diff options
Diffstat (limited to 'networking/httpd.c')
-rw-r--r-- | networking/httpd.c | 1970 |
1 files changed, 1970 insertions, 0 deletions
diff --git a/networking/httpd.c b/networking/httpd.c new file mode 100644 index 000000000..49c2c76be --- /dev/null +++ b/networking/httpd.c @@ -0,0 +1,1970 @@ +/* vi: set sw=4 ts=4: */ +/* + * httpd implementation for busybox + * + * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org> + * Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru> + * + * simplify patch stolen from libbb without using strdup + * + * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. + * + ***************************************************************************** + * + * Typical usage: + * for non root user + * httpd -p 8080 -h $HOME/public_html + * or for daemon start from rc script with uid=0: + * httpd -u www + * This is equivalent if www user have uid=80 to + * httpd -p 80 -u 80 -h /www -c /etc/httpd.conf -r "Web Server Authentication" + * + * + * When a url contains "cgi-bin" it is assumed to be a cgi script. The + * server changes directory to the location of the script and executes it + * after setting QUERY_STRING and other environment variables. + * + * Doc: + * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html + * + * The server can also be invoked as a url arg decoder and html text encoder + * as follows: + * foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World" + * bar=`httpd -e "<Hello World>"` # encode as "<Hello World>" + * Note that url encoding for arguments is not the same as html encoding for + * presentation. -d decodes a url-encoded argument while -e encodes in html + * for page display. + * + * httpd.conf has the following format: + * + * A:172.20. # Allow address from 172.20.0.0/16 + * A:10.0.0.0/25 # Allow any address from 10.0.0.0-10.0.0.127 + * A:10.0.0.0/255.255.255.128 # Allow any address that previous set + * A:127.0.0.1 # Allow local loopback connections + * D:* # Deny from other IP connections + * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/ + * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/ + * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/ + * .au:audio/basic # additional mime type for audio.au files + * *.php:/path/php # running cgi.php scripts through an interpreter + * + * A/D may be as a/d or allow/deny - first char case insensitive + * Deny IP rules take precedence over allow rules. + * + * + * The Deny/Allow IP logic: + * + * - Default is to allow all. No addresses are denied unless + * denied with a D: rule. + * - Order of Deny/Allow rules is significant + * - Deny rules take precedence over allow rules. + * - If a deny all rule (D:*) is used it acts as a catch-all for unmatched + * addresses. + * - Specification of Allow all (A:*) is a no-op + * + * Example: + * 1. Allow only specified addresses + * A:172.20 # Allow any address that begins with 172.20. + * A:10.10. # Allow any address that begins with 10.10. + * A:127.0.0.1 # Allow local loopback connections + * D:* # Deny from other IP connections + * + * 2. Only deny specified addresses + * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255 + * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255 + * A:* # (optional line added for clarity) + * + * If a sub directory contains a config file it is parsed and merged with + * any existing settings as if it was appended to the original configuration. + * + * subdir paths are relative to the containing subdir and thus cannot + * affect the parent rules. + * + * Note that since the sub dir is parsed in the forked thread servicing the + * subdir http request, any merge is discarded when the process exits. As a + * result, the subdir settings only have a lifetime of a single request. + * + * + * If -c is not set, an attempt will be made to open the default + * root configuration file. If -c is set and the file is not found, the + * server exits with an error. + * +*/ + + +#include "busybox.h" + + +static const char httpdVersion[] = "busybox httpd/1.35 6-Oct-2004"; +static const char default_path_httpd_conf[] = "/etc"; +static const char httpd_conf[] = "httpd.conf"; +static const char home[] = "./"; + +#define TIMEOUT 60 + +// Note: busybox xfuncs are not used because we want the server to keep running +// if something bad happens due to a malformed user request. +// As a result, all memory allocation after daemonize +// is checked rigorously + +//#define DEBUG 1 + +#ifndef DEBUG +# define DEBUG 0 +#endif + +#define MAX_MEMORY_BUFF 8192 /* IO buffer */ + +typedef struct HT_ACCESS { + char *after_colon; + struct HT_ACCESS *next; + char before_colon[1]; /* really bigger, must last */ +} Htaccess; + +typedef struct HT_ACCESS_IP { + unsigned int ip; + unsigned int mask; + int allow_deny; + struct HT_ACCESS_IP *next; +} Htaccess_IP; + +typedef struct { + char buf[MAX_MEMORY_BUFF]; + + USE_FEATURE_HTTPD_BASIC_AUTH(const char *realm;) + USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;) + + const char *query; + + USE_FEATURE_HTTPD_CGI(char *referer;) + + const char *configFile; + + unsigned int rmt_ip; +#if ENABLE_FEATURE_HTTPD_CGI || DEBUG + char rmt_ip_str[16]; /* for set env REMOTE_ADDR */ +#endif + unsigned port; /* server initial port and for + set env REMOTE_PORT */ + const char *found_mime_type; + const char *found_moved_temporarily; + + off_t ContentLength; /* -1 - unknown */ + time_t last_mod; + + Htaccess_IP *ip_a_d; /* config allow/deny lines */ + int flg_deny_all; +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + Htaccess *auth; /* config user:password lines */ +#endif +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES + Htaccess *mime_a; /* config mime types */ +#endif + + int server_socket; + int accepted_socket; + volatile int alarm_signaled; + +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + Htaccess *script_i; /* config script interpreters */ +#endif +} HttpdConfig; + +static HttpdConfig *config; + +static const char request_GET[] = "GET"; /* size algorithmic optimize */ + +static const char* const suffixTable [] = { +/* Warning: shorted equivalent suffix in one line must be first */ + ".htm.html", "text/html", + ".jpg.jpeg", "image/jpeg", + ".gif", "image/gif", + ".png", "image/png", + ".txt.h.c.cc.cpp", "text/plain", + ".css", "text/css", + ".wav", "audio/wav", + ".avi", "video/x-msvideo", + ".qt.mov", "video/quicktime", + ".mpe.mpeg", "video/mpeg", + ".mid.midi", "audio/midi", + ".mp3", "audio/mpeg", +#if 0 /* unpopular */ + ".au", "audio/basic", + ".pac", "application/x-ns-proxy-autoconfig", + ".vrml.wrl", "model/vrml", +#endif + 0, "application/octet-stream" /* default */ +}; + +typedef enum { + HTTP_OK = 