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)); |
85059e82 FT |
93 | putenv(sprintf2("PATH_INFO=/%s", rest)); |
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. */ | |
97 | if(*rest && (strlen(url) > strlen(rest)) && | |
98 | !strcmp(rest, url + strlen(url) - strlen(rest)) && | |
99 | (url[strlen(url) - strlen(rest) - 1] == '/')) { | |
100 | name = sprintf2("%.*s", (int)(strlen(url) - strlen(rest) - 1), url); | |
101 | } | |
102 | putenv(sprintf2("SCRIPT_NAME=%s", name)); | |
8cc51634 FT |
103 | putenv(sprintf2("QUERY_STRING=%s", qp?qp:"")); |
104 | if(getenv("REQ_HOST")) | |
105 | putenv(sprintf2("SERVER_NAME=%s", getenv("REQ_HOST"))); | |
8626e489 FT |
106 | if(getenv("REQ_X_ASH_SERVER_PORT")) |
107 | putenv(sprintf2("SERVER_PORT=%s", getenv("REQ_X_ASH_SERVER_PORT"))); | |
108 | if(getenv("REQ_X_ASH_PROTOCOL") && !strcmp(getenv("REQ_X_ASH_PROTOCOL"), "https")) | |
f0a758cc | 109 | putenv("HTTPS=on"); |
8cc51634 FT |
110 | if(getenv("REQ_X_ASH_ADDRESS")) |
111 | putenv(sprintf2("REMOTE_ADDR=%s", getenv("REQ_X_ASH_ADDRESS"))); | |
112 | if(getenv("REQ_CONTENT_TYPE")) | |
113 | putenv(sprintf2("CONTENT_TYPE=%s", getenv("REQ_CONTENT_TYPE"))); | |
114 | if(getenv("REQ_CONTENT_LENGTH")) | |
115 | putenv(sprintf2("CONTENT_LENGTH=%s", getenv("REQ_CONTENT_LENGTH"))); | |
116 | for(env = environ; *env; env++) { | |
117 | if(!strncmp(*env, "REQ_", 4)) | |
118 | putenv(sprintf2("HTTP_%s", (*env) + 4)); | |
119 | } | |
120 | /* | |
121 | * This is (understandably) missing from the CGI | |
122 | * specification, but PHP seems to require it. | |
123 | */ | |
bac8c1f9 | 124 | putenv(sprintf2("SCRIPT_FILENAME=%s", absolutify(file))); |
341b3f0b FT |
125 | if(inpath) |
126 | execlp(prog, prog, file, NULL); | |
127 | else | |
128 | execl(prog, prog, file, NULL); | |
8cc51634 FT |
129 | exit(127); |
130 | } | |
131 | close(inp[0]); | |
132 | close(outp[1]); | |
133 | *infd = inp[1]; | |
134 | *outfd = outp[0]; | |
135 | } | |
136 | ||
137 | static void trim(struct charbuf *buf) | |
138 | { | |
139 | char *p; | |
140 | ||
141 | for(p = buf->b; (p - buf->b < buf->d) && isspace(*p); p++); | |
142 | memmove(buf->b, p, buf->d -= (p - buf->b)); | |
143 | for(p = buf->b + buf->d - 1; (p > buf->b) && isspace(*p); p--, buf->d--); | |
144 | } | |
145 | ||
146 | static char **parseheaders(FILE *s) | |
147 | { | |
148 | int c, state; | |
149 | struct charvbuf hbuf; | |
150 | struct charbuf buf; | |
151 | ||
152 | bufinit(hbuf); | |
153 | bufinit(buf); | |
154 | state = 0; | |
155 | while(1) { | |
156 | c = fgetc(s); | |
157 | again: | |
158 | if(state == 0) { | |
159 | if(c == '\r') { | |
160 | } else if(c == '\n') { | |
161 | break; | |
162 | } else if(c == EOF) { | |
163 | goto fail; | |
164 | } else { | |
165 | state = 1; | |
166 | goto again; | |
167 | } | |
168 | } else if(state == 1) { | |
169 | if(c == ':') { | |
170 | trim(&buf); | |
171 | bufadd(buf, 0); | |
172 | bufadd(hbuf, buf.b); | |
173 | bufinit(buf); | |
174 | state = 2; | |
175 | } else if(c == '\r') { | |
176 | } else if(c == '\n') { | |
177 | goto fail; | |
178 | } else if(c == EOF) { | |
179 | goto fail; | |
180 | } else { | |
181 | bufadd(buf, c); | |
182 | } | |
183 | } else if(state == 2) { | |
184 | if(c == '\r') { | |
185 | } else if(c == '\n') { | |
186 | trim(&buf); | |
187 | bufadd(buf, 0); | |
188 | bufadd(hbuf, buf.b); | |
189 | bufinit(buf); | |
190 | state = 0; | |
191 | } else if(c == EOF) { | |
192 | goto fail; | |
193 | } else { | |
194 | bufadd(buf, c); | |
195 | } | |
196 | } | |
197 | } | |
198 | bufadd(hbuf, NULL); | |
199 | return(hbuf.b); | |
200 | ||
201 | fail: | |
202 | buffree(hbuf); | |
203 | buffree(buf); | |
204 | return(NULL); | |
205 | } | |
206 | ||
2e535ab0 FT |
207 | static char *defstatus(int code) |
208 | { | |
209 | if(code == 200) | |
210 | return("OK"); | |
211 | else if(code == 201) | |
212 | return("Created"); | |
213 | else if(code == 202) | |
214 | return("Accepted"); | |
215 | else if(code == 204) | |
