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 #define TIMEOUT 60
 101
 102 // Note: busybox xfuncs are not used because we want the server to keep running
 103 //       if something bad happens due to a malformed user request.
 104 //       As a result, all memory allocation after daemonize
 105 //       is checked rigorously
 106
 107 //#define DEBUG 1
 108
 109 #ifndef DEBUG
 110 # define DEBUG 0
 111 #endif
 112
 113 #define MAX_MEMORY_BUFF 8192    /* IO buffer */
 114
 115 typedef struct HT_ACCESS {
 116         char *after_colon;
 117         struct HT_ACCESS *next;
 118         char before_colon[1];         /* really bigger, must last */
 119 } Htaccess;
 120
 121 typedef struct HT_ACCESS_IP {
 122         unsigned int ip;
 123         unsigned int mask;
 124         int allow_deny;
 125         struct HT_ACCESS_IP *next;
 126 } Htaccess_IP;
 127
 128 typedef struct {
 129         char buf[MAX_MEMORY_BUFF];
 130
 131         USE_FEATURE_HTTPD_BASIC_AUTH(const char *realm;)
 132         USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;)
 133
 134         const char *query;
 135
 136         USE_FEATURE_HTTPD_CGI(char *referer;)
 137
 138         const char *configFile;
 139
 140         unsigned int rmt_ip;
 141 #if ENABLE_FEATURE_HTTPD_CGI || DEBUG
 142         char rmt_ip_str[16];     /* for set env REMOTE_ADDR */
 143 #endif
 144         unsigned port;           /* server initial port and for
 145                                                       set env REMOTE_PORT */
 146         const char *found_mime_type;
 147         const char *found_moved_temporarily;
 148
 149         off_t ContentLength;          /* -1 - unknown */
 150         time_t last_mod;
 151
 152         Htaccess_IP *ip_a_d;          /* config allow/deny lines */
 153         int flg_deny_all;
 154 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 155         Htaccess *auth;               /* config user:password lines */
 156 #endif
 157 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 158         Htaccess *mime_a;             /* config mime types */
 159 #endif
 160
 161         int server_socket;
 162         int accepted_socket;
 163         volatile int alarm_signaled;
 164
 165 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 166         Htaccess *script_i;           /* config script interpreters */
 167 #endif
 168 } HttpdConfig;
 169
 170 static HttpdConfig *config;
 171
 172 static const char request_GET[] = "GET";    /* size algorithmic optimize */
 173
 174 static const char* const suffixTable [] = {
 175 /* Warning: shorted equivalent suffix in one line must be first */
 176         ".htm.html", "text/html",
 177         ".jpg.jpeg", "image/jpeg",
 178         ".gif", "image/gif",
 179         ".png", "image/png",
 180         ".txt.h.c.cc.cpp", "text/plain",
 181         ".css", "text/css",
 182         ".wav", "audio/wav",
 183         ".avi", "video/x-msvideo",
 184         ".qt.mov", "video/quicktime",
 185         ".mpe.mpeg", "video/mpeg",
 186         ".mid.midi", "audio/midi",
 187         ".mp3", "audio/mpeg",
 188 #if 0                        /* unpopular */
 189         ".au", "audio/basic",
 190         ".pac", "application/x-ns-proxy-autoconfig",
 191         ".vrml.wrl", "model/vrml",
 192 #endif
 193         0, "application/octet-stream" /* default */
 194 };
 195
 196 typedef enum {
 197         HTTP_OK = 200,
 198         HTTP_MOVED_TEMPORARILY = 302,
 199         HTTP_BAD_REQUEST = 400,       /* malformed syntax */
 200         HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */
 201         HTTP_NOT_FOUND = 404,
 202         HTTP_FORBIDDEN = 403,
 203         HTTP_REQUEST_TIMEOUT = 408,
 204         HTTP_NOT_IMPLEMENTED = 501,   /* used for unrecognized requests */
 205         HTTP_INTERNAL_SERVER_ERROR = 500,
 206 #if 0 /* future use */
 207         HTTP_CONTINUE = 100,
 208         HTTP_SWITCHING_PROTOCOLS = 101,
 209         HTTP_CREATED = 201,
 210         HTTP_ACCEPTED = 202,
 211         HTTP_NON_AUTHORITATIVE_INFO = 203,
 212         HTTP_NO_CONTENT = 204,
 213         HTTP_MULTIPLE_CHOICES = 300,
 214         HTTP_MOVED_PERMANENTLY = 301,
 215         HTTP_NOT_MODIFIED = 304,
 216         HTTP_PAYMENT_REQUIRED = 402,
 217         HTTP_BAD_GATEWAY = 502,
 218         HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */
 219         HTTP_RESPONSE_SETSIZE = 0xffffffff
 220 #endif
 221 } HttpResponseNum;
 222
 223 typedef struct {
 224         HttpResponseNum type;
 225         const char *name;
 226         const char *info;
 227 } HttpEnumString;
 228
 229 static const HttpEnumString httpResponseNames[] = {
 230         { HTTP_OK, "OK", NULL },
 231         { HTTP_MOVED_TEMPORARILY, "Found", "Directories must end with a slash." },
 232         { HTTP_REQUEST_TIMEOUT, "Request Timeout",
 233                 "No request appeared within a reasonable time period." },
 234         { HTTP_NOT_IMPLEMENTED, "Not Implemented",
 235                 "The requested method is not recognized by this server." },
 236 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 237         { HTTP_UNAUTHORIZED, "Unauthorized", "" },
 238 #endif
 239         { HTTP_NOT_FOUND, "Not Found",
 240                 "The requested URL was not found on this server." },
 241         { HTTP_BAD_REQUEST, "Bad Request", "Unsupported method." },
 242         { HTTP_FORBIDDEN, "Forbidden", "" },
 243         { HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error",
 244                 "Internal Server Error" },
 245 #if 0                               /* not implemented */
 246         { HTTP_CREATED, "Created" },
 247         { HTTP_ACCEPTED, "Accepted" },
 248         { HTTP_NO_CONTENT, "No Content" },
 249         { HTTP_MULTIPLE_CHOICES, "Multiple Choices" },
 250         { HTTP_MOVED_PERMANENTLY, "Moved Permanently" },
 251         { HTTP_NOT_MODIFIED, "Not Modified" },
 252         { HTTP_BAD_GATEWAY, "Bad Gateway", "" },
 253         { HTTP_SERVICE_UNAVAILABLE, "Service Unavailable", "" },
 254 #endif
 255 };
 256
 257
 258 static const char RFC1123FMT[] = "%a, %d %b %Y %H:%M:%S GMT";
 259
 260
 261 #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1)
 262
 263
 264 static int scan_ip(const char **ep, unsigned int *ip, unsigned char endc)
 265 {
 266         const char *p = *ep;
 267         int auto_mask = 8;
 268         int j;
 269
 270         *ip = 0;
 271         for (j = 0; j < 4; j++) {
 272                 unsigned int octet;
 273
 274                 if ((*p < '0' || *p > '9') && (*p != '/' || j == 0) && *p != 0)
 275                         return -auto_mask;
 276                 octet = 0;
 277                 while (*p >= '0' && *p <= '9') {
 278                         octet *= 10;
 279                         octet += *p - '0';
 280                         if (octet > 255)
 281                                 return -auto_mask;
 282                         p++;
 283                 }
 284                 if (*p == '.')
 285                         p++;
 286                 if (*p != '/' && *p != 0)
 287                         auto_mask += 8;
 288                 *ip = ((*ip) << 8) | octet;
 289         }
 290         if (*p != 0) {
 291                 if (*p != endc)
 292                         return -auto_mask;
 293                 p++;
 294                 if (*p == 0)
 295                         return -auto_mask;
 296         }
 297         *ep = p;
 298         return auto_mask;
 299 }
 300
 301 static int scan_ip_mask(const char *ipm, unsigned int *ip, unsigned int *mask)
 302 {
 303         int i;
 304         unsigned int msk;
 305
 306         i = scan_ip(&ipm, ip, '/');
 307         if (i < 0)
 308                 return i;
 309         if (*ipm) {
 310                 const char *p = ipm;
 311
 312                 i = 0;
 313                 while (*p) {
 314                         if (*p < '0' || *p > '9') {
 315                                 if (*p == '.') {
 316                                         i = scan_ip(&ipm, mask, 0);
 317                                         return i != 32;
 318                                 }
 319                                 return -1;
 320                         }
 321                         i *= 10;
 322                         i += *p - '0';
 323                         p++;
 324                 }
 325         }
 326         if (i > 32 || i < 0)
 327                 return -1;
 328         msk = 0x80000000;
 329         *mask = 0;
 330         while (i > 0) {
 331                 *mask |= msk;
 332                 msk >>= 1;
 333                 i--;
 334         }
 335         return 0;
 336 }
 337
 338 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 339 static void free_config_lines(Htaccess **pprev)
 340 {
 341         Htaccess *prev = *pprev;
 342
 343         while (prev) {
 344                 Htaccess *cur = prev;
 345
 346                 prev = cur->next;
 347                 free(cur);
 348         }
 349         *pprev = NULL;
 350 }
 351 #endif
 352
 353 /* flag */
 354 #define FIRST_PARSE          0
 355 #define SUBDIR_PARSE         1
 356 #define SIGNALED_PARSE       2
 357 #define FIND_FROM_HTTPD_ROOT 3
 358 /****************************************************************************
 359  *
 360  > $Function: parse_conf()
 361  *
 362  * $Description: parse configuration file into in-memory linked list.
