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 contains "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  * The server can also be invoked as a url arg decoder and html text encoder
  28  * as follows:
  29  *  foo=`httpd -d $foo`           # decode "Hello%20World" as "Hello World"
  30  *  bar=`httpd -e "<Hello World>"`  # encode as "&#60Hello&#32World&#62"
  31  * Note that url encoding for arguments is not the same as html encoding for
  32  * presentation.  -d decodes a url-encoded argument while -e encodes in html
  33  * for page display.
  34  *
  35  * httpd.conf has the following format:
  36  *
  37  * A:172.20.         # Allow address from 172.20.0.0/16
  38  * A:10.0.0.0/25     # Allow any address from 10.0.0.0-10.0.0.127
  39  * A:10.0.0.0/255.255.255.128  # Allow any address that previous set
  40  * A:127.0.0.1       # Allow local loopback connections
  41  * D:*               # Deny from other IP connections
  42  * /cgi-bin:foo:bar  # Require user foo, pwd bar on urls starting with /cgi-bin/
  43  * /adm:admin:setup  # Require user admin, pwd setup on urls starting with /adm/
  44  * /adm:toor:PaSsWd  # or user toor, pwd PaSsWd on urls starting with /adm/
  45  * .au:audio/basic   # additional mime type for audio.au files
  46  * *.php:/path/php   # running cgi.php scripts through an interpreter
  47  *
  48  * A/D may be as a/d or allow/deny - first char case insensitive
  49  * Deny IP rules take precedence over allow rules.
  50  *
  51  *
  52  * The Deny/Allow IP logic:
  53  *
  54  *  - Default is to allow all.  No addresses are denied unless
  55  *         denied with a D: rule.
  56  *  - Order of Deny/Allow rules is significant
  57  *  - Deny rules take precedence over allow rules.
  58  *  - If a deny all rule (D:*) is used it acts as a catch-all for unmatched
  59  *       addresses.
  60  *  - Specification of Allow all (A:*) is a no-op
  61  *
  62  * Example:
  63  *   1. Allow only specified addresses
  64  *     A:172.20          # Allow any address that begins with 172.20.
  65  *     A:10.10.          # Allow any address that begins with 10.10.
  66  *     A:127.0.0.1       # Allow local loopback connections
  67  *     D:*               # Deny from other IP connections
  68  *
  69  *   2. Only deny specified addresses
  70  *     D:1.2.3.        # deny from 1.2.3.0 - 1.2.3.255
  71  *     D:2.3.4.        # deny from 2.3.4.0 - 2.3.4.255
  72  *     A:*             # (optional line added for clarity)
  73  *
  74  * If a sub directory contains a config file it is parsed and merged with
  75  * any existing settings as if it was appended to the original configuration.
  76  *
  77  * subdir paths are relative to the containing subdir and thus cannot
  78  * affect the parent rules.
  79  *
  80  * Note that since the sub dir is parsed in the forked thread servicing the
  81  * subdir http request, any merge is discarded when the process exits.  As a
  82  * result, the subdir settings only have a lifetime of a single request.
  83  *
  84  *
  85  * If -c is not set, an attempt will be made to open the default
  86  * root configuration file.  If -c is set and the file is not found, the
  87  * server exits with an error.
  88  *
  89 */
  90
  91
  92 #include "busybox.h"
  93
  94
  95 static const char httpdVersion[] = "busybox httpd/1.35 6-Oct-2004";
  96 static const char default_path_httpd_conf[] = "/etc";
  97 static const char httpd_conf[] = "httpd.conf";
  98 static const char home[] = "./";
  99
 100 #if ENABLE_LFS
 101 # define cont_l_fmt "%lld"
 102 # define cont_l_type (long long)
 103 #else
 104 # define cont_l_fmt "%ld"
 105 # define cont_l_type (long)
 106 #endif
 107
 108 #define TIMEOUT 60
 109
 110 // Note: busybox xfuncs are not used because we want the server to keep running
 111 //       if something bad happens due to a malformed user request.
 112 //       As a result, all memory allocation after daemonize
 113 //       is checked rigorously
 114
 115 //#define DEBUG 1
 116
 117 #ifndef DEBUG
 118 # define DEBUG 0
 119 #endif
 120
 121 #define MAX_MEMORY_BUFF 8192    /* IO buffer */
 122
 123 typedef struct HT_ACCESS {
 124         char *after_colon;
 125         struct HT_ACCESS *next;
 126         char before_colon[1];         /* really bigger, must last */
 127 } Htaccess;
 128
 129 typedef struct HT_ACCESS_IP {
 130         unsigned int ip;
 131         unsigned int mask;
 132         int allow_deny;
 133         struct HT_ACCESS_IP *next;
 134 } Htaccess_IP;
 135
 136 typedef struct {
 137         char buf[MAX_MEMORY_BUFF];
 138
 139         USE_FEATURE_HTTPD_BASIC_AUTH(const char *realm;)
 140         USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
 141
 142         const char *query;
 143
 144         USE_FEATURE_HTTPD_CGI(char *referer;)
 145
 146         const char *configFile;
 147
 148         unsigned int rmt_ip;
 149 #if ENABLE_FEATURE_HTTPD_CGI || DEBUG
 150         char rmt_ip_str[16];     /* for set env REMOTE_ADDR */
 151 #endif
 152         unsigned port;           /* server initial port and for
 153                                                       set env REMOTE_PORT */
 154         union HTTPD_FOUND {
 155                 const char *found_mime_type;
 156                 const char *found_moved_temporarily;
 157         } httpd_found;
 158
 159         off_t ContentLength;          /* -1 - unknown */
 160         time_t last_mod;
 161
 162         Htaccess_IP *ip_a_d;          /* config allow/deny lines */
 163         int flg_deny_all;
 164 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 165         Htaccess *auth;               /* config user:password lines */
 166 #endif
 167 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 168         Htaccess *mime_a;             /* config mime types */
 169 #endif
 170
 171 #if ENABLE_FEATURE_HTTPD_WITHOUT_INETD
 172         int accepted_socket;
 173 # define a_c_r config->accepted_socket
 174 # define a_c_w config->accepted_socket
 175 #else
 176 # define a_c_r 0
 177 # define a_c_w 1
 178 #endif
 179         volatile int alarm_signaled;
 180
 181 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 182         Htaccess *script_i;           /* config script interpreters */
 183 #endif
 184 } HttpdConfig;
 185
 186 static HttpdConfig *config;
 187
 188 static const char request_GET[] = "GET";    /* size algorithmic optimize */
 189
 190 static const char* const suffixTable [] = {
 191 /* Warning: shorted equivalent suffix in one line must be first */
 192         ".htm.html", "text/html",
 193         ".jpg.jpeg", "image/jpeg",
 194         ".gif", "image/gif",
 195         ".png", "image/png",
 196         ".txt.h.c.cc.cpp", "text/plain",
 197         ".css", "text/css",
 198         ".wav", "audio/wav",
 199         ".avi", "video/x-msvideo",
 200         ".qt.mov", "video/quicktime",
 201         ".mpe.mpeg", "video/mpeg",
 202         ".mid.midi", "audio/midi",
 203         ".mp3", "audio/mpeg",
 204 #if 0                        /* unpopular */
 205         ".au", "audio/basic",
 206         ".pac", "application/x-ns-proxy-autoconfig",
 207         ".vrml.wrl", "model/vrml",
 208 #endif
 209         0, "application/octet-stream" /* default */
 210 };
 211
 212 typedef enum {
 213         HTTP_OK = 200,
 214         HTTP_MOVED_TEMPORARILY = 302,
 215         HTTP_BAD_REQUEST = 400,       /* malformed syntax */
 216         HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
 217         HTTP_NOT_FOUND = 404,
 218         HTTP_FORBIDDEN = 403,
 219         HTTP_REQUEST_TIMEOUT = 408,
 220         HTTP_NOT_IMPLEMENTED = 501,   /* used for unrecognized requests */
 221         HTTP_INTERNAL_SERVER_ERROR = 500,
 222 #if 0 /* future use */
 223         HTTP_CONTINUE = 100,
 224         HTTP_SWITCHING_PROTOCOLS = 101,
 225         HTTP_CREATED = 201,
 226         HTTP_ACCEPTED = 202,
 227         HTTP_NON_AUTHORITATIVE_INFO = 203,
 228         HTTP_NO_CONTENT = 204,
 229         HTTP_MULTIPLE_CHOICES = 300,
 230         HTTP_MOVED_PERMANENTLY = 301,
 231         HTTP_NOT_MODIFIED = 304,
 232         HTTP_PAYMENT_REQUIRED = 402,
 233         HTTP_BAD_GATEWAY = 502,
 234         HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
 235         HTTP_RESPONSE_SETSIZE = 0xffffffff
 236 #endif
 237 } HttpResponseNum;
 238
 239 typedef struct {
 240         HttpResponseNum type;
 241         const char *name;
 242         const char *info;
 243 } HttpEnumString;
 244
 245 static const HttpEnumString httpResponseNames[] = {
 246         { HTTP_OK, "OK", NULL },
 247         { HTTP_MOVED_TEMPORARILY, "Found", "Directories must end with a slash." },
 248         { HTTP_REQUEST_TIMEOUT, "Request Timeout",
 249                 "No request appeared within a reasonable time period." },
 250         { HTTP_NOT_IMPLEMENTED, "Not Implemented",
 251                 "The requested method is not recognized by this server." },
 252 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 253         { HTTP_UNAUTHORIZED, "Unauthorized", "" },
 254 #endif
 255         { HTTP_NOT_FOUND, "Not Found",
 256                 "The requested URL was not found on this server." },
 257         { HTTP_BAD_REQUEST, "Bad Request", "Unsupported method." },
 258         { HTTP_FORBIDDEN, "Forbidden", "" },
 259         { HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error",
 260                 "Internal Server Error" },
 261 #if 0                               /* not implemented */
 262         { HTTP_CREATED, "Created" },
 263         { HTTP_ACCEPTED, "Accepted" },
 264         { HTTP_NO_CONTENT, "No Content" },
 265         { HTTP_MULTIPLE_CHOICES, "Multiple Choices" },
 266         { HTTP_MOVED_PERMANENTLY, "Moved Permanently" },
 267         { HTTP_NOT_MODIFIED, "Not Modified" },
 268         { HTTP_BAD_GATEWAY, "Bad Gateway", "" },
 269         { HTTP_SERVICE_UNAVAILABLE, "Service Unavailable", "" },
 270 #endif
 271 };
 272
 273
 274 static const char RFC1123FMT[] = "%a, %d %b %Y %H:%M:%S GMT";
 275 static const char Content_length[] = "Content-length:";
 276
 277
 278 static int scan_ip(const char **ep, unsigned int *ip, unsigned char endc)
 279 {
 280         const char *p = *ep;
 281         int auto_mask = 8;
 282         int j;
 283
 284         *ip = 0;
 285         for (j = 0; j < 4; j++) {
 286                 unsigned int octet;
 287
 288                 if ((*p < '0' || *p > '9') && (*p != '/' || j == 0) && *p != 0)
 289                         return -auto_mask;
 290                 octet = 0;
 291                 while (*p >= '0' && *p <= '9') {
 292                         octet *= 10;
 293                         octet += *p - '0';
 294                         if (octet > 255)
 295                                 return -auto_mask;
 296                         p++;
 297                 }
 298                 if (*p == '.')