200, + HTTP_MOVED_TEMPORARILY = 302, + HTTP_BAD_REQUEST = 400, /* malformed syntax */ + HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */ + HTTP_NOT_FOUND = 404, + HTTP_FORBIDDEN = 403, + HTTP_REQUEST_TIMEOUT = 408, + HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */ + HTTP_INTERNAL_SERVER_ERROR = 500, +#if 0 /* future use */ + HTTP_CONTINUE = 100, + HTTP_SWITCHING_PROTOCOLS = 101, + HTTP_CREATED = 201, + HTTP_ACCEPTED = 202, + HTTP_NON_AUTHORITATIVE_INFO = 203, + HTTP_NO_CONTENT = 204, + HTTP_MULTIPLE_CHOICES = 300, + HTTP_MOVED_PERMANENTLY = 301, + HTTP_NOT_MODIFIED = 304, + HTTP_PAYMENT_REQUIRED = 402, + HTTP_BAD_GATEWAY = 502, + HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */ + HTTP_RESPONSE_SETSIZE = 0xffffffff +#endif +} HttpResponseNum; + +typedef struct { + HttpResponseNum type; + const char *name; + const char *info; +} HttpEnumString; + +static const HttpEnumString httpResponseNames[] = { + { HTTP_OK, "OK", NULL }, + { HTTP_MOVED_TEMPORARILY, "Found", "Directories must end with a slash." }, + { HTTP_REQUEST_TIMEOUT, "Request Timeout", + "No request appeared within a reasonable time period." }, + { HTTP_NOT_IMPLEMENTED, "Not Implemented", + "The requested method is not recognized by this server." }, +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + { HTTP_UNAUTHORIZED, "Unauthorized", "" }, +#endif + { HTTP_NOT_FOUND, "Not Found", + "The requested URL was not found on this server." }, + { HTTP_BAD_REQUEST, "Bad Request", "Unsupported method." }, + { HTTP_FORBIDDEN, "Forbidden", "" }, + { HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error", + "Internal Server Error" }, +#if 0 /* not implemented */ + { HTTP_CREATED, "Created" }, + { HTTP_ACCEPTED, "Accepted" }, + { HTTP_NO_CONTENT, "No Content" }, + { HTTP_MULTIPLE_CHOICES, "Multiple Choices" }, + { HTTP_MOVED_PERMANENTLY, "Moved Permanently" }, + { HTTP_NOT_MODIFIED, "Not Modified" }, + { HTTP_BAD_GATEWAY, "Bad Gateway", "" }, + { HTTP_SERVICE_UNAVAILABLE, "Service Unavailable", "" }, +#endif +}; + + +static const char RFC1123FMT[] = "%a, %d %b %Y %H:%M:%S GMT"; + + +#define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1) + + +static int scan_ip(const char **ep, unsigned int *ip, unsigned char endc) +{ + const char *p = *ep; + int auto_mask = 8; + int j; + + *ip = 0; + for (j = 0; j < 4; j++) { + unsigned int octet; + + if ((*p < '0' || *p > '9') && (*p != '/' || j == 0) && *p != 0) + return -auto_mask; + octet = 0; + while (*p >= '0' && *p <= '9') { + octet *= 10; + octet += *p - '0'; + if (octet > 255) + return -auto_mask; + p++; + } + if (*p == '.') + p++; + if (*p != '/' && *p != 0) + auto_mask += 8; + *ip = ((*ip) << 8) | octet; + } + if (*p != 0) { + if (*p != endc) + return -auto_mask; + p++; + if (*p == 0) + return -auto_mask; + } + *ep = p; + return auto_mask; +} + +static int scan_ip_mask(const char *ipm, unsigned int *ip, unsigned int *mask) +{ + int i; + unsigned int msk; + + i = scan_ip(&ipm, ip, '/'); + if (i < 0) + return i; + if (*ipm) { + const char *p = ipm; + + i = 0; + while (*p) { + if (*p < '0' || *p > '9') { + if (*p == '.') { + i = scan_ip(&ipm, mask, 0); + return i != 32; + } + return -1; + } + i *= 10; + i += *p - '0'; + p++; + } + } + if (i > 32 || i < 0) + return -1; + msk = 0x80000000; + *mask = 0; + while (i > 0) { + *mask |= msk; + msk >>= 1; + i--; + } + return 0; +} + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES +static void free_config_lines(Htaccess **pprev) +{ + Htaccess *prev = *pprev; + + while (prev) { + Htaccess *cur = prev; + + prev = cur->next; + free(cur); + } + *pprev = NULL; +} +#endif + +/* flag */ +#define FIRST_PARSE 0 +#define SUBDIR_PARSE 1 +#define SIGNALED_PARSE 2 +#define FIND_FROM_HTTPD_ROOT 3 +/**************************************************************************** + * + > $Function: parse_conf() + * + * $Description: parse configuration file into in-memory linked list. + * + * The first non-white character is examined to determine if the config line + * is one of the following: + * .ext:mime/type # new mime type not compiled into httpd + * [adAD]:from # ip address allow/deny, * for wildcard + * /path:user:pass # username/password + * + * Any previous IP rules are discarded. + * If the flag argument is not SUBDIR_PARSE then all /path and mime rules + * are also discarded. That is, previous settings are retained if flag is + * SUBDIR_PARSE. + * + * $Parameters: + * (const char *) path . . null for ip address checks, path for password + * checks. + * (int) flag . . . . . . the source of the parse request. + * + * $Return: (None) + * + ****************************************************************************/ +static void parse_conf(const char *path, int flag) +{ + FILE *f; +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + Htaccess *prev, *cur; +#elif ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES + Htaccess *cur; +#endif + + const char *cf = config->configFile; + char buf[160]; + char *p0 = NULL; + char *c, *p; + + /* free previous ip setup if present */ + Htaccess_IP *pip = config->ip_a_d; + + while (pip) { + Htaccess_IP *cur_ipl = pip; + + pip = cur_ipl->next; + free(cur_ipl); + } + config->ip_a_d = NULL; + + config->flg_deny_all = 0; + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + /* retain previous auth and mime config only for subdir parse */ + if (flag != SUBDIR_PARSE) { +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + free_config_lines(&config->auth); +#endif +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES + free_config_lines(&config->mime_a); +#endif +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + free_config_lines(&config->script_i); +#endif + } +#endif + + if (flag == SUBDIR_PARSE || cf == NULL) { + cf = alloca(strlen(path) + sizeof(httpd_conf) + 2); + if (cf == NULL) { + if (flag == FIRST_PARSE) + bb_error_msg_and_die(bb_msg_memory_exhausted); + return; + } + sprintf((char *)cf, "%s/%s", path, httpd_conf); + } + + while ((f = fopen(cf, "r")) == NULL) { + if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) { + /* config file not found, no changes to config */ + return; + } + if (config->configFile && flag == FIRST_PARSE) /* if -c option given */ + bb_perror_msg_and_die("%s", cf); + flag = FIND_FROM_HTTPD_ROOT; + cf = httpd_conf; + } + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + prev = config->auth; +#endif + /* This could stand some work */ + while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) { + c = NULL; + for (p = p0; *p0 != 0 && *p0 != '#'; p0++) { + if (!isspace(*p0)) { + *p++ = *p0; + if (*p0 == ':' && c == NULL) + c = p; + } + } + *p = 0; + + /* test for empty or strange line */ + if (c == NULL || *c == 0) + continue; + p0 = buf; + if (*p0 == 'd') + *p0 = 'D'; + if (*c == '*') { + if (*p0 == 'D') { + /* memorize deny all */ + config->flg_deny_all++; + } + /* skip default other "word:*" config lines */ + continue; + } + + if (*p0 == 'a') + *p0 = 'A'; + else if (*p0 != 'D' && *p0 != 'A' +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + && *p0 != '/' +#endif +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES + && *p0 != '.' +#endif +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + && *p0 != '*' +#endif + ) + continue; + if (*p0 == 'A' || *p0 == 'D') { + /* storing current config IP line */ + pip = calloc(1, sizeof(Htaccess_IP)); + if (pip) { + if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) { + /* syntax IP{/mask} error detected, protect all */ + *p0 = 'D'; + pip->mask = 0; + } + pip->allow_deny = *p0; + if (*p0 == 'D') { + /* Deny:form_IP move top */ + pip->next = config->ip_a_d; + config->ip_a_d = pip; + } else { + /* add to bottom A:form_IP config line */ + Htaccess_IP *prev_IP = config->ip_a_d; + + if (prev_IP == NULL) { + config->ip_a_d = pip; + } else { + while (prev_IP->next) + prev_IP = prev_IP->next; + prev_IP->next = pip; + } + } + } + continue; + } +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + if (*p0 == '/') { + /* make full path from httpd root / curent_path / config_line_path */ + cf = flag == SUBDIR_PARSE ? path : ""; + p0 = malloc(strlen(cf) + (c - buf) + 2 + strlen(c)); + if (p0 == NULL) + continue; + c[-1] = 0; + sprintf(p0, "/%s%s", cf, buf); + + /* another call bb_simplify_path */ + cf = p = p0; + + do { + if (*p == '/') { + if (*cf == '/') { /* skip duplicate (or initial) slash */ + continue; + } else if (*cf == '.') { + if (cf[1] == '/' || cf[1] == 0) { /* remove extra '.' */ + continue; + } else if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == 0)) { + ++cf; + if (p > p0) { + while (*--p != '/') /* omit previous dir */; + } + continue; + } + } + } + *++p = *cf; + } while (*++cf); + + if ((p == p0) || (*p != '/')) { /* not a trailing slash */ + ++p; /* so keep last character */ + } + *p = 0; + sprintf(p0, "%s:%s", p0, c); + } +#endif + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + /* storing current config line */ + cur = calloc(1, sizeof(Htaccess) + strlen(p0)); + if (cur) { + cf = strcpy(cur->before_colon, p0); + c = strchr(cf, ':'); + *c++ = 0; + cur->after_colon = c; +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES + if (*cf == '.') { + /* config .mime line move top for overwrite previous */ + cur->next = config->mime_a; + config->mime_a = cur; + continue; + } +#endif +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + if (*cf == '*' && cf[1] == '.') { + /* config script interpreter line move top for overwrite previous */ + cur->next = config->script_i; + config->script_i = cur; + continue; + } +#endif +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + free(p0); + if (prev == NULL) { + /* first line */ + config->auth = prev = cur; + } else { + /* sort path, if current lenght eq or bigger then move up */ + Htaccess *prev_hti = config->auth; + size_t l = strlen(cf); + Htaccess *hti; + + for (hti = prev_hti; hti; hti = hti->next) { + if (l >= strlen(hti->before_colon)) { + /* insert before hti */ + cur->next = hti; + if (prev_hti != hti) { + prev_hti->next = cur; + } else { + /* insert as top */ + config->auth = cur; + } + break; + } + if (prev_hti != hti) + prev_hti = prev_hti->next; + } + if (!hti) { /* not inserted, add to bottom */ + prev->next = cur; + prev = cur; + } + } +#endif + } +#endif + } + fclose(f); +} + +#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR +/**************************************************************************** + * + > $Function: encodeString() + * + * $Description: Given a string, html encode special characters. + * This is used for the -e command line option to provide an easy way + * for scripts to encode result data without confusing browsers. The + * returned string pointer is memory allocated by malloc(). + * + * $Parameters: + * (const char *) string . . The first string to encode. + * + * $Return: (char *) . . . .. . . A pointer to the encoded string. + * + * $Errors: Returns a null string ("") if memory is not available. + * + ****************************************************************************/ +static char *encodeString(const char *string) +{ + /* take the simple route and encode everything */ + /* could possibly scan once to get length. */ + int len = strlen(string); + char *out = malloc(len * 6 + 1); + char *p = out; + char ch; + + if (!out) return ""; + while ((ch = *string++)) { + // very simple check for what to encode + if (isalnum(ch)) *p++ = ch; + else p += sprintf(p, "&#%d;", (unsigned char) ch); + } + *p = 0; + return out; +} +#endif /* FEATURE_HTTPD_ENCODE_URL_STR */ + +/**************************************************************************** + * + > $Function: decodeString() + * + * $Description: Given a URL encoded string, convert it to plain ascii. + * Since decoding always makes strings smaller, the decode is done in-place. + * Thus, callers should strdup() the argument if they do not want the + * argument modified. The return is the original pointer, allowing this + * function to be easily used as arguments to other functions. + * + * $Parameters: + * (char *) string . . . The first string to decode. + * (int) option_d . . 1 if called for httpd -d + * + * $Return: (char *) . . . . A pointer to the decoded string (same as input). + * + * $Errors: None + * + ****************************************************************************/ +static char *decodeString(char *orig, int option_d) +{ + /* note that decoded string is always shorter than original */ + char *string = orig; + char *ptr = string; + char c; + + while ((c = *ptr++) != '\0') { + unsigned value1, value2; + + if (option_d && c == '+') { + *string++ = ' '; + continue; + } + if (c != '%') { + *string++ = c; + continue; + } + if (sscanf(ptr, "%1X", &value1) != 1 + || sscanf(ptr+1, "%1X", &value2) != 1 + ) { + if (!option_d) + return NULL; + *string++ = '%'; + continue; + } + value1 = value1 * 16 + value2; + if (!option_d && (value1 == '/' || value1 == '\0')) { + /* caller takes it as indication of invalid + * (dangerous wrt exploits) chars */ + return orig + 1; + } + *string++ = value1; + ptr += 2; + } + *string = '\0'; + return orig; +} + + +#if ENABLE_FEATURE_HTTPD_CGI +/**************************************************************************** + * setenv helpers + ****************************************************************************/ +static void setenv1(const char *name, const char *value) +{ + if (!value) + value = ""; + setenv(name, value, 1); +} +static void setenv_long(const char *name, long value) +{ + char buf[sizeof(value)*3 + 1]; + sprintf(buf, "%ld", value); + setenv(name, buf, 1); +} +#endif + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH +/**************************************************************************** + * + > $Function: decodeBase64() + * + > $Description: Decode a base 64 data stream as per rfc1521. + * Note that the rfc states that none base64 chars are to be ignored. + * Since the decode always results in a shorter size than the input, it is + * OK to pass the input arg as an output arg. + * + * $Parameter: + * (char *) Data . . . . A pointer to a base64 encoded string. + * Where to place the decoded data. + * + * $Return: void + * + * $Errors: None + * + ****************************************************************************/ +static void decodeBase64(char *Data) +{ + + const unsigned char *in = (const unsigned char *)Data; + // The decoded size will be at most 3/4 the size of the encoded + unsigned long ch = 0; + int i = 0; + + while (*in) { + int t = *in++; + + if (t >= '0' && t <= '9') + t = t - '0' + 52; + else if (t >= 'A' && t <= 'Z') + t = t - 'A'; + else if (t >= 'a' && t <= 'z') + t = t - 'a' + 26; + else if (t == '+') + t = 62; + else if (t == '/') + t = 63; + else if (t == '=') + t = 0; + else + continue; + + ch = (ch << 6) | t; + i++; + if (i == 4) { + *Data++ = (char) (ch >> 16); + *Data++ = (char) (ch >> 8); + *Data++ = (char) ch; + i = 0; + } + } + *Data = 0; +} +#endif + + +/**************************************************************************** + * + > $Function: openServer() + * + * $Description: create a listen server socket on the designated port. + * + * $Return: (int) . . . A connection socket. -1 for errors. + * + * $Errors: None + * + ****************************************************************************/ +static int openServer(void) +{ + struct sockaddr_in lsocket; + int fd; + + /* create the socket right now */ + /* inet_addr() returns a value that is already in network order */ + memset(&lsocket, 0, sizeof(lsocket)); + lsocket.sin_family = AF_INET; + lsocket.sin_addr.s_addr = INADDR_ANY; + lsocket.sin_port = htons(config->port); + fd = xsocket(AF_INET, SOCK_STREAM, 0); + /* tell the OS it's OK to reuse a previous address even though */ + /* it may still be in a close down state. Allows bind to succeed. */ +#ifdef SO_REUSEPORT + { + static const int on = 1; + setsockopt(fd, SOL_SOCKET, SO_REUSEPORT, + (void *)&on, sizeof(on)); + } +#else + setsockopt_reuseaddr(fd); +#endif + xbind(fd, (struct sockaddr *)&lsocket, sizeof(lsocket)); + xlisten(fd, 9); + signal(SIGCHLD, SIG_IGN); /* prevent zombie (defunct) processes */ + return fd; +} + +/**************************************************************************** + * + > $Function: sendHeaders() + * + * $Description: Create and send HTTP response headers. + * The arguments are combined and sent as one write operation. Note that + * IE will puke big-time if the headers are not sent in one packet and the + * second packet is delayed for any reason. + * + * $Parameter: + * (HttpResponseNum) responseNum . . . The result code to send. + * + * $Return: (int) . . . . writing errors + * + ****************************************************************************/ +static int sendHeaders(HttpResponseNum responseNum) +{ + char *buf = config->buf; + const char *responseString = ""; + const char *infoString = 0; + const char *mime_type; + unsigned int i; + time_t timer = time(0); + char timeStr[80]; + int len; + enum { + numNames = sizeof(httpResponseNames) / sizeof(httpResponseNames[0]) + }; + + for (i = 0; i < numNames; i++) { + if (httpResponseNames[i].type == responseNum) { + responseString = httpResponseNames[i].name; + infoString = httpResponseNames[i].info; + break; + } + } + /* error message is HTML */ + mime_type = responseNum == HTTP_OK ? + config->found_mime_type : "text/html"; + + /* emit the current date */ + strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&timer)); + len = sprintf(buf, + "HTTP/1.0 %d %s\r\nContent-type: %s\r\n" + "Date: %s\r\nConnection: close\r\n", + responseNum, responseString, mime_type, timeStr); + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + if (responseNum == HTTP_UNAUTHORIZED) { + len += sprintf(buf+len, "WWW-Authenticate: Basic realm=\"%s\"\r\n", + config->realm); + } +#endif + if (responseNum == HTTP_MOVED_TEMPORARILY) { + len += sprintf(buf+len, "Location: %s/%s%s\r\n", + config->found_moved_temporarily, + (config->query ? "?" : ""), + (config->query ? config->query : "")); + } + + if (config->ContentLength != -1) { /* file */ + strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&config->last_mod)); + len += sprintf(buf+len, "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n", + timeStr, "Content-length:", config->ContentLength); + } + strcat(buf, "\r\n"); + len += 2; + if (infoString) { + len += sprintf(buf+len, + "<HEAD><TITLE>%d %s</TITLE></HEAD>\n" + "<BODY><H1>%d %s</H1>\n%s\n</BODY>\n", + responseNum, responseString, + responseNum, responseString, infoString); + } + if (DEBUG) + fprintf(stderr, "headers: '%s'\n", buf); + return full_write(config->accepted_socket, buf, len); +} + +/**************************************************************************** + * + > $Function: getLine() + * + * $Description: Read from the socket until an end of line char found. + * + * Characters are read one at a time until an eol sequence is found. + * + * $Return: (int) . . . . number of characters read. -1 if error. + * + ****************************************************************************/ +static int getLine(void) +{ + int count = 0; + char *buf = config->buf; + + while (read(config->accepted_socket, buf + count, 1) == 1) { + if (buf[count] == '\r') continue; + if (buf[count] == '\n') { + buf[count] = 0; + return count; + } + if (count < (MAX_MEMORY_BUFF-1)) /* check overflow */ + count++; + } + if (count) return count; + else return -1; +} + +#if ENABLE_FEATURE_HTTPD_CGI +/**************************************************************************** + * + > $Function: sendCgi() + * + * $Description: Execute a CGI script and send it's stdout back + * + * Environment variables are set up and the script is invoked with pipes + * for stdin/stdout. If a post is being done the script is fed the POST + * data in addition to setting the QUERY_STRING variable (for GETs or POSTs). + * + * $Parameters: + * (const char *) url . . . . . . The requested URL (with leading /). + * (int bodyLen) . . . . . . . . Length of the post body. + * (const char *cookie) . . . . . For set