 363  *
 364  * The first non-white character is examined to determine if the config line
 365  * is one of the following:
 366  *    .ext:mime/type   # new mime type not compiled into httpd
 367  *    [adAD]:from      # ip address allow/deny, * for wildcard
 368  *    /path:user:pass  # username/password
 369  *
 370  * Any previous IP rules are discarded.
 371  * If the flag argument is not SUBDIR_PARSE then all /path and mime rules
 372  * are also discarded.  That is, previous settings are retained if flag is
 373  * SUBDIR_PARSE.
 374  *
 375  * $Parameters:
 376  *      (const char *) path . . null for ip address checks, path for password
 377  *                              checks.
 378  *      (int) flag  . . . . . . the source of the parse request.
 379  *
 380  * $Return: (None)
 381  *
 382  ****************************************************************************/
 383 static void parse_conf(const char *path, int flag)
 384 {
 385         FILE *f;
 386 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 387         Htaccess *prev, *cur;
 388 #elif ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 389         Htaccess *cur;
 390 #endif
 391
 392         const char *cf = config->configFile;
 393         char buf[160];
 394         char *p0 = NULL;
 395         char *c, *p;
 396
 397         /* free previous ip setup if present */
 398         Htaccess_IP *pip = config->ip_a_d;
 399
 400         while (pip) {
 401                 Htaccess_IP *cur_ipl = pip;
 402
 403                 pip = cur_ipl->next;
 404                 free(cur_ipl);
 405         }
 406         config->ip_a_d = NULL;
 407
 408         config->flg_deny_all = 0;
 409
 410 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 411         /* retain previous auth and mime config only for subdir parse */
 412         if (flag != SUBDIR_PARSE) {
 413 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 414                 free_config_lines(&config->auth);
 415 #endif
 416 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 417                 free_config_lines(&config->mime_a);
 418 #endif
 419 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 420                 free_config_lines(&config->script_i);
 421 #endif
 422         }
 423 #endif
 424
 425         if (flag == SUBDIR_PARSE || cf == NULL) {
 426                 cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
 427                 if (cf == NULL) {
 428                         if (flag == FIRST_PARSE)
 429                         bb_error_msg_and_die(bb_msg_memory_exhausted);
 430                         return;
 431                 }
 432                 sprintf((char *)cf, "%s/%s", path, httpd_conf);
 433         }
 434
 435         while ((f = fopen(cf, "r")) == NULL) {
 436                 if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
 437                         /* config file not found, no changes to config */
 438                         return;
 439                 }
 440                 if (config->configFile && flag == FIRST_PARSE) /* if -c option given */
 441                         bb_perror_msg_and_die("%s", cf);
 442                 flag = FIND_FROM_HTTPD_ROOT;
 443                 cf = httpd_conf;
 444         }
 445
 446 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 447                 prev = config->auth;
 448 #endif
 449                 /* This could stand some work */
 450         while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
 451                 c = NULL;
 452                 for (p = p0; *p0 != 0 && *p0 != '#'; p0++) {
 453                         if (!isspace(*p0)) {
 454                                 *p++ = *p0;
 455                                 if (*p0 == ':' && c == NULL)
 456                                 c = p;
 457                         }
 458                 }
 459                 *p = 0;
 460
 461                 /* test for empty or strange line */
 462                 if (c == NULL || *c == 0)
 463                         continue;
 464                 p0 = buf;
 465                 if (*p0 == 'd')
 466                                 *p0 = 'D';
 467                 if (*c == '*') {
 468                         if (*p0 == 'D') {
 469                                 /* memorize deny all */
 470                                 config->flg_deny_all++;
 471                         }
 472                         /* skip default other "word:*" config lines */
 473                         continue;
 474                 }
 475
 476                 if (*p0 == 'a')
 477                         *p0 = 'A';
 478                 else if (*p0 != 'D' && *p0 != 'A'
 479 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 480                          && *p0 != '/'
 481 #endif
 482 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 483                          && *p0 != '.'
 484 #endif
 485 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 486                          && *p0 != '*'
 487 #endif
 488                         )
 489                          continue;
 490                 if (*p0 == 'A' || *p0 == 'D') {
 491                         /* storing current config IP line */
 492                         pip = calloc(1, sizeof(Htaccess_IP));
 493                         if (pip) {
 494                                 if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) {
 495                                         /* syntax IP{/mask} error detected, protect all */
 496                                         *p0 = 'D';
 497                                         pip->mask = 0;
 498                                 }
 499                                 pip->allow_deny = *p0;
 500                                 if (*p0 == 'D') {
 501                                         /* Deny:form_IP move top */
 502                                         pip->next = config->ip_a_d;
 503                                         config->ip_a_d = pip;
 504                                 } else {
 505                                         /* add to bottom A:form_IP config line */
 506                                         Htaccess_IP *prev_IP = config->ip_a_d;
 507
 508                                         if (prev_IP == NULL) {
 509                                                 config->ip_a_d = pip;
 510                                         } else {
 511                                                 while (prev_IP->next)
 512                                                         prev_IP = prev_IP->next;
 513                                                 prev_IP->next = pip;
 514                                         }
 515                                 }
 516                         }
 517                         continue;
 518                 }
 519 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 520                 if (*p0 == '/') {
 521                         /* make full path from httpd root / curent_path / config_line_path */
 522                         cf = flag == SUBDIR_PARSE ? path : "";
 523                         p0 = malloc(strlen(cf) + (c - buf) + 2 + strlen(c));
 524                         if (p0 == NULL)
 525                                 continue;
 526                         c[-1] = 0;
 527                         sprintf(p0, "/%s%s", cf, buf);
 528
 529                         /* another call bb_simplify_path */
 530                         cf = p = p0;
 531
 532                         do {
 533                                 if (*p == '/') {
 534                                         if (*cf == '/') {    /* skip duplicate (or initial) slash */
 535                                                 continue;
 536                                         } else if (*cf == '.') {
 537                                                 if (cf[1] == '/' || cf[1] == 0) { /* remove extra '.' */
 538                                                         continue;
 539                                                 } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == 0)) {
 540                                                         ++cf;
 541                                                         if (p > p0) {
 542                                                                 while (*--p != '/') /* omit previous dir */;
 543                                                         }
 544                                                         continue;
 545                                                 }
 546                                         }
 547                                 }
 548                                 *++p = *cf;
 549                         } while (*++cf);
 550
 551                         if ((p == p0) || (*p != '/')) {      /* not a trailing slash */
 552                                 ++p;                             /* so keep last character */
 553                         }
 554                         *p = 0;
 555                         sprintf(p0, "%s:%s", p0, c);
 556                 }
 557 #endif
 558
 559 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 560                 /* storing current config line */
 561                 cur = calloc(1, sizeof(Htaccess) + strlen(p0));
 562                 if (cur) {
 563                         cf = strcpy(cur->before_colon, p0);
 564                         c = strchr(cf, ':');
 565                         *c++ = 0;
 566                         cur->after_colon = c;
 567 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
 568                         if (*cf == '.') {
 569                                 /* config .mime line move top for overwrite previous */
 570                                 cur->next = config->mime_a;
 571                                 config->mime_a = cur;
 572                                 continue;
 573                         }
 574 #endif
 575 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
 576                         if (*cf == '*' && cf[1] == '.') {
 577                                 /* config script interpreter line move top for overwrite previous */
 578                                 cur->next = config->script_i;
 579                                 config->script_i = cur;
 580                                 continue;
 581                         }
 582 #endif
 583 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 584                         free(p0);
 585                         if (prev == NULL) {
 586                                 /* first line */
 587                                 config->auth = prev = cur;
 588                         } else {
 589                                 /* sort path, if current lenght eq or bigger then move up */
 590                                 Htaccess *prev_hti = config->auth;
 591                                 size_t l = strlen(cf);
 592                                 Htaccess *hti;
 593
 594                                 for (hti = prev_hti; hti; hti = hti->next) {
 595                                         if (l >= strlen(hti->before_colon)) {
 596                                                 /* insert before hti */
 597                                                 cur->next = hti;
 598                                                 if (prev_hti != hti) {
 599                                                         prev_hti->next = cur;
 600                                                 } else {
 601                                                         /* insert as top */
 602                                                         config->auth = cur;
 603                                                 }
 604                                                 break;
 605                                         }
 606                                         if (prev_hti != hti)
 607                                                 prev_hti = prev_hti->next;
 608                                 }
 609                                 if (!hti) {       /* not inserted, add to bottom */
 610                                         prev->next = cur;
 611                                         prev = cur;
 612                                 }
 613                         }
 614 #endif
 615                 }
 616 #endif
 617          }
 618          fclose(f);
 619 }
 620
 621 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
 622 /****************************************************************************
 623  *
 624  > $Function: encodeString()
 625  *
 626  * $Description: Given a string, html encode special characters.
