Commit | Line | Data |
---|---|---|
8cc51634 FT |
1 | /* |
2 | ashd - A Sane HTTP Daemon | |
3 | Copyright (C) 2008 Fredrik Tolf <fredrik@dolda2000.com> | |
4 | ||
5 | This program is free software: you can redistribute it and/or modify | |
6 | it under the terms of the GNU General Public License as published by | |
7 | the Free Software Foundation, either version 3 of the License, or | |
8 | (at your option) any later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program. If not, see <http://www.gnu.org/licenses/>. | |
17 | */ | |
18 | ||
19 | #include <stdlib.h> | |
20 | #include <string.h> | |
21 | #include <stdio.h> | |
22 | #include <unistd.h> | |
23 | #include <errno.h> | |
24 | #include <ctype.h> | |
25 | #include <signal.h> | |
df96b222 | 26 | #include <sys/poll.h> |
8cc51634 FT |
27 | |
28 | #ifdef HAVE_CONFIG_H | |
29 | #include <config.h> | |
30 | #endif | |
31 | #include <utils.h> | |
32 | #include <log.h> | |
09c82f9c | 33 | #include <req.h> |
8cc51634 FT |
34 | |
35 | static char **environ; | |
36 | ||
df96b222 | 37 | static int passdata(FILE *in, FILE *out) |
8cc51634 FT |
38 | { |
39 | int ret; | |
df96b222 FT |
40 | char buf[65536]; |
41 | struct pollfd pfds[2]; | |
8cc51634 | 42 | |
8cc51634 | 43 | while(!feof(in)) { |
df96b222 FT |
44 | memset(pfds, 0, sizeof(struct pollfd) * 2); |
45 | pfds[0].fd = fileno(in); | |
46 | pfds[0].events = POLLIN; | |
47 | pfds[1].fd = fileno(out); | |
48 | pfds[1].events = POLLHUP; | |
49 | ret = poll(pfds, 2, -1); | |
50 | if(ret < 0) { | |
51 | if(errno != EINTR) { | |
52 | flog(LOG_ERR, "callcgi: error in poll: %s", strerror(errno)); | |
53 | return(1); | |
54 | } | |
8cc51634 | 55 | } |
df96b222 | 56 | if(ret > 0) { |
19409e87 | 57 | if(pfds[0].revents & (POLLIN | POLLERR | POLLHUP)) { |
df96b222 FT |
58 | ret = fread(buf, 1, 65536, in); |
59 | if(ferror(in)) { | |
60 | flog(LOG_ERR, "callcgi: could not read input: %s", strerror(errno)); | |
61 | return(1); | |
62 | } | |
63 | if(fwrite(buf, 1, ret, out) != ret) { | |
64 | flog(LOG_ERR, "callcgi: could not write output: %s", strerror(errno)); | |
65 | return(1); | |
66 | } | |
67 | } | |
68 | if(pfds[1].revents & POLLHUP) | |
69 | return(1); | |
8cc51634 FT |
70 | } |
71 | } | |
df96b222 | 72 | return(0); |
8cc51634 FT |
73 | } |
74 | ||
bac8c1f9 FT |
75 | static char *absolutify(char *file) |
76 | { | |
77 | char cwd[1024]; | |
78 | ||
79 | if(*file != '/') { | |
80 | getcwd(cwd, sizeof(cwd)); | |
81 | return(sprintf2("%s/%s", cwd, file)); | |
82 | } | |
83 | return(sstrdup(file)); | |
84 | } | |
85 | ||
df96b222 | 86 | static pid_t forkchild(int inpath, char *prog, char *file, char *method, char *url, char *rest, int *infd, int *outfd) |
8cc51634 FT |
87 | { |
88 | int i; | |
85059e82 | 89 | char *qp, **env, *name; |
8cc51634 FT |
90 | int inp[2], outp[2]; |
91 | pid_t pid; | |
09c82f9c | 92 | char *unqr; |
8cc51634 FT |
93 | |
94 | pipe(inp); | |
95 | pipe(outp); | |
96 | if((pid = fork()) < 0) { | |
97 | flog(LOG_ERR, "callcgi: could not fork"); | |
98 | exit(1); | |
99 | } | |
100 | if(pid == 0) { | |
101 | close(inp[1]); | |
102 | close(outp[0]); | |
103 | dup2(inp[0], 0); | |
104 | dup2(outp[1], 1); | |