HTTP_COOKIE. + * (const char *content_type) . . For set CONTENT_TYPE. + + * + * $Return: (char *) . . . . A pointer to the decoded string (same as input). + * + * $Errors: None + * + ****************************************************************************/ +static int sendCgi(const char *url, + const char *request, int bodyLen, const char *cookie, + const char *content_type) +{ + int fromCgi[2]; /* pipe for reading data from CGI */ + int toCgi[2]; /* pipe for sending data to CGI */ + + static char * argp[] = { 0, 0 }; + int pid = 0; + int inFd; + int outFd; + int firstLine = 1; + int status; + size_t post_readed_size, post_readed_idx; + + if (pipe(fromCgi) != 0) + return 0; + if (pipe(toCgi) != 0) + return 0; + + pid = fork(); + if (pid < 0) + return 0; + + if (!pid) { + /* child process */ + char *script; + char *purl = strdup(url); + char realpath_buff[MAXPATHLEN]; + + if (purl == NULL) + _exit(242); + + inFd = toCgi[0]; + outFd = fromCgi[1]; + + dup2(inFd, 0); // replace stdin with the pipe + dup2(outFd, 1); // replace stdout with the pipe + if (!DEBUG) + dup2(outFd, 2); // replace stderr with the pipe + + close(toCgi[0]); + close(toCgi[1]); + close(fromCgi[0]); + close(fromCgi[1]); + + close(config->accepted_socket); + close(config->server_socket); + + /* + * Find PATH_INFO. + */ + script = purl; + while ((script = strchr(script + 1, '/')) != NULL) { + /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */ + struct stat sb; + + *script = '\0'; + if (is_directory(purl + 1, 1, &sb) == 0) { + /* not directory, found script.cgi/PATH_INFO */ + *script = '/'; + break; + } + *script = '/'; /* is directory, find next '/' */ + } + setenv1("PATH_INFO", script); /* set /PATH_INFO or "" */ + /* setenv1("PATH", getenv("PATH")); redundant */ + setenv1("REQUEST_METHOD", request); + if (config->query) { + char *uri = alloca(strlen(purl) + 2 + strlen(config->query)); + if (uri) + sprintf(uri, "%s?%s", purl, config->query); + setenv1("REQUEST_URI", uri); + } else { + setenv1("REQUEST_URI", purl); + } + if (script != NULL) + *script = '\0'; /* cut off /PATH_INFO */ + /* SCRIPT_FILENAME required by PHP in CGI mode */ + if (!realpath(purl + 1, realpath_buff)) + goto error_execing_cgi; + setenv1("SCRIPT_FILENAME", realpath_buff); + /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */ + setenv1("SCRIPT_NAME", purl); + /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html: + * QUERY_STRING: The information which follows the ? in the URL + * which referenced this script. This is the query information. + * It should not be decoded in any fashion. This variable + * should always be set when there is query information, + * regardless of command line decoding. */ + /* (Older versions of bbox seemed to do some decoding) */ + setenv1("QUERY_STRING", config->query); + setenv1("SERVER_SOFTWARE", httpdVersion); + putenv("SERVER_PROTOCOL=HTTP/1.0"); + putenv("GATEWAY_INTERFACE=CGI/1.1"); + setenv1("REMOTE_ADDR", config->rmt_ip_str); +#if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV + setenv_long("REMOTE_PORT", config->port); +#endif + if (bodyLen) + setenv_long("CONTENT_LENGTH", bodyLen); + if (cookie) + setenv1("HTTP_COOKIE", cookie); + if (content_type) + setenv1("CONTENT_TYPE", content_type); +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + if (config->remoteuser) { + setenv1("REMOTE_USER", config->remoteuser); + putenv("AUTH_TYPE=Basic"); + } +#endif + if (config->referer) + setenv1("HTTP_REFERER", config->referer); + + /* set execve argp[0] without path */ + argp[0] = strrchr(purl, '/') + 1; + /* but script argp[0] must have absolute path and chdiring to this */ + script = strrchr(realpath_buff, '/'); + if (!script) + goto error_execing_cgi; + *script = '\0'; + if (chdir(realpath_buff) == 0) { + // now run the program. If it fails, + // use _exit() so no destructors + // get called and make a mess. +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + char *interpr = NULL; + char *suffix = strrchr(purl, '.'); + + if (suffix) { + Htaccess *cur; + for (cur = config->script_i; cur; cur = cur->next) { + if (strcmp(cur->before_colon + 1, suffix) == 0) { + interpr = cur->after_colon; + break; + } + } + } +#endif + *script = '/'; +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR + if (interpr) + execv(interpr, argp); + else +#endif + execv(realpath_buff, argp); + } + error_execing_cgi: + /* send to stdout (even if we are not from inetd) */ + config->accepted_socket = 1; + sendHeaders(HTTP_NOT_FOUND); + _exit(242); + } /* end child */ + + /* parent process */ + + post_readed_size = 0; + post_readed_idx = 0; + inFd = fromCgi[0]; + outFd = toCgi[1]; + close(fromCgi[1]); + close(toCgi[0]); + signal(SIGPIPE, SIG_IGN); + + while (1) { + fd_set readSet; + fd_set writeSet; + char wbuf[128]; + int nfound; + int count; + + FD_ZERO(&readSet); + FD_ZERO(&writeSet); + FD_SET(inFd, &readSet); + if (bodyLen > 0 || post_readed_size > 0) { + FD_SET(outFd, &writeSet); + nfound = outFd > inFd ? outFd : inFd; + if (post_readed_size == 0) { + FD_SET(config->accepted_socket, &readSet); + if (nfound < config->accepted_socket) + nfound = config->accepted_socket; + } + /* Now wait on the set of sockets! */ + nfound = select(nfound + 1, &readSet, &writeSet, 0, NULL); + } else { + if (!bodyLen) { + close(outFd); + bodyLen = -1; + } + nfound = select(inFd + 1, &readSet, 0, 0, NULL); + } + + if (nfound <= 0) { + if (waitpid(pid, &status, WNOHANG) > 0) { + close(inFd); + if (DEBUG && WIFEXITED(status)) + bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status)); + if (DEBUG && WIFSIGNALED(status)) + bb_error_msg("piped has exited with signal=%d", WTERMSIG(status)); + break; + } + } else if (post_readed_size > 0 && FD_ISSET(outFd, &writeSet)) { + count = full_write(outFd, wbuf + post_readed_idx, post_readed_size); + if (count > 0) { + post_readed_size -= count; + post_readed_idx += count; + if (post_readed_size == 0) + post_readed_idx = 0; + } else { + post_readed_size = post_readed_idx = bodyLen = 0; /* broken pipe to CGI */ + } + } else if (bodyLen > 0 && post_readed_size == 0 && FD_ISSET(config->accepted_socket, &readSet)) { + count = bodyLen > (int)sizeof(wbuf) ? (int)sizeof(wbuf) : bodyLen; + count = safe_read(config->accepted_socket, wbuf, count); + if (count > 0) { + post_readed_size += count; + bodyLen -= count; + } else { + bodyLen = 0; /* closed */ + } + } + if (FD_ISSET(inFd, &readSet)) { + int s = config->accepted_socket; + char *rbuf = config->buf; + +#ifndef PIPE_BUF +# define PIPESIZE 4096 /* amount of buffering in a pipe */ +#else +# define PIPESIZE PIPE_BUF +#endif +#if PIPESIZE >= MAX_MEMORY_BUFF +# error "PIPESIZE >= MAX_MEMORY_BUFF" +#endif + + /* There is