\r\n" */
1219                                 if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) {
1220                                         /* send "HTTP/1.0 " */
1221                                         if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9)
1222                                                 break;
1223                                         rbuf += 8; /* skip "Status: " */
1224                                         count = out_cnt - 8;
1225                                         out_cnt = -1; /* buffering off */
1226                                 } else if (out_cnt >= 4) {
1227                                         /* Did CGI add "HTTP"? */
1228                                         if (memcmp(rbuf, HTTP_200, 4) != 0) {
1229                                                 /* there is no "HTTP", do it ourself */
1230                                                 if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1)
1231                                                         break;
1232                                         }
1233                                         /* Commented out:
1234                                         if (!strstr(rbuf, "ontent-")) {
1235                                                 full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1236                                         }
1237                                          * Counter-example of valid CGI without Content-type:
1238                                          * echo -en "HTTP/1.0 302 Found\r\n"
1239                                          * echo -en "Location: http://www.busybox.net\r\n"
1240                                          * echo -en "\r\n"
1241                                          */
1242                                         count = out_cnt;
1243                                         out_cnt = -1; /* buffering off */
1244                                 }
1245                         } else {
1246                                 count = safe_read(fromCgi_rd, rbuf, PIPE_BUF);
1247                                 if (count <= 0)
1248                                         break;  /* eof (or error) */
1249                         }
1250                         if (full_write(STDOUT_FILENO, rbuf, count) != count)
1251                                 break;
1252                         if (DEBUG)
1253                                 fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf);
1254                 } /* if (pfd[FROM_CGI].revents) */
1255         } /* while (1) */
1256         log_and_exit();
1257 }
1258 #endif
1259
1260 #if ENABLE_FEATURE_HTTPD_CGI
1261
1262 static void setenv1(const char *name, const char *value)
1263 {
1264         setenv(name, value ? value : "", 1);
1265 }
1266
1267 /*
1268  * Spawn CGI script, forward CGI's stdin/out <=> network
1269  *
1270  * Environment variables are set up and the script is invoked with pipes
1271  * for stdin/stdout.  If a POST is being done the script is fed the POST
1272  * data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
1273  *
1274  * Parameters:
1275  * const char *url              The requested URL (with leading /).
1276  * int post_len                 Length of the POST body.
1277  * const char *cookie           For set HTTP_COOKIE.
1278  * const char *content_type     For set CONTENT_TYPE.
1279  */
1280 static void send_cgi_and_exit(
1281                 const char *url,
1282                 const char *request,
1283                 int post_len,
1284                 const char *cookie,
1285                 const char *content_type) NORETURN;
1286 static void send_cgi_and_exit(
1287                 const char *url,
1288                 const char *request,
1289                 int post_len,
1290                 const char *cookie,
1291                 const char *content_type)
1292 {
1293         struct fd_pair fromCgi;  /* CGI -> httpd pipe */
1294         struct fd_pair toCgi;    /* httpd -> CGI pipe */
1295         char *script;
1296         int pid;
1297
1298         /* Make a copy. NB: caller guarantees:
1299          * url[0] == '/', url[1] != '/' */
1300         url = xstrdup(url);
1301
1302         /*
1303          * We are mucking with environment _first_ and then vfork/exec,
1304          * this allows us to use vfork safely. Parent doesn't care about
1305          * these environment changes anyway.
1306          */
1307
1308         /* Check for [dirs/]script.cgi/PATH_INFO */
1309         script = (char*)url;
1310         while ((script = strchr(script + 1, '/')) != NULL) {
1311                 struct stat sb;
1312
1313                 *script = '\0';
1314                 if (!is_directory(url + 1, 1, &sb)) {
1315                         /* not directory, found script.cgi/PATH_INFO */
1316                         *script = '/';
1317                         break;
1318                 }
1319                 *script = '/'; /* is directory, find next '/' */
1320         }
1321         setenv1("PATH_INFO", script);   /* set to /PATH_INFO or "" */
1322         setenv1("REQUEST_METHOD", request);
1323         if (g_query) {
1324                 putenv(xasprintf("%s=%s?%s", "REQUEST_URI", url, g_query));
1325         } else {
1326                 setenv1("REQUEST_URI", url);
1327         }
1328         if (script != NULL)
1329                 *script = '\0';         /* cut off /PATH_INFO */
1330
1331         /* SCRIPT_FILENAME is required by PHP in CGI mode */
1332         if (home_httpd[0] == '/') {
1333                 char *fullpath = concat_path_file(home_httpd, url);
1334                 setenv1("SCRIPT_FILENAME", fullpath);
1335         }
1336         /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1337         setenv1("SCRIPT_NAME", url);
1338         /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html:
1339          * QUERY_STRING: The information which follows the ? in the URL
1340          * which referenced this script. This is the query information.
1341          * It should not be decoded in any fashion. This variable
1342          * should always be set when there is query information,
1343          * regardless of command line decoding. */
1344         /* (Older versions of bbox seem to do some decoding) */
1345         setenv1("QUERY_STRING", g_query);
1346         putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER);
1347         putenv((char*)"SERVER_PROTOCOL=HTTP/1.0");
1348         putenv((char*)"GATEWAY_INTERFACE=CGI/1.1");
1349         /* Having _separate_ variables for IP and port defeats
1350          * the purpose of having socket abstraction. Which "port"
1351          * are you using on Unix domain socket?
1352          * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense.
