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