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1 /* cgit.c: cgi for the git scm
2  *
3  * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
4  *
5  * Licensed under GNU General Public License v2
6  *   (see COPYING for full license text)
7  */
8
9 #include "cgit.h"
10 #include "cache.h"
11 #include "cmd.h"
12 #include "configfile.h"
13 #include "html.h"
14 #include "ui-shared.h"
15 #include "ui-stats.h"
16 #include "ui-blob.h"
17 #include "ui-summary.h"
18 #include "scan-tree.h"
19
20 const char *cgit_version = CGIT_VERSION;
21
22 __attribute__((constructor))
23 static void constructor_environment()
24 {
25         /* Do not look in /etc/ for gitconfig and gitattributes. */
26         setenv("GIT_CONFIG_NOSYSTEM", "1", 1);
27         setenv("GIT_ATTR_NOSYSTEM", "1", 1);
28         unsetenv("HOME");
29         unsetenv("XDG_CONFIG_HOME");
30 }
31
32 static void add_mimetype(const char *name, const char *value)
33 {
34         struct string_list_item *item;
35
36         item = string_list_insert(&ctx.cfg.mimetypes, name);
37         item->util = xstrdup(value);
38 }
39
40 static void process_cached_repolist(const char *path);
41
42 static void repo_config(struct cgit_repo *repo, const char *name, const char *value)
43 {
44         const char *path;
45         struct string_list_item *item;
46
47         if (!strcmp(name, "name"))
48                 repo->name = xstrdup(value);
49         else if (!strcmp(name, "clone-url"))
50                 repo->clone_url = xstrdup(value);
51         else if (!strcmp(name, "desc"))
52                 repo->desc = xstrdup(value);
53         else if (!strcmp(name, "owner"))
54                 repo->owner = xstrdup(value);
55         else if (!strcmp(name, "homepage"))
56                 repo->homepage = xstrdup(value);
57         else if (!strcmp(name, "defbranch"))
58                 repo->defbranch = xstrdup(value);
59         else if (!strcmp(name, "extra-head-content"))
60                 repo->extra_head_content = xstrdup(value);
61         else if (!strcmp(name, "snapshots"))
62                 repo->snapshots = ctx.cfg.snapshots & cgit_parse_snapshots_mask(value);
63         else if (!strcmp(name, "enable-blame"))
64                 repo->enable_blame = atoi(value);
65         else if (!strcmp(name, "enable-commit-graph"))
66                 repo->enable_commit_graph = atoi(value);
67         else if (!strcmp(name, "enable-log-filecount"))
68                 repo->enable_log_filecount = atoi(value);
69         else if (!strcmp(name, "enable-log-linecount"))
70                 repo->enable_log_linecount = atoi(value);
71         else if (!strcmp(name, "enable-remote-branches"))
72                 repo->enable_remote_branches = atoi(value);
73         else if (!strcmp(name, "enable-subject-links"))
74                 repo->enable_subject_links = atoi(value);
75         else if (!strcmp(name, "enable-html-serving"))
76                 repo->enable_html_serving = atoi(value);
77         else if (!strcmp(name, "branch-sort")) {
78                 if (!strcmp(value, "age"))
79                         repo->branch_sort = 1;
80                 if (!strcmp(value, "name"))
81                         repo->branch_sort = 0;
82         } else if (!strcmp(name, "commit-sort")) {
83                 if (!strcmp(value, "date"))
84                         repo->commit_sort = 1;
85                 if (!strcmp(value, "topo"))
86                         repo->commit_sort = 2;
87         } else if (!strcmp(name, "max-stats"))
88                 repo->max_stats = cgit_find_stats_period(value, NULL);
89         else if (!strcmp(name, "module-link"))
90                 repo->module_link= xstrdup(value);
91         else if (skip_prefix(name, "module-link.", &path)) {
92                 item = string_list_append(&repo->submodules, xstrdup(path));
93                 item->util = xstrdup(value);
94         } else if (!strcmp(name, "section"))
95                 repo->section = xstrdup(value);
96         else if (!strcmp(name, "snapshot-prefix"))
97                 repo->snapshot_prefix = xstrdup(value);
98         else if (!strcmp(name, "readme") && value != NULL) {
99                 if (repo->readme.items == ctx.cfg.readme.items)
100                         memset(&repo->readme, 0, sizeof(repo->readme));
101                 string_list_append(&repo->readme, xstrdup(value));
102         } else if (!strcmp(name, "logo") && value != NULL)
103                 repo->logo = xstrdup(value);
104         else if (!strcmp(name, "logo-link") && value != NULL)
105                 repo->logo_link = xstrdup(value);
106         else if (!strcmp(name, "hide"))
107                 repo->hide = atoi(value);
108         else if (!strcmp(name, "ignore"))
109                 repo->ignore = atoi(value);
110         else if (ctx.cfg.enable_filter_overrides) {
111                 if (!strcmp(name, "about-filter"))
112                         repo->about_filter = cgit_new_filter(value, ABOUT);
113                 else if (!strcmp(name, "commit-filter"))
114                         repo->commit_filter = cgit_new_filter(value, COMMIT);
115                 else if (!strcmp(name, "source-filter"))
116                         repo->source_filter = cgit_new_filter(value, SOURCE);
117                 else if (!strcmp(name, "email-filter"))
118                         repo->email_filter = cgit_new_filter(value, EMAIL);
119                 else if (!strcmp(name, "owner-filter"))
120                         repo->owner_filter = cgit_new_filter(value, OWNER);
121         }
122 }
123
124 static void config_cb(const char *name, const char *value)
125 {
