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 | ||
341b3f0b | 55 | static void forkchild(int inpath, char *prog, char *file, char *method, char *url, char *rest, int *infd, int *outfd) |
8cc51634 FT |
56 | { |
57 | int i; | |
58 | char *qp, **env; | |
59 | int inp[2], outp[2]; | |
60 | pid_t pid; | |
61 | ||
62 | pipe(inp); | |
63 | pipe(outp); | |
64 | if((pid = fork()) < 0) { | |
65 | flog(LOG_ERR, "callcgi: could not fork"); | |
66 | exit(1); | |
67 | } | |
68 | if(pid == 0) { | |
69 | close(inp[1]); | |
70 | close(outp[0]); | |
71 | dup2(inp[0], 0); | |
72 | dup2(outp[1], 1); | |
73 | for(i = 3; i < FD_SETSIZE; i++) | |
74 | close(i); | |
75 | if((qp = strchr(url, '?')) != NULL) | |
76 | *(qp++) = 0; | |
77 | /* | |
78 | * XXX: Currently missing: | |
79 | * SERVER_NAME (Partially) | |
80 | * SERVER_PORT | |
81 | */ | |
82 | putenv(sprintf2("SERVER_SOFTWARE=ashd/%s", VERSION)); | |
83 | putenv("GATEWAY_INTERFACE=CGI/1.1"); | |
84 | if(getenv("HTTP_VERSION")) | |
85 | putenv(sprintf2("SERVER_PROTOCOL=HTTP/%s", getenv("HTTP_VERSION"))); | |
86 | putenv(sprintf2("REQUEST_METHOD=%s", method)); | |
87 | putenv(sprintf2("PATH_INFO=%s", rest)); | |
88 | putenv(sprintf2("SCRIPT_NAME=%s", url)); | |
89 | putenv(sprintf2("QUERY_STRING=%s", qp?qp:"")); | |
90 | if(getenv("REQ_HOST")) | |
91 | putenv(sprintf2("SERVER_NAME=%s", getenv("REQ_HOST"))); | |
92 | if(getenv("REQ_X_ASH_ADDRESS")) | |
93 | putenv(sprintf2("REMOTE_ADDR=%s", getenv("REQ_X_ASH_ADDRESS"))); | |
94 | if(getenv("REQ_CONTENT_TYPE")) | |
95 | putenv(sprintf2("CONTENT_TYPE=%s", getenv("REQ_CONTENT_TYPE"))); | |
96 | if(getenv("REQ_CONTENT_LENGTH")) | |
97 | putenv(sprintf2("CONTENT_LENGTH=%s", getenv("REQ_CONTENT_LENGTH"))); | |
98 | for(env = environ; *env; env++) { | |
99 | if(!strncmp(*env, "REQ_", 4)) | |
100 | putenv(sprintf2("HTTP_%s", (*env) + 4)); | |
101 | } | |
102 | /* | |
103 | * This is (understandably) missing from the CGI | |
104 | * specification, but PHP seems to require it. | |
105 | */ | |
106 | putenv(sprintf2("SCRIPT_FILENAME=%s", file)); | |
341b3f0b FT |
107 | if(inpath) |
108 | execlp(prog, prog, file, NULL); | |
109 | else | |
110 | execl(prog, prog, file, NULL); | |
8cc51634 FT |
111 | exit(127); |
112 | } | |
113 | close(inp[0]); | |
114 | close(outp[1]); | |
115 | *infd = inp[1]; | |
116 | *outfd = outp[0]; | |
117 | } | |
118 | ||
119 | static void trim(struct charbuf *buf) | |
120 | { | |
121 | char *p; | |
122 | ||
123 | for(p = buf->b; (p - buf->b < buf->d) && isspace(*p); p++); | |
124 | memmove(buf->b, p, buf->d -= (p - buf->b)); | |
125 | for(p = buf->b + buf->d - 1; (p > buf->b) && isspace(*p); p--, buf->d--); | |
126 | } | |
127 | ||
128 | static char **parseheaders(FILE *s) | |
129 | { | |
130 | int c, state; | |
131 | struct charvbuf hbuf; | |
132 | struct charbuf buf; | |
133 | ||
134 | bufinit(hbuf); | |
135 | bufinit(buf); | |
136 | state = 0; | |
137 | while(1) { | |
138 | c = fgetc(s); | |
139 | again: | |
140 | if(state == 0) { | |
141 | if(c == '\r') { | |
142 | } else if(c == '\n') { | |
143 | break; | |
144 | } else if(c == EOF) { | |
145 | goto fail; | |
146 | } else { | |
147 | state = 1; | |
148 | goto again; | |
149 | } | |
150 | } else if(state == 1) { | |
151 | if(c == ':') { | |
152 | trim(&buf); | |
153 | bufadd(buf, 0); | |
154 | bufadd(hbuf, buf.b); | |
155 | bufinit(buf); | |
156 | state = 2; | |
157 | } else if(c == '\r') { | |
158 | } else if(c == '\n') { | |
159 | goto fail; | |
160 | } else if(c == EOF) { | |
161 | goto fail; | |
162 | } else { | |
163 | bufadd(buf, c); | |
164 | } | |
165 | } else if(state == 2) { | |
166 | if(c == '\r') { | |
167 | } else if(c == '\n') { | |
168 | trim(&buf); | |
169 | bufadd(buf, 0); | |
170 | bufadd(hbuf, buf.b); | |
171 | bufinit(buf); | |
172 | state = 0; | |
173 | } else if(c == EOF) { | |
174 | goto fail; | |
175 | } else { | |
176 | bufadd(buf, c); | |
177 | } | |
178 | } | |
179 | } | |
180 | bufadd(hbuf, NULL); | |
181 | return(hbuf.b); | |
182 | ||
183 | fail: | |
184 | buffree(hbuf); | |
185 | buffree(buf); | |
186 | return(NULL); | |
187 | } | |
188 | ||
2e535ab0 FT |
189 | static char *defstatus(int code) |
