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