216 | return("No Content"); | |
217 | else if(code == 300) | |
218 | return("Multiple Choices"); | |
219 | else if(code == 301) | |
220 | return("Moved Permanently"); | |
221 | else if(code == 302) | |
222 | return("Found"); | |
223 | else if(code == 303) | |
224 | return("See Other"); | |
225 | else if(code == 304) | |
226 | return("Not Modified"); | |
227 | else if(code == 307) | |
228 | return("Moved Temporarily"); | |
229 | else if(code == 400) | |
230 | return("Bad Request"); | |
231 | else if(code == 401) | |
232 | return("Unauthorized"); | |
233 | else if(code == 403) | |
234 | return("Forbidden"); | |
235 | else if(code == 404) | |
236 | return("Not Found"); | |
237 | else if(code == 500) | |
238 | return("Internal Server Error"); | |
239 | else if(code == 501) | |
240 | return("Not Implemented"); | |
241 | else if(code == 503) | |
242 | return("Service Unavailable"); | |
243 | else | |
244 | return("Unknown status"); | |
245 | } | |
246 | ||
8cc51634 FT |
247 | static void sendstatus(char **headers, FILE *out) |
248 | { | |
249 | char **hp; | |
250 | char *status, *location; | |
251 | ||
252 | hp = headers; | |
253 | status = location = NULL; | |
254 | while(*hp) { | |
255 | if(!strcasecmp(hp[0], "status")) { | |
256 | status = hp[1]; | |
257 | /* Clear this header, so that it is not transmitted by sendheaders. */ | |
258 | **hp = 0; | |
259 | } else if(!strcasecmp(hp[0], "location")) { | |
260 | location = hp[1]; | |
f9255ddd | 261 | hp += 2; |
8cc51634 FT |
262 | } else { |
263 | hp += 2; | |
264 | } | |
265 | } | |
266 | if(status) { | |
2e535ab0 | 267 | if(strchr(status, ' ')) |
81cfca6c | 268 | fprintf(out, "HTTP/1.1 %s\n", status); |
2e535ab0 | 269 | else |
81cfca6c | 270 | fprintf(out, "HTTP/1.1 %i %s\n", atoi(status), defstatus(atoi(status))); |
8cc51634 | 271 | } else if(location) { |
81cfca6c | 272 | fprintf(out, "HTTP/1.1 303 See Other\n"); |
8cc51634 | 273 | } else { |
81cfca6c | 274 | fprintf(out, "HTTP/1.1 200 OK\n"); |
8cc51634 FT |
275 | } |
276 | } | |
277 | ||
278 | static void sendheaders(char **headers, FILE *out) | |
279 | { | |
280 | while(*headers) { | |
281 | if(**headers) | |
81cfca6c | 282 | fprintf(out, "%s: %s\n", headers[0], headers[1]); |
8cc51634 FT |
283 | headers += 2; |
284 | } | |
285 | } | |
286 | ||
341b3f0b FT |
287 | static void usage(void) |
288 | { | |
289 | flog(LOG_ERR, "usage: callcgi [-p PROGRAM] METHOD URL REST"); | |
290 | } | |
291 | ||
8cc51634 FT |
292 | int main(int argc, char **argv, char **envp) |
293 | { | |
341b3f0b FT |
294 | int c; |
295 | char *file, *prog; | |
296 | int inpath; | |
297 | int infd, outfd; | |
298 | FILE *in, *out; | |
8cc51634 FT |
299 | char **headers; |
300 | ||
301 | environ = envp; | |
302 | signal(SIGPIPE, SIG_IGN); | |
341b3f0b FT |
303 | |
304 | prog = NULL; | |
305 | inpath = 0; | |
306 | while((c = getopt(argc, argv, "p:")) >= 0) { | |
307 | switch(c) { | |
308 | case 'p': | |
309 | prog = optarg; | |
310 | inpath = 1; | |
311 | break; | |
312 | default: | |
313 | usage(); | |
314 | exit(1); | |
315 | } | |
316 | } | |
317 | ||
318 | if(argc - optind < 3) { | |
319 | usage(); | |
8cc51634 FT |
320 | exit(1); |
321 | } | |
322 | if((file = getenv("REQ_X_ASH_FILE")) == NULL) { | |
323 | flog(LOG_ERR, "callcgi: needs to be called with the X-Ash-File header"); | |
324 | exit(1); | |
325 | } | |
341b3f0b FT |
326 | if(prog == NULL) |
327 | prog = file; | |
328 | forkchild(inpath, prog, file, argv[optind], argv[optind + 1], argv[optind + 2], &infd, &outfd); | |
329 | in = fdopen(infd, "w"); | |
330 | passdata(stdin, in); | |
331 | fclose(in); | |
332 | out = fdopen(outfd, "r"); | |
333 | if((headers = parseheaders(out)) == NULL) { | |
8cc51634 FT |
334 | flog(LOG_WARNING, "CGI handler returned invalid headers"); |
335 | exit(1); | |
336 | } | |
337 | sendstatus(headers, stdout); | |
338 | sendheaders(headers, stdout); | |
81cfca6c | 339 | printf("\n"); |
341b3f0b | 340 | passdata(out, stdout); |
8cc51634 FT |
341 | return(0); |
342 | } |