something to read */ + count = safe_read(inFd, rbuf, PIPESIZE); + if (count == 0) + break; /* closed */ + if (count > 0) { + if (firstLine) { + rbuf[count] = 0; + /* check to see if the user script added headers */ + if (strncmp(rbuf, "HTTP/1.0 200 OK\r\n", 4) != 0) { + full_write(s, "HTTP/1.0 200 OK\r\n", 17); + } + /* Sometimes CGI is writing to pipe in small chunks + * and we don't see Content-type (because the read + * is too short) and we emit bogus "text/plain"! + * Is it a bug or CGI *has to* write it in one piece? */ + if (strstr(rbuf, "ontent-") == 0) { + full_write(s, "Content-type: text/plain\r\n\r\n", 28); + } + firstLine = 0; + } + if (full_write(s, rbuf, count) != count) + break; + + if (DEBUG) + fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf); + } + } + } + return 0; +} +#endif /* FEATURE_HTTPD_CGI */ + +/**************************************************************************** + * + > $Function: sendFile() + * + * $Description: Send a file response to a HTTP request + * + * $Parameter: + * (const char *) url . . The URL requested. + * + * $Return: (int) . . . . . . Always 0. + * + ****************************************************************************/ +static int sendFile(const char *url) +{ + char * suffix; + int f; + const char * const * table; + const char * try_suffix; + + suffix = strrchr(url, '.'); + + for (table = suffixTable; *table; table += 2) + if (suffix != NULL && (try_suffix = strstr(*table, suffix)) != 0) { + try_suffix += strlen(suffix); + if (*try_suffix == 0 || *try_suffix == '.') + break; + } + /* also, if not found, set default as "application/octet-stream"; */ + config->found_mime_type = table[1]; +#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES + if (suffix) { + Htaccess * cur; + + for (cur = config->mime_a; cur; cur = cur->next) { + if (strcmp(cur->before_colon, suffix) == 0) { + config->found_mime_type = cur->after_colon; + break; + } + } + } +#endif /* FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */ + + if (DEBUG) + fprintf(stderr, "sending file '%s' content-type: %s\n", + url, config->found_mime_type); + + f = open(url, O_RDONLY); + if (f >= 0) { + int count; + char *buf = config->buf; + + sendHeaders(HTTP_OK); + /* TODO: sendfile() */ + while ((count = full_read(f, buf, MAX_MEMORY_BUFF)) > 0) { + if (full_write(config->accepted_socket, buf, count) != count) + break; + } + close(f); + } else { + if (DEBUG) + bb_perror_msg("cannot open '%s'", url); + sendHeaders(HTTP_NOT_FOUND); + } + + return 0; +} + +static int checkPermIP(void) +{ + Htaccess_IP * cur; + + /* This could stand some work */ + for (cur = config->ip_a_d; cur; cur = cur->next) { + if (DEBUG) + fprintf(stderr, "checkPermIP: '%s' ? ", config->rmt_ip_str); + if (DEBUG) + fprintf(stderr, "'%u.%u.%u.%u/%u.%u.%u.%u'\n", + (unsigned char)(cur->ip >> 24), + (unsigned char)(cur->ip >> 16), + (unsigned char)(cur->ip >> 8), + cur->ip & 0xff, + (unsigned char)(cur->mask >> 24), + (unsigned char)(cur->mask >> 16), + (unsigned char)(cur->mask >> 8), + cur->mask & 0xff); + if ((config->rmt_ip & cur->mask) == cur->ip) + return cur->allow_deny == 'A'; /* Allow/Deny */ + } + + /* if unconfigured, return 1 - access from all */ + return !config->flg_deny_all; +} + +/**************************************************************************** + * + > $Function: checkPerm() + * + * $Description: Check the permission file for access password protected. + * + * If config file isn't present, everything is allowed. + * Entries are of the form you can see example from header source + * + * $Parameters: + * (const char *) path . . . . The file path. + * (const char *) request . . . User information to validate. + * + * $Return: (int) . . . . . . . . . 1 if request OK, 0 otherwise. + * + ****************************************************************************/ + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH +static int checkPerm(const char *path, const char *request) +{ + Htaccess * cur; + const char *p; + const char *p0; + + const char *prev = NULL; + + /* This could stand some work */ + for (cur = config->auth; cur; cur = cur->next) { + size_t l; + + p0 = cur->before_colon; + if (prev != NULL && strcmp(prev, p0) != 0) + continue; /* find next identical */ + p = cur->after_colon; + if (DEBUG) + fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request); + + l = strlen(p0); + if (strncmp(p0, path, l) == 0 + && (l == 1 || path[l] == '/' || path[l] == '\0') + ) { + char *u; + /* path match found. Check request */ + /* for check next /path:user:password */ + prev = p0; + u = strchr(request, ':'); + if (u == NULL) { + /* bad request, ':' required */ + break; + } + + if (ENABLE_FEATURE_HTTPD_AUTH_MD5) { + char *cipher; + char *pp; + + if (strncmp(p, request, u-request) != 0) { + /* user uncompared */ + continue; + } + pp = strchr(p, ':'); + if (pp && pp[1] == '$' && pp[2] == '1' && + pp[3] == '$' && pp[4]) { + pp++; + cipher = pw_encrypt(u+1, pp); + if (strcmp(cipher, pp) == 0) + goto set_remoteuser_var; /* Ok */ + /* unauthorized */ + continue; + } + } + + if (strcmp(p, request) == 0) { +set_remoteuser_var: + config->remoteuser = strdup(request); + if (config->remoteuser) + config->remoteuser[(u - request)] = 0; + return 1; /* Ok */ + } + /* unauthorized */ + } + } /* for */ + + return prev == NULL; +} + +#endif /* FEATURE_HTTPD_BASIC_AUTH */ + +/**************************************************************************** + * + > $Function: handle_sigalrm() + * + * $Description: Handle timeouts + * + ****************************************************************************/ + +static void handle_sigalrm(int sig) +{ + sendHeaders(HTTP_REQUEST_TIMEOUT); + config->alarm_signaled = sig; +} + +/**************************************************************************** + * + > $Function: handleIncoming() + * + * $Description: Handle an incoming http request. + * + ****************************************************************************/ +static void handleIncoming(void) +{ + char *buf = config->buf; + char *url; + char *purl; + int blank = -1; + char *test; + struct stat sb; + int ip_allowed; +#if ENABLE_FEATURE_HTTPD_CGI + const char *prequest = request_GET; + unsigned long length = 0; + char *cookie = 0; + char *content_type = 0; +#endif + fd_set s_fd; + struct timeval tv; + int retval; + struct sigaction sa; + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + int credentials = -1; /* if not required this is Ok */ +#endif + + sa.sa_handler = handle_sigalrm; + sigemptyset(&sa.sa_mask); + sa.sa_flags = 0; /* no SA_RESTART */ + sigaction(SIGALRM, &sa, NULL); + + do { + int count; + + (void) alarm(TIMEOUT); + if (getLine() <= 