126         const char *arg;
127
128         if (!strcmp(name, "section"))
129                 ctx.cfg.section = xstrdup(value);
130         else if (!strcmp(name, "repo.url"))
131                 ctx.repo = cgit_add_repo(value);
132         else if (ctx.repo && !strcmp(name, "repo.path"))
133                 ctx.repo->path = trim_end(value, '/');
134         else if (ctx.repo && skip_prefix(name, "repo.", &arg))
135                 repo_config(ctx.repo, arg, value);
136         else if (!strcmp(name, "readme"))
137                 string_list_append(&ctx.cfg.readme, xstrdup(value));
138         else if (!strcmp(name, "root-title"))
139                 ctx.cfg.root_title = xstrdup(value);
140         else if (!strcmp(name, "root-desc"))
141                 ctx.cfg.root_desc = xstrdup(value);
142         else if (!strcmp(name, "root-readme"))
143                 ctx.cfg.root_readme = xstrdup(value);
144         else if (!strcmp(name, "css"))
145                 string_list_append(&ctx.cfg.css, xstrdup(value));
146         else if (!strcmp(name, "favicon"))
147                 ctx.cfg.favicon = xstrdup(value);
148         else if (!strcmp(name, "footer"))
149                 ctx.cfg.footer = xstrdup(value);
150         else if (!strcmp(name, "head-include"))
151                 ctx.cfg.head_include = xstrdup(value);
152         else if (!strcmp(name, "header"))
153                 ctx.cfg.header = xstrdup(value);
154         else if (!strcmp(name, "logo"))
155                 ctx.cfg.logo = xstrdup(value);
156         else if (!strcmp(name, "logo-link"))
157                 ctx.cfg.logo_link = xstrdup(value);
158         else if (!strcmp(name, "module-link"))
159                 ctx.cfg.module_link = xstrdup(value);
160         else if (!strcmp(name, "strict-export"))
161                 ctx.cfg.strict_export = xstrdup(value);
162         else if (!strcmp(name, "virtual-root"))
163                 ctx.cfg.virtual_root = ensure_end(value, '/');
164         else if (!strcmp(name, "noplainemail"))
165                 ctx.cfg.noplainemail = atoi(value);
166         else if (!strcmp(name, "noheader"))
167                 ctx.cfg.noheader = atoi(value);
168         else if (!strcmp(name, "snapshots"))
169                 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
170         else if (!strcmp(name, "enable-filter-overrides"))
171                 ctx.cfg.enable_filter_overrides = atoi(value);
172         else if (!strcmp(name, "enable-follow-links"))
173                 ctx.cfg.enable_follow_links = atoi(value);
174         else if (!strcmp(name, "enable-http-clone"))
175                 ctx.cfg.enable_http_clone = atoi(value);
176         else if (!strcmp(name, "enable-index-links"))
177                 ctx.cfg.enable_index_links = atoi(value);
178         else if (!strcmp(name, "enable-index-owner"))
179                 ctx.cfg.enable_index_owner = atoi(value);
180         else if (!strcmp(name, "enable-blame"))
181                 ctx.cfg.enable_blame = atoi(value);
182         else if (!strcmp(name, "enable-commit-graph"))
183                 ctx.cfg.enable_commit_graph = atoi(value);
184         else if (!strcmp(name, "enable-log-filecount"))
185                 ctx.cfg.enable_log_filecount = atoi(value);
186         else if (!strcmp(name, "enable-log-linecount"))
187                 ctx.cfg.enable_log_linecount = atoi(value);
188         else if (!strcmp(name, "enable-remote-branches"))
189                 ctx.cfg.enable_remote_branches = atoi(value);
190         else if (!strcmp(name, "enable-subject-links"))
191                 ctx.cfg.enable_subject_links = atoi(value);
192         else if (!strcmp(name, "enable-html-serving"))
193                 ctx.cfg.enable_html_serving = atoi(value);
194         else if (!strcmp(name, "enable-tree-linenumbers"))
195                 ctx.cfg.enable_tree_linenumbers = atoi(value);
196         else if (!strcmp(name, "enable-git-config"))
197                 ctx.cfg.enable_git_config = atoi(value);
198         else if (!strcmp(name, "max-stats"))
199                 ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
200         else if (!strcmp(name, "cache-size"))
201                 ctx.cfg.cache_size = atoi(value);
202         else if (!strcmp(name, "cache-root"))
203                 ctx.cfg.cache_root = xstrdup(expand_macros(value));
204         else if (!strcmp(name, "cache-root-ttl"))
205                 ctx.cfg.cache_root_ttl = atoi(value);
206         else if (!strcmp(name, "cache-repo-ttl"))
207                 ctx.cfg.cache_repo_ttl = atoi(value);
208         else if (!strcmp(name, "cache-scanrc-ttl"))
209                 ctx.cfg.cache_scanrc_ttl = atoi(value);
210         else if (!strcmp(name, "cache-static-ttl"))
211                 ctx.cfg.cache_static_ttl = atoi(value);
212         else if (!strcmp(name, "cache-dynamic-ttl"))
213                 ctx.cfg.cache_dynamic_ttl = atoi(value);
214         else if (!strcmp(name, "cache-about-ttl"))
215                 ctx.cfg.cache_about_ttl = atoi(value);
216         else if (!strcmp(name, "cache-snapshot-ttl"))
217                 ctx.cfg.cache_snapshot_ttl = atoi(value);
218         else if (!strcmp(name, "case-sensitive-sort"))
219                 ctx.cfg.case_sensitive_sort = atoi(value);
220         else if (!strcmp(name, "about-filter"))
221                 ctx.cfg.about_filter = cgit_new_filter(value, ABOUT);
222         else if (!strcmp(name, "commit-filter"))
223                 ctx.cfg.commit_filter = cgit_new_filter(value, COMMIT);
224         else if (!strcmp(name, "email-filter"))
225                 ctx.cfg.email_filter = cgit_new_filter(value, EMAIL);