1353          * Oh well... */
1354         {
1355                 char *p = rmt_ip_str ? rmt_ip_str : (char*)"";
1356                 char *cp = strrchr(p, ':');
1357                 if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']'))
1358                         cp = NULL;
1359                 if (cp) *cp = '\0'; /* delete :PORT */
1360                 setenv1("REMOTE_ADDR", p);
1361                 if (cp) {
1362                         *cp = ':';
1363 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1364                         setenv1("REMOTE_PORT", cp + 1);
1365 #endif
1366                 }
1367         }
1368         setenv1("HTTP_USER_AGENT", user_agent);
1369         if (http_accept)
1370                 setenv1("HTTP_ACCEPT", http_accept);
1371         if (http_accept_language)
1372                 setenv1("HTTP_ACCEPT_LANGUAGE", http_accept_language);
1373         if (post_len)
1374                 putenv(xasprintf("CONTENT_LENGTH=%d", post_len));
1375         if (cookie)
1376                 setenv1("HTTP_COOKIE", cookie);
1377         if (content_type)
1378                 setenv1("CONTENT_TYPE", content_type);
1379 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1380         if (remoteuser) {
1381                 setenv1("REMOTE_USER", remoteuser);
1382                 putenv((char*)"AUTH_TYPE=Basic");
1383         }
1384 #endif
1385         if (referer)
1386                 setenv1("HTTP_REFERER", referer);
1387         setenv1("HTTP_HOST", host); /* set to "" if NULL */
1388         /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this,
1389          * just run "env SERVER_NAME=xyz httpd ..." instead */
1390
1391         xpiped_pair(fromCgi);
1392         xpiped_pair(toCgi);
1393
1394         pid = vfork();
1395         if (pid < 0) {
1396                 /* TODO: log perror? */
1397                 log_and_exit();
1398         }
1399
1400         if (!pid) {
1401                 /* Child process */
1402                 char *argv[3];
1403
1404                 xfunc_error_retval = 242;
1405
1406                 /* NB: close _first_, then move fds! */
1407                 close(toCgi.wr);
1408                 close(fromCgi.rd);
1409                 xmove_fd(toCgi.rd, 0);  /* replace stdin with the pipe */
1410                 xmove_fd(fromCgi.wr, 1);  /* replace stdout with the pipe */
1411                 /* User seeing stderr output can be a security problem.
1412                  * If CGI really wants that, it can always do dup itself. */
1413                 /* dup2(1, 2); */
1414
1415                 /* Chdiring to script's dir */
1416                 script = strrchr(url, '/');
1417                 if (script != url) { /* paranoia */
1418                         *script = '\0';
1419                         if (chdir(url + 1) != 0) {
1420                                 bb_perror_msg("chdir %s", url + 1);
1421                                 goto error_execing_cgi;
1422                         }
1423                         // not needed: *script = '/';
1424                 }
1425                 script++;
1426
1427                 /* set argv[0] to name without path */
1428                 argv[0] = script;
1429                 argv[1] = NULL;
1430
1431 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1432                 {
1433                         char *suffix = strrchr(script, '.');
1434
1435                         if (suffix) {
1436                                 Htaccess *cur;
1437                                 for (cur = script_i; cur; cur = cur->next) {
1438                                         if (strcmp(cur->before_colon + 1, suffix) == 0) {
1439                                                 /* found interpreter name */
1440                                                 argv[0] = cur->after_colon;
1441                                                 argv[1] = script;
1442                                                 argv[2] = NULL;
1443                                                 break;
1444                                         }
1445                                 }
1446                         }
1447                 }
1448 #endif
1449                 /* restore default signal dispositions for CGI process */
1450                 bb_signals(0
1451                         | (1 << SIGCHLD)
1452                         | (1 << SIGPIPE)
1453                         | (1 << SIGHUP)
1454                         , SIG_DFL);
1455
1456                 /* _NOT_ execvp. We do not search PATH. argv[0] is a filename
1457                  * without any dir components and will only match a file
1458                  * in the current directory */
1459                 execv(argv[0], argv);
1460                 if (verbose)
1461                         bb_perror_msg("exec %s", argv[0]);
1462  error_execing_cgi:
1463                 /* send to stdout
1464                  * (we are CGI here, our stdout is pumped to the net) */
1465                 send_headers_and_exit(HTTP_NOT_FOUND);
1466         } /* end child */
1467
1468         /* Parent process */
1469
1470         /* Restore variables possibly changed by child */
1471         xfunc_error_retval = 0;
1472
1473         /* Pump data */
1474         close(fromCgi.wr);
1475         close(toCgi.rd);
1476         cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len);
1477 }
1478
1479 #endif          /* FEATURE_HTTPD_CGI */
1480
1481 /*
1482  * Send a file response to a HTTP request, and exit
1483  *
1484  * Parameters:
1485  * const char *url  The requested URL (with leading /).
1486  * what             What to send (headers/body/both).
1487  */
1488 static NOINLINE void send_file_and_exit(const char *url, int what)
1489 {
1490         static const char *const suffixTable[] = {
1491         /* Warning: shorter equivalent suffix in one line must be first */
1492                 ".htm.html", "text/html",
1493                 ".jpg.jpeg", "image/jpeg",
1494                 ".gif",      "image/gif",
1495                 ".png",      "image/png",
1496                 ".txt.h.c.cc.cpp", "text/plain",
1497                 ".css",      "text/css",
1498                 ".wav",      "audio/wav",
1499                 ".avi",      "video/x-msvideo",
1500                 ".qt.mov",   "video/quicktime",
1501                 ".mpe.mpeg", "video/mpeg",
1502                 ".mid.midi", "audio/midi",
1503                 ".mp3",      "audio/mpeg",
1504 #if 0                        /* unpopular */
1505                 ".au",       "audio/basic",
1506                 ".pac",      "application/x-ns-proxy-autoconfig",
1507                 ".vrml.wrl", "model/vrml",
1508 #endif
1509                 NULL
1510         };
1511
1512         char *suffix;
1513         int fd;
1514         const char *const *table;
1515         const char *try_suffix;
1516         ssize_t count;
1517
1518         fd = open(url, O_RDONLY);
1519         if (fd < 0) {
1520                 if (DEBUG)
1521                         bb_perror_msg("can't open '%s'", url);
1522                 /* Error pages are sent by using send_file_and_exit(SEND_BODY).
