| 1 |
/* |
| 2 |
* Boa, an http server |
| 3 |
* Copyright (C) 1995 Paul Phillips <paulp@go2net.com> |
| 4 |
* Some changes Copyright (C) 1996,97 Larry Doolittle <ldoolitt@boa.org> |
| 5 |
* Some changes Copyright (C) 1996 Charles F. Randall <crandall@goldsys.com> |
| 6 |
* Some changes Copyright (C) 1997-2002 Jon Nelson <jnelson@boa.org> |
| 7 |
* |
| 8 |
* This program is free software; you can redistribute it and/or modify |
| 9 |
* it under the terms of the GNU General Public License as published by |
| 10 |
* the Free Software Foundation; either version 1, or (at your option) |
| 11 |
* any later version. |
| 12 |
* |
| 13 |
* This program is distributed in the hope that it will be useful, |
| 14 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 |
* GNU General Public License for more details. |
| 17 |
* |
| 18 |
* You should have received a copy of the GNU General Public License |
| 19 |
* along with this program; if not, write to the Free Software |
| 20 |
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 21 |
* |
| 22 |
*/ |
| 23 |
|
| 24 |
/* $Id: cgi.c,v 1.8 2002/09/27 10:35:20 nmav Exp $ */ |
| 25 |
|
| 26 |
#include "boa.h" |
| 27 |
|
| 28 |
static char *env_gen_extra(const char *key, const char *value, int extra); |
| 29 |
|
| 30 |
int verbose_cgi_logs = 0; |
| 31 |
/* The +1 is for the the NULL in complete_env */ |
| 32 |
static char *common_cgi_env[COMMON_CGI_COUNT + 1]; |
| 33 |
|
| 34 |
/* |
| 35 |
* Name: create_common_env |
| 36 |
* |
| 37 |
* Description: Set up the environment variables that are common to |
| 38 |
* all CGI scripts |
| 39 |
*/ |
| 40 |
|
| 41 |
void create_common_env() |
| 42 |
{ |
| 43 |
int index = 0, i; |
| 44 |
|
| 45 |
|
| 46 |
/* NOTE NOTE NOTE: |
| 47 |
If you (the reader) someday modify this chunk of code to |
| 48 |
handle more "common" CGI environment variables, then bump the |
| 49 |
value COMMON_CGI_COUNT in defines.h UP |
| 50 |
|
| 51 |
Also, in the case of document_root and server_admin, two variables |
| 52 |
that may or may not be defined depending on the way the server |
| 53 |
is configured, we check for null values and use an empty |
| 54 |
string to denote a NULL value to the environment, as per the |
| 55 |
specification. The quote for which follows: |
| 56 |
|
| 57 |
"In all cases, a missing environment variable is |
| 58 |
equivalent to a zero-length (NULL) value, and vice versa." |
| 59 |
*/ |
| 60 |
common_cgi_env[index++] = env_gen_extra("PATH", |
| 61 |
((cgi_path != |
| 62 |
NULL) ? cgi_path : |
| 63 |
DEFAULT_PATH), 0); |
| 64 |
common_cgi_env[index++] = |
| 65 |
env_gen_extra("SERVER_SOFTWARE", SERVER_NAME "/" SERVER_VERSION, 0); |
| 66 |
common_cgi_env[index++] = |
| 67 |
env_gen_extra("GATEWAY_INTERFACE", CGI_VERSION, 0); |
| 68 |
|
| 69 |
/* removed the SERVER_PORT which may change due to SSL support |
| 70 |
* Also removed the DOCUMENT_ROOT, SERVER_NAME, which are now per request. |
| 71 |
*/ |
| 72 |
|
| 73 |
|
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/* NCSA added */ |
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/* common_cgi_env[index++] = env_gen_extra("SERVER_ROOT", server_root); */ |
| 76 |
|
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/* APACHE added */ |
| 78 |
common_cgi_env[index++] = |
| 79 |
env_gen_extra("SERVER_ADMIN", server_admin, 0); |
| 80 |
common_cgi_env[index] = NULL; |
| 81 |
|
| 82 |
/* Sanity checking -- make *sure* the memory got allocated */ |