226         else if (!strcmp(name, "owner-filter"))
227                 ctx.cfg.owner_filter = cgit_new_filter(value, OWNER);
228         else if (!strcmp(name, "auth-filter"))
229                 ctx.cfg.auth_filter = cgit_new_filter(value, AUTH);
230         else if (!strcmp(name, "embedded"))
231                 ctx.cfg.embedded = atoi(value);
232         else if (!strcmp(name, "max-atom-items"))
233                 ctx.cfg.max_atom_items = atoi(value);
234         else if (!strcmp(name, "max-message-length"))
235                 ctx.cfg.max_msg_len = atoi(value);
236         else if (!strcmp(name, "max-repodesc-length"))
237                 ctx.cfg.max_repodesc_len = atoi(value);
238         else if (!strcmp(name, "max-blob-size"))
239                 ctx.cfg.max_blob_size = atoi(value);
240         else if (!strcmp(name, "max-repo-count")) {
241                 ctx.cfg.max_repo_count = atoi(value);
242                 if (ctx.cfg.max_repo_count <= 0)
243                         ctx.cfg.max_repo_count = INT_MAX;
244         } else if (!strcmp(name, "max-commit-count"))
245                 ctx.cfg.max_commit_count = atoi(value);
246         else if (!strcmp(name, "project-list"))
247                 ctx.cfg.project_list = xstrdup(expand_macros(value));
248         else if (!strcmp(name, "scan-path"))
249                 if (ctx.cfg.cache_size)
250                         process_cached_repolist(expand_macros(value));
251                 else if (ctx.cfg.project_list)
252                         scan_projects(expand_macros(value),
253                                       ctx.cfg.project_list, repo_config);
254                 else
255                         scan_tree(expand_macros(value), repo_config);
256         else if (!strcmp(name, "scan-hidden-path"))
257                 ctx.cfg.scan_hidden_path = atoi(value);
258         else if (!strcmp(name, "section-from-path"))
259                 ctx.cfg.section_from_path = atoi(value);
260         else if (!strcmp(name, "repository-sort"))
261                 ctx.cfg.repository_sort = xstrdup(value);
262         else if (!strcmp(name, "section-sort"))
263                 ctx.cfg.section_sort = atoi(value);
264         else if (!strcmp(name, "source-filter"))
265                 ctx.cfg.source_filter = cgit_new_filter(value, SOURCE);
266         else if (!strcmp(name, "summary-log"))
267                 ctx.cfg.summary_log = atoi(value);
268         else if (!strcmp(name, "summary-branches"))
269                 ctx.cfg.summary_branches = atoi(value);
270         else if (!strcmp(name, "summary-tags"))
271                 ctx.cfg.summary_tags = atoi(value);
272         else if (!strcmp(name, "side-by-side-diffs"))
273                 ctx.cfg.difftype = atoi(value) ? DIFF_SSDIFF : DIFF_UNIFIED;
274         else if (!strcmp(name, "agefile"))
275                 ctx.cfg.agefile = xstrdup(value);
276         else if (!strcmp(name, "mimetype-file"))
277                 ctx.cfg.mimetype_file = xstrdup(value);
278         else if (!strcmp(name, "renamelimit"))
279                 ctx.cfg.renamelimit = atoi(value);
280         else if (!strcmp(name, "remove-suffix"))
281                 ctx.cfg.remove_suffix = atoi(value);
282         else if (!strcmp(name, "robots"))
283                 ctx.cfg.robots = xstrdup(value);
284         else if (!strcmp(name, "clone-prefix"))
285                 ctx.cfg.clone_prefix = xstrdup(value);
286         else if (!strcmp(name, "clone-url"))
287                 ctx.cfg.clone_url = xstrdup(value);
288         else if (!strcmp(name, "local-time"))
289                 ctx.cfg.local_time = atoi(value);
290         else if (!strcmp(name, "commit-sort")) {
291                 if (!strcmp(value, "date"))
292                         ctx.cfg.commit_sort = 1;
293                 if (!strcmp(value, "topo"))
294                         ctx.cfg.commit_sort = 2;
295         } else if (!strcmp(name, "branch-sort")) {
296                 if (!strcmp(value, "age"))
297                         ctx.cfg.branch_sort = 1;
298                 if (!strcmp(value, "name"))
299                         ctx.cfg.branch_sort = 0;
300         } else if (skip_prefix(name, "mimetype.", &arg))
301                 add_mimetype(arg, value);
302         else if (!strcmp(name, "include"))
303                 parse_configfile(expand_macros(value), config_cb);
304 }
305
306 static void querystring_cb(const char *name, const char *value)
307 {
308         if (!value)
309                 value = "";
310
311         if (!strcmp(name,"r")) {
312                 ctx.qry.repo = xstrdup(value);
313                 ctx.repo = cgit_get_repoinfo(value);
314         } else if (!strcmp(name, "p")) {
315                 ctx.qry.page = xstrdup(value);
316         } else if (!strcmp(name, "url")) {
317                 if (*value == '/')
318                         value++;
319                 ctx.qry.url = xstrdup(value);
320                 cgit_parse_url(value);
321         } else if (!strcmp(name, "qt")) {
322                 ctx.qry.grep = xstrdup(value);
323         } else if (!strcmp(name, "q")) {
324                 ctx.qry.search = xstrdup(value);
325         } else if (!strcmp(name, "h")) {
326                 ctx.qry.head = xstrdup(value);
327                 ctx.qry.has_symref = 1;
328         } else if (!strcmp(name, "id")) {
329                 ctx.qry.oid = xstrdup(value);
330                 ctx.qry.has_oid = 1;
331         } else if (!strcmp(name, "id2")) {
332                 ctx.qry.oid2 = xstrdup(value);
333                 ctx.qry.has_oid = 1;
334         } else if (!strcmp(name, "ofs")) {