 627  *   This is used for the -e command line option to provide an easy way
 628  *   for scripts to encode result data without confusing browsers.  The
 629  *   returned string pointer is memory allocated by malloc().
 630  *
 631  * $Parameters:
 632  *      (const char *) string . . The first string to encode.
 633  *
 634  * $Return: (char *) . . . .. . . A pointer to the encoded string.
 635  *
 636  * $Errors: Returns a null string ("") if memory is not available.
 637  *
 638  ****************************************************************************/
 639 static char *encodeString(const char *string)
 640 {
 641         /* take the simple route and encode everything */
 642         /* could possibly scan once to get length.     */
 643         int len = strlen(string);
 644         char *out = malloc(len * 6 + 1);
 645         char *p = out;
 646         char ch;
 647
 648         if (!out) return "";
 649         while ((ch = *string++)) {
 650                 // very simple check for what to encode
 651                 if (isalnum(ch)) *p++ = ch;
 652                 else p += sprintf(p, "&#%d;", (unsigned char) ch);
 653         }
 654         *p = 0;
 655         return out;
 656 }
 657 #endif          /* FEATURE_HTTPD_ENCODE_URL_STR */
 658
 659 /****************************************************************************
 660  *
 661  > $Function: decodeString()
 662  *
 663  * $Description: Given a URL encoded string, convert it to plain ascii.
 664  *   Since decoding always makes strings smaller, the decode is done in-place.
 665  *   Thus, callers should strdup() the argument if they do not want the
 666  *   argument modified.  The return is the original pointer, allowing this
 667  *   function to be easily used as arguments to other functions.
 668  *
 669  * $Parameters:
 670  *      (char *) string . . . The first string to decode.
 671  *      (int)    flag   . . . 1 if require decode '+' as ' ' for CGI
 672  *
 673  * $Return: (char *)  . . . . A pointer to the decoded string (same as input).
 674  *
 675  * $Errors: None
 676  *
 677  ****************************************************************************/
 678 static char *decodeString(char *orig, int flag_plus_to_space)
 679 {
 680         /* note that decoded string is always shorter than original */
 681         char *string = orig;
 682         char *ptr = string;
 683
 684         while (*ptr) {
 685                 if (*ptr == '+' && flag_plus_to_space) { *string++ = ' '; ptr++; }
 686                 else if (*ptr != '%') *string++ = *ptr++;
 687                 else {
 688                         unsigned int value1, value2;
 689
 690                         ptr++;
 691                         if (sscanf(ptr, "%1X", &value1) != 1 ||
 692                                                     sscanf(ptr+1, "%1X", &value2) != 1) {
 693                                 if (!flag_plus_to_space)
 694                                         return NULL;
 695                                 *string++ = '%';
 696                         } else {
 697                                 value1 = value1 * 16 + value2;
 698                                 if (value1 == '/' || value1 == 0)
 699                                         return orig+1;
 700                                 *string++ = value1;
 701                                 ptr += 2;
 702                         }
 703                 }
 704         }
 705         *string = '\0';
 706         return orig;
 707 }
 708
 709
 710 #if ENABLE_FEATURE_HTTPD_CGI
 711 /****************************************************************************
 712  * setenv helpers
 713  ****************************************************************************/
 714 static void setenv1(const char *name, const char *value)
 715 {
 716         if (!value)
 717                 value = "";
 718         setenv(name, value, 1);
 719 }
 720 static void setenv_long(const char *name, long value)
 721 {
 722         char buf[sizeof(value)*3 + 1];
 723         sprintf(buf, "%ld", value);
 724         setenv(name, buf, 1);
 725 }
 726 #endif
 727
 728 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 729 /****************************************************************************
 730  *
 731  > $Function: decodeBase64()
 732  *
 733  > $Description: Decode a base 64 data stream as per rfc1521.
 734  *    Note that the rfc states that none base64 chars are to be ignored.
 735  *    Since the decode always results in a shorter size than the input, it is
 736  *    OK to pass the input arg as an output arg.
 737  *
 738  * $Parameter:
 739  *      (char *) Data . . . . A pointer to a base64 encoded string.
 740  *                            Where to place the decoded data.
 741  *
 742  * $Return: void
 743  *
 744  * $Errors: None
 745  *
 746  ****************************************************************************/
 747 static void decodeBase64(char *Data)
 748 {
 749
 750         const unsigned char *in = (const unsigned char *)Data;
 751         // The decoded size will be at most 3/4 the size of the encoded
 752         unsigned long ch = 0;
 753         int i = 0;
 754
 755         while (*in) {
 756                 int t = *in++;
 757
 758                 if (t >= '0' && t <= '9')
 759                         t = t - '0' + 52;
 760                 else if (t >= 'A' && t <= 'Z')
 761                         t = t - 'A';
 762                 else if (t >= 'a' && t <= 'z')
 763                         t = t - 'a' + 26;
 764                 else if (t == '+')
 765                         t = 62;
 766                 else if (t == '/')
 767                         t = 63;
 768                 else if (t == '=')
 769                         t = 0;
 770                 else
 771                         continue;
 772
 773                 ch = (ch << 6) | t;
 774                 i++;
 775                 if (i == 4) {
 776                         *Data++ = (char) (ch >> 16);
 777                         *Data++ = (char) (ch >> 8);
 778                         *Data++ = (char) ch;
 779                         i = 0;
 780                 }
 781         }
 782         *Data = 0;
 783 }
 784 #endif
 785
 786
 787 /****************************************************************************
 788  *
 789  > $Function: openServer()
 790  *
 791  * $Description: create a listen server socket on the designated port.
 792  *
 793  * $Return: (int)  . . . A connection socket. -1 for errors.
 794  *
 795  * $Errors: None
 796  *
 797  ****************************************************************************/
 798 static int openServer(void)
 799 {
 800         struct sockaddr_in lsocket;
 801         int fd;
 802         int on = 1;
 803
 804         /* create the socket right now */
 805         /* inet_addr() returns a value that is already in network order */
 806         memset(&lsocket, 0, sizeof(lsocket));
 807         lsocket.sin_family = AF_INET;
 808         lsocket.sin_addr.s_addr = INADDR_ANY;
 809         lsocket.sin_port = htons(config->port);
 810         fd = xsocket(AF_INET, SOCK_STREAM, 0);
 811         /* tell the OS it's OK to reuse a previous address even though */
 812         /* it may still be in a close down state.  Allows bind to succeed. */
 813 #ifdef SO_REUSEPORT
 814         setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, (void *)&on, sizeof(on));
 815 #else
 816         setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (void *)&on, sizeof(on));
 817 #endif
 818         xbind(fd, (struct sockaddr *)&lsocket, sizeof(lsocket));
 819         xlisten(fd, 9);
 820         signal(SIGCHLD, SIG_IGN);   /* prevent zombie (defunct) processes */
 821         return fd;
 822 }
 823
 824 /****************************************************************************
 825  *
 826  > $Function: sendHeaders()
 827  *
 828  * $Description: Create and send HTTP response headers.
 829  *   The arguments are combined and sent as one write operation.  Note that
 830  *   IE will puke big-time if the headers are not sent in one packet and the
 831  *   second packet is delayed for any reason.