1523                  * IOW: it is unsafe to call send_headers_and_exit
1524                  * if what is SEND_BODY! Can recurse! */
1525                 if (what != SEND_BODY)
1526                         send_headers_and_exit(HTTP_NOT_FOUND);
1527                 log_and_exit();
1528         }
1529
1530         if (DEBUG)
1531                 bb_error_msg("sending file '%s' content-type: %s",
1532                         url, found_mime_type);
1533
1534         /* If you want to know about EPIPE below
1535          * (happens if you abort downloads from local httpd): */
1536         signal(SIGPIPE, SIG_IGN);
1537
1538         suffix = strrchr(url, '.');
1539
1540         /* If not found, set default as "application/octet-stream";  */
1541         found_mime_type = "application/octet-stream";
1542         if (suffix) {
1543                 Htaccess *cur;
1544                 for (table = suffixTable; *table; table += 2) {
1545                         try_suffix = strstr(table[0], suffix);
1546                         if (try_suffix) {
1547                                 try_suffix += strlen(suffix);
1548                                 if (*try_suffix == '\0' || *try_suffix == '.') {
1549                                         found_mime_type = table[1];
1550                                         break;
1551                                 }
1552                         }
1553                 }
1554                 for (cur = mime_a; cur; cur = cur->next) {
1555                         if (strcmp(cur->before_colon, suffix) == 0) {
1556                                 found_mime_type = cur->after_colon;
1557                                 break;
1558                         }
1559                 }
1560         }
1561 #if ENABLE_FEATURE_HTTPD_RANGES
1562         if (what == SEND_BODY)
1563                 range_start = 0; /* err pages and ranges don't mix */
1564         range_len = MAXINT(off_t);
1565         if (range_start) {
1566                 if (!range_end) {
1567                         range_end = file_size - 1;
1568                 }
1569                 if (range_end < range_start
1570                  || lseek(fd, range_start, SEEK_SET) != range_start
1571                 ) {
1572                         lseek(fd, 0, SEEK_SET);
1573                         range_start = 0;
1574                 } else {
1575                         range_len = range_end - range_start + 1;
1576                         send_headers(HTTP_PARTIAL_CONTENT);
1577                         what = SEND_BODY;
1578                 }
1579         }
1580 #endif
1581         if (what & SEND_HEADERS)
1582                 send_headers(HTTP_OK);
1583 #if ENABLE_FEATURE_HTTPD_USE_SENDFILE
1584         {
1585                 off_t offset = range_start;
1586                 while (1) {
1587                         /* sz is rounded down to 64k */
1588                         ssize_t sz = MAXINT(ssize_t) - 0xffff;
1589                         IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;)
1590                         count = sendfile(STDOUT_FILENO, fd, &offset, sz);
1591                         if (count < 0) {
1592                                 if (offset == range_start)
1593                                         break; /* fall back to read/write loop */
1594                                 goto fin;
1595                         }
1596                         IF_FEATURE_HTTPD_RANGES(range_len -= sz;)
1597                         if (count == 0 || range_len == 0)
1598                                 log_and_exit();
1599                 }
1600         }
1601 #endif
1602         while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) {
1603                 ssize_t n;
1604                 IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;)
1605                 n = full_write(STDOUT_FILENO, iobuf, count);
1606                 if (count != n)
1607                         break;
1608                 IF_FEATURE_HTTPD_RANGES(range_len -= count;)
1609                 if (range_len == 0)
1610                         break;
1611         }
1612         if (count < 0) {
1613  IF_FEATURE_HTTPD_USE_SENDFILE(fin:)
1614                 if (verbose > 1)
1615                         bb_perror_msg("error");
1616         }
1617         log_and_exit();
1618 }
1619
1620 static int checkPermIP(void)
1621 {
1622         Htaccess_IP *cur;
1623
1624         for (cur = ip_a_d; cur; cur = cur->next) {
1625 #if DEBUG
1626                 fprintf(stderr,
1627                         "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n",
1628                         rmt_ip_str,
1629                         (unsigned char)(cur->ip >> 24),
1630                         (unsigned char)(cur->ip >> 16),
1631                         (unsigned char)(cur->ip >> 8),
1632                         (unsigned char)(cur->ip),
1633                         (unsigned char)(cur->mask >> 24),
1634                         (unsigned char)(cur->mask >> 16),
1635                         (unsigned char)(cur->mask >> 8),
1636                         (unsigned char)(cur->mask)
1637                 );
1638 #endif
1639                 if ((rmt_ip & cur->mask) == cur->ip)
1640                         return (cur->allow_deny == 'A'); /* A -> 1 */
1641         }
1642
1643         return !flg_deny_all; /* depends on whether we saw "D:*" */
1644 }
1645
1646 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1647 /*
1648  * Config file entries are of the form "/<path>:<user>:<passwd>".
1649  * If config file has no prefix match for path, access is allowed.
1650  *
1651  * path                 The file path
1652  * user_and_passwd      "user:passwd" to validate
1653  *
1654  * Returns 1 if user_and_passwd is OK.