| 83 |
if (index > COMMON_CGI_COUNT) { |
| 84 |
log_error_time(); |
| 85 |
fprintf(stderr, "COMMON_CGI_COUNT not high enough.\n"); |
| 86 |
exit(1); |
| 87 |
} |
| 88 |
|
| 89 |
for (i = 0; i < index; ++i) { |
| 90 |
if (common_cgi_env[i] == NULL) { |
| 91 |
log_error_time(); |
| 92 |
fprintf(stderr, |
| 93 |
"Unable to allocate a component of common_cgi_env - out of memory.\n"); |
| 94 |
exit(1); |
| 95 |
} |
| 96 |
} |
| 97 |
} |
| 98 |
|
| 99 |
void clear_common_env(void) |
| 100 |
{ |
| 101 |
int i; |
| 102 |
|
| 103 |
for (i = 0; i <= COMMON_CGI_COUNT; ++i) { |
| 104 |
if (common_cgi_env[i] != NULL) { |
| 105 |
free(common_cgi_env[i]); |
| 106 |
common_cgi_env[i] = NULL; |
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} |
| 108 |
} |
| 109 |
} |
| 110 |
|
| 111 |
/* |
| 112 |
* Name: env_gen_extra |
| 113 |
* (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 |
| 115 |
*/ |
| 116 |
static char *env_gen_extra(const char *key, const char *value, int extra) |
| 117 |
{ |
| 118 |
char *result; |
| 119 |
int key_len, value_len; |
| 120 |
|
| 121 |
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); |
| 127 |
if (result) { |
| 128 |
memcpy(result + extra, key, key_len); |
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*(result + extra + key_len) = '='; |
| 130 |
memcpy(result + extra + key_len + 1, value, value_len); |
| 131 |
*(result + extra + key_len + value_len + 1) = '\0'; |
| 132 |
} else { |
| 133 |
log_error_time(); |
| 134 |
perror("malloc"); |
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log_error_time(); |
| 136 |
fprintf(stderr, |
| 137 |
"tried to allocate (key=value) extra=%d: %s=%s\n", |
| 138 |
extra, key, value); |
| 139 |
} |
| 140 |
return result; |
| 141 |
} |
| 142 |
|
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/* |
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* Name: add_cgi_env |
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* |
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* Description: adds a variable to CGI's environment |
| 147 |
* Used for HTTP_ headers |
| 148 |
*/ |
| 149 |
|
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int add_cgi_env(request * req, const char *key, const char *value, int http_prefix) |
| 151 |
{ |
| 152 |
char *p; |
| 153 |
int prefix_len; |
| 154 |
|
| 155 |
if (http_prefix) { |
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prefix_len = 5; |
| 157 |
} else { |
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prefix_len = 0; |
| 159 |
} |
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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); |
| 163 |
if (!p) { |
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log_error_time(); |
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fprintf(stderr, "Unable to generate additional CGI Environment" |
| 166 |
"variable -- ran out of memory!\n"); |
| 167 |
} |
| 168 |
if (prefix_len) |
| 169 |
memcpy(p, "HTTP_", 5); |
| 170 |
req->cgi_env[req->cgi_env_index++] = p; |
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return 1; |
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} else { |
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log_error_time(); |
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fprintf(stderr, "Unable to generate additional CGI Environment" |
| 175 |
"variable -- not enough space!\n"); |
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} |