190 | { | |
191 | if(code == 200) | |
192 | return("OK"); | |
193 | else if(code == 201) | |
194 | return("Created"); | |
195 | else if(code == 202) | |
196 | return("Accepted"); | |
197 | else if(code == 204) | |
198 | return("No Content"); | |
199 | else if(code == 300) | |
200 | return("Multiple Choices"); | |
201 | else if(code == 301) | |
202 | return("Moved Permanently"); | |
203 | else if(code == 302) | |
204 | return("Found"); | |
205 | else if(code == 303) | |
206 | return("See Other"); | |
207 | else if(code == 304) | |
208 | return("Not Modified"); | |
209 | else if(code == 307) | |
210 | return("Moved Temporarily"); | |
211 | else if(code == 400) | |
212 | return("Bad Request"); | |
213 | else if(code == 401) | |
214 | return("Unauthorized"); | |
215 | else if(code == 403) | |
216 | return("Forbidden"); | |
217 | else if(code == 404) | |
218 | return("Not Found"); | |
219 | else if(code == 500) | |
220 | return("Internal Server Error"); | |
221 | else if(code == 501) | |
222 | return("Not Implemented"); | |
223 | else if(code == 503) | |
224 | return("Service Unavailable"); | |
225 | else | |
226 | return("Unknown status"); | |
227 | } | |
228 | ||
8cc51634 FT |
229 | static void sendstatus(char **headers, FILE *out) |
230 | { | |
231 | char **hp; | |
232 | char *status, *location; | |
233 | ||
234 | hp = headers; | |
235 | status = location = NULL; | |
236 | while(*hp) { | |
237 | if(!strcasecmp(hp[0], "status")) { | |
238 | status = hp[1]; | |
239 | /* Clear this header, so that it is not transmitted by sendheaders. */ | |
240 | **hp = 0; | |
241 | } else if(!strcasecmp(hp[0], "location")) { | |
242 | location = hp[1]; | |
f9255ddd | 243 | hp += 2; |
8cc51634 FT |
244 | } else { |
245 | hp += 2; | |
246 | } | |
247 | } | |
248 | if(status) { | |
2e535ab0 FT |
249 | if(strchr(status, ' ')) |
250 | fprintf(out, "HTTP/1.1 %s\r\n", status); | |
251 | else | |
252 | fprintf(out, "HTTP/1.1 %i %s\r\n", atoi(status), defstatus(atoi(status))); | |
8cc51634 FT |
253 | } else if(location) { |
254 | fprintf(out, "HTTP/1.1 303 See Other\r\n"); | |
255 | } else { | |
256 | fprintf(out, "HTTP/1.1 200 OK\r\n"); | |
257 | } | |
258 | } | |
259 | ||
260 | static void sendheaders(char **headers, FILE *out) | |
261 | { | |
262 | while(*headers) { | |
263 | if(**headers) | |
264 | fprintf(out, "%s: %s\r\n", headers[0], headers[1]); | |
265 | headers += 2; | |
266 | } | |
267 | } | |
268 | ||
341b3f0b FT |
269 | static void usage(void) |
270 | { | |
271 | flog(LOG_ERR, "usage: callcgi [-p PROGRAM] METHOD URL REST"); | |
272 | } | |
273 | ||
8cc51634 FT |
274 | int main(int argc, char **argv, char **envp) |
275 | { | |
341b3f0b FT |
276 | int c; |
277 | char *file, *prog; | |
278 | int inpath; | |
279 | int infd, outfd; | |
280 | FILE *in, *out; | |
8cc51634 FT |
281 | char **headers; |
282 | ||
283 | environ = envp; | |
284 | signal(SIGPIPE, SIG_IGN); | |
341b3f0b FT |
285 | |
286 | prog = NULL; | |
287 | inpath = 0; | |
288 | while((c = getopt(argc, argv, "p:")) >= 0) { | |
289 | switch(c) { | |
290 | case 'p': | |
291 | prog = optarg; | |
292 | inpath = 1; | |
293 | break; | |
294 | default: | |
295 | usage(); | |
296 | exit(1); | |
297 | } | |
298 | } | |
299 | ||
300 | if(argc - optind < 3) { | |
301 | usage(); | |
8cc51634 FT |
302 | exit(1); |
303 | } | |
304 | if((file = getenv("REQ_X_ASH_FILE")) == NULL) { | |
305 | flog(LOG_ERR, "callcgi: needs to be called with the X-Ash-File header"); | |
306 | exit(1); | |
307 | } | |
341b3f0b FT |
308 | if(prog == NULL) |
309 | prog = file; | |
310 | forkchild(inpath, prog, file, argv[optind], argv[optind + 1], argv[optind + 2], &infd, &outfd); | |
311 | in = fdopen(infd, "w"); | |
312 | passdata(stdin, in); | |
313 | fclose(in); | |
314 | out = fdopen(outfd, "r"); | |
315 | if((headers = parseheaders(out)) == NULL) { | |
8cc51634 FT |
316 | flog(LOG_WARNING, "CGI handler returned invalid headers"); |
317 | exit(1); | |
318 | } | |
319 | sendstatus(headers, stdout); | |
320 | sendheaders(headers, stdout); | |
321 | printf("\r\n"); | |
341b3f0b | 322 | passdata(out, stdout); |
8cc51634 FT |
323 | return(0); |
324 | } |