1 |
/* |
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* Hydra, an http server |
3 |
* Copyright (C) 1995 Paul Phillips <paulp@go2net.com> |
4 |
* Some changes Copyright (C) 1996,97 Larry Doolittle <ldoolitt@boa.org> |
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* Some changes Copyright (C) 1996 Charles F. Randall <crandall@goldsys.com> |
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* Some changes Copyright (C) 1997-2002 Jon Nelson <jnelson@boa.org> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 1, or (at your option) |
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* any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
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* |
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*/ |
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|
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/* $Id: cgi.c,v 1.24.2.3 2003/01/17 17:19:15 nmav Exp $ */ |
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|
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#include "boa.h" |
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|
28 |
static char *env_gen_extra(const char *key, const char *value, int extra); |
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|
30 |
int verbose_cgi_logs = 0; |
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/* The +1 is for the the NULL in complete_env */ |
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static char *common_cgi_env[COMMON_CGI_COUNT + 1]; |
33 |
|
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/* |
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* Name: create_common_env |
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* |
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* Description: Set up the environment variables that are common to |
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* all CGI scripts |
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*/ |
40 |
|
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void create_common_env() |
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{ |
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int index = 0, i; |
44 |
|
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|
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/* NOTE NOTE NOTE: |
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If you (the reader) someday modify this chunk of code to |
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handle more "common" CGI environment variables, then bump the |
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value COMMON_CGI_COUNT in defines.h UP |
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|
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Also, in the case of document_root and server_admin, two variables |
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that may or may not be defined depending on the way the server |
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is configured, we check for null values and use an empty |
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string to denote a NULL value to the environment, as per the |
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specification. The quote for which follows: |
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|
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"In all cases, a missing environment variable is |
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equivalent to a zero-length (NULL) value, and vice versa." |
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*/ |
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common_cgi_env[index++] = env_gen_extra("PATH", |
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((cgi_path != |
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NULL) ? cgi_path : |
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DEFAULT_PATH), 0); |
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common_cgi_env[index++] = |
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env_gen_extra("SERVER_SOFTWARE", SERVER_NAME "/" SERVER_VERSION, 0); |
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common_cgi_env[index++] = |
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env_gen_extra("GATEWAY_INTERFACE", CGI_VERSION, 0); |
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|
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/* removed the SERVER_PORT which may change due to SSL support |