 832  *
 833  * $Parameter:
 834  *      (HttpResponseNum) responseNum . . . The result code to send.
 835  *
 836  * $Return: (int)  . . . . writing errors
 837  *
 838  ****************************************************************************/
 839 static int sendHeaders(HttpResponseNum responseNum)
 840 {
 841         char *buf = config->buf;
 842         const char *responseString = "";
 843         const char *infoString = 0;
 844         const char *mime_type;
 845         unsigned int i;
 846         time_t timer = time(0);
 847         char timeStr[80];
 848         int len;
 849
 850         for (i = 0;
 851                 i < (sizeof(httpResponseNames)/sizeof(httpResponseNames[0])); i++) {
 852                 if (httpResponseNames[i].type == responseNum) {
 853                         responseString = httpResponseNames[i].name;
 854                         infoString = httpResponseNames[i].info;
 855                         break;
 856                 }
 857         }
 858         /* error message is HTML */
 859         mime_type = responseNum == HTTP_OK ?
 860                                 config->found_mime_type : "text/html";
 861
 862         /* emit the current date */
 863         strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&timer));
 864         len = sprintf(buf,
 865                 "HTTP/1.0 %d %s\r\nContent-type: %s\r\n"
 866                 "Date: %s\r\nConnection: close\r\n",
 867                         responseNum, responseString, mime_type, timeStr);
 868
 869 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
 870         if (responseNum == HTTP_UNAUTHORIZED) {
 871                 len += sprintf(buf+len, "WWW-Authenticate: Basic realm=\"%s\"\r\n",
 872                                                                     config->realm);
 873         }
 874 #endif
 875         if (responseNum == HTTP_MOVED_TEMPORARILY) {
 876                 len += sprintf(buf+len, "Location: %s/%s%s\r\n",
 877                                 config->found_moved_temporarily,
 878                                 (config->query ? "?" : ""),
 879                                 (config->query ? config->query : ""));
 880         }
 881
 882         if (config->ContentLength != -1) {    /* file */
 883                 strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&config->last_mod));
 884                 len += sprintf(buf+len, "Last-Modified: %s\r\n%s %"OFF_FMT"\r\n",
 885                                 timeStr, "Content-length:", (off_t) config->ContentLength);
 886         }
 887         strcat(buf, "\r\n");
 888         len += 2;
 889         if (infoString) {
 890                 len += sprintf(buf+len,
 891                                 "<HEAD><TITLE>%d %s</TITLE></HEAD>\n"
 892                                 "<BODY><H1>%d %s</H1>\n%s\n</BODY>\n",
 893                                 responseNum, responseString,
 894                                 responseNum, responseString, infoString);
 895         }
 896 #if DEBUG
 897         fprintf(stderr, "headers: '%s'\n", buf);
 898 #endif
 899         return full_write(config->accepted_socket, buf, len);
 900 }
 901
 902 /****************************************************************************
 903  *
 904  > $Function: getLine()
 905  *
 906  * $Description: Read from the socket until an end of line char found.
 907  *
 908  *   Characters are read one at a time until an eol sequence is found.
 909  *
 910  * $Return: (int) . . . . number of characters read.  -1 if error.
 911  *
 912  ****************************************************************************/
 913 static int getLine(void)
 914 {
 915         int count = 0;
 916         char *buf = config->buf;
 917
 918         while (read(config->accepted_socket, buf + count, 1) == 1) {
 919                 if (buf[count] == '\r') continue;
 920                 if (buf[count] == '\n') {
 921                         buf[count] = 0;
 922                         return count;
 923                 }
 924                 if (count < (MAX_MEMORY_BUFF-1))      /* check overflow */
 925                         count++;
 926         }
 927         if (count) return count;
 928         else return -1;
 929 }
 930
 931 #if ENABLE_FEATURE_HTTPD_CGI
 932 /****************************************************************************
 933  *
 934  > $Function: sendCgi()
 935  *
 936  * $Description: Execute a CGI script and send it's stdout back
 937  *
 938  *   Environment variables are set up and the script is invoked with pipes
 939  *   for stdin/stdout.  If a post is being done the script is fed the POST
 940  *   data in addition to setting the QUERY_STRING variable (for GETs or POSTs).
 941  *
 942  * $Parameters:
 943  *      (const char *) url . . . . . . The requested URL (with leading /).
 944  *      (int bodyLen)  . . . . . . . . Length of the post body.
 945  *      (const char *cookie) . . . . . For set HTTP_COOKIE.
 946  *      (const char *content_type) . . For set CONTENT_TYPE.
 947
 948  *
 949  * $Return: (char *)  . . . . A pointer to the decoded string (same as input).
 950  *
 951  * $Errors: None
 952  *
 953  ****************************************************************************/
 954 static int sendCgi(const char *url,
 955                 const char *request, int bodyLen, const char *cookie,
 956                 const char *content_type)
 957 {
 958         int fromCgi[2];  /* pipe for reading data from CGI */
 959         int toCgi[2];    /* pipe for sending data to CGI */
 960
 961         static char * argp[] = { 0, 0 };
 962         int pid = 0;
 963         int inFd;
 964         int outFd;
 965         int firstLine = 1;
 966
 967         if (pipe(fromCgi) != 0)
 968                 return 0;
 969         if (pipe(toCgi) != 0)
 970                 return 0;
 971         pid = fork();
 972         if (pid < 0)
 973                 return 0;
 974
 975         do {
 976                 if (!pid) {
 977                         /* child process */
 978                         char *script;
 979                         char *purl = strdup(url);
 980                         char realpath_buff[MAXPATHLEN];
 981
 982                         if (purl == NULL)
 983                                 _exit(242);
 984
 985                         inFd  = toCgi[0];
 986                         outFd = fromCgi[1];
 987
 988                         dup2(inFd, 0);  // replace stdin with the pipe
 989                         dup2(outFd, 1);  // replace stdout with the pipe
 990                         if (!DEBUG)
 991                                 dup2(outFd, 2);  // replace stderr with the pipe
 992
 993                         close(toCgi[0]);
 994                         close(toCgi[1]);
 995                         close(fromCgi[0]);
 996                         close(fromCgi[1]);
 997
 998                         close(config->accepted_socket);
 999                         close(config->server_socket);
1000
1001                         /*
1002                          * Find PATH_INFO.
1003                          */
1004                         script = purl;
1005                         while ((script = strchr(script + 1, '/')) != NULL) {
1006                                 /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */
1007                                 struct stat sb;
1008
1009                                 *script = '\0';
1010                                 if (is_directory(purl + 1, 1, &sb) == 0) {
1011                                         /* not directory, found script.cgi/PATH_INFO */
1012                                         *script = '/';
1013                                         break;
1014                                 }
1015                                 *script = '/';          /* is directory, find next '/' */
1016                         }
1017                         setenv1("PATH_INFO", script);   /* set /PATH_INFO or "" */
1018                         /* setenv1("PATH", getenv("PATH")); redundant */
1019                         setenv1("REQUEST_METHOD", request);
1020                         if (config->query) {
1021                                 char *uri = alloca(strlen(purl) + 2 + strlen(config->query));
1022                                 if (uri)
1023                                         sprintf(uri, "%s?%s", purl, config->query);
1024                                 setenv1("REQUEST_URI", uri);
1025                         } else {
1026                                 setenv1("REQUEST_URI", purl);
1027                         }
1028                         if (script != NULL)
1029                                 *script = '\0';         /* reduce /PATH_INFO */
1030                          /* SCRIPT_FILENAME required by PHP in CGI mode */
1031                         if (!realpath(purl + 1, realpath_buff))
1032                                 goto error_execing_cgi;
1033                         setenv1("SCRIPT_FILENAME", realpath_buff);
1034                         /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */
1035                         setenv1("SCRIPT_NAME", purl);
1036                         setenv1("QUERY_STRING", config->query);
1037                         setenv1("SERVER_SOFTWARE", httpdVersion);
1038                         putenv("SERVER_PROTOCOL=HTTP/1.0");
1039                         putenv("GATEWAY_INTERFACE=CGI/1.1");
1040                         setenv1("REMOTE_ADDR", config->rmt_ip_str);
1041 #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV
1042                         setenv_long("REMOTE_PORT", config->port);
1043 #endif
1044                         if (bodyLen)
1045                                 setenv_long("CONTENT_LENGTH", bodyLen);
1046                         if (cookie)
1047                                 setenv1("HTTP_COOKIE", cookie);
1048                         if (content_type)
1049                                 setenv1("CONTENT_TYPE", content_type);
1050 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1051                         if (config->remoteuser) {
1052                                 setenv1("REMOTE_USER", config->remoteuser);
1053                                 putenv("AUTH_TYPE=Basic");
1054                         }
1055 #endif
1056                         if (config->referer)
1057                                 setenv1("HTTP_REFERER", config->referer);
1058
1059                         /* set execve argp[0] without path */
1060                         argp[0] = strrchr(purl, '/') + 1;
1061                         /* but script argp[0] must have absolute path and chdiring to this */
1062                         script = strrchr(realpath_buff, '/');
1063                         if (!script)
1064                                 goto error_execing_cgi;
1065                         *script = '\0';
1066                         if (chdir(realpath_buff) == 0) {
1067                                 // now run the program.  If it fails,
1068                                 // use _exit() so no destructors
1069                                 // get called and make a mess.