335                 ctx.qry.ofs = atoi(value);
336         } else if (!strcmp(name, "path")) {
337                 ctx.qry.path = trim_end(value, '/');
338         } else if (!strcmp(name, "name")) {
339                 ctx.qry.name = xstrdup(value);
340         } else if (!strcmp(name, "s")) {
341                 ctx.qry.sort = xstrdup(value);
342         } else if (!strcmp(name, "showmsg")) {
343                 ctx.qry.showmsg = atoi(value);
344         } else if (!strcmp(name, "period")) {
345                 ctx.qry.period = xstrdup(value);
346         } else if (!strcmp(name, "dt")) {
347                 ctx.qry.difftype = atoi(value);
348                 ctx.qry.has_difftype = 1;
349         } else if (!strcmp(name, "ss")) {
350                 /* No longer generated, but there may be links out there. */
351                 ctx.qry.difftype = atoi(value) ? DIFF_SSDIFF : DIFF_UNIFIED;
352                 ctx.qry.has_difftype = 1;
353         } else if (!strcmp(name, "all")) {
354                 ctx.qry.show_all = atoi(value);
355         } else if (!strcmp(name, "context")) {
356                 ctx.qry.context = atoi(value);
357         } else if (!strcmp(name, "ignorews")) {
358                 ctx.qry.ignorews = atoi(value);
359         } else if (!strcmp(name, "follow")) {
360                 ctx.qry.follow = atoi(value);
361         }
362 }
363
364 static void prepare_context(void)
365 {
366         memset(&ctx, 0, sizeof(ctx));
367         ctx.cfg.agefile = "info/web/last-modified";
368         ctx.cfg.cache_size = 0;
369         ctx.cfg.cache_max_create_time = 5;
370         ctx.cfg.cache_root = CGIT_CACHE_ROOT;
371         ctx.cfg.cache_about_ttl = 15;
372         ctx.cfg.cache_snapshot_ttl = 5;
373         ctx.cfg.cache_repo_ttl = 5;
374         ctx.cfg.cache_root_ttl = 5;
375         ctx.cfg.cache_scanrc_ttl = 15;
376         ctx.cfg.cache_dynamic_ttl = 5;
377         ctx.cfg.cache_static_ttl = -1;
378         ctx.cfg.case_sensitive_sort = 1;
379         ctx.cfg.branch_sort = 0;
380         ctx.cfg.commit_sort = 0;
381         ctx.cfg.logo = "/cgit.png";
382         ctx.cfg.favicon = "/favicon.ico";
383         ctx.cfg.local_time = 0;
384         ctx.cfg.enable_http_clone = 1;
385         ctx.cfg.enable_index_owner = 1;
386         ctx.cfg.enable_tree_linenumbers = 1;
387         ctx.cfg.enable_git_config = 0;
388         ctx.cfg.max_repo_count = 50;
389         ctx.cfg.max_commit_count = 50;
390         ctx.cfg.max_lock_attempts = 5;
391         ctx.cfg.max_msg_len = 80;
392         ctx.cfg.max_repodesc_len = 80;
393         ctx.cfg.max_blob_size = 0;
394         ctx.cfg.max_stats = 0;
395         ctx.cfg.project_list = NULL;
396         ctx.cfg.renamelimit = -1;
397         ctx.cfg.remove_suffix = 0;
398         ctx.cfg.robots = "index, nofollow";
399         ctx.cfg.root_title = "Git repository browser";
400         ctx.cfg.root_desc = "a fast webinterface for the git dscm";
401         ctx.cfg.scan_hidden_path = 0;
402         ctx.cfg.script_name = CGIT_SCRIPT_NAME;
403         ctx.cfg.section = "";
404         ctx.cfg.repository_sort = "name";
405         ctx.cfg.section_sort = 1;
406         ctx.cfg.summary_branches = 10;
407         ctx.cfg.summary_log = 10;
408         ctx.cfg.summary_tags = 10;
409         ctx.cfg.max_atom_items = 10;
410         ctx.cfg.difftype = DIFF_UNIFIED;
411         ctx.env.cgit_config = getenv("CGIT_CONFIG");
412         ctx.env.http_host = getenv("HTTP_HOST");
413         ctx.env.https = getenv("HTTPS");
414         ctx.env.no_http = getenv("NO_HTTP");
415         ctx.env.path_info = getenv("PATH_INFO");
416         ctx.env.query_string = getenv("QUERY_STRING");
417         ctx.env.request_method = getenv("REQUEST_METHOD");
418         ctx.env.script_name = getenv("SCRIPT_NAME");
419         ctx.env.server_name = getenv("SERVER_NAME");
420         ctx.env.server_port = getenv("SERVER_PORT");
421         ctx.env.http_cookie = getenv("HTTP_COOKIE");
422         ctx.env.http_referer = getenv("HTTP_REFERER");
423         ctx.env.content_length = getenv("CONTENT_LENGTH") ? strtoul(getenv("CONTENT_LENGTH"), NULL, 10) : 0;
424         ctx.env.authenticated = 0;
425         ctx.page.mimetype = "text/html";
426         ctx.page.charset = PAGE_ENCODING;
427         ctx.page.filename = NULL;
428         ctx.page.size = 0;
429         ctx.page.modified = time(NULL);
430         ctx.page.expires = ctx.page.modified;
431         ctx.page.etag = NULL;
432         string_list_init_dup(&ctx.cfg.mimetypes);
433         if (ctx.env.script_name)
434                 ctx.cfg.script_name = xstrdup(ctx.env.script_name);
435         if (ctx.env.query_string)
436                 ctx.qry.raw = xstrdup(ctx.env.query_string);
437         if (!ctx.env.cgit_config)
438                 ctx.env.cgit_config = CGIT_CONFIG;
439 }
440
441 struct refmatch {
442         char *req_ref;
443         char *first_ref;
444         int match;
445 };
446
447 static int find_current_ref(const char *refname, const struct object_id *oid,
448                             int flags, void *cb_data)
449 {
450         struct refmatch *info;
451
452         info = (struct refmatch *)cb_data;
453         if (!strcmp(refname, info->req_ref))
454                 info->match = 1;
455         if (!info->first_ref)
456                 info->first_ref = xstrdup(refname);
457         return info->match;
458 }
459
460 static void free_refmatch_inner(struct refmatch *info)
461 {
462         if (info->first_ref)
463                 free(info->first_ref);
464 }
465
466 static char *find_default_branch(struct cgit_repo *repo)
467 {
468         struct refmatch info;