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return 0; |
| 178 |
} |
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|
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#define my_add_cgi_env(req, key, value) { \ |
| 181 |
int ok = add_cgi_env(req, key, value, 0); \ |
| 182 |
if (!ok) return 0; \ |
| 183 |
} |
| 184 |
|
| 185 |
const char* hydra_method_str( int method) |
| 186 |
{ |
| 187 |
char *w; |
| 188 |
switch ( method) { |
| 189 |
case M_POST: |
| 190 |
w = "POST"; |
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break; |
| 192 |
case M_HEAD: |
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w = "HEAD"; |
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break; |
| 195 |
case M_GET: |
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w = "GET"; |
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break; |
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default: |
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w = "UNKNOWN"; |
| 200 |
break; |
| 201 |
} |
| 202 |
return w; |
| 203 |
} |
| 204 |
|
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/* |
| 206 |
* Name: complete_env |
| 207 |
* |
| 208 |
* Description: adds the known client header env variables |
| 209 |
* and terminates the environment array |
| 210 |
*/ |
| 211 |
|
| 212 |
int complete_env(request * req) |
| 213 |
{ |
| 214 |
int i; |
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char buf[22]; |
| 216 |
const char* w; |
| 217 |
|
| 218 |
for (i = 0; common_cgi_env[i]; i++) |
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req->cgi_env[i] = common_cgi_env[i]; |
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|
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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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|
| 224 |
if (req->secure) { |
| 225 |
simple_itoa(ssl_port, buf); |
| 226 |
} else { |
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simple_itoa(server_port, buf); |
| 228 |
} |
| 229 |
my_add_cgi_env(req, "SERVER_PORT", buf); |
| 230 |
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 */ |
| 233 |
/* my_add_cgi_env( req, "DOCUMENT_ROOT", req->document_root); */ |
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|
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my_add_cgi_env(req, "SERVER_ADDR", req->local_ip_addr); |
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my_add_cgi_env(req, "SERVER_PROTOCOL", req->http_version); |
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my_add_cgi_env(req, "REQUEST_URI", req->request_uri); |
| 238 |
|
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if (req->path_info) |
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my_add_cgi_env(req, "PATH_INFO", req->path_info); |
| 241 |
|
| 242 |
if (req->path_translated) |
| 243 |
/* while path_translated depends on path_info, |
| 244 |
* there are cases when path_translated might |
| 245 |
* not exist when path_info does |
| 246 |
*/ |
| 247 |
my_add_cgi_env(req, "PATH_TRANSLATED", req->path_translated); |
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|
| 249 |
my_add_cgi_env(req, "SCRIPT_NAME", req->script_name); |
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|
| 251 |
if (req->query_string) |
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my_add_cgi_env(req, "QUERY_STRING", req->query_string); |