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* Also removed the DOCUMENT_ROOT, SERVER_NAME, which are now per request. |
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*/ |
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|
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|
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/* NCSA added */ |
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#ifdef USE_NCSA_CGI_ENV |
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common_cgi_env[index++] = env_gen_extra("SERVER_ROOT", server_root); |
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#endif |
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|
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/* APACHE added */ |
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common_cgi_env[index++] = |
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env_gen_extra("SERVER_ADMIN", server_admin, 0); |
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common_cgi_env[index] = NULL; |
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|
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/* Sanity checking -- make *sure* the memory got allocated */ |
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if (index > COMMON_CGI_COUNT) { |
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log_error_time(); |
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fprintf(stderr, "COMMON_CGI_COUNT not high enough.\n"); |
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exit(1); |
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} |
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|
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for (i = 0; i < index; ++i) { |
92 |
if (common_cgi_env[i] == NULL) { |
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log_error_time(); |
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fprintf(stderr, |
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"Unable to allocate a component of common_cgi_env - out of memory.\n"); |
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exit(1); |
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} |
98 |
} |
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} |
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|
101 |
void clear_common_env(void) |
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{ |
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int i; |
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|
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for (i = 0; i <= COMMON_CGI_COUNT; ++i) { |
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if (common_cgi_env[i] != NULL) { |
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free(common_cgi_env[i]); |
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common_cgi_env[i] = NULL; |
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} |
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} |
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} |
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|
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/* |
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* Name: env_gen_extra |
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* (and via a not-so-tricky #define, env_gen) |
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* This routine calls malloc: please free the memory when you are done |
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*/ |
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static char *env_gen_extra(const char *key, const char *value, int extra) |
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{ |
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char *result; |
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int key_len, value_len; |
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|
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if (value == NULL) /* ServerAdmin may not be defined, eg */ |
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value = ""; |
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key_len = strlen(key); |
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value_len = strlen(value); |
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/* leave room for '=' sign and null terminator */ |
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result = malloc(extra + key_len + value_len + 2); |
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if (result) { |