105 | for(i = 3; i < FD_SETSIZE; i++) | |
106 | close(i); | |
107 | if((qp = strchr(url, '?')) != NULL) | |
108 | *(qp++) = 0; | |
8cc51634 FT |
109 | putenv(sprintf2("SERVER_SOFTWARE=ashd/%s", VERSION)); |
110 | putenv("GATEWAY_INTERFACE=CGI/1.1"); | |
111 | if(getenv("HTTP_VERSION")) | |
147c2b51 | 112 | putenv(sprintf2("SERVER_PROTOCOL=%s", getenv("HTTP_VERSION"))); |
8cc51634 | 113 | putenv(sprintf2("REQUEST_METHOD=%s", method)); |
09c82f9c FT |
114 | unqr = unquoteurl(rest); |
115 | putenv(sprintf2("PATH_INFO=%s", unqr?unqr:rest)); | |
85059e82 FT |
116 | name = url; |
117 | /* XXX: This is an ugly hack (I think), but though I can think | |
118 | * of several alternatives, none seem to be better. */ | |
2d65add0 FT |
119 | if(*rest && (strlen(url) >= strlen(rest)) && |
120 | !strcmp(rest, url + strlen(url) - strlen(rest))) { | |
121 | name = sprintf2("%.*s", (int)(strlen(url) - strlen(rest)), url); | |
85059e82 FT |
122 | } |
123 | putenv(sprintf2("SCRIPT_NAME=%s", name)); | |
8cc51634 FT |
124 | putenv(sprintf2("QUERY_STRING=%s", qp?qp:"")); |
125 | if(getenv("REQ_HOST")) | |
126 | putenv(sprintf2("SERVER_NAME=%s", getenv("REQ_HOST"))); | |
8626e489 FT |
127 | if(getenv("REQ_X_ASH_SERVER_PORT")) |
128 | putenv(sprintf2("SERVER_PORT=%s", getenv("REQ_X_ASH_SERVER_PORT"))); | |
129 | if(getenv("REQ_X_ASH_PROTOCOL") && !strcmp(getenv("REQ_X_ASH_PROTOCOL"), "https")) | |
f0a758cc | 130 | putenv("HTTPS=on"); |
8cc51634 FT |
131 | if(getenv("REQ_X_ASH_ADDRESS")) |
132 | putenv(sprintf2("REMOTE_ADDR=%s", getenv("REQ_X_ASH_ADDRESS"))); | |
381f9919 FT |
133 | if(getenv("REQ_X_ASH_REMOTE_USER")) |
134 | putenv(sprintf2("REMOTE_USER=%s", getenv("REQ_X_ASH_REMOTE_USER"))); | |
8cc51634 FT |
135 | if(getenv("REQ_CONTENT_TYPE")) |
136 | putenv(sprintf2("CONTENT_TYPE=%s", getenv("REQ_CONTENT_TYPE"))); | |
137 | if(getenv("REQ_CONTENT_LENGTH")) | |
138 | putenv(sprintf2("CONTENT_LENGTH=%s", getenv("REQ_CONTENT_LENGTH"))); | |
139 | for(env = environ; *env; env++) { | |
140 | if(!strncmp(*env, "REQ_", 4)) | |
141 | putenv(sprintf2("HTTP_%s", (*env) + 4)); | |
142 | } | |
143 | /* | |
144 | * This is (understandably) missing from the CGI | |
145 | * specification, but PHP seems to require it. | |
146 | */ | |
bac8c1f9 | 147 | putenv(sprintf2("SCRIPT_FILENAME=%s", absolutify(file))); |
341b3f0b FT |
148 | if(inpath) |
149 | execlp(prog, prog, file, NULL); | |
150 | else | |
151 | execl(prog, prog, file, NULL); | |
8cc51634 FT |
152 | exit(127); |
153 | } | |
154 | close(inp[0]); | |
155 | close(outp[1]); | |
156 | *infd = inp[1]; | |
157 | *outfd = outp[0]; | |
df96b222 | 158 | return(pid); |
8cc51634 FT |
159 | } |
160 | ||
161 | static void trim(struct charbuf *buf) | |
162 | { | |
163 | char *p; | |
164 | ||
165 | for(p = buf->b; (p - buf->b < buf->d) && isspace(*p); p++); | |
166 | memmove(buf->b, p, buf->d -= (p - buf->b)); | |
167 | for(p = buf->b + buf->d - 1; (p > buf->b) && isspace(*p); p--, buf->d--); | |
168 | } | |
169 | ||
09c82f9c | 170 | static char **parsecgiheaders(FILE *s) |
8cc51634 FT |
171 | { |
172 | int c, state; | |
173 | struct charvbuf hbuf; | |
174 | struct charbuf buf; | |
175 | ||
176 | bufinit(hbuf); | |
