Commit | Line | Data |
---|---|---|
600a1ce7 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 <stdio.h> | |
21 | #include <string.h> | |
22 | #include <unistd.h> | |
23 | #include <errno.h> | |
24 | #include <sys/stat.h> | |
25 | #include <ctype.h> | |
26 | #include <dirent.h> | |
27 | #include <time.h> | |
578ad6b1 | 28 | #include <sys/wait.h> |
600a1ce7 FT |
29 | #include <sys/signal.h> |
30 | ||
31 | #ifdef HAVE_CONFIG_H | |
32 | #include <config.h> | |
33 | #endif | |
34 | #include <utils.h> | |
35 | #include <log.h> | |
36 | #include <req.h> | |
37 | #include <proc.h> | |
38 | #include <resp.h> | |
39 | #include <cf.h> | |
40 | ||
41 | #include "dirplex.h" | |
42 | ||
43 | time_t now; | |
44 | ||
da75c835 FT |
45 | static void chinit(void *idata) |
46 | { | |
47 | char *twd = idata; | |
48 | ||
49 | if(twd != NULL) { | |
50 | /* This should never be able to fail other than for critical | |
51 | * I/O errors or some such, since the path has already been | |
52 | * traversed. */ | |
53 | if(chdir(twd)) | |
54 | exit(127); | |
55 | } | |
56 | } | |
57 | ||
600a1ce7 FT |
58 | static void handle(struct hthead *req, int fd, char *path, struct pattern *pat) |
59 | { | |
60 | struct child *ch; | |
da75c835 | 61 | struct config *ccf; |
acc2d159 | 62 | struct headmod *head; |
da75c835 | 63 | char *twd; |
600a1ce7 | 64 | |
acc2d159 FT |
65 | for(head = pat->headers; head != NULL; head = head->next) { |
66 | headrmheader(req, head->name); | |
67 | headappheader(req, head->name, head->value); | |
68 | } | |
2a249e82 | 69 | if(!strncmp(path, "./", 2) && path[2]) |
cf6e7461 | 70 | path += 2; |
600a1ce7 | 71 | if(pat->fchild) { |
da75c835 | 72 | headappheader(req, "X-Ash-File", path); |
6a7a868e | 73 | stdforkserve(pat->fchild, req, fd, NULL, NULL); |
600a1ce7 | 74 | } else { |
da75c835 | 75 | if((ch = findchild(path, pat->childnm, &ccf)) == NULL) { |
600a1ce7 FT |
76 | flog(LOG_ERR, "child %s requested, but was not declared", pat->childnm); |
77 | simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", pat->childnm); | |
78 | return; | |
79 | } | |
b70b2d4f | 80 | if((twd = ccf?ccf->path:NULL) != NULL) { |
da75c835 FT |
81 | if(!strcmp(twd, ".")) { |
82 | twd = NULL; | |
83 | } else if(strncmp(path, twd, strlen(twd)) || (path[strlen(twd)] != '/')) { | |
84 | /* Should be an impossible case under the current (and | |
85 | * foreseeable) scheme. */ | |
86 | simpleerror(fd, 500, "Server Error", "An internal server error occurred."); | |
87 | return; | |
88 | } else { | |
89 | path = path + strlen(twd) + 1; | |
90 | } | |
91 | } | |
92 | headappheader(req, "X-Ash-File", path); | |
93 | if(childhandle(ch, req, fd, chinit, twd)) | |
600a1ce7 FT |
94 | simpleerror(fd, 500, "Server Error", "The request handler crashed."); |
95 | } | |
96 | } | |
97 | ||
b70b2d4f FT |
98 | static void handle404(struct hthead *req, int fd, char *path) |
99 | { | |
100 | struct child *ch; | |
101 | struct config *ccf; | |
102 | char *tmp; | |
103 | ||
104 | tmp = sstrdup(path); | |
105 | ch = findchild(tmp, ".notfound", &ccf); | |
106 | if(childhandle(ch, req, fd, chinit, ccf?ccf->path:NULL)) | |