1655  */
1656 static int check_user_passwd(const char *path, const char *user_and_passwd)
1657 {
1658         Htaccess *cur;
1659         const char *prev = NULL;
1660
1661         for (cur = g_auth; cur; cur = cur->next) {
1662                 const char *dir_prefix;
1663                 size_t len;
1664
1665                 dir_prefix = cur->before_colon;
1666
1667                 /* WHY? */
1668                 /* If already saw a match, don't accept other different matches */
1669                 if (prev && strcmp(prev, dir_prefix) != 0)
1670                         continue;
1671
1672                 if (DEBUG)
1673                         fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
1674
1675                 /* If it's not a prefix match, continue searching */
1676                 len = strlen(dir_prefix);
1677                 if (len != 1 /* dir_prefix "/" matches all, don't need to check */
1678                  && (strncmp(dir_prefix, path, len) != 0
1679                     || (path[len] != '/' && path[len] != '\0'))
1680                 ) {
1681                         continue;
1682                 }
1683
1684                 /* Path match found */
1685                 prev = dir_prefix;
1686
1687                 if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1688                         char *md5_passwd;
1689
1690                         md5_passwd = strchr(cur->after_colon, ':');
1691                         if (md5_passwd && md5_passwd[1] == '$' && md5_passwd[2] == '1'
1692                          && md5_passwd[3] == '$' && md5_passwd[4]
1693                         ) {
1694                                 char *encrypted;
1695                                 int r, user_len_p1;
1696
1697                                 md5_passwd++;
1698                                 user_len_p1 = md5_passwd - cur->after_colon;
1699                                 /* comparing "user:" */
1700                                 if (strncmp(cur->after_colon, user_and_passwd, user_len_p1) != 0) {
1701                                         continue;
1702                                 }
1703
1704                                 encrypted = pw_encrypt(
1705                                         user_and_passwd + user_len_p1 /* cleartext pwd from user */,
1706                                         md5_passwd /*salt */, 1 /* cleanup */);
1707                                 r = strcmp(encrypted, md5_passwd);
1708                                 free(encrypted);
1709                                 if (r == 0)
1710                                         goto set_remoteuser_var; /* Ok */
1711                                 continue;
1712                         }
1713                 }
1714
1715                 /* Comparing plaintext "user:pass" in one go */
1716                 if (strcmp(cur->after_colon, user_and_passwd) == 0) {
1717  set_remoteuser_var:
1718                         remoteuser = xstrndup(user_and_passwd,
1719                                         strchrnul(user_and_passwd, ':') - user_and_passwd);
1720                         return 1; /* Ok */
1721                 }
1722         } /* for */
1723
1724         /* 0(bad) if prev is set: matches were found but passwd was wrong */
1725         return (prev == NULL);
1726 }
1727 #endif  /* FEATURE_HTTPD_BASIC_AUTH */
1728
1729 #if ENABLE_FEATURE_HTTPD_PROXY
1730 static Htaccess_Proxy *find_proxy_entry(const char *url)
1731 {
1732         Htaccess_Proxy *p;
1733         for (p = proxy; p; p = p->next) {
1734                 if (strncmp(url, p->url_from, strlen(p->url_from)) == 0)
1735                         return p;
1736         }
1737         return NULL;
1738 }
1739 #endif
1740
1741 /*
1742  * Handle timeouts
1743  */
1744 static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN;
1745 static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM)
1746 {
1747         send_headers_and_exit(HTTP_REQUEST_TIMEOUT);
1748 }
1749
1750 /*
1751  * Handle an incoming http request and exit.
1752  */
1753 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN;
1754 static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
1755 {
1756         static const char request_GET[] ALIGN1 = "GET";
1757         struct stat sb;
1758         char *urlcopy;
1759         char *urlp;
1760         char *tptr;
1761 #if ENABLE_FEATURE_HTTPD_CGI
1762         static const char request_HEAD[] ALIGN1 = "HEAD";
1763         const char *prequest;
1764         char *cookie = NULL;
1765         char *content_type = NULL;
1766         unsigned long length = 0;
1767 #elif ENABLE_FEATURE_HTTPD_PROXY
1768 #define prequest request_GET
1769         unsigned long length = 0;
1770 #endif
1771 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1772         smallint authorized = -1;
1773 #endif
1774         smallint ip_allowed;
1775         char http_major_version;
1776 #if ENABLE_FEATURE_HTTPD_PROXY
1777         char http_minor_version;
1778         char *header_buf = header_buf; /* for gcc */
1779         char *header_ptr = header_ptr;
1780         Htaccess_Proxy *proxy_entry;
1781 #endif
1782
1783         /* Allocation of iobuf is postponed until now
1784          * (IOW, server process doesn't need to waste 8k) */
1785         iobuf = xmalloc(IOBUF_SIZE);
1786
1787         rmt_ip = 0;
1788         if (fromAddr->u.sa.sa_family == AF_INET) {
1789                 rmt_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr);
1790         }
1791 #if ENABLE_FEATURE_IPV6
1792         if (fromAddr->u.sa.sa_family == AF_INET6
1793          && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0
1794          && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0
1795          && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff)
1796                 rmt_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]);
1797 #endif
1798         if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) {
1799                 /* NB: can be NULL (user runs httpd -i by hand?) */
1800                 rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa);
1801         }
1802         if (verbose) {
1803                 /* this trick makes -v logging much simpler */
1804                 if (rmt_ip_str)
1805                         applet_name = rmt_ip_str;
1806                 if (verbose > 2)
1807                         bb_error_msg("connected");
1808         }
1809
1810         /* Install timeout handler. get_line() needs it. */
1811         signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit);
1812
1813         if (!get_line()) /* EOF or error or empty line */
1814                 send_headers_and_exit(HTTP_BAD_REQUEST);
1815
1816         /* Determine type of request (GET/POST) */
1817         urlp = strpbrk(iobuf, " \t");
1818         if (urlp == NULL)
1819                 send_headers_and_exit(HTTP_BAD_REQUEST);
1820         *urlp++ = '\0';
1821 #if ENABLE_FEATURE_HTTPD_CGI
1822         prequest = request_GET;
1823         if (strcasecmp(iobuf, prequest) != 0) {
1824                 prequest = request_HEAD;
1825                 if (strcasecmp(iobuf, prequest) != 0) {
1826                         prequest = "POST";
1827                         if (strcasecmp(iobuf, prequest) != 0)
1828                                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1829                 }
1830         }
1831 #else
1832         if (strcasecmp(iobuf, request_GET) != 0)
1833                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
1834 #endif
1835         urlp = skip_whitespace(urlp);
1836         if (urlp[0] != '/')
1837                 send_headers_and_exit(HTTP_BAD_REQUEST);
1838
1839         /* Find end of URL and parse HTTP version, if any */
1840         http_major_version = '0';
1841         IF_FEATURE_HTTPD_PROXY(http_minor_version = '0';)
1842         tptr = strchrnul(urlp, ' ');
1843         /* Is it " HTTP/"? */
1844         if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) {