469         char *ref;
470
471         info.req_ref = repo->defbranch;
472         info.first_ref = NULL;
473         info.match = 0;
474         for_each_branch_ref(find_current_ref, &info);
475         if (info.match)
476                 ref = info.req_ref;
477         else
478                 ref = info.first_ref;
479         if (ref)
480                 ref = xstrdup(ref);
481         free_refmatch_inner(&info);
482
483         return ref;
484 }
485
486 static char *guess_defbranch(void)
487 {
488         const char *ref, *refname;
489         struct object_id oid;
490
491         ref = resolve_ref_unsafe("HEAD", 0, &oid, NULL);
492         if (!ref || !skip_prefix(ref, "refs/heads/", &refname))
493                 return "master";
494         return xstrdup(refname);
495 }
496
497 /* The caller must free filename and ref after calling this. */
498 static inline void parse_readme(const char *readme, char **filename, char **ref, struct cgit_repo *repo)
499 {
500         const char *colon;
501
502         *filename = NULL;
503         *ref = NULL;
504
505         if (!readme || !readme[0])
506                 return;
507
508         /* Check if the readme is tracked in the git repo. */
509         colon = strchr(readme, ':');
510         if (colon && strlen(colon) > 1) {
511                 /* If it starts with a colon, we want to use head given
512                  * from query or the default branch */
513                 if (colon == readme && ctx.qry.head)
514                         *ref = xstrdup(ctx.qry.head);
515                 else if (colon == readme && repo->defbranch)
516                         *ref = xstrdup(repo->defbranch);
517                 else
518                         *ref = xstrndup(readme, colon - readme);
519                 readme = colon + 1;
520         }
521
522         /* Prepend repo path to relative readme path unless tracked. */
523         if (!(*ref) && readme[0] != '/')
524                 *filename = fmtalloc("%s/%s", repo->path, readme);
525         else
526                 *filename = xstrdup(readme);
527 }
528 static void choose_readme(struct cgit_repo *repo)
529 {
530         int found;
531         char *filename, *ref;
532         struct string_list_item *entry;
533
534         if (!repo->readme.nr)
535                 return;
536
537         found = 0;
538         for_each_string_list_item(entry, &repo->readme) {
539                 parse_readme(entry->string, &filename, &ref, repo);
540                 if (!filename) {
541                         free(filename);
542                         free(ref);
543                         continue;
544                 }
545                 if (ref) {
546                         if (cgit_ref_path_exists(filename, ref, 1)) {
547                                 found = 1;
548                                 break;
549                         }
550                 }
551                 else if (!access(filename, R_OK)) {
552                         found = 1;
553                         break;
554                 }
555                 free(filename);
556                 free(ref);
557         }
558         repo->readme.strdup_strings = 1;
559         string_list_clear(&repo->readme, 0);
560         repo->readme.strdup_strings = 0;
561         if (found)
562                 string_list_append(&repo->readme, filename)->util = ref;
563 }
564
565 static void print_no_repo_clone_urls(const char *url)
566 {
567         html("<tr><td><a rel='vcs-git' href='");
568         html_url_path(url);
569         html("' title='");
570         html_attr(ctx.repo->name);
571         html(" Git repository'>");
572         html_txt(url);
573         html("</a></td></tr>\n");
574 }
575
576 static void prepare_repo_env(int *nongit)
577 {
578         /* The path to the git repository. */
579         setenv("GIT_DIR", ctx.repo->path, 1);
580
581         /* Setup the git directory and initialize the notes system. Both of these
582          * load local configuration from the git repository, so we do them both while
583          * the HOME variables are unset. */
584         setup_git_directory_gently(nongit);
585         load_display_notes(NULL);
586 }
587
588 static int prepare_repo_cmd(int nongit)
589 {
590         struct object_id oid;
591         int rc;
592
593         if (nongit) {
594                 const char *name = ctx.repo->name;
595                 rc = errno;
596                 ctx.page.title = fmtalloc("%s - %s", ctx.cfg.root_title,
597                                                 "config error");
598                 ctx.repo = NULL;
599                 cgit_print_http_headers();
600                 cgit_print_docstart();
601                 cgit_print_pageheader();
602                 cgit_print_error("Failed to open %s: %s", name,
603                                  rc ? strerror(rc) : "Not a valid git repository");
604                 cgit_print_docend();
605                 return 1;
606         }
607         ctx.page.title = fmtalloc("%s - %s", ctx.repo->name, ctx.repo->desc);
608
609         if (!ctx.repo->defbranch)
610                 ctx.repo->defbranch = guess_defbranch();
611
612         if (!ctx.qry.head) {
613                 ctx.qry.nohead = 1;
614                 ctx.qry.head = find_default_branch(ctx.repo);
615         }
616
617         if (!ctx.qry.head) {
618                 cgit_print_http_headers();
619                 cgit_print_docstart();
620                 cgit_print_pageheader();
621                 cgit_print_error("Repository seems to be empty");
622                 if (!strcmp(ctx.qry.page, "summary")) {