177 | bufinit(buf); | |
178 | state = 0; | |
179 | while(1) { | |
180 | c = fgetc(s); | |
181 | again: | |
182 | if(state == 0) { | |
183 | if(c == '\r') { | |
184 | } else if(c == '\n') { | |
185 | break; | |
186 | } else if(c == EOF) { | |
187 | goto fail; | |
188 | } else { | |
189 | state = 1; | |
190 | goto again; | |
191 | } | |
192 | } else if(state == 1) { | |
193 | if(c == ':') { | |
194 | trim(&buf); | |
195 | bufadd(buf, 0); | |
196 | bufadd(hbuf, buf.b); | |
197 | bufinit(buf); | |
198 | state = 2; | |
199 | } else if(c == '\r') { | |
200 | } else if(c == '\n') { | |
201 | goto fail; | |
202 | } else if(c == EOF) { | |
203 | goto fail; | |
204 | } else { | |
205 | bufadd(buf, c); | |
206 | } | |
207 | } else if(state == 2) { | |
208 | if(c == '\r') { | |
209 | } else if(c == '\n') { | |
210 | trim(&buf); | |
211 | bufadd(buf, 0); | |
212 | bufadd(hbuf, buf.b); | |
213 | bufinit(buf); | |
214 | state = 0; | |
215 | } else if(c == EOF) { | |
216 | goto fail; | |
217 | } else { | |
218 | bufadd(buf, c); | |
219 | } | |
220 | } | |
221 | } | |
222 | bufadd(hbuf, NULL); | |
223 | return(hbuf.b); | |
224 | ||
225 | fail: | |
226 | buffree(hbuf); | |
227 | buffree(buf); | |
228 | return(NULL); | |
229 | } | |
230 | ||
2e535ab0 FT |
231 | static char *defstatus(int code) |
232 | { | |
233 | if(code == 200) | |
234 | return("OK"); | |
235 | else if(code == 201) | |
236 | return("Created"); | |
237 | else if(code == 202) | |
238 | return("Accepted"); | |
239 | else if(code == 204) | |
240 | return("No Content"); | |
241 | else if(code == 300) | |
242 | return("Multiple Choices"); | |
243 | else if(code == 301) | |
244 | return("Moved Permanently"); | |
245 | else if(code == 302) | |
246 | return("Found"); | |
247 | else if(code == 303) | |
248 | return("See Other"); | |
249 | else if(code == 304) | |
250 | return("Not Modified"); | |
251 | else if(code == 307) | |
252 | return("Moved Temporarily"); | |
253 | else if(code == 400) | |
254 | return("Bad Request"); | |
255 | else if(code == 401) | |
256 | return("Unauthorized"); | |
257 | else if(code == 403) | |
258 | return("Forbidden"); | |
259 | else if(code == 404) | |
260 | return("Not Found"); | |
261 | else if(code == 500) | |
262 | return("Internal Server Error"); | |
263 | else if(code == 501) | |
264 | return("Not Implemented"); | |
265 | else if(code == 503) | |
266 | return("Service Unavailable"); | |
267 | else | |
268 | return("Unknown status"); | |
269 | } | |
270 | ||
8cc51634 FT |
271 | static void sendstatus(char **headers, FILE *out) |
272 | { | |
273 | char **hp; | |
274 | char *status, *location; | |
275 | ||
276 | hp = headers; | |
277 | status = location = NULL; | |
278 | while(*hp) { | |
279 | if(!strcasecmp(hp[0], "status")) { | |
280 | status = hp[1]; | |
281 | /* Clear this header, so that it is not transmitted by sendheaders. */ | |
282 | **hp = 0; | |
283 | } else if(!strcasecmp(hp[0], "location")) { | |
284 | location = hp[1]; | |
f9255ddd | 285 | hp += 2; |
8cc51634 FT |
286 | } else { |
287 | hp += 2; | |
288 | } | |
289 | } | |
290 | if(status) { | |
2e535ab0 | 291 | if(strchr(status, ' ')) |
81cfca6c | 292 | fprintf(out, "HTTP/1.1 %s\n", status); |