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my_add_cgi_env(req, "REMOTE_ADDR", req->remote_ip_addr); |
| 254 |
|
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simple_itoa(req->remote_port, buf); |
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my_add_cgi_env(req, "REMOTE_PORT", buf); |
| 257 |
|
| 258 |
if (req->method == M_POST) { |
| 259 |
if (req->content_type) { |
| 260 |
my_add_cgi_env(req, "CONTENT_TYPE", req->content_type); |
| 261 |
} else { |
| 262 |
my_add_cgi_env(req, "CONTENT_TYPE", default_type); |
| 263 |
} |
| 264 |
if (req->content_length) { |
| 265 |
my_add_cgi_env(req, "CONTENT_LENGTH", req->content_length); |
| 266 |
} |
| 267 |
} |
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#ifdef ACCEPT_ON |
| 269 |
if (req->accept[0]) |
| 270 |
my_add_cgi_env(req, "HTTP_ACCEPT", req->accept); |
| 271 |
#endif |
| 272 |
|
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if (req->cgi_env_index < CGI_ENV_MAX + 1) { |
| 274 |
req->cgi_env[req->cgi_env_index] = NULL; /* terminate */ |
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return 1; |
| 276 |
} |
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log_error_time(); |
| 278 |
fprintf(stderr, "Not enough space in CGI environment for remainder" |
| 279 |
" of variables.\n"); |
| 280 |
return 0; |
| 281 |
} |
| 282 |
|
| 283 |
/* |
| 284 |
* Name: make_args_cgi |
| 285 |
* |
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* Build argv list for a CGI script according to spec |
| 287 |
* |
| 288 |
*/ |
| 289 |
|
| 290 |
void create_argv(request * req, char **aargv) |
| 291 |
{ |
| 292 |
char *p, *q, *r; |
| 293 |
int aargc; |
| 294 |
|
| 295 |
q = req->query_string; |
| 296 |
aargv[0] = req->pathname; |
| 297 |
|
| 298 |
/* here, we handle a special "indexed" query string. |
| 299 |
* Taken from the CGI/1.1 SPEC: |
| 300 |
* This is identified by a GET or HEAD request with a query string |
| 301 |
* with no *unencoded* '=' in it. |
| 302 |
* For such a request, I'm supposed to parse the search string |
| 303 |
* into words, according to the following rules: |
| 304 |
|
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search-string = search-word *( "+" search-word ) |
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search-word = 1*schar |
| 307 |
schar = xunreserved | escaped | xreserved |
| 308 |
xunreserved = alpha | digit | xsafe | extra |
| 309 |
xsafe = "$" | "-" | "_" | "." |
| 310 |
xreserved = ";" | "/" | "?" | ":" | "@" | "&" |
| 311 |
|
| 312 |
After parsing, each word is URL-decoded, optionally encoded in a system |
| 313 |
defined manner, and then the argument list |
| 314 |
is set to the list of words. |
| 315 |
|
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|
| 317 |
Thus, schar is alpha|digit|"$"|"-"|"_"|"."|";"|"/"|"?"|":"|"@"|"&" |
| 318 |
|
| 319 |
As of this writing, escape.pl escapes the following chars: |
| 320 |
|
| 321 |
"-", "_", ".", "!", "~", "*", "'", "(", ")", |
| 322 |
"0".."9", "A".."Z", "a".."z", |
| 323 |
";", "/", "?", ":", "@", "&", "=", "+", "\$", "," |
| 324 |
|
| 325 |
Which therefore means |
| 326 |
"=", "+", "~", "!", "*", "'", "(", ")", "," |
| 327 |
are *not* escaped and should be? |
| 328 |
Wait, we don't do any escaping, and nor should we. |
| 329 |
According to the RFC draft, we unescape and then re-escape |
| 330 |
in a "system defined manner" (here: none). |
| 331 |
|
| 332 |