1070 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1071                                 char *interpr = NULL;
1072                                 char *suffix = strrchr(purl, '.');
1073
1074                                 if (suffix) {
1075                                         Htaccess *cur;
1076                                         for (cur = config->script_i; cur; cur = cur->next) {
1077                                                 if (strcmp(cur->before_colon + 1, suffix) == 0) {
1078                                                         interpr = cur->after_colon;
1079                                                         break;
1080                                                 }
1081                                         }
1082                                 }
1083 #endif
1084                                 *script = '/';
1085 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
1086                                 if (interpr)
1087                                         execv(interpr, argp);
1088                                 else
1089 #endif
1090                                         execv(realpath_buff, argp);
1091                         }
1092  error_execing_cgi:
1093                         /* send to stdout (even if we are not from inetd) */
1094                         config->accepted_socket = 1;
1095                         sendHeaders(HTTP_NOT_FOUND);
1096                         _exit(242);
1097                 } /* end child */
1098
1099         } while (0);
1100
1101         if (pid > 0) {
1102                 /* parent process */
1103                 int status;
1104                 size_t post_readed_size = 0, post_readed_idx = 0;
1105
1106                 inFd  = fromCgi[0];
1107                 outFd = toCgi[1];
1108                 close(fromCgi[1]);
1109                 close(toCgi[0]);
1110                 signal(SIGPIPE, SIG_IGN);
1111
1112                 while (1) {
1113                         fd_set readSet;
1114                         fd_set writeSet;
1115                         char wbuf[128];
1116                         int nfound;
1117                         int count;
1118
1119                         FD_ZERO(&readSet);
1120                         FD_ZERO(&writeSet);
1121                         FD_SET(inFd, &readSet);
1122                         if (bodyLen > 0 || post_readed_size > 0) {
1123                                 FD_SET(outFd, &writeSet);
1124                                 nfound = outFd > inFd ? outFd : inFd;
1125                                 if (post_readed_size == 0) {
1126                                         FD_SET(config->accepted_socket, &readSet);
1127                                         if (nfound < config->accepted_socket)
1128                                                 nfound = config->accepted_socket;
1129                                 }
1130                                 /* Now wait on the set of sockets! */
1131                                 nfound = select(nfound + 1, &readSet, &writeSet, 0, NULL);
1132                         } else {
1133                                 if (!bodyLen) {
1134                                         close(outFd);
1135                                         bodyLen = -1;
1136                                 }
1137                                 nfound = select(inFd + 1, &readSet, 0, 0, NULL);
1138                         }
1139
1140                         if (nfound <= 0) {
1141                                 if (waitpid(pid, &status, WNOHANG) > 0) {
1142                                         close(inFd);
1143                                         if (DEBUG && WIFEXITED(status))
1144                                                 bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status));
1145                                         if (DEBUG && WIFSIGNALED(status))
1146                                                 bb_error_msg("piped has exited with signal=%d", WTERMSIG(status));
1147                                         break;
1148                                 }
1149                         } else if (post_readed_size > 0 && FD_ISSET(outFd, &writeSet)) {
1150                                 count = full_write(outFd, wbuf + post_readed_idx, post_readed_size);
1151                                 if (count > 0) {
1152                                         post_readed_size -= count;
1153                                         post_readed_idx += count;
1154                                         if (post_readed_size == 0)
1155                                                 post_readed_idx = 0;
1156                                 } else {
1157                                         post_readed_size = post_readed_idx = bodyLen = 0; /* broken pipe to CGI */
1158                                 }
1159                         } else if (bodyLen > 0 && post_readed_size == 0 && FD_ISSET(config->accepted_socket, &readSet)) {
1160                                 count = bodyLen > (int)sizeof(wbuf) ? (int)sizeof(wbuf) : bodyLen;
1161                                 count = safe_read(config->accepted_socket, wbuf, count);
1162                                 if (count > 0) {
1163                                         post_readed_size += count;
1164                                         bodyLen -= count;
1165                                 } else {
1166                                         bodyLen = 0;    /* closed */
1167                                 }
1168                         }
1169                         if (FD_ISSET(inFd, &readSet)) {
1170                                 int s = config->accepted_socket;
1171                                 char *rbuf = config->buf;
1172
1173 #ifndef PIPE_BUF
1174 # define PIPESIZE 4096          /* amount of buffering in a pipe */
1175 #else
1176 # define PIPESIZE PIPE_BUF
1177 #endif
1178 #if PIPESIZE >= MAX_MEMORY_BUFF
1179 # error "PIPESIZE >= MAX_MEMORY_BUFF"
1180 #endif
1181
1182                                 // There is something to read
1183                                 count = safe_read(inFd, rbuf, PIPESIZE);
1184                                 if (count == 0)
1185                                         break;  /* closed */
1186                                 if (count > 0) {
1187                                         if (firstLine) {
1188                                                 rbuf[count] = 0;
1189                                                 /* check to see if the user script added headers */
1190                                                 if (strncmp(rbuf, "HTTP/1.0 200 OK\r\n", 4) != 0) {
1191                                                         full_write(s, "HTTP/1.0 200 OK\r\n", 17);
1192                                                 }
1193                                                 if (strstr(rbuf, "ontent-") == 0) {
1194                                                         full_write(s, "Content-type: text/plain\r\n\r\n", 28);
1195                                                 }
1196                                                 firstLine = 0;
1197                                         }
1198                                         if (full_write(s, rbuf, count) != count)
1199                                                 break;
1200
1201                                         if (DEBUG)
1202                                                 fprintf(stderr, "cgi read %d bytes\n", count);
1203                                 }
1204                         }
1205                 }
1206         }
1207         return 0;
1208 }
1209 #endif          /* FEATURE_HTTPD_CGI */
1210
1211 /****************************************************************************
1212  *
1213  > $Function: sendFile()
1214  *
1215  * $Description: Send a file response to a HTTP request
1216  *
1217  * $Parameter:
1218  *      (const char *) url . . The URL requested.
1219  *
1220  * $Return: (int)  . . . . . . Always 0.
1221  *
1222  ****************************************************************************/
1223 static int sendFile(const char *url)
1224 {
1225         char * suffix;
1226         int  f;
1227         const char * const * table;
1228         const char * try_suffix;
1229
1230         suffix = strrchr(url, '.');
1231
1232         for (table = suffixTable; *table; table += 2)
1233                 if (suffix != NULL && (try_suffix = strstr(*table, suffix)) != 0) {
1234                         try_suffix += strlen(suffix);
1235                         if (*try_suffix == 0 || *try_suffix == '.')