 299                         p++;
 300                 if (*p != '/' && *p != 0)
 301                         auto_mask += 8;
 302                 *ip = ((*ip) << 8) | octet;
 303         }
 304         if (*p != 0) {
 305                 if (*p != endc)
 306                         return -auto_mask;
 307                 p++;
 308                 if (*p == 0)
 309                         return -auto_mask;
 310         }
 311         *ep = p;
 312         return auto_mask;
 313 }
 314
 315 static int scan_ip_mask(const char *ipm, unsigned int *ip, unsigned int *mask)
 316 {
 317         int i;
 318         unsigned int msk;
 319
 320         i = scan_ip(&ipm, ip, '/');
 321         if (i < 0)
 322                 return i;
 323         if (*ipm) {
 324                 const char *p = ipm;
 325
 326                 i = 0;
 327                 while (*p) {
 328                         if (*p < '0' || *p > '9') {
 329                                 if (*p == '.') {
 330                                         i = scan_ip(&ipm, mask, 0);
 331                                         return i != 32;
 332                                 }
 333                                 return -1;
 334                         }
 335                         i *= 10;
 336                         i += *p - '0';
 337                         p++;
 338                 }
 339         }
 340         if (i > 32 || i < 0)
 341                 return -1;
 342         msk = 0x80000000;
 343         *mask = 0;
 344         while (i > 0) {
 345                 *mask |= msk;
 346                 msk >>= 1;
 347                 i--;
 348         }
 349         return 0;
 350 }
 351
 352 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 353 static void free_config_lines(Htaccess **pprev)
 354 {
 355         Htaccess *prev = *pprev;
 356
 357         while (prev) {
 358                 Htaccess *cur = prev;
 359
 360                 prev = cur->next;
 361                 free(cur);
 362         }
 363         *pprev = NULL;
 364 }
 365 #endif
 366
 367 /* flag */
 368 #define FIRST_PARSE          0
 369 #define SUBDIR_PARSE         1
 370 #define SIGNALED_PARSE       2
 371 #define FIND_FROM_HTTPD_ROOT 3
 372 /****************************************************************************
 373  *
 374  > $Function: parse_conf()
 375  *
 376  * $Description: parse configuration file into in-memory linked list.
 377  *
 378  * The first non-white character is examined to determine if the config line
 379  * is one of the following:
 380  *    .ext:mime/type   # new mime type not compiled into httpd
 381  *    [adAD]:from      # ip address allow/deny, * for wildcard
 382  *    /path:user:pass  # username/password
 383  *
 384  * Any previous IP rules are discarded.
 385  * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
 386  * are also discarded.  That is, previous settings are retained if flag is
 387  * SUBDIR_PARSE.
 388  *
 389  * $Parameters:
 390  *      (const char *) path . . null for ip address checks, path for password
 391  *                              checks.
 392  *      (int) flag  . . . . . . the source of the parse request.
 393  *
 394  * $Return: (None)
 395  *
 396  ****************************************************************************/
 397 static void parse_conf(const char *path, int flag)
 398 {
 399         FILE *f;
 400 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 401         Htaccess *prev, *cur;
 402 #elif CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 403         Htaccess *cur;
 404 #endif
 405
 406         const char *cf = config->configFile;
 407         char buf[160];
 408         char *p0 = NULL;
 409         char *c, *p;
 410
 411         /* free previous ip setup if present */
 412         Htaccess_IP *pip = config->ip_a_d;
 413
 414         while (pip) {
 415                 Htaccess_IP *cur_ipl = pip;
 416
 417                 pip = cur_ipl->next;
 418                 free(cur_ipl);
 419         }
 420         config->ip_a_d = NULL;
 421
 422         config->flg_deny_all = 0;
 423
 424 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 425         /* retain previous auth and mime config only for subdir parse */
 426         if (flag != SUBDIR_PARSE) {
 427 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 428                 free_config_lines(&config->auth);
 429 #endif
 430 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 431                 free_config_lines(&config->mime_a);
 432 #endif
 433 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 434                 free_config_lines(&config->script_i);
 435 #endif
 436         }
 437 #endif
 438
 439         if (flag == SUBDIR_PARSE || cf == NULL) {
 440                 cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
 441                 if (cf == NULL) {
 442                         if (flag == FIRST_PARSE)
 443                         bb_error_msg_and_die(bb_msg_memory_exhausted);
 444                         return;
 445                 }
 446                 sprintf((char *)cf, "%s/%s", path, httpd_conf);
 447         }
 448
 449         while ((f = fopen(cf, "r")) == NULL) {
 450                 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
 451                         /* config file not found, no changes to config */
 452                         return;
 453                 }
 454                 if (config->configFile && flag == FIRST_PARSE) /* if -c option given */
 455                         bb_perror_msg_and_die("%s", cf);
 456                 flag = FIND_FROM_HTTPD_ROOT;
 457                 cf = httpd_conf;
 458         }
 459
 460 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 461                 prev = config->auth;
 462 #endif
 463                 /* This could stand some work */
 464         while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
 465                 c = NULL;
 466                 for (p = p0; *p0 != 0 && *p0 != '#'; p0++) {
 467                         if (!isspace(*p0)) {
 468                                 *p++ = *p0;
 469                                 if (*p0 == ':' && c == NULL)
 470                                 c = p;
 471                         }
 472                 }
 473                 *p = 0;
 474
 475                 /* test for empty or strange line */
 476                 if (c == NULL || *c == 0)
 477                         continue;
 478                 p0 = buf;
 479                 if (*p0 == 'd')
 480                                 *p0 = 'D';
 481                 if (*c == '*') {
 482                         if (*p0 == 'D') {
 483                                 /* memorize deny all */
 484                                 config->flg_deny_all++;
 485                         }
 486                         /* skip default other "word:*" config lines */
 487                         continue;
 488                 }
 489
 490                 if (*p0 == 'a')
 491                         *p0 = 'A';
 492                 else if (*p0 != 'D' && *p0 != 'A'
 493 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 494                          && *p0 != '/'
 495 #endif
 496 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 497                          && *p0 != '.'