107 | simpleerror(fd, 500, "Server Error", "The request handler crashed."); | |
108 | free(tmp); | |
109 | } | |
110 | ||
600a1ce7 FT |
111 | static void handlefile(struct hthead *req, int fd, char *path) |
112 | { | |
113 | struct pattern *pat; | |
114 | ||
115 | if((pat = findmatch(path, 0, 0)) == NULL) { | |
b70b2d4f | 116 | handle404(req, fd, path); |
600a1ce7 FT |
117 | return; |
118 | } | |
119 | handle(req, fd, path, pat); | |
120 | } | |
121 | ||
122 | static char *findfile(char *path, char *name, struct stat *sb) | |
123 | { | |
124 | DIR *dir; | |
125 | struct stat sbuf; | |
126 | struct dirent *dent; | |
127 | char *p, *fp, *ret; | |
128 | ||
129 | if(sb == NULL) | |
130 | sb = &sbuf; | |
131 | if((dir = opendir(path)) == NULL) | |
132 | return(NULL); | |
133 | ret = NULL; | |
134 | while((dent = readdir(dir)) != NULL) { | |
135 | /* Ignore backup files. | |
136 | * XXX: There is probably a better and more extensible way to | |
137 | * do this. */ | |
138 | if(dent->d_name[strlen(dent->d_name) - 1] == '~') | |
139 | continue; | |
140 | if((p = strchr(dent->d_name, '.')) == NULL) | |
141 | continue; | |
142 | if(p - dent->d_name != strlen(name)) | |
143 | continue; | |
144 | if(strncmp(dent->d_name, name, strlen(name))) | |
145 | continue; | |
146 | fp = sprintf3("%s/%s", path, dent->d_name); | |
147 | if(stat(fp, sb)) | |
148 | continue; | |
149 | if(!S_ISREG(sb->st_mode)) | |
150 | continue; | |
151 | ret = sstrdup(fp); | |
152 | break; | |
153 | } | |
154 | closedir(dir); | |
155 | return(ret); | |
156 | } | |
157 | ||
158 | static void handledir(struct hthead *req, int fd, char *path) | |
159 | { | |
160 | struct config **cfs; | |
161 | int i, o; | |
162 | struct stat sb; | |
163 | char *inm, *ipath, *cpath; | |
164 | struct pattern *pat; | |
165 | ||
166 | cpath = sprintf2("%s/", path); | |
167 | cfs = getconfigs(cpath); | |
168 | for(i = 0; cfs[i] != NULL; i++) { | |
169 | if(cfs[i]->index != NULL) { | |
170 | for(o = 0; cfs[i]->index[o] != NULL; o++) { | |
171 | inm = cfs[i]->index[o]; | |
172 | ipath = sprintf2("%s/%s", path, inm); | |
173 | if(!stat(ipath, &sb) && S_ISREG(sb.st_mode)) { | |
174 | handlefile(req, fd, ipath); | |
175 | free(ipath); | |
176 | goto out; | |
177 | } | |
178 | free(ipath); | |
179 | ||
180 | if(!strchr(inm, '.') && ((ipath = findfile(path, inm, NULL)) != NULL)) { | |
181 | handlefile(req, fd, ipath); | |
182 | free(ipath); | |
183 | goto out; | |
184 | } | |
185 | } | |
186 | break; | |
187 | } | |
188 | } | |
189 | if((pat = findmatch(cpath, 0, 1)) != NULL) { | |
190 | handle(req, fd, cpath, pat); | |
191 | goto out; | |
192 | } | |
193 | simpleerror(fd, 403, "Not Authorized", "Will not send listings for this directory."); | |
194 | ||
195 | out: | |
196 | free(cpath); | |
197 | } | |
198 | ||
199 | static int checkpath(struct hthead *req, int fd, char *path, char *rest); | |
200 | ||
201 | static int checkentry(struct hthead *req, int fd, char *path, char *rest, char *el) | |
202 | { | |
203 | struct stat sb; | |
204 | char *newpath; | |
205 | int rv; | |