1236                                 break;
1237                 }
1238         /* also, if not found, set default as "application/octet-stream";  */
1239         config->found_mime_type = table[1];
1240 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
1241         if (suffix) {
1242                 Htaccess * cur;
1243
1244                 for (cur = config->mime_a; cur; cur = cur->next) {
1245                         if (strcmp(cur->before_colon, suffix) == 0) {
1246                                 config->found_mime_type = cur->after_colon;
1247                                 break;
1248                         }
1249                 }
1250         }
1251 #endif  /* FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */
1252
1253         if (DEBUG)
1254                 fprintf(stderr, "sending file '%s' content-type: %s\n",
1255                         url, config->found_mime_type);
1256
1257         f = open(url, O_RDONLY);
1258         if (f >= 0) {
1259                 int count;
1260                 char *buf = config->buf;
1261
1262                 sendHeaders(HTTP_OK);
1263                 /* TODO: sendfile() */
1264                 while ((count = full_read(f, buf, MAX_MEMORY_BUFF)) > 0) {
1265                         if (full_write(config->accepted_socket, buf, count) != count)
1266                                 break;
1267                 }
1268                 close(f);
1269         } else {
1270                 if (DEBUG)
1271                         bb_perror_msg("cannot open '%s'", url);
1272                 sendHeaders(HTTP_NOT_FOUND);
1273         }
1274
1275         return 0;
1276 }
1277
1278 static int checkPermIP(void)
1279 {
1280         Htaccess_IP * cur;
1281
1282         /* This could stand some work */
1283         for (cur = config->ip_a_d; cur; cur = cur->next) {
1284                 if (DEBUG)
1285                         fprintf(stderr, "checkPermIP: '%s' ? ", config->rmt_ip_str);
1286                 if (DEBUG)
1287                         fprintf(stderr, "'%u.%u.%u.%u/%u.%u.%u.%u'\n",
1288                                 (unsigned char)(cur->ip >> 24),
1289                                 (unsigned char)(cur->ip >> 16),
1290                                 (unsigned char)(cur->ip >> 8),
1291                                                 cur->ip & 0xff,
1292                                 (unsigned char)(cur->mask >> 24),
1293                                 (unsigned char)(cur->mask >> 16),
1294                                 (unsigned char)(cur->mask >> 8),
1295                                                 cur->mask & 0xff);
1296                 if ((config->rmt_ip & cur->mask) == cur->ip)
1297                         return cur->allow_deny == 'A';   /* Allow/Deny */
1298         }
1299
1300         /* if unconfigured, return 1 - access from all */
1301         return !config->flg_deny_all;
1302 }
1303
1304 /****************************************************************************
1305  *
1306  > $Function: checkPerm()
1307  *
1308  * $Description: Check the permission file for access password protected.
1309  *
1310  *   If config file isn't present, everything is allowed.
1311  *   Entries are of the form you can see example from header source
1312  *
1313  * $Parameters:
1314  *      (const char *) path  . . . . The file path.
1315  *      (const char *) request . . . User information to validate.
1316  *
1317  * $Return: (int)  . . . . . . . . . 1 if request OK, 0 otherwise.
1318  *
1319  ****************************************************************************/
1320
1321 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1322 static int checkPerm(const char *path, const char *request)
1323 {
1324         Htaccess * cur;
1325         const char *p;
1326         const char *p0;
1327
1328         const char *prev = NULL;
1329
1330         /* This could stand some work */
1331         for (cur = config->auth; cur; cur = cur->next) {
1332                 size_t l;
1333
1334                 p0 = cur->before_colon;
1335                 if (prev != NULL && strcmp(prev, p0) != 0)
1336                         continue;       /* find next identical */
1337                 p = cur->after_colon;
1338                 if (DEBUG)
1339                         fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
1340
1341                 l = strlen(p0);
1342                 if (strncmp(p0, path, l) == 0
1343                  && (l == 1 || path[l] == '/' || path[l] == '\0')
1344                 ) {
1345                         char *u;
1346                         /* path match found.  Check request */
1347                         /* for check next /path:user:password */
1348                         prev = p0;
1349                         u = strchr(request, ':');
1350                         if (u == NULL) {
1351                                 /* bad request, ':' required */
1352                                 break;
1353                         }
1354
1355                         if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
1356                                 char *cipher;
1357                                 char *pp;
1358
1359                                 if (strncmp(p, request, u-request) != 0) {
1360                                         /* user uncompared */
1361                                         continue;
1362                                 }
1363                                 pp = strchr(p, ':');
1364                                 if (pp && pp[1] == '$' && pp[2] == '1' &&
1365                                                 pp[3] == '$' && pp[4]) {
1366                                         pp++;
1367                                         cipher = pw_encrypt(u+1, pp);
1368                                         if (strcmp(cipher, pp) == 0)
1369                                                 goto set_remoteuser_var;   /* Ok */
1370                                         /* unauthorized */
1371                                         continue;
1372                                 }
1373                         }
1374
1375                         if (strcmp(p, request) == 0) {
1376 set_remoteuser_var:
1377                                 config->remoteuser = strdup(request);
1378                                 if (config->remoteuser)
1379                                         config->remoteuser[(u - request)] = 0;
1380                                 return 1;   /* Ok */
1381                         }
1382                         /* unauthorized */
1383                 }
1384         }   /* for */
1385
1386         return prev == NULL;
1387 }
1388
1389 #endif  /* FEATURE_HTTPD_BASIC_AUTH */
1390
1391 /****************************************************************************
1392  *
1393  > $Function: handle_sigalrm()
1394  *
1395  * $Description: Handle timeouts
1396  *
1397  ****************************************************************************/
1398
1399 static void handle_sigalrm(int sig)
1400 {
1401         sendHeaders(HTTP_REQUEST_TIMEOUT);
1402         config->alarm_signaled = sig;
1403 }
1404
1405 /****************************************************************************
1406  *
1407  > $Function: handleIncoming()
1408  *
1409  * $Description: Handle an incoming http request.
1410  *
1411  ****************************************************************************/
1412 static void handleIncoming(void)
1413 {
1414         char *buf = config->buf;
1415         char *url;
1416         char *purl;
1417         int  blank = -1;
1418         char *test;
1419         struct stat sb;
1420         int ip_allowed;
1421 #if ENABLE_FEATURE_HTTPD_CGI
1422         const char *prequest = request_GET;
1423         unsigned long length = 0;
1424         char *cookie = 0;
1425         char *content_type = 0;
1426 #endif
1427         fd_set s_fd;
1428         struct timeval tv;
1429         int retval;
1430         struct sigaction sa;
1431
1432 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1433         int credentials = -1;  /* if not required this is Ok */
1434 #endif
1435
1436         sa.sa_handler = handle_sigalrm;
1437         sigemptyset(&sa.sa_mask);
1438         sa.sa_flags = 0; /* no SA_RESTART */
1439         sigaction(SIGALRM, &sa, NULL);
1440
1441         do {
1442                 int count;
1443
1444                 (void) alarm(TIMEOUT);
1445                 if (getLine() <= 0)
1446                         break;  /* closed */
1447
1448                 purl = strpbrk(buf, " \t");
1449                 if (purl == NULL) {
1450  BAD_REQUEST:
1451                         sendHeaders(HTTP_BAD_REQUEST);
1452                         break;
1453                 }
1454                 *purl = '\0';
1455 #if ENABLE_FEATURE_HTTPD_CGI
1456                 if (strcasecmp(buf, prequest) != 0) {
1457                         prequest = "POST";
1458                         if (strcasecmp(buf, prequest) != 0) {
1459                                 sendHeaders(HTTP_NOT_IMPLEMENTED);
1460                                 break;
1461                         }
1462                 }
1463 #else
1464                 if (strcasecmp(buf, request_GET) != 0) {
1465                         sendHeaders(HTTP_NOT_IMPLEMENTED);
1466                         break;
1467                 }
1468 #endif
1469                 *purl = ' ';
1470                 count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank);
1471
1472                 if (count < 1 || buf[0] != '/') {
1473                         /* Garbled request/URL */
1474                         goto BAD_REQUEST;
1475                 }
1476                 url = alloca(strlen(buf) + sizeof("/index.html"));
1477                 if (url == NULL) {
1478                         sendHeaders(HTTP_INTERNAL_SERVER_ERROR);
1479                         break;
1480                 }
1481                 strcpy(url, buf);
1482                 /* extract url args if present */
1483                 test = strchr(url, '?');
1484                 if (test) {
1485                         *test++ = '\0';
1486                         config->query = test;
1487                 }
1488
1489                 test = decodeString(url, 0);
1490                 if (test == NULL)
1491                         goto BAD_REQUEST;
1492                 /* FIXME: bug? should be "url+1"? */
1493                 if (test == (buf+1)) {
1494                         sendHeaders(HTTP_NOT_FOUND);
1495                         break;
1496                 }
1497
1498                 /* algorithm stolen from libbb bb_simplify_path(),