 498 #endif
 499 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 500                          && *p0 != '*'
 501 #endif
 502                         )
 503                          continue;
 504                 if (*p0 == 'A' || *p0 == 'D') {
 505                         /* storing current config IP line */
 506                         pip = calloc(1, sizeof(Htaccess_IP));
 507                         if (pip) {
 508                                 if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) {
 509                                         /* syntax IP{/mask} error detected, protect all */
 510                                         *p0 = 'D';
 511                                         pip->mask = 0;
 512                                 }
 513                                 pip->allow_deny = *p0;
 514                                 if (*p0 == 'D') {
 515                                         /* Deny:form_IP move top */
 516                                         pip->next = config->ip_a_d;
 517                                         config->ip_a_d = pip;
 518                                 } else {
 519                                         /* add to bottom A:form_IP config line */
 520                                         Htaccess_IP *prev_IP = config->ip_a_d;
 521
 522                                         if (prev_IP == NULL) {
 523                                                 config->ip_a_d = pip;
 524                                         } else {
 525                                                 while (prev_IP->next)
 526                                                         prev_IP = prev_IP->next;
 527                                                 prev_IP->next = pip;
 528                                         }
 529                                 }
 530                         }
 531                         continue;
 532                 }
 533 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 534                 if (*p0 == '/') {
 535                         /* make full path from httpd root / curent_path / config_line_path */
 536                         cf = flag == SUBDIR_PARSE ? path : "";
 537                         p0 = malloc(strlen(cf) + (c - buf) + 2 + strlen(c));
 538                         if (p0 == NULL)
 539                                 continue;
 540                         c[-1] = 0;
 541                         sprintf(p0, "/%s%s", cf, buf);
 542
 543                         /* another call bb_simplify_path */
 544                         cf = p = p0;
 545
 546                         do {
 547                                 if (*p == '/') {
 548                                         if (*cf == '/') {    /* skip duplicate (or initial) slash */
 549                                                 continue;
 550                                         } else if (*cf == '.') {
 551                                                 if (cf[1] == '/' || cf[1] == 0) { /* remove extra '.' */
 552                                                         continue;
 553                                                 } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == 0)) {
 554                                                         ++cf;
 555                                                         if (p > p0) {
 556                                                                 while (*--p != '/') /* omit previous dir */;
 557                                                         }
 558                                                         continue;
 559                                                 }
 560                                         }
 561                                 }
 562                                 *++p = *cf;
 563                         } while (*++cf);
 564
 565                         if ((p == p0) || (*p != '/')) {      /* not a trailing slash */
 566                                 ++p;                             /* so keep last character */
 567                         }
 568                         *p = 0;
 569                         sprintf(p0, "%s:%s", p0, c);
 570                 }
 571 #endif
 572
 573 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 574                 /* storing current config line */
 575                 cur = calloc(1, sizeof(Htaccess) + strlen(p0));
 576                 if (cur) {
 577                         cf = strcpy(cur->before_colon, p0);
 578                         c = strchr(cf, ':');
 579                         *c++ = 0;
 580                         cur->after_colon = c;
 581 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 582                         if (*cf == '.') {
 583                                 /* config .mime line move top for overwrite previous */
 584                                 cur->next = config->mime_a;
 585                                 config->mime_a = cur;
 586                                 continue;
 587                         }
 588 #endif
 589 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 590                         if (*cf == '*' && cf[1] == '.') {
 591                                 /* config script interpreter line move top for overwrite previous */
 592                                 cur->next = config->script_i;
 593                                 config->script_i = cur;
 594                                 continue;
 595                         }
 596 #endif
 597 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 598                         free(p0);
 599                         if (prev == NULL) {
 600                                 /* first line */
 601                                 config->auth = prev = cur;
 602                         } else {
 603                                 /* sort path, if current lenght eq or bigger then move up */
 604                                 Htaccess *prev_hti = config->auth;
 605                                 size_t l = strlen(cf);
 606                                 Htaccess *hti;
 607
 608                                 for (hti = prev_hti; hti; hti = hti->next) {
 609                                         if (l >= strlen(hti->before_colon)) {
 610                                                 /* insert before hti */
 611                                                 cur->next = hti;
 612                                                 if (prev_hti != hti) {
 613                                                         prev_hti->next = cur;
 614                                                 } else {
 615                                                         /* insert as top */
 616                                                         config->auth = cur;
 617                                                 }
 618                                                 break;
 619                                         }
 620                                         if (prev_hti != hti)
 621                                                 prev_hti = prev_hti->next;
 622                                 }
 623                                 if (!hti) {       /* not inserted, add to bottom */
 624                                         prev->next = cur;
 625                                         prev = cur;
 626                                 }
 627                         }
 628 #endif
 629                 }
 630 #endif
 631          }
 632          fclose(f);
 633 }
 634
 635 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
 636 /****************************************************************************
 637  *
 638  > $Function: encodeString()
 639  *
 640  * $Description: Given a string, html encode special characters.
 641  *   This is used for the -e command line option to provide an easy way
 642  *   for scripts to encode result data without confusing browsers.  The
 643  *   returned string pointer is memory allocated by malloc().
 644  *
 645  * $Parameters:
 646  *      (const char *) string . . The first string to encode.
 647  *
 648  * $Return: (char *) . . . .. . . A pointer to the encoded string.
 649  *
 650  * $Errors: Returns a null string ("") if memory is not available.
 651  *
 652  ****************************************************************************/
 653 static char *encodeString(const char *string)
 654 {
 655         /* take the simple route and encode everything */
 656         /* could possibly scan once to get length.     */
 657         int len = strlen(string);
 658         char *out = malloc(len * 6 + 1);
 659         char *p = out;
 660         char ch;
 661
 662         if (!out) return "";
 663         while ((ch = *string++)) {
 664                 // very simple check for what to encode
 665                 if (isalnum(ch)) *p++ = ch;
 666                 else p += sprintf(p, "&#%d;", (unsigned char) ch);
 667         }
 668         *p = 0;
 669         return out;
 670 }
 671 #endif          /* CONFIG_FEATURE_HTTPD_ENCODE_URL_STR */
 672
 673 /****************************************************************************
 674  *
 675  > $Function: decodeString()
 676  *
 677  * $Description: Given a URL encoded string, convert it to plain ascii.
 678  *   Since decoding always makes strings smaller, the decode is done in-place.
 679  *   Thus, callers should strdup() the argument if they do not want the
 680  *   argument modified.  The return is the original pointer, allowing this
 681  *   function to be easily used as arguments to other functions.
 682  *
 683  * $Parameters:
 684  *      (char *) string . . . The first string to decode.
 685  *      (int)    flag   . . . 1 if require decode '+' as ' ' for CGI
 686  *
 687  * $Return: (char *)  . . . . A pointer to the decoded string (same as input).
 688  *
 689  * $Errors: None
 690  *
 691  ****************************************************************************/
 692 static char *decodeString(char *orig, int flag_plus_to_space)
 693 {
 694         /* note that decoded string is always shorter than original */
 695         char *string = orig;
 696         char *ptr = string;
 697
 698         while (*ptr) {
 699                 if (*ptr == '+' && flag_plus_to_space) { *string++ = ' '; ptr++; }
 700                 else if (*ptr != '%') *string++ = *ptr++;
 701                 else {
 702                         unsigned int value1, value2;
 703
 704                         ptr++;
 705                         if (sscanf(ptr, "%1X", &value1) != 1 ||
 706                                                     sscanf(ptr+1, "%1X", &value2) != 1) {
 707                                 if (!flag_plus_to_space)
 708                                         return NULL;
 709                                 *string++ = '%';
 710                         } else {
 711                                 value1 = value1 * 16 + value2;
 712                                 if (value1 == '/' || value1 == 0)
 713                                         return orig+1;
 714                                 *string++ = value1;
 715                                 ptr += 2;
 716                         }
 717                 }
 718         }
 719         *string = '\0';
 720         return orig;
 721 }
 722
 723
 724 #if ENABLE_FEATURE_HTTPD_CGI
 725 /****************************************************************************
 726  *
 727  > $Function: addEnv()
 728  *
 729  * $Description: Add an environment variable setting to the global list.
 730  *    A NAME=VALUE string is allocated, filled, and added to the list of
 731  *    environment settings passed to the cgi execution script.
 732  *
 733  * $Parameters:
 734  *  (char *) name_before_underline - The first part environment variable name.
 735  *  (char *) name_after_underline  - The second part environment variable name.
 736  *  (char *) value  . . The value to which the env variable is set.
 737  *
 738  * $Return: (void)
 739  *
 740  * $Errors: Silently returns if the env runs out of space to hold the new item
 741  *
 742  ****************************************************************************/
 743 static void addEnv(const char *name_before_underline,
 744                         const char *name_after_underline, const char *value)
 745 {
 746         char *s = NULL;
 747         const char *underline;
 748
 749         if (!value)
 750                 value = "";
 751         underline = *name_after_underline ? "_" : "";
 752         asprintf(&s, "%s%s%s=%s", name_before_underline, underline,
 753                                                       name_after_underline, value);
 754         if (s) {
 755                 putenv(s);
 756         }
 757 }
 758
 759 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV || ENABLE_FEATURE_HTTPD_WITHOUT_INETD
 760 /* set environs SERVER_PORT and REMOTE_PORT */
 761 static void addEnvPort(const char *port_name)
 762 {
 763         char buf[16];
 764
 765         sprintf(buf, "%u", config->port);
 766         addEnv(port_name, "PORT", buf);
 767 }
 768 #endif
 769 #endif          /* CONFIG_FEATURE_HTTPD_CGI */
 770
 771
 772 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 773 /****************************************************************************
 774  *
 775  > $Function: decodeBase64()
 776  *
 777  > $Description: Decode a base 64 data stream as per rfc1521.
 778  *    Note that the rfc states that none base64 chars are to be ignored.
 779  *    Since the decode always results in a shorter size than the input, it is
 780  *    OK to pass the input arg as an output arg.
 781  *
 782  * $Parameter:
 783  *      (char *) Data . . . . A pointer to a base64 encoded string.
 784  *                            Where to place the decoded data.