206 | ||
c6cb01ef | 207 | if(*el == '.') { |
b70b2d4f | 208 | handle404(req, fd, sprintf3("%s/", path)); |
600a1ce7 FT |
209 | return(1); |
210 | } | |
211 | if(!stat(sprintf3("%s/%s", path, el), &sb)) { | |
212 | if(S_ISDIR(sb.st_mode)) { | |
213 | if(!*rest) { | |
214 | stdredir(req, fd, 301, sprintf3("%s/", el)); | |
215 | return(1); | |
216 | } | |
217 | newpath = sprintf2("%s/%s", path, el); | |
218 | rv = checkpath(req, fd, newpath, rest + 1); | |
219 | free(newpath); | |
220 | return(rv); | |
221 | } else if(S_ISREG(sb.st_mode)) { | |
222 | newpath = sprintf2("%s/%s", path, el); | |
223 | replrest(req, rest); | |
224 | handlefile(req, fd, newpath); | |
225 | free(newpath); | |
226 | return(1); | |
227 | } | |
b70b2d4f | 228 | handle404(req, fd, sprintf3("%s/", path)); |
600a1ce7 FT |
229 | return(1); |
230 | } | |
231 | if(!strchr(el, '.') && ((newpath = findfile(path, el, NULL)) != NULL)) { | |
232 | replrest(req, rest); | |
233 | handlefile(req, fd, newpath); | |
234 | free(newpath); | |
235 | return(1); | |
236 | } | |
237 | return(0); | |
238 | } | |
239 | ||
300d73d9 FT |
240 | static int checkdir(struct hthead *req, int fd, char *path, char *rest) |
241 | { | |
242 | char *cpath; | |
243 | struct config *cf, *ccf; | |
244 | struct child *ch; | |
245 | ||
246 | cf = getconfig(path); | |
54490135 | 247 | if((cf->capture != NULL) && (cf->caproot || !cf->path || strcmp(cf->path, "."))) { |
300d73d9 FT |
248 | cpath = sprintf2("%s/", path); |
249 | if((ch = findchild(cpath, cf->capture, &ccf)) == NULL) { | |
250 | free(cpath); | |
251 | flog(LOG_ERR, "child %s requested for capture, but was not declared", cf->capture); | |
252 | simpleerror(fd, 500, "Configuration Error", "The server is erroneously configured. Handler %s was requested, but not declared.", cf->capture); | |
253 | return(1); | |
254 | } | |
255 | free(cpath); | |
256 | if(*rest == '/') | |
257 | rest++; | |
258 | replrest(req, rest); | |
b70b2d4f | 259 | if(childhandle(ch, req, fd, chinit, ccf?ccf->path:NULL)) |
300d73d9 FT |
260 | simpleerror(fd, 500, "Server Error", "The request handler crashed."); |
261 | return(1); | |
262 | } | |
263 | return(0); | |
264 | } | |
265 | ||
600a1ce7 FT |
266 | static int checkpath(struct hthead *req, int fd, char *path, char *rest) |
267 | { | |
600a1ce7 FT |
268 | char *p, *el; |
269 | int rv; | |
270 | ||
271 | el = NULL; | |
272 | rv = 0; | |
273 | ||
274 | if(!strncmp(path, "./", 2)) | |
275 | path += 2; | |
300d73d9 FT |
276 | if(checkdir(req, fd, path, rest)) |
277 | return(1); | |
600a1ce7 FT |
278 | |
279 | if((p = strchr(rest, '/')) == NULL) { | |
280 | el = unquoteurl(rest); | |
281 | rest = ""; | |
282 | } else { | |
283 | char buf[p - rest + 1]; | |
284 | memcpy(buf, rest, p - rest); | |
285 | buf[p - rest] = 0; | |
286 | el = unquoteurl(buf); | |
287 | rest = p; | |
288 | } | |
289 | if(el == NULL) { | |
290 | simpleerror(fd, 400, "Bad Request", "The requested URL contains an invalid escape sequence."); | |
291 | rv = 1; | |
292 | goto out; | |
293 | } | |
294 | if(strchr(el, '/') || (!*el && *rest)) { | |