1499                          but don't strdup and reducing trailing slash and protect out root */
1500                 purl = test = url;
1501                 do {
1502                         if (*purl == '/') {
1503                                 /* skip duplicate (or initial) slash */
1504                                 if (*test == '/') {
1505                                         continue;
1506                                 }
1507                                 if (*test == '.') {
1508                                         /* skip extra '.' */
1509                                         if (test[1] == '/' || test[1] == 0) {
1510                                                 continue;
1511                                         } else
1512                                         /* '..': be careful */
1513                                         if (test[1] == '.' && (test[2] == '/' || test[2] == 0)) {
1514                                                 ++test;
1515                                                 if (purl == url) {
1516                                                         /* protect out root */
1517                                                         goto BAD_REQUEST;
1518                                                 }
1519                                                 while (*--purl != '/') /* omit previous dir */;
1520                                                 continue;
1521                                         }
1522                                 }
1523                         }
1524                         *++purl = *test;
1525                 } while (*++test);
1526                 *++purl = '\0';       /* so keep last character */
1527                 test = purl;          /* end ptr */
1528
1529                 /* If URL is directory, adding '/' */
1530                 if (test[-1] != '/') {
1531                         if (is_directory(url + 1, 1, &sb)) {
1532                                 config->found_moved_temporarily = url;
1533                         }
1534                 }
1535                 if (DEBUG)
1536                         fprintf(stderr, "url='%s', args=%s\n", url, config->query);
1537
1538                 test = url;
1539                 ip_allowed = checkPermIP();
1540                 while (ip_allowed && (test = strchr(test + 1, '/')) != NULL) {
1541                         /* have path1/path2 */
1542                         *test = '\0';
1543                         if (is_directory(url + 1, 1, &sb)) {
1544                                 /* may be having subdir config */
1545                                 parse_conf(url + 1, SUBDIR_PARSE);
1546                                 ip_allowed = checkPermIP();
1547                         }
1548                         *test = '/';
1549                 }
1550                 if (blank >= 0) {
1551                         // read until blank line for HTTP version specified, else parse immediate
1552                         while (1) {
1553                                 alarm(TIMEOUT);
1554                                 count = getLine();
1555                                 if (count <= 0)
1556                                         break;
1557
1558                                 if (DEBUG)
1559                                         fprintf(stderr, "header: '%s'\n", buf);
1560
1561 #if ENABLE_FEATURE_HTTPD_CGI
1562                                 /* try and do our best to parse more lines */
1563                                 if ((STRNCASECMP(buf, "Content-length:") == 0)) {
1564                                         /* extra read only for POST */
1565                                         if (prequest != request_GET) {
1566                                                 test = buf + sizeof("Content-length:")-1;
1567                                                 if (!test[0]) goto bail_out;
1568                                                 errno = 0;
1569                                                 /* not using strtoul: it ignores leading munis! */
1570                                                 length = strtol(test, &test, 10);
1571                                                 /* length is "ulong", but we need to pass it to int later */
1572                                                 /* so we check for negative or too large values in one go: */
1573                                                 /* (long -> ulong conv will cause negatives to be seen as > INT_MAX) */
1574                                                 if (test[0] || errno || length > INT_MAX)
1575                                                         goto bail_out;
1576                                         }
1577                                 } else if ((STRNCASECMP(buf, "Cookie:") == 0)) {
1578                                         cookie = strdup(skip_whitespace(buf + sizeof("Cookie:")-1));
1579                                 } else if ((STRNCASECMP(buf, "Content-Type:") == 0)) {
1580                                         content_type = strdup(skip_whitespace(buf + sizeof("Content-Type:")-1));
1581                                 } else if ((STRNCASECMP(buf, "Referer:") == 0)) {
1582                                         config->referer = strdup(skip_whitespace(buf + sizeof("Referer:")-1));
1583                                 }
1584 #endif
1585
1586 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1587                                 if (STRNCASECMP(buf, "Authorization:") == 0) {
1588                                         /* We only allow Basic credentials.
1589                                          * It shows up as "Authorization: Basic <userid:password>" where
1590                                          * the userid:password is base64 encoded.
1591                                          */
1592                                         test = skip_whitespace(buf + sizeof("Authorization:")-1);
1593                                         if (STRNCASECMP(test, "Basic") != 0)
1594                                                 continue;
1595                                         test += sizeof("Basic")-1;
1596                                         /* decodeBase64() skips whitespace itself */
1597                                         decodeBase64(test);
1598                                         credentials = checkPerm(url, test);
1599                                 }
1600 #endif          /* FEATURE_HTTPD_BASIC_AUTH */
1601
1602                         } /* while extra header reading */
1603                 }
1604                 (void) alarm(0);
1605                 if (config->alarm_signaled)
1606                         break;
1607
1608                 if (strcmp(strrchr(url, '/') + 1, httpd_conf) == 0 || ip_allowed == 0) {
1609                         /* protect listing [/path]/httpd_conf or IP deny */
1610 #if ENABLE_FEATURE_HTTPD_CGI
1611 FORBIDDEN:              /* protect listing /cgi-bin */
1612 #endif
1613                         sendHeaders(HTTP_FORBIDDEN);
1614                         break;
1615                 }
1616
1617 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1618                 if (credentials <= 0 && checkPerm(url, ":") == 0) {
1619                         sendHeaders(HTTP_UNAUTHORIZED);
1620                         break;
1621                 }
1622 #endif
1623
1624                 if (config->found_moved_temporarily) {
1625                         sendHeaders(HTTP_MOVED_TEMPORARILY);
1626                         /* clear unforked memory flag */
1627                         config->found_moved_temporarily = NULL;
1628                         break;
1629                 }
1630
1631                 test = url + 1;      /* skip first '/' */
1632
1633 #if ENABLE_FEATURE_HTTPD_CGI
1634                 if (strncmp(test, "cgi-bin", 7) == 0) {
1635                         if (test[7] == '/' && test[8] == 0)
1636                                 goto FORBIDDEN;     // protect listing cgi-bin/
1637                         sendCgi(url, prequest, length, cookie, content_type);
1638                 } else {
1639                         if (prequest != request_GET)
1640                                 sendHeaders(HTTP_NOT_IMPLEMENTED);
1641                         else {
1642 #endif  /* FEATURE_HTTPD_CGI */
1643                                 if (purl[-1] == '/')
1644                                         strcpy(purl, "index.html");
1645                                 if (stat(test, &sb) == 0) {
1646                                         config->ContentLength = sb.st_size;
1647                                         config->last_mod = sb.st_mtime;
1648                                 }
1649                                 sendFile(test);
1650                                 config->ContentLength = -1;
1651 #if ENABLE_FEATURE_HTTPD_CGI
1652                         }
1653                 }
1654 #endif
1655         } while (0);
1656
1657  bail_out:
1658
1659         if (DEBUG)
1660                 fprintf(stderr, "closing socket\n\n");
1661 #if ENABLE_FEATURE_HTTPD_CGI
1662         free(cookie);
1663         free(content_type);
1664         free(config->referer);
1665         config->referer = NULL;
1666 # if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1667         free(config->remoteuser);
1668         config->remoteuser = NULL;
1669 # endif
1670 #endif
1671         shutdown(config->accepted_socket, SHUT_WR);
1672
1673         /* Properly wait for remote to closed */
1674         FD_ZERO(&s_fd);
1675         FD_SET(config->accepted_socket, &s_fd);
1676
1677         do {
1678                 tv.tv_sec = 2;
1679                 tv.tv_usec = 0;
1680                 retval = select(config->accepted_socket + 1, &s_fd, NULL, NULL, &tv);
1681         } while (retval > 0 && read(config->accepted_socket, buf, sizeof(config->buf) > 0));
1682
1683         shutdown(config->accepted_socket, SHUT_RD);
1684         /* In inetd case, we close fd 1 (stdout) here. We will exit soon anyway */
1685         close(config->accepted_socket);
1686 }
1687
1688 /****************************************************************************
1689  *
1690  > $Function: miniHttpd()
1691  *
1692  * $Description: The main http server function.
1693  *
1694  *   Given an open socket fildes, listen for new connections and farm out
1695  *   the processing as a forked process.
1696  *
1697  * $Parameters:
1698  *      (int) server. . . The server socket fildes.
1699  *
1700  * $Return: (int) . . . . Always 0.