 785  *
 786  * $Return: void
 787  *
 788  * $Errors: None
 789  *
 790  ****************************************************************************/
 791 static void decodeBase64(char *Data)
 792 {
 793
 794         const unsigned char *in = (const unsigned char *)Data;
 795         // The decoded size will be at most 3/4 the size of the encoded
 796         unsigned long ch = 0;
 797         int i = 0;
 798
 799         while (*in) {
 800                 int t = *in++;
 801
 802                 if (t >= '0' && t <= '9')
 803                         t = t - '0' + 52;
 804                 else if (t >= 'A' && t <= 'Z')
 805                         t = t - 'A';
 806                 else if (t >= 'a' && t <= 'z')
 807                         t = t - 'a' + 26;
 808                 else if (t == '+')
 809                         t = 62;
 810                 else if (t == '/')
 811                         t = 63;
 812                 else if (t == '=')
 813                         t = 0;
 814                 else
 815                         continue;
 816
 817                 ch = (ch << 6) | t;
 818                 i++;
 819                 if (i == 4) {
 820                         *Data++ = (char) (ch >> 16);
 821                         *Data++ = (char) (ch >> 8);
 822                         *Data++ = (char) ch;
 823                         i = 0;
 824                 }
 825         }
 826         *Data = 0;
 827 }
 828 #endif
 829
 830
 831 #if ENABLE_FEATURE_HTTPD_WITHOUT_INETD
 832 /****************************************************************************
 833  *
 834  > $Function: openServer()
 835  *
 836  * $Description: create a listen server socket on the designated port.
 837  *
 838  * $Return: (int)  . . . A connection socket. -1 for errors.
 839  *
 840  * $Errors: None
 841  *
 842  ****************************************************************************/
 843 static int openServer(void)
 844 {
 845         struct sockaddr_in lsocket;
 846         int fd;
 847         int on = 1;
 848
 849         /* create the socket right now */
 850         /* inet_addr() returns a value that is already in network order */
 851         memset(&lsocket, 0, sizeof(lsocket));
 852         lsocket.sin_family = AF_INET;
 853         lsocket.sin_addr.s_addr = INADDR_ANY;
 854         lsocket.sin_port = htons(config->port);
 855         fd = xsocket(AF_INET, SOCK_STREAM, 0);
 856         /* tell the OS it's OK to reuse a previous address even though */
 857         /* it may still be in a close down state.  Allows bind to succeed. */
 858 #ifdef SO_REUSEPORT
 859         setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (void *)&on, sizeof(on));
 860 #else
 861         setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
 862 #endif
 863         xbind(fd, (struct sockaddr *)&lsocket, sizeof(lsocket));
 864         xlisten(fd, 9);
 865         signal(SIGCHLD, SIG_IGN);   /* prevent zombie (defunct) processes */
 866         return fd;
 867 }
 868 #endif  /* CONFIG_FEATURE_HTTPD_WITHOUT_INETD */
 869
 870 /****************************************************************************
 871  *
 872  > $Function: sendHeaders()
 873  *
 874  * $Description: Create and send HTTP response headers.
 875  *   The arguments are combined and sent as one write operation.  Note that
 876  *   IE will puke big-time if the headers are not sent in one packet and the
 877  *   second packet is delayed for any reason.
 878  *
 879  * $Parameter:
 880  *      (HttpResponseNum) responseNum . . . The result code to send.
 881  *
 882  * $Return: (int)  . . . . writing errors
 883  *
 884  ****************************************************************************/
 885 static int sendHeaders(HttpResponseNum responseNum)
 886 {
 887         char *buf = config->buf;
 888         const char *responseString = "";
 889         const char *infoString = 0;
 890         const char *mime_type;
 891         unsigned int i;
 892         time_t timer = time(0);
 893         char timeStr[80];
 894         int len;
 895
 896         for (i = 0;
 897                 i < (sizeof(httpResponseNames)/sizeof(httpResponseNames[0])); i++) {
 898                 if (httpResponseNames[i].type == responseNum) {
 899                         responseString = httpResponseNames[i].name;
 900                         infoString = httpResponseNames[i].info;
 901                         break;
 902                 }
 903         }
 904         /* error message is HTML */
 905         mime_type = responseNum == HTTP_OK ?
 906                                 config->httpd_found.found_mime_type : "text/html";
 907
 908         /* emit the current date */
 909         strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&timer));
 910         len = sprintf(buf,
 911                 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
 912                 "Date: %s\r\nConnection: close\r\n",
 913                         responseNum, responseString, mime_type, timeStr);
 914
 915 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 916         if (responseNum == HTTP_UNAUTHORIZED) {
 917                 len += sprintf(buf+len, "WWW-Authenticate: Basic realm=\"%s\"\r\n",
 918                                                                     config->realm);
 919         }
 920 #endif
 921         if (responseNum == HTTP_MOVED_TEMPORARILY) {
 922                 len += sprintf(buf+len, "Location: %s/%s%s\r\n",
 923                                 config->httpd_found.found_moved_temporarily,
 924                                 (config->query ? "?" : ""),
 925                                 (config->query ? config->query : ""));
 926         }
 927
 928         if (config->ContentLength != -1) {    /* file */
 929                 strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&config->last_mod));
 930                 len += sprintf(buf+len, "Last-Modified: %s\r\n%s " cont_l_fmt "\r\n",
 931                                                       timeStr, Content_length, cont_l_type config->ContentLength);
 932         }
 933         strcat(buf, "\r\n");
 934         len += 2;
 935         if (infoString) {
 936                 len += sprintf(buf+len,
 937                                 "<HEAD><TITLE>%d %s</TITLE></HEAD>\n"
 938                                 "<BODY><H1>%d %s</H1>\n%s\n</BODY>\n",
 939                                 responseNum, responseString,
 940                                 responseNum, responseString, infoString);
 941         }
 942 #if DEBUG
 943         fprintf(stderr, "Headers: '%s'", buf);
 944 #endif
 945         return full_write(a_c_w, buf, len);
 946 }
 947
 948 /****************************************************************************
 949  *
 950  > $Function: getLine()
 951  *
 952  * $Description: Read from the socket until an end of line char found.
 953  *
 954  *   Characters are read one at a time until an eol sequence is found.
 955  *
 956  * $Return: (int) . . . . number of characters read.  -1 if error.
 957  *
 958  ****************************************************************************/
 959 static int getLine(void)
 960 {
 961         int  count = 0;
 962         char *buf = config->buf;
 963
 964         while (read(a_c_r, buf + count, 1) == 1) {
 965                 if (buf[count] == '\r') continue;
 966                 if (buf[count] == '\n') {
 967                         buf[count] = 0;
 968                         return count;
 969                 }
 970                 if (count < (MAX_MEMORY_BUFF-1))      /* check owerflow */
 971                         count++;
 972         }
 973         if (count) return count;
 974         else return -1;
 975 }
 976
 977 #if ENABLE_FEATURE_HTTPD_CGI
 978 /****************************************************************************
 979  *
 980  > $Function: sendCgi()
 981  *
 982  * $Description: Execute a CGI script and send it's stdout back
 983  *
 984  *   Environment variables are set up and the script is invoked with pipes
 985  *   for stdin/stdout.  If a post is being done the script is fed the POST
 986  *   data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
 987  *
 988  * $Parameters:
 989  *      (const char *) url . . . . . . The requested URL (with leading /).
 990  *      (int bodyLen)  . . . . . . . . Length of the post body.
 991  *      (const char *cookie) . . . . . For set HTTP_COOKIE.
 992  *      (const char *content_type) . . For set CONTENT_TYPE.
 993
 994  *
 995  * $Return: (char *)  . . . . A pointer to the decoded string (same as input).
 996  *
 997  * $Errors: None
 998  *
 999  ****************************************************************************/
1000 static int sendCgi(const char *url,
1001                                          const char *request, int bodyLen, const char *cookie,
1002                                          const char *content_type)
1003 {
1004         int fromCgi[2];  /* pipe for reading data from CGI */
1005         int toCgi[2];    /* pipe for sending data to CGI */
1006
1007         static char * argp[] = { 0, 0 };
1008         int pid = 0;
1009         int inFd;
1010         int outFd;
1011         int firstLine = 1;
1012
1013         do {
1014                 if (pipe(fromCgi) != 0) {
1015                         break;
1016                 }
1017                 if (pipe(toCgi) != 0) {
1018                         break;
1019                 }
1020
1021                 pid = fork();
1022                 if (pid < 0) {
1023                         pid = 0;
1024                         break;
1025                 }
1026
1027                 if (!pid) {
1028                         /* child process */
1029                         char *script;
1030                         char *purl = strdup(url);
1031                         char realpath_buff[MAXPATHLEN];
1032
1033                         if (purl == NULL)
1034                                 _exit(242);
1035
1036                         inFd  = toCgi[0];
1037                         outFd = fromCgi[1];
1038
1039                         dup2(inFd, 0);  // replace stdin with the pipe
1040                         dup2(outFd, 1);  // replace stdout with the pipe
1041                         if (!DEBUG)
1042                                 dup2(outFd, 2);  // replace stderr with the pipe
1043
1044                         close(toCgi[0]);
1045                         close(toCgi[1]);
1046                         close(fromCgi[0]);
1047                         close(fromCgi[1]);
1048
1049                         /*
1050                          * Find PATH_INFO.