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memcpy(result + extra, key, key_len); |
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*(result + extra + key_len) = '='; |
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memcpy(result + extra + key_len + 1, value, value_len); |
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*(result + extra + key_len + value_len + 1) = '\0'; |
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} else { |
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log_error_time(); |
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perror("malloc"); |
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log_error_time(); |
138 |
fprintf(stderr, |
139 |
"tried to allocate (key=value) extra=%d: %s=%s\n", |
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extra, key, value); |
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} |
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return result; |
143 |
} |
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|
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/* |
146 |
* Name: add_cgi_env |
147 |
* |
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* Description: adds a variable to CGI's environment |
149 |
* Used for HTTP_ headers |
150 |
*/ |
151 |
|
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int add_cgi_env(request * req, const char *key, const char *value, |
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int http_prefix) |
154 |
{ |
155 |
char *p; |
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int prefix_len; |
157 |
|
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if (http_prefix) { |
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prefix_len = 5; |
160 |
} else { |
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prefix_len = 0; |
162 |
} |
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|
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if (req->cgi_env_index < CGI_ENV_MAX) { |
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p = env_gen_extra(key, value, prefix_len); |
166 |
if (!p) { |
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log_error_time(); |
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fprintf(stderr, "Unable to generate additional CGI Environment" |
169 |
"variable -- ran out of memory!\n"); |
170 |
} |
171 |
if (prefix_len) |
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memcpy(p, "HTTP_", 5); |
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req->cgi_env[req->cgi_env_index++] = p; |
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return 1; |
175 |
} else { |
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log_error_time(); |
177 |
fprintf(stderr, "Unable to generate additional CGI Environment" |
178 |
"variable -- not enough space!\n"); |
179 |
} |
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return 0; |
181 |
} |
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|
183 |
#define my_add_cgi_env(req, key, value) { \ |
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int ok = add_cgi_env(req, key, value, 0); \ |
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if (!ok) return 0; \ |
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} |
187 |
|
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const char *hydra_method_str(int method) |
189 |
{ |
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char *w; |
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switch (method) { |
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case M_POST: |
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w = "POST"; |
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break; |
195 |
case M_HEAD: |
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w = "HEAD"; |
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break; |
198 |
case M_GET: |
199 |
w = "GET"; |
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break; |
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default: |
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w = "UNKNOWN"; |
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break; |
204 |
} |
205 |
return w; |
206 |
} |
207 |
|
208 |
/* |
209 |
* Name: complete_env |
210 |
* |
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* Description: adds the known client header env variables |
212 |
* and terminates the environment array |
213 |
*/ |
214 |
|
215 |
int complete_env(request * req) |
216 |
{ |
217 |
int i; |