The CGI/1.1 draft (03, latest is 1999???) is very unclear here. |
| 333 |
|
| 334 |
I am using the latest published RFC, 2396, for what does and does |
| 335 |
not need escaping. |
| 336 |
|
| 337 |
Since boa builds the argument list and does not call /bin/sh, |
| 338 |
(boa uses execve for CGI) |
| 339 |
*/ |
| 340 |
|
| 341 |
if (q && !strchr(q, '=')) { |
| 342 |
/* we have an 'index' style */ |
| 343 |
q = strdup(q); |
| 344 |
if (!q) { |
| 345 |
WARN("unable to strdup 'q' in create_argv!"); |
| 346 |
} |
| 347 |
for (aargc = 1; q && (aargc < CGI_ARGC_MAX);) { |
| 348 |
r = q; |
| 349 |
/* for an index-style CGI, + is used to seperate arguments |
| 350 |
* an escaped '+' is of no concern to us |
| 351 |
*/ |
| 352 |
if ((p = strchr(q, '+'))) { |
| 353 |
*p = '\0'; |
| 354 |
q = p + 1; |
| 355 |
} else { |
| 356 |
q = NULL; |
| 357 |
} |
| 358 |
if (unescape_uri(r, NULL)) { |
| 359 |
/* printf("parameter %d: %s\n",aargc,r); */ |
| 360 |
aargv[aargc++] = r; |
| 361 |
} |
| 362 |
} |
| 363 |
aargv[aargc] = NULL; |
| 364 |
} else { |
| 365 |
aargv[1] = NULL; |
| 366 |
} |
| 367 |
} |
| 368 |
|
| 369 |
/* |
| 370 |
* Name: init_cgi |
| 371 |
* |
| 372 |
* Description: Called for GET/POST requests that refer to ScriptAlias |
| 373 |
* directories or application/x-httpd-cgi files. Pipes are used for the |
| 374 |
* communication with the child. |
| 375 |
* stderr remains tied to our log file; is this good? |
| 376 |
* |
| 377 |
* Returns: |
| 378 |
* 0 - error or NPH, either way the socket is closed |
| 379 |
* 1 - success |
| 380 |
*/ |
| 381 |
|
| 382 |
int init_cgi(request * req) |
| 383 |
{ |
| 384 |
int child_pid; |
| 385 |
int pipes[2]; |
| 386 |
|
| 387 |
SQUASH_KA(req); |
| 388 |
|
| 389 |
if (req->is_cgi == NPH || req->is_cgi == CGI) { |
| 390 |
if (complete_env(req) == 0) { |
| 391 |
return 0; |
| 392 |
} |
| 393 |
} |
| 394 |
#ifdef FASCIST_LOGGING |
| 395 |
{ |
| 396 |
int i; |
| 397 |
for (i = 0; i < req->cgi_env_index; ++i) |
| 398 |
fprintf(stderr, "%s - environment variable for cgi: \"%s\"\n", |
| 399 |
__FILE__, req->cgi_env[i]); |
| 400 |
} |
| 401 |
#endif |
| 402 |
|
| 403 |
if (req->is_cgi) { |
| 404 |
if (pipe(pipes) == -1) { |
| 405 |
log_error_time(); |
| 406 |
perror("pipe"); |
| 407 |
return 0; |
| 408 |
} |
| 409 |
|
| 410 |
/* set the read end of the socket to non-blocking */ |
| 411 |
if (set_nonblock_fd(pipes[0]) == -1) { |
| 412 |
log_error_time(); |
| 413 |
perror("cgi-fcntl"); |
| 414 |
close(pipes[0]); |
| 415 |
close(pipes[1]); |
| 416 |
return 0; |
| 417 |
} |
| 418 |
} else { |
| 419 |
log_error_time(); |
| 420 |
fprintf(stderr, "Non CGI in init_cgi()!\n"); |
| 421 |
return 0; |
| 422 |
} |
| 423 |
|
| 424 |
child_pid = fork(); |
| 425 |
switch (child_pid) { |
| 426 |
case -1: |
| 427 |
/* fork unsuccessful */ |
| 428 |
log_error_time(); |
| 429 |
perror("fork"); |
| 430 |
|
| 431 |
close(pipes[0]); |
| 432 |
close(pipes[1]); |
| 433 |
|
| 434 |
send_r_error(req); |
| 435 |
/* FIXME: There is aproblem here. send_r_error would work |
| 436 |
for NPH and CGI, but not for GUNZIP. Fix that. */ |
| 437 |
/* i'd like to send_r_error, but.... */ |
| 438 |
return 0; |
| 439 |
break; |
| 440 |
case 0: |
| 441 |
/* child */ |
| 442 |
if (req->is_cgi == CGI || req->is_cgi == NPH) { |
| 443 |
char *foo = strdup(req->pathname); |
| 444 |
char *c; |
| 445 |
|
| 446 |
if (!foo) { |
| 447 |
WARN("unable to strdup pathname for req->pathname"); |
| 448 |
_exit(1); |
| 449 |