623                         html("<table class='list'><tr class='nohover'><td>&nbsp;</td></tr><tr class='nohover'><th class='left'>Clone</th></tr>\n");
624                         cgit_prepare_repo_env(ctx.repo);
625                         cgit_add_clone_urls(print_no_repo_clone_urls);
626                         html("</table>\n");
627                 }
628                 cgit_print_docend();
629                 return 1;
630         }
631
632         if (get_oid(ctx.qry.head, &oid)) {
633                 char *old_head = ctx.qry.head;
634                 ctx.qry.head = xstrdup(ctx.repo->defbranch);
635                 cgit_print_error_page(404, "Not found",
636                                 "Invalid branch: %s", old_head);
637                 free(old_head);
638                 return 1;
639         }
640         string_list_sort(&ctx.repo->submodules);
641         cgit_prepare_repo_env(ctx.repo);
642         choose_readme(ctx.repo);
643         return 0;
644 }
645
646 static inline void open_auth_filter(const char *function)
647 {
648         cgit_open_filter(ctx.cfg.auth_filter, function,
649                 ctx.env.http_cookie ? ctx.env.http_cookie : "",
650                 ctx.env.request_method ? ctx.env.request_method : "",
651                 ctx.env.query_string ? ctx.env.query_string : "",
652                 ctx.env.http_referer ? ctx.env.http_referer : "",
653                 ctx.env.path_info ? ctx.env.path_info : "",
654                 ctx.env.http_host ? ctx.env.http_host : "",
655                 ctx.env.https ? ctx.env.https : "",
656                 ctx.qry.repo ? ctx.qry.repo : "",
657                 ctx.qry.page ? ctx.qry.page : "",
658                 cgit_currentfullurl(),
659                 cgit_loginurl());
660 }
661
662 /* We intentionally keep this rather small, instead of looping and
663  * feeding it to the filter a couple bytes at a time. This way, the
664  * filter itself does not need to handle any denial of service or
665  * buffer bloat issues. If this winds up being too small, people
666  * will complain on the mailing list, and we'll increase it as needed. */
667 #define MAX_AUTHENTICATION_POST_BYTES 4096
668 /* The filter is expected to spit out "Status: " and all headers. */
669 static inline void authenticate_post(void)
670 {
671         char buffer[MAX_AUTHENTICATION_POST_BYTES];
672         ssize_t len;
673
674         open_auth_filter("authenticate-post");
675         len = ctx.env.content_length;
676         if (len > MAX_AUTHENTICATION_POST_BYTES)
677                 len = MAX_AUTHENTICATION_POST_BYTES;
678         if ((len = read(STDIN_FILENO, buffer, len)) < 0)
679                 die_errno("Could not read POST from stdin");
680         if (write(STDOUT_FILENO, buffer, len) < 0)
681                 die_errno("Could not write POST to stdout");
682         cgit_close_filter(ctx.cfg.auth_filter);
683         exit(0);
684 }
685
686 static inline void authenticate_cookie(void)
687 {
688         /* If we don't have an auth_filter, consider all cookies valid, and thus return early. */
689         if (!ctx.cfg.auth_filter) {
690                 ctx.env.authenticated = 1;
691                 return;
692         }
693
694         /* If we're having something POST'd to /login, we're authenticating POST,
695          * instead of the cookie, so call authenticate_post and bail out early.
696          * This pattern here should match /?p=login with POST. */
697         if (ctx.env.request_method && ctx.qry.page && !ctx.repo && \
698             !strcmp(ctx.env.request_method, "POST") && !strcmp(ctx.qry.page, "login")) {
699                 authenticate_post();
700                 return;
701         }
702
703         /* If we've made it this far, we're authenticating the cookie for real, so do that. */
704         open_auth_filter("authenticate-cookie");
705         ctx.env.authenticated = cgit_close_filter(ctx.cfg.auth_filter);
706 }
707
708 static void process_request(void)
709 {
710         struct cgit_cmd *cmd;
711         int nongit = 0;
712
713         /* If we're not yet authenticated, no matter what page we're on,
714          * display the authentication body from the auth_filter. This should
715          * never be cached. */
716         if (!ctx.env.authenticated) {
717                 ctx.page.title = "Authentication Required";
718                 cgit_print_http_headers();
719                 cgit_print_docstart();
720                 cgit_print_pageheader();
721                 open_auth_filter("body");
722                 cgit_close_filter(ctx.cfg.auth_filter);
723                 cgit_print_docend();
724                 return;
725         }
726
727         if (ctx.repo)
728                 prepare_repo_env(&nongit);
729
730         cmd = cgit_get_cmd();
731         if (!cmd) {
732                 ctx.page.title = "cgit error";
733                 cgit_print_error_page(404, "Not found", "Invalid request");
734                 return;
735         }
736
737         if (!ctx.cfg.enable_http_clone && cmd->is_clone) {
738                 ctx.page.title = "cgit error";
739                 cgit_print_error_page(404, "Not found", "Invalid request");
740                 return;
741         }
742
743         if (cmd->want_repo && !ctx.repo) {
744                 cgit_print_error_page(400, "Bad request",
745                                 "No repository selected");
746                 return;
747         }
748
749         /* If cmd->want_vpath is set, assume ctx.qry.path contains a "virtual"
750          * in-project path limit to be made available at ctx.qry.vpath.
751          * Otherwise, no path limit is in effect (ctx.qry.vpath = NULL).