b70b2d4f | 295 | handle404(req, fd, sprintf3("%s/", path)); |
600a1ce7 FT |
296 | rv = 1; |
297 | goto out; | |
298 | } | |
299 | if(!*el) { | |
300 | replrest(req, rest); | |
301 | handledir(req, fd, path); | |
240d9bcd FT |
302 | rv = 1; |
303 | goto out; | |
600a1ce7 FT |
304 | } |
305 | rv = checkentry(req, fd, path, rest, el); | |
306 | ||
307 | out: | |
308 | if(el != NULL) | |
309 | free(el); | |
310 | return(rv); | |
311 | } | |
312 | ||
313 | static void serve(struct hthead *req, int fd) | |
314 | { | |
315 | now = time(NULL); | |
316 | if(!checkpath(req, fd, ".", req->rest)) | |
b70b2d4f | 317 | handle404(req, fd, "."); |
600a1ce7 FT |
318 | } |
319 | ||
578ad6b1 FT |
320 | static void chldhandler(int sig) |
321 | { | |
322 | pid_t pid; | |
3d6044ab | 323 | int st; |
578ad6b1 | 324 | |
3d6044ab FT |
325 | while((pid = waitpid(-1, &st, WNOHANG)) > 0) { |
326 | if(WCOREDUMP(st)) | |
327 | flog(LOG_WARNING, "child process %i dumped core", pid); | |
328 | } | |
578ad6b1 FT |
329 | } |
330 | ||
fd735432 FT |
331 | static void sighandler(int sig) |
332 | { | |
333 | } | |
334 | ||
600a1ce7 FT |
335 | static void usage(FILE *out) |
336 | { | |
337 | fprintf(out, "usage: dirplex [-hN] [-c CONFIG] DIR\n"); | |
338 | } | |
339 | ||
340 | int main(int argc, char **argv) | |
341 | { | |
342 | int c; | |
343 | int nodef; | |
344 | char *gcf, *lcf, *clcf; | |
345 | struct hthead *req; | |
346 | int fd; | |
347 | ||
348 | nodef = 0; | |
349 | lcf = NULL; | |
350 | while((c = getopt(argc, argv, "hNc:")) >= 0) { | |
351 | switch(c) { | |
352 | case 'h': | |
353 | usage(stdout); | |
354 | exit(0); | |
355 | case 'N': | |
356 | nodef = 1; | |
357 | break; | |
358 | case 'c': | |
359 | lcf = optarg; | |
360 | break; | |
361 | default: | |
362 | usage(stderr); | |
363 | exit(1); | |
364 | } | |
365 | } | |
366 | if(argc - optind < 1) { | |
367 | usage(stderr); | |
368 | exit(1); | |
369 | } | |
370 | if(!nodef) { | |
371 | if((gcf = findstdconf("ashd/dirplex.rc")) != NULL) { | |
372 | gconfig = readconfig(gcf); | |
373 | free(gcf); | |
374 | } | |
375 | } | |
376 | if(lcf != NULL) { | |
377 | if(strchr(lcf, '/') == NULL) { | |
378 | if((clcf = findstdconf(sprintf3("ashd/%s", lcf))) == NULL) { | |
379 | flog(LOG_ERR, "could not find requested configuration `%s'", lcf); | |
380 | exit(1); | |
381 | } | |
382 | if((lconfig = readconfig(clcf)) == NULL) | |
383 | exit(1); | |
384 | free(clcf); | |
385 | } else { | |
386 | if((lconfig = readconfig(lcf)) == NULL) | |
387 | exit(1); | |
388 | } | |
389 | } | |
390 | if(chdir(argv[optind])) { | |
391 | flog(LOG_ERR, "could not change directory to %s: %s", argv[optind], strerror(errno)); | |
392 | exit(1); | |
393 | } | |
578ad6b1 | 394 | signal(SIGCHLD, chldhandler); |
fd735432 | 395 | signal(SIGPIPE, sighandler); |
600a1ce7 FT |
396 | while(1) { |
397 | if((fd = recvreq(0, &req)) < 0) { | |
398 | if(errno != 0) | |
399 | flog(LOG_ERR, "recvreq: %s", strerror(errno)); | |
400 | break; | |
401 | } | |
402 | serve(req, fd); | |
403 | freehthead(req); | |
404 | close(fd); | |
405 | } | |
406 | return(0); | |
407 | } |