} |
| 450 |
c = strrchr(foo, '/'); |
| 451 |
if (c) { |
| 452 |
++c; |
| 453 |
*c = '\0'; |
| 454 |
} else { |
| 455 |
/* we have a serious problem */ |
| 456 |
log_error_time(); |
| 457 |
perror("chdir"); |
| 458 |
close(pipes[1]); |
| 459 |
_exit(1); |
| 460 |
} |
| 461 |
if (chdir(foo) != 0) { |
| 462 |
log_error_time(); |
| 463 |
perror("chdir"); |
| 464 |
close(pipes[1]); |
| 465 |
_exit(1); |
| 466 |
} |
| 467 |
} |
| 468 |
close(pipes[0]); |
| 469 |
/* tie cgi's STDOUT to it's write end of pipe */ |
| 470 |
if (dup2(pipes[1], STDOUT_FILENO) == -1) { |
| 471 |
log_error_time(); |
| 472 |
perror("dup2 - pipes"); |
| 473 |
close(pipes[1]); |
| 474 |
_exit(1); |
| 475 |
} |
| 476 |
close(pipes[1]); |
| 477 |
if (set_block_fd(STDOUT_FILENO) == -1) { |
| 478 |
log_error_time(); |
| 479 |
perror("cgi-fcntl"); |
| 480 |
_exit(1); |
| 481 |
} |
| 482 |
|
| 483 |
/* tie post_data_fd to POST stdin */ |
| 484 |
if (req->method == M_POST) { /* tie stdin to file */ |
| 485 |
lseek(req->post_data_fd, SEEK_SET, 0); |
| 486 |
dup2(req->post_data_fd, STDIN_FILENO); |
| 487 |
close(req->post_data_fd); |
| 488 |
} |
| 489 |
/* Close access log, so CGI program can't scribble |
| 490 |
* where it shouldn't |
| 491 |
*/ |
| 492 |
close_access_log(); |
| 493 |
|
| 494 |
/* |
| 495 |
* tie STDERR to cgi_log_fd |
| 496 |
* cgi_log_fd will automatically close, close-on-exec rocks! |
| 497 |
* if we don't tied STDERR (current log_error) to cgi_log_fd, |
| 498 |
* then we ought to close it. |
| 499 |
*/ |
| 500 |
if (!cgi_log_fd) |
| 501 |
dup2(devnullfd, STDERR_FILENO); |
| 502 |
else |
| 503 |
dup2(cgi_log_fd, STDERR_FILENO); |
| 504 |
|
| 505 |
if (req->is_cgi == NPH || req->is_cgi == CGI) { |
| 506 |
char *aargv[CGI_ARGC_MAX + 1]; |
| 507 |
create_argv(req, aargv); |
| 508 |
execve(req->pathname, aargv, req->cgi_env); |
| 509 |
} else { |
| 510 |
if (req->is_cgi == INDEXER_CGI) |
| 511 |
execl(dirmaker, dirmaker, req->pathname, req->request_uri, |
| 512 |
NULL); |
| 513 |
} |
| 514 |
/* execve failed */ |
| 515 |
WARN(req->pathname); |
| 516 |
_exit(1); |
| 517 |
break; |
| 518 |
|
| 519 |
default: |
| 520 |
/* parent */ |
| 521 |
/* if here, fork was successful */ |
| 522 |
if (verbose_cgi_logs) { |
| 523 |
log_error_time(); |
| 524 |
fprintf(stderr, "Forked child \"%s\" pid %d\n", |
| 525 |
req->pathname, child_pid); |
| 526 |
} |
| 527 |
|
| 528 |
if (req->method == M_POST) { |
| 529 |
close(req->post_data_fd); /* child closed it too */ |
| 530 |
req->post_data_fd = 0; |
| 531 |
} |
| 532 |
|
| 533 |
/* NPH, etc... all go straight to the fd */ |
| 534 |
|
| 535 |
close(pipes[1]); |
| 536 |
req->data_fd = pipes[0]; |
| 537 |
|
| 538 |
req->status = PIPE_READ; |
| 539 |
if (req->is_cgi == CGI) { |
| 540 |
req->cgi_status = CGI_PARSE; /* got to parse cgi header */ |
| 541 |
/* for cgi_header... I get half the buffer! */ |
| 542 |
req->header_line = req->header_end = |
| 543 |
(req->buffer + BUFFER_SIZE / 2); |
| 544 |
} else { |
| 545 |
req->cgi_status = CGI_BUFFER; |
| 546 |
/* I get all the buffer! */ |
| 547 |
req->header_line = req->header_end = req->buffer; |
| 548 |
} |
| 549 |
|
| 550 |
/* reset req->filepos for logging (it's used in pipe.c) */ |
| 551 |
/* still don't know why req->filesize might be reset though */ |
| 552 |
req->filepos = 0; |
| 553 |
break; |
| 554 |
} |
| 555 |
|
| 556 |
return 1; |
| 557 |
} |
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