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char buf[22]; |
219 |
const char *w; |
220 |
|
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for (i = 0; common_cgi_env[i]; i++) |
222 |
req->cgi_env[i] = common_cgi_env[i]; |
223 |
|
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w = hydra_method_str(req->method); |
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my_add_cgi_env(req, "REQUEST_METHOD", w); |
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|
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if (req->secure) { |
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simple_itoa(ssl_port, buf); |
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} else { |
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simple_itoa(server_port, buf); |
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} |
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my_add_cgi_env(req, "SERVER_PORT", buf); |
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my_add_cgi_env(req, "SERVER_NAME", req->hostname); |
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|
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/* NCSA and APACHE added -- not in CGI spec */ |
236 |
#ifdef USE_NCSA_CGI_ENV |
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my_add_cgi_env( req, "DOCUMENT_ROOT", req->document_root); |
238 |
#endif |
239 |
|
240 |
my_add_cgi_env(req, "SERVER_ADDR", req->local_ip_addr); |
241 |
my_add_cgi_env(req, "SERVER_PROTOCOL", req->http_version_str); |
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my_add_cgi_env(req, "REQUEST_URI", req->request_uri); |
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|
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if (req->path_info) |
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my_add_cgi_env(req, "PATH_INFO", req->path_info); |
246 |
|
247 |
if (req->path_translated) |
248 |
/* while path_translated depends on path_info, |
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* there are cases when path_translated might |
250 |
* not exist when path_info does |
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*/ |
252 |
my_add_cgi_env(req, "PATH_TRANSLATED", req->path_translated); |
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|
254 |
my_add_cgi_env(req, "SCRIPT_NAME", req->script_name); |
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|
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if (req->query_string) |
257 |
my_add_cgi_env(req, "QUERY_STRING", req->query_string); |
258 |
my_add_cgi_env(req, "REMOTE_ADDR", req->remote_ip_addr); |
259 |
|
260 |
simple_itoa(req->remote_port, buf); |
261 |
my_add_cgi_env(req, "REMOTE_PORT", buf); |
262 |
|
263 |
if (req->method == M_POST) { |
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if (req->content_type) { |
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my_add_cgi_env(req, "CONTENT_TYPE", req->content_type); |
266 |
} else { |
267 |
my_add_cgi_env(req, "CONTENT_TYPE", default_type); |
268 |
} |
269 |
if (req->content_length) { |
270 |
my_add_cgi_env(req, "CONTENT_LENGTH", req->content_length); |
271 |
} |
272 |
} |
273 |
#ifdef ACCEPT_ON |
274 |
if (req->accept[0]) |
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my_add_cgi_env(req, "HTTP_ACCEPT", req->accept); |
276 |
#endif |
277 |
|
278 |
if (req->cgi_env_index < CGI_ENV_MAX + 1) { |
279 |
req->cgi_env[req->cgi_env_index] = NULL; /* terminate */ |
280 |
return 1; |
281 |
} |
282 |
log_error_time(); |
283 |
fprintf(stderr, "Not enough space in CGI environment for remainder" |
284 |
" of variables.\n"); |
285 |
return 0; |
286 |
} |
287 |
|
288 |
/* |
289 |
* Name: make_args_cgi |
290 |
* |
291 |
* Build argv list for a CGI script according to spec |
292 |
* |
293 |
*/ |
294 |
|
295 |
void create_argv(request * req, char **aargv) |
296 |
{ |
297 |
char *p, *q, *r; |
298 |
int aargc; |
299 |
|
300 |
q = req->query_string; |
301 |
aargv[0] = req->pathname; |
302 |
|
303 |
/* here, we handle a special "indexed" query string. |
304 |
* Taken from the CGI/1.1 SPEC: |
305 |
* This is identified by a GET or HEAD request with a query string |
306 |
* with no *unencoded* '=' in it. |
307 |
* For such a request, I'm supposed to parse the search string |
308 |
* into words, according to the following rules: |
309 |
|
310 |
search-string = search-word *( "+" search-word ) |
311 |
search-word = 1*schar |
312 |
schar = xunreserved | escaped | xreserved |
313 |
xunreserved = alpha | digit | xsafe | extra |
314 |