1051                          */
1052                         script = purl;
1053                         while ((script = strchr(script + 1, '/')) != NULL) {
1054                                 /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1055                                 struct stat sb;
1056
1057                                 *script = '\0';
1058                                 if (is_directory(purl + 1, 1, &sb) == 0) {
1059                                         /* not directory, found script.cgi/PATH_INFO */
1060                                         *script = '/';
1061                                         break;
1062                                 }
1063                                 *script = '/';          /* is directory, find next '/' */
1064                         }
1065                         addEnv("PATH", "INFO", script);   /* set /PATH_INFO or NULL */
1066                         addEnv("PATH",           "",         getenv("PATH"));
1067                         addEnv("REQUEST",        "METHOD",   request);
1068                         if (config->query) {
1069                                 char *uri = alloca(strlen(purl) + 2 + strlen(config->query));
1070                                 if (uri)
1071                                         sprintf(uri, "%s?%s", purl, config->query);
1072                                 addEnv("REQUEST",        "URI",   uri);
1073                         } else {
1074                                 addEnv("REQUEST",        "URI",   purl);
1075                         }
1076                         if (script != NULL)
1077                                 *script = '\0';         /* reduce /PATH_INFO */
1078                          /* SCRIPT_FILENAME required by PHP in CGI mode */
1079                         if (realpath(purl + 1, realpath_buff))
1080                                 addEnv("SCRIPT", "FILENAME", realpath_buff);
1081                         else
1082                                 *realpath_buff = 0;
1083                         /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1084                         addEnv("SCRIPT_NAME",    "",         purl);
1085                         addEnv("QUERY_STRING",   "",         config->query);
1086                         addEnv("SERVER",         "SOFTWARE", httpdVersion);
1087                         addEnv("SERVER",         "PROTOCOL", "HTTP/1.0");
1088                         addEnv("GATEWAY_INTERFACE", "",      "CGI/1.1");
1089                         addEnv("REMOTE",         "ADDR",     config->rmt_ip_str);
1090 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1091                         addEnvPort("REMOTE");
1092 #endif
1093                         if (bodyLen) {
1094                                 char sbl[32];
1095
1096                                 sprintf(sbl, "%d", bodyLen);
1097                                 addEnv("CONTENT", "LENGTH", sbl);
1098                         }
1099                         if (cookie)
1100                                 addEnv("HTTP", "COOKIE", cookie);
1101                         if (content_type)
1102                                 addEnv("CONTENT", "TYPE", content_type);
1103 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1104                         if (config->remoteuser) {
1105                                 addEnv("REMOTE", "USER", config->remoteuser);
1106                                 addEnv("AUTH_TYPE", "", "Basic");
1107                         }
1108 #endif
1109                         if (config->referer)
1110                                 addEnv("HTTP", "REFERER", config->referer);
1111
1112                         /* set execve argp[0] without path */
1113                         argp[0] = strrchr(purl, '/') + 1;
1114                         /* but script argp[0] must have absolute path and chdiring to this */
1115                         if (*realpath_buff) {
1116                                 script = strrchr(realpath_buff, '/');
1117                                 if (script) {
1118                                         *script = '\0';
1119                                         if (chdir(realpath_buff) == 0) {
1120                                                 // now run the program.  If it fails,
1121                                                 // use _exit() so no destructors
1122                                                 // get called and make a mess.
1123 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1124                                                 char *interpr = NULL;
1125                                                 char *suffix = strrchr(purl, '.');
1126
1127                                                 if (suffix) {
1128                                                         Htaccess * cur;
1129                                                         for (cur = config->script_i; cur; cur = cur->next)
1130                                                                 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1131                                                                         interpr = cur->after_colon;
1132                                                                         break;
1133                                                                 }
1134                                                 }
1135 #endif
1136                                                 *script = '/';
1137 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1138                                                 if (interpr)
1139                                                         execv(interpr, argp);
1140                                                 else
1141 #endif
1142                                                         execv(realpath_buff, argp);
1143                                         }
1144                                 }
1145                         }
1146 #if ENABLE_FEATURE_HTTPD_WITHOUT_INETD
1147                         config->accepted_socket = 1;      /* send to stdout */
1148 #endif
1149                         sendHeaders(HTTP_NOT_FOUND);
1150                         _exit(242);
1151                 } /* end child */
1152
1153         } while (0);
1154
1155         if (pid) {
1156                 /* parent process */
1157                 int status;
1158                 size_t post_readed_size = 0, post_readed_idx = 0;
1159
1160                 inFd  = fromCgi[0];
1161                 outFd = toCgi[1];
1162                 close(fromCgi[1]);
1163                 close(toCgi[0]);
1164                 signal(SIGPIPE, SIG_IGN);
1165
1166                 while (1) {
1167                         fd_set readSet;
1168                         fd_set writeSet;
1169                         char wbuf[128];
1170                         int nfound;
1171                         int count;
1172
1173                         FD_ZERO(&readSet);
1174                         FD_ZERO(&writeSet);
1175                         FD_SET(inFd, &readSet);
1176                         if (bodyLen > 0 || post_readed_size > 0) {
1177                                 FD_SET(outFd, &writeSet);
1178                                 nfound = outFd > inFd ? outFd : inFd;
1179                                 if (post_readed_size == 0) {
1180                                         FD_SET(a_c_r, &readSet);
1181                                         if (nfound < a_c_r)
1182                                                 nfound = a_c_r;
1183                                 }
1184                                 /* Now wait on the set of sockets! */
1185                                 nfound = select(nfound + 1, &readSet, &writeSet, 0, NULL);
1186                         } else {
1187                                 if (!bodyLen) {
1188                                         close(outFd);
1189                                         bodyLen = -1;
1190                                 }
1191                                 nfound = select(inFd + 1, &readSet, 0, 0, NULL);
1192                         }
1193
1194                         if (nfound <= 0) {
1195                                 if (waitpid(pid, &status, WNOHANG) > 0) {
1196                                         close(inFd);
1197 #if DEBUG
1198                                         if (WIFEXITED(status))
1199                                                 bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status));
1200                                         if (WIFSIGNALED(status))
1201                                                 bb_error_msg("piped has exited with signal=%d", WTERMSIG(status));
1202 #endif
1203                                         break;
1204                                 }
1205                         } else if (post_readed_size > 0 && FD_ISSET(outFd, &writeSet)) {
1206                                 count = full_write(outFd, wbuf + post_readed_idx, post_readed_size);
1207                                 if (count > 0) {
1208                                         post_readed_size -= count;
1209                                         post_readed_idx += count;
1210                                         if (post_readed_size == 0)
1211                                                 post_readed_idx = 0;
1212                                 } else {
1213                                         post_readed_size = post_readed_idx = bodyLen = 0; /* broken pipe to CGI */
1214                                 }
1215                         } else if (bodyLen > 0 && post_readed_size == 0 && FD_ISSET(a_c_r, &readSet)) {
1216                                 count = bodyLen > (int)sizeof(wbuf) ? (int)sizeof(wbuf) : bodyLen;
1217                                 count = safe_read(a_c_r, wbuf, count);
1218                                 if (count > 0) {
1219                                         post_readed_size += count;
1220                                         bodyLen -= count;
1221                                 } else {
1222                                         bodyLen = 0;    /* closed */
1223                                 }
1224                         }
1225                         if (FD_ISSET(inFd, &readSet)) {
1226                                 int s = a_c_w;
1227                                 char *rbuf = config->buf;
1228
1229 #ifndef PIPE_BUF
1230 # define PIPESIZE 4096          /* amount of buffering in a pipe */
1231 #else
1232 # define PIPESIZE PIPE_BUF
1233 #endif
1234 #if PIPESIZE >= MAX_MEMORY_BUFF
1235 # error "PIPESIZE >= MAX_MEMORY_BUFF"
1236 #endif
1237
1238                                 // There is something to read
1239                                 count = safe_read(inFd, rbuf, PIPESIZE);
1240                                 if (count == 0)
1241                                         break;  /* closed */
1242                                 if (count > 0) {
1243                                         if (firstLine) {
1244                                                 rbuf[count] = 0;
1245                                                 /* check to see if the user script added headers */
1246                                                 if (strncmp(rbuf, "HTTP/1.0 200 OK\r\n", 4) != 0) {
1247                                                         full_write(s, "HTTP/1.0 200 OK\r\n", 17);
1248                                                 }
1249                                                 if (strstr(rbuf, "ontent-") == 0) {
1250                                                         full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1251                                                 }
1252                                                 firstLine = 0;
1253                                         }
1254                                         if (full_write(s, rbuf, count) != count)
1255                                                 break;
1256
1257 #if DEBUG
1258                                         fprintf(stderr, "cgi read %d bytes\n", count);
1259 #endif
1260                                 }
1261                         }
1262                 }
1263         }
1264         return 0;
1265 }
1266 #endif          /* CONFIG_FEATURE_HTTPD_CGI */
1267
1268 /****************************************************************************
1269  *
1270  > $Function: sendFile()
1271  *
1272  * $Description: Send a file response to an HTTP request
1273  *
1274  * $Parameter:
1275  *      (const char *) url . . The URL requested.
1276  *
1277  * $Return: (int)  . . . . . . Always 0.
1278  *
1279  ****************************************************************************/
1280 static int sendFile(const char *url)
1281 {
1282         char * suffix;
1283         int  f;
1284         const char * const * table;
1285         const char * try_suffix;
1286
1287         suffix = strrchr(url, '.');
1288
1289         for (table = suffixTable; *table; table += 2)
1290                 if (suffix != NULL && (try_suffix = strstr(*table, suffix)) != 0) {
1291                         try_suffix += strlen(suffix);
1292                         if (*try_suffix == 0 || *try_suffix == '.')