1845                 http_major_version = tptr[6];
1846                 IF_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];)
1847         }
1848         *tptr = '\0';
1849
1850         /* Copy URL from after "GET "/"POST " to stack-allocated char[] */
1851         urlcopy = alloca((tptr - urlp) + 2 + strlen(index_page));
1852         /*if (urlcopy == NULL)
1853          *      send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/
1854         strcpy(urlcopy, urlp);
1855         /* NB: urlcopy ptr is never changed after this */
1856
1857         /* Extract url args if present */
1858         g_query = NULL;
1859         tptr = strchr(urlcopy, '?');
1860         if (tptr) {
1861                 *tptr++ = '\0';
1862                 g_query = tptr;
1863         }
1864
1865         /* Decode URL escape sequences */
1866         tptr = decodeString(urlcopy, 0);
1867         if (tptr == NULL)
1868                 send_headers_and_exit(HTTP_BAD_REQUEST);
1869         if (tptr == urlcopy + 1) {
1870                 /* '/' or NUL is encoded */
1871                 send_headers_and_exit(HTTP_NOT_FOUND);
1872         }
1873
1874         /* Canonicalize path */
1875         /* Algorithm stolen from libbb bb_simplify_path(),
1876          * but don't strdup, retain trailing slash, protect root */
1877         urlp = tptr = urlcopy;
1878         do {
1879                 if (*urlp == '/') {
1880                         /* skip duplicate (or initial) slash */
1881                         if (*tptr == '/') {
1882                                 continue;
1883                         }
1884                         if (*tptr == '.') {
1885                                 /* skip extra "/./" */
1886                                 if (tptr[1] == '/' || !tptr[1]) {
1887                                         continue;
1888                                 }
1889                                 /* "..": be careful */
1890                                 if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) {
1891                                         ++tptr;
1892                                         if (urlp == urlcopy) /* protect root */
1893                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1894                                         while (*--urlp != '/') /* omit previous dir */;
1895                                                 continue;
1896                                 }
1897                         }
1898                 }
1899                 *++urlp = *tptr;
1900         } while (*++tptr);
1901         *++urlp = '\0';       /* terminate after last character */
1902
1903         /* If URL is a directory, add '/' */
1904         if (urlp[-1] != '/') {
1905                 if (is_directory(urlcopy + 1, 1, &sb)) {
1906                         found_moved_temporarily = urlcopy;
1907                 }
1908         }
1909
1910         /* Log it */
1911         if (verbose > 1)
1912                 bb_error_msg("url:%s", urlcopy);
1913
1914         tptr = urlcopy;
1915         ip_allowed = checkPermIP();
1916         while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) {
1917                 /* have path1/path2 */
1918                 *tptr = '\0';
1919                 if (is_directory(urlcopy + 1, 1, &sb)) {
1920                         /* may have subdir config */
1921                         parse_conf(urlcopy + 1, SUBDIR_PARSE);
1922                         ip_allowed = checkPermIP();
1923                 }
1924                 *tptr = '/';
1925         }
1926
1927 #if ENABLE_FEATURE_HTTPD_PROXY
1928         proxy_entry = find_proxy_entry(urlcopy);
1929         if (proxy_entry)
1930                 header_buf = header_ptr = xmalloc(IOBUF_SIZE);
1931 #endif
1932
1933         if (http_major_version >= '0') {
1934                 /* Request was with "... HTTP/nXXX", and n >= 0 */
1935
1936                 /* Read until blank line for HTTP version specified, else parse immediate */
1937                 while (1) {
1938                         if (!get_line())
1939                                 break; /* EOF or error or empty line */
1940                         if (DEBUG)
1941                                 bb_error_msg("header: '%s'", iobuf);
1942
1943 #if ENABLE_FEATURE_HTTPD_PROXY
1944                         /* We need 2 more bytes for yet another "\r\n" -
1945                          * see near fdprintf(proxy_fd...) further below */
1946                         if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) {
1947                                 int len = strlen(iobuf);
1948                                 if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4)
1949                                         len = IOBUF_SIZE - (header_ptr - header_buf) - 4;
1950                                 memcpy(header_ptr, iobuf, len);
1951                                 header_ptr += len;
1952                                 header_ptr[0] = '\r';
1953                                 header_ptr[1] = '\n';
1954                                 header_ptr += 2;
1955                         }
1956 #endif
1957
1958 #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY
1959                         /* Try and do our best to parse more lines */
1960                         if ((STRNCASECMP(iobuf, "Content-length:") == 0)) {
1961                                 /* extra read only for POST */
1962                                 if (prequest != request_GET
1963 #if ENABLE_FEATURE_HTTPD_CGI
1964                                  && prequest != request_HEAD
1965 #endif
1966                                 ) {
1967                                         tptr = skip_whitespace(iobuf + sizeof("Content-length:") - 1);
1968                                         if (!tptr[0])
1969                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1970                                         /* not using strtoul: it ignores leading minus! */
1971                                         length = bb_strtou(tptr, NULL, 10);
1972                                         /* length is "ulong", but we need to pass it to int later */
1973                                         if (errno || length > INT_MAX)
1974                                                 send_headers_and_exit(HTTP_BAD_REQUEST);
1975                                 }
1976                         }
1977 #endif
1978 #if ENABLE_FEATURE_HTTPD_CGI
1979                         else if (STRNCASECMP(iobuf, "Cookie:") == 0) {
1980                                 cookie = xstrdup(skip_whitespace(iobuf + sizeof("Cookie:")-1));
1981                         } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) {
1982                                 content_type = xstrdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1));
1983                         } else if (STRNCASECMP(iobuf, "Referer:") == 0) {
1984                                 referer = xstrdup(skip_whitespace(iobuf + sizeof("Referer:")-1));
1985                         } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) {
1986                                 user_agent = xstrdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1));
1987                         } else if (STRNCASECMP(iobuf, "Host:") == 0) {
1988                                 host = xstrdup(skip_whitespace(iobuf + sizeof("Host:")-1));
1989                         } else if (STRNCASECMP(iobuf, "Accept:") == 0) {
1990                                 http_accept = xstrdup(skip_whitespace(iobuf + sizeof("Accept:")-1));
1991                         } else if (STRNCASECMP(iobuf, "Accept-Language:") == 0) {
1992                                 http_accept_language = xstrdup(skip_whitespace(iobuf + sizeof("Accept-Language:")-1));
1993                         }
1994 #endif
1995 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1996                         if (STRNCASECMP(iobuf, "Authorization:") == 0) {
1997                                 /* We only allow Basic credentials.