xsafe = "$" | "-" | "_" | "." |
315 |
xreserved = ";" | "/" | "?" | ":" | "@" | "&" |
316 |
|
317 |
After parsing, each word is URL-decoded, optionally encoded in a system |
318 |
defined manner, and then the argument list |
319 |
is set to the list of words. |
320 |
|
321 |
|
322 |
Thus, schar is alpha|digit|"$"|"-"|"_"|"."|";"|"/"|"?"|":"|"@"|"&" |
323 |
|
324 |
As of this writing, escape.pl escapes the following chars: |
325 |
|
326 |
"-", "_", ".", "!", "~", "*", "'", "(", ")", |
327 |
"0".."9", "A".."Z", "a".."z", |
328 |
";", "/", "?", ":", "@", "&", "=", "+", "\$", "," |
329 |
|
330 |
Which therefore means |
331 |
"=", "+", "~", "!", "*", "'", "(", ")", "," |
332 |
are *not* escaped and should be? |
333 |
Wait, we don't do any escaping, and nor should we. |
334 |
According to the RFC draft, we unescape and then re-escape |
335 |
in a "system defined manner" (here: none). |
336 |
|
337 |
The CGI/1.1 draft (03, latest is 1999???) is very unclear here. |
338 |
|
339 |
I am using the latest published RFC, 2396, for what does and does |
340 |
not need escaping. |
341 |
|
342 |
Since boa builds the argument list and does not call /bin/sh, |
343 |
(boa uses execve for CGI) |
344 |
*/ |
345 |
|
346 |
if (q && !strchr(q, '=')) { |
347 |
/* we have an 'index' style */ |
348 |
q = strdup(q); |
349 |
if (!q) { |
350 |
WARN("unable to strdup 'q' in create_argv!"); |
351 |
} |
352 |
for (aargc = 1; q && (aargc < CGI_ARGC_MAX);) { |
353 |
r = q; |
354 |
/* for an index-style CGI, + is used to seperate arguments |
355 |
* an escaped '+' is of no concern to us |
356 |
*/ |
357 |
if ((p = strchr(q, '+'))) { |
358 |
*p = '\0'; |
359 |
q = p + 1; |
360 |
} else { |
361 |
q = NULL; |
362 |
} |
363 |
if (unescape_uri(r, NULL)) { |
364 |
/* printf("parameter %d: %s\n",aargc,r); */ |
365 |
aargv[aargc++] = r; |
366 |
} |
367 |
} |
368 |
aargv[aargc] = NULL; |
369 |
} else { |
370 |
aargv[1] = NULL; |
371 |
} |
372 |
} |
373 |
|
374 |
|
375 |
/* |
376 |
* Name: init_cgi |
377 |
* |
378 |
* Description: Called for GET/POST requests that refer to ScriptAlias |
379 |
* directories or application/x-httpd-cgi files. Pipes are used for the |
380 |
* communication with the child. |
381 |
* stderr remains tied to our log file; is this good? |
382 |
* |
383 |
* Returns: |
384 |
* 0 - error or NPH, either way the socket is closed |
385 |
* 1 - success |
386 |
*/ |
387 |
|
388 |
int init_cgi(request * req) |
389 |
{ |
390 |
int child_pid; |
391 |
int pipes[2]; |
392 |
|
393 |
SQUASH_KA(req); |
394 |
|
395 |
if (req->is_cgi == NPH || req->is_cgi == CGI || req->is_cgi == HIC_CGI |
396 |
|| req->is_cgi == CGI_ACTION) |
397 |
{ |
398 |
if (req->secure && complete_env_ssl(req) == 0) { |
399 |
return 0; |
400 |
} |
401 |
if (complete_env(req) == 0) { |
402 |
return 0; |
403 |
} |
404 |
} |
405 |
#ifdef FASCIST_LOGGING |
406 |
{ |
407 |
int i; |
408 |
for (i = 0; i < req->cgi_env_index; ++i) |
409 |
fprintf(stderr, "%s - environment variable for cgi: \"%s\"\n", |
410 |
__FILE__, req->cgi_env[i]); |
411 |
} |
412 |
#endif |
413 |
|
414 |
if (req->is_cgi) { |
415 |
if (pipe(pipes) == -1) { |
416 |
log_error_time(); |
417 |
perror("pipe"); |
418 |
return 0; |
419 |
} |
420 |
|
421 |
/* set the read end of the socket to non-blocking */ |
422 |
if (set_nonblock_fd(pipes[0]) == -1) { |
423 |
log_error_time(); |
424 |
perror("cgi-fcntl"); |
425 |
close(pipes[0]); |
426 |
close(pipes[1]); |
427 |
return 0; |
428 |
} |
429 |
} else { |
430 |
log_error_time(); |
431 |
fprintf(stderr, "Non CGI in init_cgi()!\n"); |
432 |
return 0; |
433 |
} |
434 |
|
435 |
if (req->is_cgi == HIC_CGI) { /* internally handled cgi */ |
436 |
#ifdef ENABLE_HIC |
437 |
/* Move the post_data_fd pointer to start. |
438 |
*/ |
439 |
if (req->post_data_fd.pipe==0) |
440 |
lseek(req->post_data_fd.fds[0], SEEK_SET, 0); |
441 |
else { /* close the write end */ |
442 |
close(req->post_data_fd.fds[1]); |
443 |
req->post_data_fd.fds[1] = -1; |
444 |
} |
445 |
|
446 |
if (hic_send_command(req, pipes[1]) == -1) { |
447 |
log_error_time(); |
448 |
fprintf(stderr, "Error executing HIC command.\n"); |
449 |
close(pipes[0]); |
450 |
close(pipes[1]); |
451 |
return 0; |
452 |
} |
453 |
#else /* No hic! */ |
454 |
close(pipes[0]); |
455 |
close(pipes[1]); |
456 |
return 0; |
457 |
#endif |
458 |
} else { /* plain cgi... do fork */ |
459 |
child_pid = fork(); |
460 |
switch (child_pid) { |
461 |
case -1: |
462 |
/* fork unsuccessful */ |
463 |
log_error_time(); |
464 |
perror("fork"); |
465 |
|
466 |
close(pipes[0]); |