752          */
753         ctx.qry.vpath = cmd->want_vpath ? ctx.qry.path : NULL;
754
755         if (ctx.repo && prepare_repo_cmd(nongit))
756                 return;
757
758         cmd->fn();
759 }
760
761 static int cmp_repos(const void *a, const void *b)
762 {
763         const struct cgit_repo *ra = a, *rb = b;
764         return strcmp(ra->url, rb->url);
765 }
766
767 static char *build_snapshot_setting(int bitmap)
768 {
769         const struct cgit_snapshot_format *f;
770         struct strbuf result = STRBUF_INIT;
771
772         for (f = cgit_snapshot_formats; f->suffix; f++) {
773                 if (cgit_snapshot_format_bit(f) & bitmap) {
774                         if (result.len)
775                                 strbuf_addch(&result, ' ');
776                         strbuf_addstr(&result, f->suffix);
777                 }
778         }
779         return strbuf_detach(&result, NULL);
780 }
781
782 static char *get_first_line(char *txt)
783 {
784         char *t = xstrdup(txt);
785         char *p = strchr(t, '\n');
786         if (p)
787                 *p = '\0';
788         return t;
789 }
790
791 static void print_repo(FILE *f, struct cgit_repo *repo)
792 {
793         struct string_list_item *item;
794         fprintf(f, "repo.url=%s\n", repo->url);
795         fprintf(f, "repo.name=%s\n", repo->name);
796         fprintf(f, "repo.path=%s\n", repo->path);
797         if (repo->owner)
798                 fprintf(f, "repo.owner=%s\n", repo->owner);
799         if (repo->desc) {
800                 char *tmp = get_first_line(repo->desc);
801                 fprintf(f, "repo.desc=%s\n", tmp);
802                 free(tmp);
803         }
804         for_each_string_list_item(item, &repo->readme) {
805                 if (item->util)
806                         fprintf(f, "repo.readme=%s:%s\n", (char *)item->util, item->string);
807                 else
808                         fprintf(f, "repo.readme=%s\n", item->string);
809         }
810         if (repo->defbranch)
811                 fprintf(f, "repo.defbranch=%s\n", repo->defbranch);
812         if (repo->extra_head_content)
813                 fprintf(f, "repo.extra-head-content=%s\n", repo->extra_head_content);
814         if (repo->module_link)
815                 fprintf(f, "repo.module-link=%s\n", repo->module_link);
816         if (repo->section)
817                 fprintf(f, "repo.section=%s\n", repo->section);
818         if (repo->homepage)
819                 fprintf(f, "repo.homepage=%s\n", repo->homepage);
820         if (repo->clone_url)
821                 fprintf(f, "repo.clone-url=%s\n", repo->clone_url);
822         fprintf(f, "repo.enable-blame=%d\n",
823                 repo->enable_blame);
824         fprintf(f, "repo.enable-commit-graph=%d\n",
825                 repo->enable_commit_graph);
826         fprintf(f, "repo.enable-log-filecount=%d\n",
827                 repo->enable_log_filecount);
828         fprintf(f, "repo.enable-log-linecount=%d\n",
829                 repo->enable_log_linecount);
830         if (repo->about_filter && repo->about_filter != ctx.cfg.about_filter)
831                 cgit_fprintf_filter(repo->about_filter, f, "repo.about-filter=");
832         if (repo->commit_filter && repo->commit_filter != ctx.cfg.commit_filter)
833                 cgit_fprintf_filter(repo->commit_filter, f, "repo.commit-filter=");
834         if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
835                 cgit_fprintf_filter(repo->source_filter, f, "repo.source-filter=");
836         if (repo->email_filter && repo->email_filter != ctx.cfg.email_filter)
837                 cgit_fprintf_filter(repo->email_filter, f, "repo.email-filter=");
838         if (repo->owner_filter && repo->owner_filter != ctx.cfg.owner_filter)
839                 cgit_fprintf_filter(repo->owner_filter, f, "repo.owner-filter=");
840         if (repo->snapshots != ctx.cfg.snapshots) {
841                 char *tmp = build_snapshot_setting(repo->snapshots);
842                 fprintf(f, "repo.snapshots=%s\n", tmp ? tmp : "");
843                 free(tmp);
844         }
845         if (repo->snapshot_prefix)
846                 fprintf(f, "repo.snapshot-prefix=%s\n", repo->snapshot_prefix);
847         if (repo->max_stats != ctx.cfg.max_stats)
848                 fprintf(f, "repo.max-stats=%s\n",
849                         cgit_find_stats_periodname(repo->max_stats));
850         if (repo->logo)
851                 fprintf(f, "repo.logo=%s\n", repo->logo);
852         if (repo->logo_link)
853                 fprintf(f, "repo.logo-link=%s\n", repo->logo_link);
854         fprintf(f, "repo.enable-remote-branches=%d\n", repo->enable_remote_branches);
855         fprintf(f, "repo.enable-subject-links=%d\n", repo->enable_subject_links);
856         fprintf(f, "repo.enable-html-serving=%d\n", repo->enable_html_serving);
857         if (repo->branch_sort == 1)
858                 fprintf(f, "repo.branch-sort=age\n");
859         if (repo->commit_sort) {
860                 if (repo->commit_sort == 1)
861                         fprintf(f, "repo.commit-sort=date\n");
862                 else if (repo->commit_sort == 2)
863                         fprintf(f, "repo.commit-sort=topo\n");
864         }
865         fprintf(f, "repo.hide=%d\n", repo->hide);
866         fprintf(f, "repo.ignore=%d\n", repo->ignore);
867         fprintf(f, "\n");
868 }
869
870 static void print_repolist(FILE *f, struct cgit_repolist *list, int start)
871 {
872         int i;
873
874         for (i = start; i < list->count; i++)
875                 print_repo(f, &list->repos[i]);
876 }
877
878 /* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
879  * and return 0 on success.
880  */
881 static int generate_cached_repolist(const char *path, const char *cached_rc)
882 {
883         struct strbuf locked_rc = STRBUF_INIT;
884         int result = 0;
885         int idx;
886         FILE *f;
887
888         strbuf_addf(&locked_rc, "%s.lock", cached_rc);
889         f = fopen(locked_rc.buf, "wx");
890         if (!f) {
891                 /* Inform about the error unless the lockfile already existed,
892                  * since that only means we've got concurrent requests.
893                  */
894                 result = errno;
895                 if (result != EEXIST)
896                         fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
897                                 locked_rc.buf, strerror(result), result);
898                 goto out;
899         }
900         idx = cgit_repolist.count;
901         if (ctx.cfg.project_list)
902                 scan_projects(path, ctx.cfg.project_list, repo_config);
903         else
904                 scan_tree(path, repo_config);
905         print_repolist(f, &cgit_repolist, idx);
906         if (rename(locked_rc.buf, cached_rc))
907                 fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
908                         locked_rc.buf, cached_rc, strerror(errno), errno);
909         fclose(f);
910 out:
911         strbuf_release(&locked_rc);
912         return result;
913 }
914
915 static void process_cached_repolist(const char *path)
916 {
917         struct stat st;
918         struct strbuf cached_rc = STRBUF_INIT;
919         time_t age;
920         unsigned long hash;
921
922         hash = hash_str(path);
923         if (ctx.cfg.project_list)
924                 hash += hash_str(ctx.cfg.project_list);
925         strbuf_addf(&cached_rc, "%s/rc-%8lx", ctx.cfg.cache_root, hash);
926
927         if (stat(cached_rc.buf, &st)) {
928                 /* Nothing is cached, we need to scan without forking. And
929                  * if we fail to generate a cached repolist, we need to
930                  * invoke scan_tree manually.
