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