1293                                 break;
1294                 }
1295         /* also, if not found, set default as "application/octet-stream";  */
1296         config->httpd_found.found_mime_type = *(table+1);
1297 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1298         if (suffix) {
1299                 Htaccess * cur;
1300
1301                 for (cur = config->mime_a; cur; cur = cur->next) {
1302                         if (strcmp(cur->before_colon, suffix) == 0) {
1303                                 config->httpd_found.found_mime_type = cur->after_colon;
1304                                 break;
1305                         }
1306                 }
1307         }
1308 #endif  /* CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */
1309
1310 #if DEBUG
1311         fprintf(stderr, "Sending file '%s' Content-type: %s\n",
1312                                                 url, config->httpd_found.found_mime_type);
1313 #endif
1314
1315         f = open(url, O_RDONLY);
1316         if (f >= 0) {
1317                 int count;
1318                 char *buf = config->buf;
1319
1320                 sendHeaders(HTTP_OK);
1321                 while ((count = full_read(f, buf, MAX_MEMORY_BUFF)) > 0) {
1322                         if (full_write(a_c_w, buf, count) != count)
1323                                 break;
1324                 }
1325                 close(f);
1326         } else {
1327 #if DEBUG
1328                 bb_perror_msg("Unable to open '%s'", url);
1329 #endif
1330                 sendHeaders(HTTP_NOT_FOUND);
1331         }
1332
1333         return 0;
1334 }
1335
1336 static int checkPermIP(void)
1337 {
1338         Htaccess_IP * cur;
1339
1340         /* This could stand some work */
1341         for (cur = config->ip_a_d; cur; cur = cur->next) {
1342 #if DEBUG
1343                 fprintf(stderr, "checkPermIP: '%s' ? ", config->rmt_ip_str);
1344                 fprintf(stderr, "'%u.%u.%u.%u/%u.%u.%u.%u'\n",
1345                                 (unsigned char)(cur->ip >> 24),
1346                                 (unsigned char)(cur->ip >> 16),
1347                                 (unsigned char)(cur->ip >> 8),
1348                                                     cur->ip & 0xff,
1349                                 (unsigned char)(cur->mask >> 24),
1350                                 (unsigned char)(cur->mask >> 16),
1351                                 (unsigned char)(cur->mask >> 8),
1352                                                     cur->mask & 0xff);
1353 #endif
1354                 if ((config->rmt_ip & cur->mask) == cur->ip)
1355                         return cur->allow_deny == 'A';   /* Allow/Deny */
1356         }
1357
1358         /* if unconfigured, return 1 - access from all */
1359         return !config->flg_deny_all;
1360 }
1361
1362 /****************************************************************************
1363  *
1364  > $Function: checkPerm()
1365  *
1366  * $Description: Check the permission file for access password protected.
1367  *
1368  *   If config file isn't present, everything is allowed.
1369  *   Entries are of the form you can see example from header source
1370  *
1371  * $Parameters:
1372  *      (const char *) path  . . . . The file path.
1373  *      (const char *) request . . . User information to validate.
1374  *
1375  * $Return: (int)  . . . . . . . . . 1 if request OK, 0 otherwise.
1376  *
1377  ****************************************************************************/
1378
1379 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1380 static int checkPerm(const char *path, const char *request)
1381 {
1382         Htaccess * cur;
1383         const char *p;
1384         const char *p0;
1385
1386         const char *prev = NULL;
1387
1388         /* This could stand some work */
1389         for (cur = config->auth; cur; cur = cur->next) {
1390                 p0 = cur->before_colon;
1391                 if (prev != NULL && strcmp(prev, p0) != 0)
1392                         continue;       /* find next identical */
1393                 p = cur->after_colon;
1394 #if DEBUG
1395                 fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
1396 #endif
1397                 {
1398                         size_t l = strlen(p0);
1399
1400                         if (strncmp(p0, path, l) == 0 &&
1401                                             (l == 1 || path[l] == '/' || path[l] == 0)) {
1402                                 char *u;
1403                                 /* path match found.  Check request */
1404                                 /* for check next /path:user:password */
1405                                 prev = p0;
1406                                 u = strchr(request, ':');
1407                                 if (u == NULL) {
1408                                         /* bad request, ':' required */
1409                                         break;
1410                                 }
1411
1412 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
1413                                 {
1414                                         char *cipher;
1415                                         char *pp;
1416
1417                                 if (strncmp(p, request, u-request) != 0) {
1418                                                 /* user uncompared */
1419                                                 continue;
1420                                         }
1421                                         pp = strchr(p, ':');
1422                                         if (pp && pp[1] == '$' && pp[2] == '1' &&
1423                                                         pp[3] == '$' && pp[4]) {
1424                                                 pp++;
1425                                                 cipher = pw_encrypt(u+1, pp);
1426                                                 if (strcmp(cipher, pp) == 0)
1427                                                         goto set_remoteuser_var;   /* Ok */
1428                                                 /* unauthorized */
1429                                                 continue;
1430                                         }
1431                                 }
1432 #endif
1433                                 if (strcmp(p, request) == 0) {
1434 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
1435 set_remoteuser_var:
1436 #endif
1437                                         config->remoteuser = strdup(request);
1438                                         if (config->remoteuser)
1439                                                 config->remoteuser[(u - request)] = 0;
1440                                         return 1;   /* Ok */
1441                                 }
1442                                 /* unauthorized */
1443                         }
1444                 }
1445         }   /* for */
1446
1447         return prev == NULL;
1448 }
1449
1450 #endif  /* CONFIG_FEATURE_HTTPD_BASIC_AUTH */
1451
1452 /****************************************************************************
1453  *
1454  > $Function: handle_sigalrm()
1455  *
1456  * $Description: Handle timeouts
1457  *
1458  ****************************************************************************/
1459
1460 static void handle_sigalrm(int sig)
1461 {
1462                 sendHeaders(HTTP_REQUEST_TIMEOUT);
1463                 config->alarm_signaled = sig;
1464 }
1465
1466 /****************************************************************************
1467  *
1468  > $Function: handleIncoming()
1469  *
1470  * $Description: Handle an incoming http request.
1471  *
1472  ****************************************************************************/
1473 static void handleIncoming(void)
1474 {
1475         char *buf = config->buf;
1476         char *url;
1477         char *purl;
1478         int  blank = -1;
1479         char *test;
1480         struct stat sb;
1481         int ip_allowed;
1482 #if ENABLE_FEATURE_HTTPD_CGI
1483         const char *prequest = request_GET;
1484         long length=0;
1485         char *cookie = 0;
1486         char *content_type = 0;
1487 #endif
1488         fd_set s_fd;
1489         struct timeval tv;
1490         int retval;
1491         struct sigaction sa;
1492
1493 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1494         int credentials = -1;  /* if not requred this is Ok */
1495 #endif
1496
1497         sa.sa_handler = handle_sigalrm;
1498         sigemptyset(&sa.sa_mask);
1499         sa.sa_flags = 0; /* no SA_RESTART */
1500         sigaction(SIGALRM, &sa, NULL);
1501
1502         do {
1503                 int count;
1504
1505                 (void) alarm(TIMEOUT);
1506                 if (getLine() <= 0)
1507                         break;  /* closed */
1508
1509                 purl = strpbrk(buf, " \t");
1510                 if (purl == NULL) {
1511 BAD_REQUEST:
1512                         sendHeaders(HTTP_BAD_REQUEST);
1513                         break;
1514                 }
1515                 *purl = 0;
1516 #if ENABLE_FEATURE_HTTPD_CGI
1517                 if (strcasecmp(buf, prequest) != 0) {
1518                         prequest = "POST";
1519                         if (strcasecmp(buf, prequest) != 0) {
1520                                 sendHeaders(HTTP_NOT_IMPLEMENTED);
1521                                 break;
1522                         }
1523                 }
1524 #else
1525                 if (strcasecmp(buf, request_GET) != 0) {
1526                         sendHeaders(HTTP_NOT_IMPLEMENTED);
1527                         break;
1528                 }
1529 #endif
1530                 *purl = ' ';
1531                 count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank);
1532
1533                 if (count < 1 || buf[0] != '/') {
1534                         /* Garbled request/URL */
1535                         goto BAD_REQUEST;
1536                 }
1537                 url = alloca(strlen(buf) + 12);      /* + sizeof("/index.html\0") */
1538                 if (url == NULL) {
1539                         sendHeaders(HTTP_INTERNAL_SERVER_ERROR);
1540                         break;
1541                 }
1542                 strcpy(url, buf);
1543                 /* extract url args if present */
1544                 test = strchr(url, '?');
1545                 if (test) {
1546                         *test++ = 0;