1998                                  * It shows up as "Authorization: Basic <user>:<passwd>" where
1999                                  * "<user>:<passwd>" is base64 encoded.
2000                                  */
2001                                 tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
2002                                 if (STRNCASECMP(tptr, "Basic") != 0)
2003                                         continue;
2004                                 tptr += sizeof("Basic")-1;
2005                                 /* decodeBase64() skips whitespace itself */
2006                                 decodeBase64(tptr);
2007                                 authorized = check_user_passwd(urlcopy, tptr);
2008                         }
2009 #endif
2010 #if ENABLE_FEATURE_HTTPD_RANGES
2011                         if (STRNCASECMP(iobuf, "Range:") == 0) {
2012                                 /* We know only bytes=NNN-[MMM] */
2013                                 char *s = skip_whitespace(iobuf + sizeof("Range:")-1);
2014                                 if (strncmp(s, "bytes=", 6) == 0) {
2015                                         s += sizeof("bytes=")-1;
2016                                         range_start = BB_STRTOOFF(s, &s, 10);
2017                                         if (s[0] != '-' || range_start < 0) {
2018                                                 range_start = 0;
2019                                         } else if (s[1]) {
2020                                                 range_end = BB_STRTOOFF(s+1, NULL, 10);
2021                                                 if (errno || range_end < range_start)
2022                                                         range_start = 0;
2023                                         }
2024                                 }
2025                         }
2026 #endif
2027                 } /* while extra header reading */
2028         }
2029
2030         /* We are done reading headers, disable peer timeout */
2031         alarm(0);
2032
2033         if (strcmp(bb_basename(urlcopy), HTTPD_CONF) == 0 || !ip_allowed) {
2034                 /* protect listing [/path]/httpd.conf or IP deny */
2035                 send_headers_and_exit(HTTP_FORBIDDEN);
2036         }
2037
2038 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
2039         /* Case: no "Authorization:" was seen, but page does require passwd.
2040          * Check that with dummy user:pass */
2041         if (authorized < 0)
2042                 authorized = check_user_passwd(urlcopy, ":");
2043         if (!authorized)
2044                 send_headers_and_exit(HTTP_UNAUTHORIZED);
2045 #endif
2046
2047         if (found_moved_temporarily) {
2048                 send_headers_and_exit(HTTP_MOVED_TEMPORARILY);
2049         }
2050
2051 #if ENABLE_FEATURE_HTTPD_PROXY
2052         if (proxy_entry != NULL) {
2053                 int proxy_fd;
2054                 len_and_sockaddr *lsa;
2055
2056                 proxy_fd = socket(AF_INET, SOCK_STREAM, 0);
2057                 if (proxy_fd < 0)
2058                         send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2059                 lsa = host2sockaddr(proxy_entry->host_port, 80);
2060                 if (lsa == NULL)
2061                         send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2062                 if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0)
2063                         send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);
2064                 fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n",
2065                                 prequest, /* GET or POST */
2066                                 proxy_entry->url_to, /* url part 1 */
2067                                 urlcopy + strlen(proxy_entry->url_from), /* url part 2 */
2068                                 (g_query ? "?" : ""), /* "?" (maybe) */
2069                                 (g_query ? g_query : ""), /* query string (maybe) */
2070                                 http_major_version, http_minor_version);
2071                 header_ptr[0] = '\r';
2072                 header_ptr[1] = '\n';
2073                 header_ptr += 2;
2074                 write(proxy_fd, header_buf, header_ptr - header_buf);
2075                 free(header_buf); /* on the order of 8k, free it */
2076                 /* cgi_io_loop_and_exit needs to have two disctinct fds */
2077                 cgi_io_loop_and_exit(proxy_fd, dup(proxy_fd), length);
2078         }
2079 #endif
2080
2081         tptr = urlcopy + 1;      /* skip first '/' */
2082
2083 #if ENABLE_FEATURE_HTTPD_CGI
2084         if (strncmp(tptr, "cgi-bin/", 8) == 0) {
2085                 if (tptr[8] == '\0') {
2086                         /* protect listing "cgi-bin/" */
2087                         send_headers_and_exit(HTTP_FORBIDDEN);
2088                 }
2089                 send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2090         }
2091 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
2092         {
2093                 char *suffix = strrchr(tptr, '.');
2094                 if (suffix) {
2095                         Htaccess *cur;
2096                         for (cur = script_i; cur; cur = cur->next) {
2097                                 if (strcmp(cur->before_colon + 1, suffix) == 0) {
2098                                         send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
2099                                 }
2100                         }
2101                 }
2102         }
2103 #endif
2104         if (prequest != request_GET && prequest != request_HEAD) {
2105                 send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
2106         }
2107 #endif  /* FEATURE_HTTPD_CGI */
2108
2109         if (urlp[-1] == '/')
2110                 strcpy(urlp, index_page);
2111         if (stat(tptr, &sb) == 0) {
2112                 file_size = sb.st_size;
2113                 last_mod = sb.st_mtime;
2114         }
2115 #if ENABLE_FEATURE_HTTPD_CGI
2116         else if (urlp[-1] == '/') {
2117                 /* It's a dir URL and there is no index.html
2118                  * Try cgi-bin/index.cgi */
2119                 if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) {
2120                         urlp[0] = '\0';
2121                         g_query = urlcopy;
2122                         send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
2123                 }
2124         }
2125 #endif
2126         /* else {
2127          *      fall through to send_file, it errors out if open fails
2128          * }
2129          */
2130
2131         send_file_and_exit(tptr,
2132 #if ENABLE_FEATURE_HTTPD_CGI
2133                 (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
2134 #else
2135                 SEND_HEADERS_AND_BODY
2136 #endif
2137         );
2138 }
2139
2140 /*
2141  * The main http server function.