2e535ab0 | 293 | else |
81cfca6c | 294 | fprintf(out, "HTTP/1.1 %i %s\n", atoi(status), defstatus(atoi(status))); |
8cc51634 | 295 | } else if(location) { |
81cfca6c | 296 | fprintf(out, "HTTP/1.1 303 See Other\n"); |
8cc51634 | 297 | } else { |
81cfca6c | 298 | fprintf(out, "HTTP/1.1 200 OK\n"); |
8cc51634 FT |
299 | } |
300 | } | |
301 | ||
302 | static void sendheaders(char **headers, FILE *out) | |
303 | { | |
304 | while(*headers) { | |
305 | if(**headers) | |
81cfca6c | 306 | fprintf(out, "%s: %s\n", headers[0], headers[1]); |
8cc51634 FT |
307 | headers += 2; |
308 | } | |
309 | } | |
310 | ||
341b3f0b FT |
311 | static void usage(void) |
312 | { | |
5e74f3f1 | 313 | flog(LOG_ERR, "usage: callcgi [-c] [-p PROGRAM] METHOD URL REST"); |
341b3f0b FT |
314 | } |
315 | ||
8cc51634 FT |
316 | int main(int argc, char **argv, char **envp) |
317 | { | |
341b3f0b | 318 | int c; |
5e74f3f1 FT |
319 | char *file, *prog, *sp; |
320 | int inpath, cd; | |
341b3f0b FT |
321 | int infd, outfd; |
322 | FILE *in, *out; | |
8cc51634 | 323 | char **headers; |
df96b222 | 324 | pid_t child; |
8cc51634 FT |
325 | |
326 | environ = envp; | |
327 | signal(SIGPIPE, SIG_IGN); | |
341b3f0b FT |
328 | |
329 | prog = NULL; | |
330 | inpath = 0; | |
5e74f3f1 FT |
331 | cd = 0; |
332 | while((c = getopt(argc, argv, "cp:")) >= 0) { | |
341b3f0b | 333 | switch(c) { |
5e74f3f1 FT |
334 | case 'c': |
335 | cd = 1; | |
336 | break; | |
341b3f0b FT |
337 | case 'p': |
338 | prog = optarg; | |
339 | inpath = 1; | |
340 | break; | |
341 | default: | |
342 | usage(); | |
343 | exit(1); | |
344 | } | |
345 | } | |
346 | ||
347 | if(argc - optind < 3) { | |
348 | usage(); | |
8cc51634 FT |
349 | exit(1); |
350 | } | |
351 | if((file = getenv("REQ_X_ASH_FILE")) == NULL) { | |
352 | flog(LOG_ERR, "callcgi: needs to be called with the X-Ash-File header"); | |
353 | exit(1); | |
354 | } | |
5e74f3f1 FT |
355 | |
356 | if(cd) { | |
357 | /* This behavior is encouraged by the CGI specification (RFC 3875, 7.2), | |
358 | * but not strictly required, and I get the feeling it might break some | |
359 | * relative paths here or there, so it's not the default for now. */ | |
360 | if((sp = strrchr(file, '/')) != NULL) { | |
361 | *sp = 0; | |
362 | if(chdir(file)) { | |
363 | *sp = '/'; | |
364 | } else { | |
365 | file = sp + 1; | |
366 | } | |
367 | } | |
368 | } | |
369 | ||
341b3f0b FT |
370 | if(prog == NULL) |
371 | prog = file; | |
df96b222 | 372 | child = forkchild(inpath, prog, file, argv[optind], argv[optind + 1], argv[optind + 2], &infd, &outfd); |
341b3f0b | 373 | in = fdopen(infd, "w"); |
df96b222 | 374 | passdata(stdin, in); /* Ignore errors, perhaps? */ |
341b3f0b FT |
375 | fclose(in); |
376 | out = fdopen(outfd, "r"); | |
09c82f9c | 377 | if((headers = parsecgiheaders(out)) == NULL) { |
8cc51634 FT |
378 | flog(LOG_WARNING, "CGI handler returned invalid headers"); |
379 | exit(1); | |
380 | } | |
381 | sendstatus(headers, stdout); | |
382 | sendheaders(headers, stdout); | |
81cfca6c | 383 | printf("\n"); |
df96b222 FT |
384 | if(passdata(out, stdout)) |
385 | kill(child, SIGINT); | |
8cc51634 FT |
386 | return(0); |
387 | } |