1547                         config->query = test;
1548                 }
1549
1550                 test = decodeString(url, 0);
1551                 if (test == NULL)
1552                         goto BAD_REQUEST;
1553                 if (test == (buf+1)) {
1554                         sendHeaders(HTTP_NOT_FOUND);
1555                         break;
1556                 }
1557                 /* algorithm stolen from libbb bb_simplify_path(),
1558                          but don't strdup and reducing trailing slash and protect out root */
1559                 purl = test = url;
1560
1561                 do {
1562                         if (*purl == '/') {
1563                                 if (*test == '/') {        /* skip duplicate (or initial) slash */
1564                                         continue;
1565                                 } else if (*test == '.') {
1566                                         if (test[1] == '/' || test[1] == 0) { /* skip extra '.' */
1567                                                 continue;
1568                                         } else if ((test[1] == '.') && (test[2] == '/' || test[2] == 0)) {
1569                                                 ++test;
1570                                                 if (purl == url) {
1571                                                         /* protect out root */
1572                                                         goto BAD_REQUEST;
1573                                                 }
1574                                                 while (*--purl != '/') /* omit previous dir */;
1575                                                 continue;
1576                                         }
1577                                 }
1578                         }
1579                         *++purl = *test;
1580                 } while (*++test);
1581
1582                 *++purl = 0;        /* so keep last character */
1583                 test = purl;        /* end ptr */
1584
1585                 /* If URL is directory, adding '/' */
1586                 if (test[-1] != '/') {
1587                         if (is_directory(url + 1, 1, &sb)) {
1588                                 config->httpd_found.found_moved_temporarily = url;
1589                         }
1590                 }
1591 #if DEBUG
1592                 fprintf(stderr, "url='%s', args=%s\n", url, config->query);
1593 #endif
1594
1595                 test = url;
1596                 ip_allowed = checkPermIP();
1597                 while (ip_allowed && (test = strchr(test + 1, '/')) != NULL) {
1598                         /* have path1/path2 */
1599                         *test = '\0';
1600                         if (is_directory(url + 1, 1, &sb)) {
1601                                 /* may be having subdir config */
1602                                 parse_conf(url + 1, SUBDIR_PARSE);
1603                                 ip_allowed = checkPermIP();
1604                         }
1605                         *test = '/';
1606                 }
1607                 if (blank >= 0) {
1608                         // read until blank line for HTTP version specified, else parse immediate
1609                         while (1) {
1610                                 alarm(TIMEOUT);
1611                                 count = getLine();
1612                                 if (count <= 0)
1613                                         break;
1614
1615 #if DEBUG
1616                                 fprintf(stderr, "Header: '%s'\n", buf);
1617 #endif
1618
1619 #if ENABLE_FEATURE_HTTPD_CGI
1620                                 /* try and do our best to parse more lines */
1621                                 if ((strncasecmp(buf, Content_length, 15) == 0)) {
1622                                         if (prequest != request_GET)
1623                                                 length = strtol(buf + 15, 0, 0); // extra read only for POST
1624                                 } else if ((strncasecmp(buf, "Cookie:", 7) == 0)) {
1625                                         for (test = buf + 7; isspace(*test); test++)
1626                                                   ;
1627                                         cookie = strdup(test);
1628                                 } else if ((strncasecmp(buf, "Content-Type:", 13) == 0)) {
1629                                         for (test = buf + 13; isspace(*test); test++)
1630                                                   ;
1631                                         content_type = strdup(test);
1632                                 } else if ((strncasecmp(buf, "Referer:", 8) == 0)) {
1633                                         for (test = buf + 8; isspace(*test); test++)
1634                                                   ;
1635                                         config->referer = strdup(test);
1636                                 }
1637 #endif
1638
1639 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1640                                 if (strncasecmp(buf, "Authorization:", 14) == 0) {
1641                                         /* We only allow Basic credentials.
1642                                          * It shows up as "Authorization: Basic <userid:password>" where
1643                                          * the userid:password is base64 encoded.
1644                                          */
1645                                         for (test = buf + 14; isspace(*test); test++)
1646                                                 ;
1647                                         if (strncasecmp(test, "Basic", 5) != 0)
1648                                                 continue;
1649
1650                                         test += 5;  /* decodeBase64() skiping space self */
1651                                         decodeBase64(test);
1652                                         credentials = checkPerm(url, test);
1653                                 }
1654 #endif          /* CONFIG_FEATURE_HTTPD_BASIC_AUTH */
1655
1656                         } /* while extra header reading */
1657                 }
1658                 (void) alarm(0);
1659                 if (config->alarm_signaled)
1660                         break;
1661
1662                 if (strcmp(strrchr(url, '/') + 1, httpd_conf) == 0 || ip_allowed == 0) {
1663                                 /* protect listing [/path]/httpd_conf or IP deny */
1664 #if ENABLE_FEATURE_HTTPD_CGI
1665 FORBIDDEN:      /* protect listing /cgi-bin */
1666 #endif
1667                         sendHeaders(HTTP_FORBIDDEN);
1668                         break;
1669                 }
1670
1671 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1672                 if (credentials <= 0 && checkPerm(url, ":") == 0) {
1673                         sendHeaders(HTTP_UNAUTHORIZED);
1674                         break;
1675                 }
1676 #endif
1677
1678                 if (config->httpd_found.found_moved_temporarily) {
1679                         sendHeaders(HTTP_MOVED_TEMPORARILY);
1680 #if DEBUG
1681                         /* clear unforked memory flag */
1682                         config->httpd_found.found_moved_temporarily = NULL;
1683 #endif
1684                         break;
1685                 }
1686
1687                 test = url + 1;      /* skip first '/' */
1688
1689 #if ENABLE_FEATURE_HTTPD_CGI
1690                 /* if strange Content-Length */
1691                 if (length < 0)
1692                         break;
1693
1694                 if (strncmp(test, "cgi-bin", 7) == 0) {
1695                         if (test[7] == '/' && test[8] == 0)
1696                                 goto FORBIDDEN;     // protect listing cgi-bin/
1697                         sendCgi(url, prequest, length, cookie, content_type);
1698                 } else {
1699                         if (prequest != request_GET)
1700                                 sendHeaders(HTTP_NOT_IMPLEMENTED);
1701                         else {
1702 #endif  /* CONFIG_FEATURE_HTTPD_CGI */
1703                                 if (purl[-1] == '/')
1704                                         strcpy(purl, "index.html");
1705                                 if (stat(test, &sb) == 0) {
1706                                         config->ContentLength = sb.st_size;
1707                                         config->last_mod = sb.st_mtime;
1708                                 }
1709                                 sendFile(test);
1710 #if ENABLE_FEATURE_HTTPD_WITHOUT_INETD
1711                                 /* unset if non inetd looped */
1712                                 config->ContentLength = -1;
1713 #endif
1714
1715 #if ENABLE_FEATURE_HTTPD_CGI
1716                         }
1717                 }
1718 #endif
1719
1720         } while (0);
1721
1722
1723 #if ENABLE_FEATURE_HTTPD_WITHOUT_INETD
1724 /* from inetd don't looping: freeing, closing automatic from exit always */
1725 # if DEBUG
1726         fprintf(stderr, "closing socket\n");
1727 # endif
1728 # ifdef CONFIG_FEATURE_HTTPD_CGI
1729         free(cookie);
1730         free(content_type);
1731         free(config->referer);
1732 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1733         free(config->remoteuser);
1734 #endif
1735 # endif
1736 #endif  /* CONFIG_FEATURE_HTTPD_WITHOUT_INETD */
1737         shutdown(a_c_w, SHUT_WR);
1738
1739         /* Properly wait for remote to closed */
1740         FD_ZERO(&s_fd);
1741         FD_SET(a_c_r, &s_fd);
1742
1743         do {
1744                 tv.tv_sec = 2;
1745                 tv.tv_usec = 0;
1746                 retval = select(a_c_r + 1, &s_fd, NULL, NULL, &tv);
1747         } while (retval > 0 && read(a_c_r, buf, sizeof(config->buf) > 0));
1748
1749         shutdown(a_c_r, SHUT_RD);
1750 #if ENABLE_FEATURE_HTTPD_WITHOUT_INETD
1751         close(config->accepted_socket);
1752 #endif  /* CONFIG_FEATURE_HTTPD_WITHOUT_INETD */
1753 }
1754
1755 /****************************************************************************
1756  *
1757  > $Function: miniHttpd()
1758  *
1759  * $Description: The main http server function.
1760  *
1761  *   Given an open socket fildes, listen for new connections and farm out
1762  *   the processing as a forked process.
1763  *
1764  * $Parameters:
1765  *      (int) server. . . The server socket fildes.
1766  *
1767  * $Return: (int) . . . . Always 0.