2142  * Given a socket, listen for new connections and farm out
2143  * the processing as a [v]forked process.
2144  * Never returns.
2145  */
2146 #if BB_MMU
2147 static void mini_httpd(int server_socket) NORETURN;
2148 static void mini_httpd(int server_socket)
2149 {
2150         /* NB: it's best to not use xfuncs in this loop before fork().
2151          * Otherwise server may die on transient errors (temporary
2152          * out-of-memory condition, etc), which is Bad(tm).
2153          * Try to do any dangerous calls after fork.
2154          */
2155         while (1) {
2156                 int n;
2157                 len_and_sockaddr fromAddr;
2158
2159                 /* Wait for connections... */
2160                 fromAddr.len = LSA_SIZEOF_SA;
2161                 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2162
2163                 if (n < 0)
2164                         continue;
2165                 /* set the KEEPALIVE option to cull dead connections */
2166                 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2167
2168                 if (fork() == 0) {
2169                         /* child */
2170                         /* Do not reload config on HUP */
2171                         signal(SIGHUP, SIG_IGN);
2172                         close(server_socket);
2173                         xmove_fd(n, 0);
2174                         xdup2(0, 1);
2175
2176                         handle_incoming_and_exit(&fromAddr);
2177                 }
2178                 /* parent, or fork failed */
2179                 close(n);
2180         } /* while (1) */
2181         /* never reached */
2182 }
2183 #else
2184 static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN;
2185 static void mini_httpd_nommu(int server_socket, int argc, char **argv)
2186 {
2187         char *argv_copy[argc + 2];
2188
2189         argv_copy[0] = argv[0];
2190         argv_copy[1] = (char*)"-i";
2191         memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0]));
2192
2193         /* NB: it's best to not use xfuncs in this loop before vfork().
2194          * Otherwise server may die on transient errors (temporary
2195          * out-of-memory condition, etc), which is Bad(tm).
2196          * Try to do any dangerous calls after fork.
2197          */
2198         while (1) {
2199                 int n;
2200                 len_and_sockaddr fromAddr;
2201
2202                 /* Wait for connections... */
2203                 fromAddr.len = LSA_SIZEOF_SA;
2204                 n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len);
2205
2206                 if (n < 0)
2207                         continue;
2208                 /* set the KEEPALIVE option to cull dead connections */
2209                 setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1));
2210
2211                 if (vfork() == 0) {
2212                         /* child */
2213                         /* Do not reload config on HUP */
2214                         signal(SIGHUP, SIG_IGN);
2215                         close(server_socket);
2216                         xmove_fd(n, 0);
2217                         xdup2(0, 1);
2218
2219                         /* Run a copy of ourself in inetd mode */
2220                         re_exec(argv_copy);
2221                 }
2222                 /* parent, or vfork failed */
2223                 close(n);
2224         } /* while (1) */
2225         /* never reached */
2226 }
2227 #endif
2228
2229 /*
2230  * Process a HTTP connection on stdin/out.
2231  * Never returns.