1701  *
1702  ****************************************************************************/
1703 static int miniHttpd(int server)
1704 {
1705         fd_set readfd, portfd;
1706
1707         FD_ZERO(&portfd);
1708         FD_SET(server, &portfd);
1709
1710         /* copy the ports we are watching to the readfd set */
1711         while (1) {
1712                 int on, s;
1713                 socklen_t fromAddrLen;
1714                 struct sockaddr_in fromAddr;
1715
1716                 /* Now wait INDEFINITELY on the set of sockets! */
1717                 readfd = portfd;
1718                 if (select(server + 1, &readfd, 0, 0, 0) <= 0)
1719                         continue;
1720                 if (!FD_ISSET(server, &readfd))
1721                         continue;
1722                 fromAddrLen = sizeof(fromAddr);
1723                 s = accept(server, (struct sockaddr *)&fromAddr, &fromAddrLen);
1724                 if (s < 0)
1725                         continue;
1726                 config->accepted_socket = s;
1727                 config->rmt_ip = ntohl(fromAddr.sin_addr.s_addr);
1728 #if ENABLE_FEATURE_HTTPD_CGI || DEBUG
1729                 sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
1730                                 (unsigned char)(config->rmt_ip >> 24),
1731                                 (unsigned char)(config->rmt_ip >> 16),
1732                                 (unsigned char)(config->rmt_ip >> 8),
1733                                 config->rmt_ip & 0xff);
1734                 config->port = ntohs(fromAddr.sin_port);
1735 #if DEBUG
1736                 bb_error_msg("connection from IP=%s, port %u",
1737                                 config->rmt_ip_str, config->port);
1738 #endif
1739 #endif /* FEATURE_HTTPD_CGI */
1740
1741                 /* set the KEEPALIVE option to cull dead connections */
1742                 on = 1;
1743                 setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, sizeof(on));
1744 #if !DEBUG
1745                 if (fork() == 0)
1746 #endif
1747                 {
1748                         /* This is the spawned thread */
1749 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1750                         /* protect reload config, may be confuse checking */
1751                         signal(SIGHUP, SIG_IGN);
1752 #endif
1753                         handleIncoming();
1754 #if !DEBUG
1755                         exit(0);
1756 #endif
1757                 }
1758                 close(s);
1759         } // while (1)
1760         return 0;
1761 }
1762
1763 /* from inetd */
1764 static int miniHttpd_inetd(void)
1765 {
1766         struct sockaddr_in fromAddrLen;
1767         socklen_t sinlen = sizeof(struct sockaddr_in);
1768
1769         getpeername(0, (struct sockaddr *)&fromAddrLen, &sinlen);
1770         config->rmt_ip = ntohl(fromAddrLen.sin_addr.s_addr);
1771 #if ENABLE_FEATURE_HTTPD_CGI
1772         sprintf(config->rmt_ip_str, "%u.%u.%u.%u",
1773                                 (unsigned char)(config->rmt_ip >> 24),
1774                                 (unsigned char)(config->rmt_ip >> 16),
1775                                 (unsigned char)(config->rmt_ip >> 8),
1776                                                 config->rmt_ip & 0xff);
1777 #endif
1778         config->port = ntohs(fromAddrLen.sin_port);
1779         handleIncoming();
1780         return 0;
1781 }
1782
1783 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1784 static void sighup_handler(int sig)
1785 {
1786         /* set and reset */
1787         struct sigaction sa;
1788
1789         parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE);
1790         sa.sa_handler = sighup_handler;
1791         sigemptyset(&sa.sa_mask);
1792         sa.sa_flags = SA_RESTART;
1793         sigaction(SIGHUP, &sa, NULL);
1794 }
1795 #endif
1796
1797 enum {
1798         c_opt_config_file = 0,
1799         d_opt_decode_url,
1800         h_opt_home_httpd,
1801         USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,)
1802         USE_FEATURE_HTTPD_BASIC_AUTH(    r_opt_realm     ,)
1803         USE_FEATURE_HTTPD_AUTH_MD5(      m_opt_md5       ,)
1804         USE_FEATURE_HTTPD_SETUID(        u_opt_setuid    ,)
1805         p_opt_port      ,
1806         p_opt_inetd     ,
1807         p_opt_foreground,
1808         OPT_CONFIG_FILE = 1 << c_opt_config_file,
1809         OPT_DECODE_URL  = 1 << d_opt_decode_url,
1810         OPT_HOME_HTTPD  = 1 << h_opt_home_httpd,
1811         OPT_ENCODE_URL  = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0,
1812         OPT_REALM       = USE_FEATURE_HTTPD_BASIC_AUTH(    (1 << r_opt_realm     )) + 0,
1813         OPT_MD5         = USE_FEATURE_HTTPD_AUTH_MD5(      (1 << m_opt_md5       )) + 0,
1814         OPT_SETUID      = USE_FEATURE_HTTPD_SETUID(        (1 << u_opt_setuid    )) + 0,
1815         OPT_PORT        = 1 << p_opt_port,
1816         OPT_INETD       = 1 << p_opt_inetd,
1817         OPT_FOREGROUND  = 1 << p_opt_foreground,
1818 };
1819
1820 static const char httpd_opts[] = "c:d:h:"
1821         USE_FEATURE_HTTPD_ENCODE_URL_STR("e:")
1822         USE_FEATURE_HTTPD_BASIC_AUTH("r:")
1823         USE_FEATURE_HTTPD_AUTH_MD5("m:")
1824         USE_FEATURE_HTTPD_SETUID("u:")
1825         "p:if";
1826
1827
1828 int httpd_main(int argc, char *argv[])
1829 {
1830         unsigned opt;
1831         const char *home_httpd = home;
1832         char *url_for_decode;
1833         USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;)
1834         const char *s_port;
1835         USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;)
1836         USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;)
1837         USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;)
1838
1839         config = xzalloc(sizeof(*config));
1840 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH
1841         config->realm = "Web Server Authentication";
1842 #endif
1843         config->port = 80;
1844         config->ContentLength = -1;
1845
1846         opt = getopt32(argc, argv, httpd_opts,
1847                         &(config->configFile), &url_for_decode, &home_httpd
1848                         USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode)
1849                         USE_FEATURE_HTTPD_BASIC_AUTH(, &(config->realm))
1850                         USE_FEATURE_HTTPD_AUTH_MD5(, &pass)
1851                         USE_FEATURE_HTTPD_SETUID(, &s_ugid)
1852                         , &s_port
1853                 );
1854         if (opt & OPT_DECODE_URL) {
1855                 printf("%s", decodeString(url_for_decode, 1));
1856                 return 0;
1857         }
1858 #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR
1859         if (opt & OPT_ENCODE_URL) {
1860                 printf("%s", encodeString(url_for_encode));
1861                 return 0;
1862         }
1863 #endif
1864 #if ENABLE_FEATURE_HTTPD_AUTH_MD5
1865         if (opt & OPT_MD5) {
1866                 puts(pw_encrypt(pass, "$1$"));
1867                 return 0;
1868         }
1869 #endif
1870         if (opt & OPT_PORT)
1871                 config->port = xatou16(s_port);
1872
1873 #if ENABLE_FEATURE_HTTPD_SETUID
1874         if (opt & OPT_SETUID) {
1875                 char *e;
1876                 // FIXME: what the default group should be?
1877                 ugid.gid = -1;
1878                 ugid.uid = strtoul(s_ugid, &e, 0);
1879                 if (*e == ':') {
1880                         e++;
1881                         ugid.gid = strtoul(e, &e, 0);
1882                 }
1883                 if (*e != '\0') {
1884                         /* not integer */
1885                         if (!uidgid_get(&ugid, s_ugid))
1886                                 bb_error_msg_and_die("unrecognized user[:group] "
1887                                                 "name '%s'", s_ugid);
1888                 }
1889         }
1890 #endif
1891
1892         xchdir(home_httpd);
1893         if (!(opt & OPT_INETD)) {
1894                 config->server_socket = openServer();
1895 #if ENABLE_FEATURE_HTTPD_SETUID
1896                 /* drop privileges */
1897                 if (opt & OPT_SETUID) {
1898                         if (ugid.gid != (gid_t)-1) {
1899                                 if (setgroups(1, &ugid.gid) == -1)
1900                                         bb_perror_msg_and_die("setgroups");
1901                                 xsetgid(ugid.gid);
1902                         }
1903                         xsetuid(ugid.uid);
1904                 }
1905 #endif
1906         }
1907
1908 #if ENABLE_FEATURE_HTTPD_CGI
1909         {
1910                 char *p = getenv("PATH");
1911                 if (p) {
1912                         p = xstrdup(p);
1913                 }
1914                 clearenv();
1915                 if (p)
1916                         setenv1("PATH", p);
1917                 if (!(opt & OPT_INETD))
1918                         setenv_long("SERVER_PORT", config->port);
1919         }
1920 #endif
1921
1922 #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP
1923         sighup_handler(0);
1924 #else
1925         parse_conf(default_path_httpd_conf, FIRST_PARSE);
1926 #endif
1927
1928         if (opt & OPT_INETD)
1929                 return miniHttpd_inetd();
1930
1931         if (!(opt & OPT_FOREGROUND))
1932                 xdaemon(1, 0);     /* don't change current directory */
1933         return miniHttpd(config->server_socket);
1934 }