0) + break; /* closed */ + + purl = strpbrk(buf, " \t"); + if (purl == NULL) { + BAD_REQUEST: + sendHeaders(HTTP_BAD_REQUEST); + break; + } + *purl = '\0'; +#if ENABLE_FEATURE_HTTPD_CGI + if (strcasecmp(buf, prequest) != 0) { + prequest = "POST"; + if (strcasecmp(buf, prequest) != 0) { + sendHeaders(HTTP_NOT_IMPLEMENTED); + break; + } + } +#else + if (strcasecmp(buf, request_GET) != 0) { + sendHeaders(HTTP_NOT_IMPLEMENTED); + break; + } +#endif + *purl = ' '; + count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank); + + if (count < 1 || buf[0] != '/') { + /* Garbled request/URL */ + goto BAD_REQUEST; + } + url = alloca(strlen(buf) + sizeof("/index.html")); + if (url == NULL) { + sendHeaders(HTTP_INTERNAL_SERVER_ERROR); + break; + } + strcpy(url, buf); + /* extract url args if present */ + test = strchr(url, '?'); + config->query = NULL; + if (test) { + *test++ = '\0'; + config->query = test; + } + + test = decodeString(url, 0); + if (test == NULL) + goto BAD_REQUEST; + if (test == url+1) { + /* '/' or NUL is encoded */ + sendHeaders(HTTP_NOT_FOUND); + break; + } + + /* algorithm stolen from libbb bb_simplify_path(), + but don't strdup and reducing trailing slash and protect out root */ + purl = test = url; + do { + if (*purl == '/') { + /* skip duplicate (or initial) slash */ + if (*test == '/') { + continue; + } + if (*test == '.') { + /* skip extra '.' */ + if (test[1] == '/' || test[1] == 0) { + continue; + } else + /* '..': be careful */ + if (test[1] == '.' && (test[2] == '/' || test[2] == 0)) { + ++test; + if (purl == url) { + /* protect out root */ + goto BAD_REQUEST; + } + while (*--purl != '/') /* omit previous dir */; + continue; + } + } + } + *++purl = *test; + } while (*++test); + *++purl = '\0'; /* so keep last character */ + test = purl; /* end ptr */ + + /* If URL is directory, adding '/' */ + if (test[-1] != '/') { + if (is_directory(url + 1, 1, &sb)) { + config->found_moved_temporarily = url; + } + } + if (DEBUG) + fprintf(stderr, "url='%s', args=%s\n", url, config->query); + + test = url; + ip_allowed = checkPermIP(); + while (ip_allowed && (test = strchr(test + 1, '/')) != NULL) { + /* have path1/path2 */ + *test = '\0'; + if (is_directory(url + 1, 1, &sb)) { + /* may be having subdir config */ + parse_conf(url + 1, SUBDIR_PARSE); + ip_allowed = checkPermIP(); + } + *test = '/'; + } + if (blank >= 0) { + /* read until blank line for HTTP version specified, else parse immediate */ + while (1) { + alarm(TIMEOUT); + count = getLine(); + if (count <= 0) + break; + + if (DEBUG) + fprintf(stderr, "header: '%s'\n", buf); + +#if ENABLE_FEATURE_HTTPD_CGI + /* try and do our best to parse more lines */ + if ((STRNCASECMP(buf, "Content-length:") == 0)) { + /* extra read only for POST */ + if (prequest != request_GET) { + test = buf + sizeof("Content-length:")-1; + if (!test[0]) goto bail_out; + errno = 0; + /* not using strtoul: it ignores leading munis! */ + length = strtol(test, &test, 10); + /* length is "ulong", but we need to pass it to int later */ + /* so we check for negative or too large values in one go: */ + /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */ + if (test[0] || errno || length > INT_MAX) + goto bail_out; + } + } else if ((STRNCASECMP(buf, "Cookie:") == 0)) { + cookie = strdup(skip_whitespace(buf + sizeof("Cookie:")-1)); + } else if ((STRNCASECMP(buf, "Content-Type:") == 0)) { + content_type = strdup(skip_whitespace(buf + sizeof("Content-Type:")-1)); + } else if ((STRNCASECMP(buf, "Referer:") == 0)) { + config->referer = strdup(skip_whitespace(buf + sizeof("Referer:")-1)); + } +#endif + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + if (STRNCASECMP(buf, "Authorization:") == 0) { + /* We only allow Basic credentials. + * It shows up as "Authorization: Basic <userid:password>" where + * the userid:password is base64 encoded. + */ + test = skip_whitespace(buf + sizeof("Authorization:")-1); + if (STRNCASECMP(test, "Basic") != 0) + continue; + test += sizeof("Basic")-1; + /* decodeBase64() skips whitespace itself */ + decodeBase64(test); + credentials = checkPerm(url, test); + } +#endif /* FEATURE_HTTPD_BASIC_AUTH */ + + } /* while extra header reading */ + } + alarm(0); + if (config->alarm_signaled) + break; + + if (strcmp(strrchr(url, '/') + 1, httpd_conf) == 0 || ip_allowed == 0) { + /* protect listing [/path]/httpd_conf or IP deny */ +#if ENABLE_FEATURE_HTTPD_CGI + FORBIDDEN: /* protect listing /cgi-bin */ +#endif + sendHeaders(HTTP_FORBIDDEN); + break; + } + +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + if (credentials <= 0 && checkPerm(url, ":") == 0) { + sendHeaders(HTTP_UNAUTHORIZED); + break; + } +#endif + + if (config->found_moved_temporarily) { + sendHeaders(HTTP_MOVED_TEMPORARILY); + /* clear unforked memory flag */ + config->found_moved_temporarily = NULL; + break; + } + + test = url + 1; /* skip first '/' */ + +#if ENABLE_FEATURE_HTTPD_CGI + if (strncmp(test, "cgi-bin", 7) == 0) { + if (test[7] == '/' && test[8] == 0) + goto FORBIDDEN; /* protect listing cgi-bin/ */ + sendCgi(url, prequest, length, cookie, content_type); + break; + } + if (prequest != request_GET) { + sendHeaders(HTTP_NOT_IMPLEMENTED); + break; + } +#endif /* FEATURE_HTTPD_CGI */ + if (purl[-1] == '/') + strcpy(purl, "index.html"); + if (stat(test, &sb) == 0) { + /* It's a dir URL and there is index.html */ + config->ContentLength = sb.st_size; + config->last_mod = sb.st_mtime; + } +#if ENABLE_FEATURE_HTTPD_CGI + else if (purl[-1] == '/') { + /* It's a dir URL and there is no index.html + * Try cgi-bin/index.cgi */ + if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) { + purl[0] = '\0'; + config->query = url; + sendCgi("/cgi-bin/index.cgi", prequest, length, cookie, content_type); + break; + } + } +#endif /* FEATURE_HTTPD_CGI */ + sendFile(test); + config->ContentLength = -1; + } while (0); + + bail_out: + + if (DEBUG) + fprintf(stderr, "closing socket\n\n"); +#if ENABLE_FEATURE_HTTPD_CGI + free(cookie); + free(content_type); + free(config->referer); + config->referer = NULL; +# if ENABLE_FEATURE_HTTPD_BASIC_AUTH + free(config->remoteuser); + config->remoteuser = NULL; +# endif +#endif + shutdown(config->accepted_socket, SHUT_WR); + + /* Properly wait for remote to closed */ + FD_ZERO(&s_fd); + FD_SET(config->accepted_socket, &s_fd); + + do { + tv.tv_sec = 2; + tv.tv_usec = 0; + retval = select(config->accepted_socket + 1, &s_fd, NULL, NULL, &tv); + } while (retval > 0 && read(config->accepted_socket, buf, sizeof(config->buf) > 0)); + + shutdown(config->accepted_socket, SHUT_RD); + /* In inetd case, we close fd 1 (stdout) here. We will exit soon anyway */ + close(config->accepted_socket); +} + +/**************************************************************************** + * + > $Function: miniHttpd() + * + * $Description: The main http server function. + * + * Given an open socket fildes, listen for new connections and farm out + * the processing as a forked process. + * + * $Parameters: + * (int) server. . . The server socket fildes. + * + * $Return: (int) . . . . Always 0. + * + ****************************************************************************/ +static int miniHttpd(int server) +{ + fd_set readfd, portfd; + + FD_ZERO(&portfd); + FD_SET(server, &portfd); + + /* copy the ports we are watching to the readfd set */ + while (1) { + int on, s; + socklen_t fromAddrLen; + struct sockaddr_in fromAddr; + + /* Now wait INDEFINITELY on the set of sockets! */ + readfd = portfd; + if (select(server + 1, &readfd, 0, 0, 0) <= 0) + continue; + if (!FD_ISSET(server, &readfd)) + continue; + fromAddrLen = sizeof(fromAddr); + s = accept(server, (struct sockaddr *)&fromAddr, &fromAddrLen); + if (s < 0) + continue; + config->accepted_socket = s; + config->rmt_ip = ntohl(fromAddr.sin_addr.s_addr); +#if ENABLE_FEATURE_HTTPD_CGI || DEBUG + sprintf(config->rmt_ip_str, "%u.%u.%u.%u", + (unsigned char)(config->rmt_ip >> 24), + (unsigned char)(config->rmt_ip >> 16), + (unsigned char)(config->rmt_ip >> 8), + config->rmt_ip & 0xff); + config->port = ntohs(fromAddr.sin_port); +#if DEBUG + bb_error_msg("connection from IP=%s, port %u", + config->rmt_ip_str, config->port); +#endif +#endif /* FEATURE_HTTPD_CGI */ + + /* set the KEEPALIVE option to cull dead connections */ + on = 1; + setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, sizeof(on)); + + if (DEBUG || fork() == 0) { + /* child */ +#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP + /* protect reload config, may be confuse checking */ + signal(SIGHUP, SIG_IGN); +#endif + handleIncoming(); + if (!DEBUG) + exit(0); + } + close(s); + } /* while (1) */ + return 0; +} + +/* from inetd */ +static int miniHttpd_inetd(void) +{ + struct sockaddr_in fromAddrLen; + socklen_t sinlen = sizeof(struct sockaddr_in); + + getpeername(0, (struct sockaddr *)&fromAddrLen, &sinlen); + config->rmt_ip = ntohl(fromAddrLen.sin_addr.s_addr); +#if ENABLE_FEATURE_HTTPD_CGI + sprintf(config->rmt_ip_str, "%u.%u.%u.%u", + (unsigned char)(config->rmt_ip >> 24), + (unsigned char)(config->rmt_ip >> 16), + (unsigned char)(config->rmt_ip >> 8), + config->rmt_ip & 0xff); +#endif + config->port = ntohs(fromAddrLen.sin_port); + handleIncoming(); + return 0; +} + +#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP +static void sighup_handler(int sig) +{ + /* set and reset */ + struct sigaction sa; + + parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE); + sa.sa_handler = sighup_handler; + sigemptyset(&sa.sa_mask); + sa.sa_flags = SA_RESTART; + sigaction(SIGHUP, &sa, NULL); +} +#endif + +enum { + c_opt_config_file = 0, + d_opt_decode_url, + h_opt_home_httpd, + USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,) + USE_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,) + USE_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,) + USE_FEATURE_HTTPD_SETUID( u_opt_setuid ,) + p_opt_port , + p_opt_inetd , + p_opt_foreground, + OPT_CONFIG_FILE = 1 << c_opt_config_file, + OPT_DECODE_URL = 1 << d_opt_decode_url, + OPT_HOME_HTTPD = 1 << h_opt_home_httpd, + OPT_ENCODE_URL = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0, + OPT_REALM = USE_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0, + OPT_MD5 = USE_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0, + OPT_SETUID = USE_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0, + OPT_PORT = 1 << p_opt_port, + OPT_INETD = 1 << p_opt_inetd, + OPT_FOREGROUND = 1 << p_opt_foreground, +}; + +static const char httpd_opts[] = "c:d:h:" + USE_FEATURE_HTTPD_ENCODE_URL_STR("e:") + USE_FEATURE_HTTPD_BASIC_AUTH("r:") + USE_FEATURE_HTTPD_AUTH_MD5("m:") + USE_FEATURE_HTTPD_SETUID("u:") + "p:if"; + + +int httpd_main(int argc, char *argv[]) +{ + unsigned opt; + const char *home_httpd = home; + char *url_for_decode; + USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;) + const char *s_port; + USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;) + USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;) + USE_FEATURE_HTTPD_AUTH_MD5(const char *pass;) + +#if ENABLE_LOCALE_SUPPORT + /* Undo busybox.c: we want to speak English in http (dates etc) */ + setlocale(LC_TIME, "C"); +#endif + + config = xzalloc(sizeof(*config)); +#if ENABLE_FEATURE_HTTPD_BASIC_AUTH + config->realm = "Web Server Authentication"; +#endif + config->port = 80; + config->ContentLength = -1; + + opt = getopt32(argc, argv, httpd_opts, + &(config->configFile), &url_for_decode, &home_httpd + USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode) + USE_FEATURE_HTTPD_BASIC_AUTH(, &(config->realm)) + USE_FEATURE_HTTPD_AUTH_MD5(, &pass) + USE_FEATURE_HTTPD_SETUID(, &s_ugid) + , &s_port + ); + if (opt & OPT_DECODE_URL) { + printf("%s", decodeString(url_for_decode, 1)); + return 0; + } +#if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR + if (opt & OPT_ENCODE_URL) { + printf("%s", encodeString(url_for_encode)); + return 0; + } +#endif +#if ENABLE_FEATURE_HTTPD_AUTH_MD5 + if (opt & OPT_MD5) { + puts(pw_encrypt(pass, "$1$")); + return 0; + } +#endif + if (opt & OPT_PORT) + config->port = xatou16(s_port); + +#if ENABLE_FEATURE_HTTPD_SETUID + if (opt & OPT_SETUID) { + char *e; + // FIXME: what the default group should be? + ugid.gid = -1; + ugid.uid = bb_strtoul(s_ugid, &e, 0); + if (*e == ':') { + e++; + ugid.gid = bb_strtoul(e, NULL, 0); + } + if (errno) { + /* not integer */ + if (!uidgid_get(&ugid, s_ugid)) + bb_error_msg_and_die("unrecognized user[:group] " + "name '%s'", s_ugid); + } + } +#endif + + xchdir(home_httpd); + if (!(opt & OPT_INETD)) { + config->server_socket = openServer(); +#if ENABLE_FEATURE_HTTPD_SETUID + /* drop privileges */ + if (opt & OPT_SETUID) { + if (ugid.gid != (gid_t)-1) { + if (setgroups(1, &ugid.gid) == -1) + bb_perror_msg_and_die("setgroups"); + xsetgid(ugid.gid); + } + xsetuid(ugid.uid); + } +#endif + } + +#if ENABLE_FEATURE_HTTPD_CGI + { + char *p = getenv("PATH"); + p = xstrdup(p); /* if gets NULL, returns NULL */ + clearenv(); + if (p) + setenv1("PATH", p); + if (!(opt & OPT_INETD)) + setenv_long("SERVER_PORT", config->port); + } +#endif + +#if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP + sighup_handler(0); +#else + parse_conf(default_path_httpd_conf, FIRST_PARSE); +#endif + + if (opt & OPT_INETD) + return miniHttpd_inetd(); + + if (!(opt & OPT_FOREGROUND)) + xdaemon(1, 0); /* don't change current directory */ + return miniHttpd(config->server_socket); +} |