1768  *
1769  ****************************************************************************/
1770 #if ENABLE_FEATURE_HTTPD_WITHOUT_INETD
1771 static int miniHttpd(int server)
1772 {
1773         fd_set readfd, portfd;
1774
1775         FD_ZERO(&portfd);
1776         FD_SET(server, &portfd);
1777
1778         /* copy the ports we are watching to the readfd set */
1779         while (1) {
1780                 readfd = portfd;
1781
1782                 /* Now wait INDEFINITELY on the set of sockets! */
1783                 if (select(server + 1, &readfd, 0, 0, 0) > 0) {
1784                         if (FD_ISSET(server, &readfd)) {
1785                                 int on;
1786                                 struct sockaddr_in fromAddr;
1787
1788                                 socklen_t fromAddrLen = sizeof(fromAddr);
1789                                 int s = accept(server,
1790                                            (struct sockaddr *)&fromAddr, &fromAddrLen);
1791
1792                                 if (s < 0) {
1793                                         continue;
1794                                 }
1795                                 config->accepted_socket = s;
1796                                 config->rmt_ip = ntohl(fromAddr.sin_addr.s_addr);
1797 #if ENABLE_FEATURE_HTTPD_CGI || DEBUG
1798                                 sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
1799                                                 (unsigned char)(config->rmt_ip >> 24),
1800                                                 (unsigned char)(config->rmt_ip >> 16),
1801                                                 (unsigned char)(config->rmt_ip >> 8),
1802                                                     config->rmt_ip & 0xff);
1803                                 config->port = ntohs(fromAddr.sin_port);
1804 #if DEBUG
1805                                 bb_error_msg("connection from IP=%s, port %u",
1806                                                 config->rmt_ip_str, config->port);
1807 #endif
1808 #endif /* CONFIG_FEATURE_HTTPD_CGI */
1809
1810                                 /*  set the KEEPALIVE option to cull dead connections */
1811                                 on = 1;
1812                                 setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, sizeof(on));
1813
1814 #if !DEBUG
1815                                 if (fork() == 0)
1816 #endif
1817                                 {
1818                                         /* This is the spawned thread */
1819 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1820                                         /* protect reload config, may be confuse checking */
1821                                         signal(SIGHUP, SIG_IGN);
1822 #endif
1823                                         handleIncoming();
1824 #if !DEBUG
1825                                         exit(0);
1826 #endif
1827                                 }
1828                                 close(s);
1829                         }
1830                 }
1831         } // while (1)
1832         return 0;
1833 }
1834
1835 #else
1836         /* from inetd */
1837
1838 static int miniHttpd(void)
1839 {
1840         struct sockaddr_in fromAddrLen;
1841         socklen_t sinlen = sizeof(struct sockaddr_in);
1842
1843         getpeername(0, (struct sockaddr *)&fromAddrLen, &sinlen);
1844         config->rmt_ip = ntohl(fromAddrLen.sin_addr.s_addr);
1845 #if ENABLE_FEATURE_HTTPD_CGI
1846         sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
1847                                 (unsigned char)(config->rmt_ip >> 24),
1848                                 (unsigned char)(config->rmt_ip >> 16),
1849                                 (unsigned char)(config->rmt_ip >> 8),
1850                                                     config->rmt_ip & 0xff);
1851 #endif
1852         config->port = ntohs(fromAddrLen.sin_port);
1853         handleIncoming();
1854         return 0;
1855 }
1856 #endif  /* CONFIG_FEATURE_HTTPD_WITHOUT_INETD */
1857
1858 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1859 static void sighup_handler(int sig)
1860 {
1861         /* set and reset */
1862         struct sigaction sa;
1863
1864         parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
1865         sa.sa_handler = sighup_handler;
1866         sigemptyset(&sa.sa_mask);
1867         sa.sa_flags = SA_RESTART;
1868         sigaction(SIGHUP, &sa, NULL);
1869 }
1870 #endif
1871
1872 enum httpd_opts_nums {
1873         c_opt_config_file = 0,
1874         d_opt_decode_url,
1875         h_opt_home_httpd,
1876         USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
1877         USE_FEATURE_HTTPD_BASIC_AUTH(r_opt_realm,)
1878         USE_FEATURE_HTTPD_AUTH_MD5(m_opt_md5,)
1879         USE_FEATURE_HTTPD_SETUID(u_opt_setuid,)
1880         USE_FEATURE_HTTPD_WITHOUT_INETD(p_opt_port,)
1881 };
1882
1883 static const char httpd_opts[] = "c:d:h:"
1884         USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
1885         USE_FEATURE_HTTPD_BASIC_AUTH("r:")
1886         USE_FEATURE_HTTPD_AUTH_MD5("m:")
1887         USE_FEATURE_HTTPD_SETUID("u:")
1888         USE_FEATURE_HTTPD_WITHOUT_INETD("p:");
1889
1890 #define OPT_CONFIG_FILE (1<<c_opt_config_file)
1891 #define OPT_DECODE_URL  (1<<d_opt_decode_url)
1892 #define OPT_HOME_HTTPD  (1<<h_opt_home_httpd)
1893
1894 #define OPT_ENCODE_URL  USE_FEATURE_HTTPD_ENCODE_URL_STR((1<<e_opt_encode_url)) \
1895                                                 SKIP_FEATURE_HTTPD_ENCODE_URL_STR(0)
1896
1897 #define OPT_REALM       USE_FEATURE_HTTPD_BASIC_AUTH((1<<r_opt_realm)) \
1898                                                 SKIP_FEATURE_HTTPD_BASIC_AUTH(0)
1899
1900 #define OPT_MD5         USE_FEATURE_HTTPD_AUTH_MD5((1<<m_opt_md5)) \
1901                                                 SKIP_FEATURE_HTTPD_AUTH_MD5(0)
1902
1903 #define OPT_SETUID      USE_FEATURE_HTTPD_SETUID((1<<u_opt_setuid)) \
1904                                                 SKIP_FEATURE_HTTPD_SETUID(0)
1905
1906 #define OPT_PORT        USE_FEATURE_HTTPD_WITHOUT_INETD((1<<p_opt_port)) \
1907                                                 SKIP_FEATURE_HTTPD_WITHOUT_INETD(0)
1908
1909
1910 int httpd_main(int argc, char *argv[])
1911 {
1912         unsigned opt;
1913         const char *home_httpd = home;
1914         char *url_for_decode;
1915         USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
1916         USE_FEATURE_HTTPD_WITHOUT_INETD(const char *s_port;)
1917         USE_FEATURE_HTTPD_WITHOUT_INETD(int server;)
1918
1919         USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
1920         USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
1921
1922         USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
1923
1924         config = xzalloc(sizeof(*config));
1925 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1926         config->realm = "Web Server Authentication";
1927 #endif
1928
1929 #if ENABLE_FEATURE_HTTPD_WITHOUT_INETD
1930         config->port = 80;
1931 #endif
1932
1933         config->ContentLength = -1;
1934
1935         opt = getopt32(argc, argv, httpd_opts,
1936                         &(config->configFile), &url_for_decode, &home_httpd
1937                         USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
1938                         USE_FEATURE_HTTPD_BASIC_AUTH(, &(config->realm))
1939                         USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
1940                         USE_FEATURE_HTTPD_SETUID(, &s_ugid)
1941                         USE_FEATURE_HTTPD_WITHOUT_INETD(, &s_port)
1942                 );
1943
1944         if (opt & OPT_DECODE_URL) {
1945                 printf("%s", decodeString(url_for_decode, 1));
1946                 return 0;
1947         }
1948 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
1949         if (opt & OPT_ENCODE_URL) {
1950                 printf("%s", encodeString(url_for_encode));
1951                 return 0;
1952         }
1953 #endif
1954 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
1955         if (opt & OPT_MD5) {
1956                 puts(pw_encrypt(pass, "$1$"));
1957                 return 0;
1958         }
1959 #endif
1960 #if ENABLE_FEATURE_HTTPD_WITHOUT_INETD
1961         if (opt & OPT_PORT)
1962                 config->port = bb_xgetlarg(s_port, 10, 1, 0xffff);
1963 #if ENABLE_FEATURE_HTTPD_SETUID
1964         if (opt & OPT_SETUID) {
1965                 char *e;
1966                 // FIXME: what the default group should be?
1967                 ugid.gid = -1;
1968                 ugid.uid = strtoul(s_ugid, &e, 0);
1969                 if (*e == ':') {
1970                         e++;
1971                         ugid.gid = strtoul(e, &e, 0);
1972                 }
1973                 if (*e != '\0') {
1974                         /* not integer */
1975                         if (!uidgid_get(&ugid, s_ugid))
1976                                 bb_error_msg_and_die("unrecognized user[:group] "
1977                                                 "name '%s'", s_ugid);
1978                 }
1979         }
1980 #endif
1981 #endif
1982
1983         xchdir(home_httpd);
1984 #if ENABLE_FEATURE_HTTPD_WITHOUT_INETD
1985         server = openServer();
1986 # ifdef CONFIG_FEATURE_HTTPD_SETUID
1987         /* drop privileges */
1988         if (opt & OPT_SETUID) {
1989                 if (ugid.gid != (gid_t)-1) {
1990                         // FIXME: needed?
1991                         //if (setgroups(1, &ugid.gid) == -1)
1992                         //      bb_perror_msg_and_die("setgroups");
1993                         xsetgid(ugid.gid);
1994                 }
1995                 xsetuid(ugid.uid);
1996         }
1997 # endif
1998 #endif
1999
2000 #if ENABLE_FEATURE_HTTPD_CGI
2001         {
2002                 char *p = getenv("PATH");
2003                 if (p) {
2004                         p = xstrdup(p);
2005                 }
2006                 clearenv();
2007                 if (p)
2008                         setenv("PATH", p, 1);
2009 # ifdef CONFIG_FEATURE_HTTPD_WITHOUT_INETD
2010                 addEnvPort("SERVER");
2011 # endif
2012         }
2013 #endif
2014
2015 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
2016         sighup_handler(0);
2017 #else
2018         parse_conf(default_path_httpd_conf, FIRST_PARSE);
2019 #endif
2020
2021 #if ENABLE_FEATURE_HTTPD_WITHOUT_INETD
2022 # if !DEBUG
2023         xdaemon(1, 0);     /* don't change curent directory */
2024 # endif
2025         return miniHttpd(server);
2026 #else
2027         return miniHttpd();
2028 #endif
2029 }