467 |
close(pipes[1]); |
468 |
|
469 |
send_r_error(req); |
470 |
/* FIXME: There is aproblem here. send_r_error would work |
471 |
for NPH and CGI, but not for GUNZIP. Fix that. */ |
472 |
/* i'd like to send_r_error, but.... */ |
473 |
return 0; |
474 |
break; |
475 |
case 0: |
476 |
/* child */ |
477 |
if (req->is_cgi == CGI || req->is_cgi == NPH || req->is_cgi == CGI_ACTION) |
478 |
{ |
479 |
int l; |
480 |
char *newpath; |
481 |
char *c; |
482 |
|
483 |
c = strrchr(req->pathname, '/'); |
484 |
if (!c) { |
485 |
/* there will always be a '.' */ |
486 |
log_error_time(); |
487 |
WARN("unable to find '/' in req->pathname"); |
488 |
close(pipes[1]); |
489 |
_exit(1); |
490 |
} |
491 |
|
492 |
*c = '\0'; |
493 |
|
494 |
if (chdir(req->pathname) != 0) { |
495 |
log_error_time(); |
496 |
perror("chdir"); |
497 |
close(pipes[1]); |
498 |
_exit(1); |
499 |
} |
500 |
|
501 |
req->pathname = ++c; |
502 |
l = strlen(req->pathname) + 3; |
503 |
/* prefix './' */ |
504 |
newpath = malloc(sizeof(char) * l); |
505 |
if (!newpath) { |
506 |
/* there will always be a '.' */ |
507 |
log_error_time(); |
508 |
perror("unable to malloc for newpath"); |
509 |
close(pipes[1]); |
510 |
_exit(1); |
511 |
} |
512 |
newpath[0] = '.'; |
513 |
newpath[1] = '/'; |
514 |
memcpy(&newpath[2], req->pathname, l - 2); /* includes the trailing '\0' */ |
515 |
req->pathname = newpath; |
516 |
} |
517 |
|
518 |
/* close the 'read' end of the pipes[] */ |
519 |
close(pipes[0]); |
520 |
|
521 |
/* tie cgi's STDOUT to our write end of pipe */ |
522 |
if (dup2(pipes[1], STDOUT_FILENO) == -1) { |
523 |
log_error_time(); |
524 |
perror("dup2 - pipes"); |
525 |
_exit(1); |
526 |
} |
527 |
close(pipes[1]); |
528 |
|
529 |
/* tie post_data_fd to POST stdin */ |
530 |
if (req->method == M_POST) { /* tie stdin to file */ |
531 |
if (req->post_data_fd.pipe==0) { |
532 |
lseek(req->post_data_fd.fds[0], SEEK_SET, 0); |
533 |
} |
534 |
|
535 |
dup2(req->post_data_fd.fds[0], STDIN_FILENO); |
536 |
close_tmp_fd( &req->post_data_fd); |
537 |
} |
538 |
|
539 |
umask(cgi_umask); /* change umask *again* u=rwx,g=rxw,o= */ |
540 |
|
541 |
/* |
542 |
* tie STDERR to cgi_log_fd |
543 |
* cgi_log_fd will automatically close, close-on-exec rocks! |
544 |
* if we don't tied STDERR (current log_error) to cgi_log_fd, |
545 |
* then we ought to close it. |
546 |
*/ |
547 |
if (cgi_log_fd) { |
548 |
dup2(cgi_log_fd, STDERR_FILENO); |
549 |
close( cgi_log_fd); |
550 |
} |
551 |
|
552 |
if (req->is_cgi == NPH || req->is_cgi == CGI) { |
553 |
char *aargv[CGI_ARGC_MAX + 1]; |
554 |
create_argv(req, aargv); |
555 |
execve(req->pathname, aargv, req->cgi_env); |
556 |
} else if (req->is_cgi == CGI_ACTION) { |
557 |
char *aargv[CGI_ARGC_MAX + 2]; |
558 |
aargv[0] = req->action; |
559 |
create_argv(req, &aargv[1]); |
560 |
execve(req->action, aargv, req->cgi_env); |
561 |
} else { |
562 |
if (req->is_cgi == INDEXER_CGI) |
563 |
execl(dirmaker, dirmaker, req->pathname, req->request_uri, |
564 |
NULL); |
565 |
} |
566 |
/* execve failed */ |
567 |
WARN(req->pathname); |
568 |
_exit(1); |
569 |
|
570 |
break; /* it doesn't matter, we never make it until here */ |
571 |
|
572 |
default: |
573 |
/* parent */ |
574 |
/* if here, fork was successful */ |
575 |
if (verbose_cgi_logs) { |
576 |
log_error_time(); |
577 |
fprintf(stderr, "Forked child \"%s\" pid %d\n", |
578 |
req->pathname, child_pid); |
579 |
} |
580 |
|
581 |
if (req->method == M_POST) { |
582 |
close_tmp_fd( &req->post_data_fd); |
583 |
} |
584 |
|
585 |
/* NPH, etc... all go straight to the fd */ |
586 |
|
587 |
close(pipes[1]); |
588 |
break; |
589 |
} |
590 |
} /* HIC */ |
591 |
|
592 |
/* we only get here in parent case, and |
593 |
* success. |
594 |
*/ |
595 |
|
596 |
req->data_fd = pipes[0]; |
597 |
|
598 |
req->status = PIPE_READ; |
599 |
if (req->is_cgi == CGI || req->is_cgi == HIC_CGI || req->is_cgi == CGI_ACTION) |
600 |
{ |
601 |
req->cgi_status = CGI_PARSE; /* got to parse cgi header */ |
602 |
/* for cgi_header... I get half the buffer! */ |
603 |
req->header_line = req->header_end = (req->buffer + BUFFER_SIZE / 2); |
604 |
} else { /* HIC CGIs and NPH CGIs */ |
605 |
req->cgi_status = CGI_BUFFER; |
606 |
/* I get all the buffer! */ |
607 |
req->header_line = req->header_end = req->buffer; |
608 |
} |
609 |
|
610 |
/* reset req->filepos for logging (it's used in pipe.c) */ |
611 |
/* still don't know why req->filesize might be reset though */ |
612 |
req->filepos = 0; |
613 |
|
614 |
return 1; |
615 |
} |