2232  */
2233 static void mini_httpd_inetd(void) NORETURN;
2234 static void mini_httpd_inetd(void)
2235 {
2236         len_and_sockaddr fromAddr;
2237
2238         memset(&fromAddr, 0, sizeof(fromAddr));
2239         fromAddr.len = LSA_SIZEOF_SA;
2240         /* NB: can fail if user runs it by hand and types in http cmds */
2241         getpeername(0, &fromAddr.u.sa, &fromAddr.len);
2242         handle_incoming_and_exit(&fromAddr);
2243 }
2244
2245 static void sighup_handler(int sig UNUSED_PARAM)
2246 {
2247         parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE);
2248 }
2249
2250 enum {
2251         c_opt_config_file = 0,
2252         d_opt_decode_url,
2253         h_opt_home_httpd,
2254         IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
2255         IF_FEATURE_HTTPD_BASIC_AUTH(    r_opt_realm     ,)
2256         IF_FEATURE_HTTPD_AUTH_MD5(      m_opt_md5       ,)
2257         IF_FEATURE_HTTPD_SETUID(        u_opt_setuid    ,)
2258         p_opt_port      ,
2259         p_opt_inetd     ,
2260         p_opt_foreground,
2261         p_opt_verbose   ,
2262         OPT_CONFIG_FILE = 1 << c_opt_config_file,
2263         OPT_DECODE_URL  = 1 << d_opt_decode_url,
2264         OPT_HOME_HTTPD  = 1 << h_opt_home_httpd,
2265         OPT_ENCODE_URL  = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
2266         OPT_REALM       = IF_FEATURE_HTTPD_BASIC_AUTH(    (1 << r_opt_realm     )) + 0,
2267         OPT_MD5         = IF_FEATURE_HTTPD_AUTH_MD5(      (1 << m_opt_md5       )) + 0,
2268         OPT_SETUID      = IF_FEATURE_HTTPD_SETUID(        (1 << u_opt_setuid    )) + 0,
2269         OPT_PORT        = 1 << p_opt_port,
2270         OPT_INETD       = 1 << p_opt_inetd,
2271         OPT_FOREGROUND  = 1 << p_opt_foreground,
2272         OPT_VERBOSE     = 1 << p_opt_verbose,
2273 };
2274
2275
2276 int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
2277 int httpd_main(int argc UNUSED_PARAM, char **argv)
2278 {
2279         int server_socket = server_socket; /* for gcc */
2280         unsigned opt;
2281         char *url_for_decode;
2282         IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
2283         IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
2284         IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
2285         IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
2286
2287         INIT_G();
2288
2289 #if ENABLE_LOCALE_SUPPORT
2290         /* Undo busybox.c: we want to speak English in http (dates etc) */
2291         setlocale(LC_TIME, "C");
2292 #endif
2293
2294         home_httpd = xrealloc_getcwd_or_warn(NULL);
2295         /* -v counts, -i implies -f */
2296         opt_complementary = "vv:if";
2297         /* We do not "absolutize" path given by -h (home) opt.
2298          * If user gives relative path in -h,
2299          * $SCRIPT_FILENAME will not be set. */
2300         opt = getopt32(argv, "c:d:h:"
2301                         IF_FEATURE_HTTPD_ENCODE_URL_STR("e:")
2302                         IF_FEATURE_HTTPD_BASIC_AUTH("r:")
2303                         IF_FEATURE_HTTPD_AUTH_MD5("m:")
2304                         IF_FEATURE_HTTPD_SETUID("u:")
2305                         "p:ifv",
2306                         &opt_c_configFile, &url_for_decode, &home_httpd
2307                         IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
2308                         IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm)
2309                         IF_FEATURE_HTTPD_AUTH_MD5(, &pass)
2310                         IF_FEATURE_HTTPD_SETUID(, &s_ugid)
2311                         , &bind_addr_or_port
2312                         , &verbose
2313                 );
2314         if (opt & OPT_DECODE_URL) {
2315                 fputs(decodeString(url_for_decode, 1), stdout);
2316                 return 0;
2317         }
2318 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
2319         if (opt & OPT_ENCODE_URL) {
2320                 fputs(encodeString(url_for_encode), stdout);
2321                 return 0;
2322         }
2323 #endif
2324 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
2325         if (opt & OPT_MD5) {
2326                 puts(pw_encrypt(pass, "$1$", 1));
2327                 return 0;
2328         }
2329 #endif
2330 #if ENABLE_FEATURE_HTTPD_SETUID
2331         if (opt & OPT_SETUID) {
2332                 xget_uidgid(&ugid, s_ugid);
2333         }
2334 #endif
2335
2336 #if !BB_MMU
2337         if (!(opt & OPT_FOREGROUND)) {
2338                 bb_daemonize_or_rexec(0, argv); /* don't change current directory */
2339         }
2340 #endif
2341
2342         xchdir(home_httpd);
2343         if (!(opt & OPT_INETD)) {
2344                 signal(SIGCHLD, SIG_IGN);
2345                 server_socket = openServer();
2346 #if ENABLE_FEATURE_HTTPD_SETUID
2347                 /* drop privileges */
2348                 if (opt & OPT_SETUID) {
2349                         if (ugid.gid != (gid_t)-1) {
2350                                 if (setgroups(1, &ugid.gid) == -1)
2351                                         bb_perror_msg_and_die("setgroups");
2352                                 xsetgid(ugid.gid);
2353                         }
2354                         xsetuid(ugid.uid);
2355                 }
2356 #endif
2357         }
2358
2359 #if 0
2360         /* User can do it himself: 'env - PATH="$PATH" httpd'
2361          * We don't do it because we don't want to screw users
2362          * which want to do
2363          * 'env - VAR1=val1 VAR2=val2 httpd'
2364          * and have VAR1 and VAR2 values visible in their CGIs.
2365          * Besides, it is also smaller. */
2366         {
2367                 char *p = getenv("PATH");
2368                 /* env strings themself are not freed, no need to xstrdup(p): */
2369                 clearenv();
2370                 if (p)
2371                         putenv(p - 5);
2372 //              if (!(opt & OPT_INETD))
2373 //                      setenv_long("SERVER_PORT", ???);
2374         }
2375 #endif
2376
2377         parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE);
2378         if (!(opt & OPT_INETD))
2379                 signal(SIGHUP, sighup_handler);
2380
2381         xfunc_error_retval = 0;
2382         if (opt & OPT_INETD)
2383                 mini_httpd_inetd();
2384 #if BB_MMU
2385         if (!(opt & OPT_FOREGROUND))
2386                 bb_daemonize(0); /* don't change current directory */
2387         mini_httpd(server_socket); /* never returns */
2388 #else
2389         mini_httpd_nommu(server_socket, argc, argv); /* never returns */
2390 #endif
2391         /* return 0; */
2392 }