931                  */
932                 if (generate_cached_repolist(path, cached_rc.buf)) {
933                         if (ctx.cfg.project_list)
934                                 scan_projects(path, ctx.cfg.project_list,
935                                               repo_config);
936                         else
937                                 scan_tree(path, repo_config);
938                 }
939                 goto out;
940         }
941
942         parse_configfile(cached_rc.buf, config_cb);
943
944         /* If the cached configfile hasn't expired, lets exit now */
945         age = time(NULL) - st.st_mtime;
946         if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
947                 goto out;
948
949         /* The cached repolist has been parsed, but it was old. So lets
950          * rescan the specified path and generate a new cached repolist
951          * in a child-process to avoid latency for the current request.
952          */
953         if (fork())
954                 goto out;
955
956         exit(generate_cached_repolist(path, cached_rc.buf));
957 out:
958         strbuf_release(&cached_rc);
959 }
960
961 static void cgit_parse_args(int argc, const char **argv)
962 {
963         int i;
964         const char *arg;
965         int scan = 0;
966
967         for (i = 1; i < argc; i++) {
968                 if (!strcmp(argv[i], "--version")) {
969                         printf("CGit %s | https://git.zx2c4.com/cgit/\n\nCompiled in features:\n", CGIT_VERSION);
970 #ifdef NO_LUA
971                         printf("[-] ");
972 #else
973                         printf("[+] ");
974 #endif
975                         printf("Lua scripting\n");
976 #ifndef HAVE_LINUX_SENDFILE
977                         printf("[-] ");
978 #else
979                         printf("[+] ");
980 #endif
981                         printf("Linux sendfile() usage\n");
982
983                         exit(0);
984                 }
985                 if (skip_prefix(argv[i], "--cache=", &arg)) {
986                         ctx.cfg.cache_root = xstrdup(arg);
987                 } else if (!strcmp(argv[i], "--nohttp")) {
988                         ctx.env.no_http = "1";
989                 } else if (skip_prefix(argv[i], "--query=", &arg)) {
990                         ctx.qry.raw = xstrdup(arg);
991                 } else if (skip_prefix(argv[i], "--repo=", &arg)) {
992                         ctx.qry.repo = xstrdup(arg);
993                 } else if (skip_prefix(argv[i], "--page=", &arg)) {
994                         ctx.qry.page = xstrdup(arg);
995                 } else if (skip_prefix(argv[i], "--head=", &arg)) {
996                         ctx.qry.head = xstrdup(arg);
997                         ctx.qry.has_symref = 1;
998                 } else if (skip_prefix(argv[i], "--oid=", &arg)) {
999                         ctx.qry.oid = xstrdup(arg);
1000                         ctx.qry.has_oid = 1;
1001                 } else if (skip_prefix(argv[i], "--ofs=", &arg)) {
1002                         ctx.qry.ofs = atoi(arg);
1003                 } else if (skip_prefix(argv[i], "--scan-tree=", &arg) ||
1004                            skip_prefix(argv[i], "--scan-path=", &arg)) {
1005                         /*
1006                          * HACK: The global snapshot bit mask defines the set
1007                          * of allowed snapshot formats, but the config file
1008                          * hasn't been parsed yet so the mask is currently 0.
1009                          * By setting all bits high before scanning we make
1010                          * sure that any in-repo cgitrc snapshot setting is
1011                          * respected by scan_tree().
1012                          *
1013                          * NOTE: We assume that there aren't more than 8
1014                          * different snapshot formats supported by cgit...
1015                          */
1016                         ctx.cfg.snapshots = 0xFF;
1017                         scan++;
1018                         scan_tree(arg, repo_config);
1019                 }
1020         }
1021         if (scan) {
1022                 qsort(cgit_repolist.repos, cgit_repolist.count,
1023                         sizeof(struct cgit_repo), cmp_repos);
1024                 print_repolist(stdout, &cgit_repolist, 0);
1025                 exit(0);
1026         }
1027 }
1028
1029 static int calc_ttl(void)
1030 {
1031         if (!ctx.repo)
1032                 return ctx.cfg.cache_root_ttl;
1033
1034         if (!ctx.qry.page)
1035                 return ctx.cfg.cache_repo_ttl;
1036
1037         if (!strcmp(ctx.qry.page, "about"))
1038                 return ctx.cfg.cache_about_ttl;
1039
1040         if (!strcmp(ctx.qry.page, "snapshot"))
1041                 return ctx.cfg.cache_snapshot_ttl;
1042
1043         if (ctx.qry.has_oid)
1044                 return ctx.cfg.cache_static_ttl;
1045
1046         if (ctx.qry.has_symref)
1047                 return ctx.cfg.cache_dynamic_ttl;
1048
1049         return ctx.cfg.cache_repo_ttl;
1050 }
1051
1052 int cmd_main(int argc, const char **argv)
1053 {
1054         const char *path;
1055         int err, ttl;
1056
1057         cgit_init_filters();
1058         atexit(cgit_cleanup_filters);
1059
1060         prepare_context();
1061         cgit_repolist.length = 0;
1062         cgit_repolist.count = 0;
1063         cgit_repolist.repos = NULL;
1064
1065         cgit_parse_args(argc, argv);
1066         parse_configfile(expand_macros(ctx.env.cgit_config), config_cb);
1067         ctx.repo = NULL;
1068         http_parse_querystring(ctx.qry.raw, querystring_cb);
1069
1070         /* If virtual-root isn't specified in cgitrc, lets pretend
1071          * that virtual-root equals SCRIPT_NAME, minus any possibly
1072          * trailing slashes.
1073          */
1074         if (!ctx.cfg.virtual_root && ctx.cfg.script_name)
1075                 ctx.cfg.virtual_root = ensure_end(ctx.cfg.script_name, '/');
1076
1077         /* If no url parameter is specified on the querystring, lets
1078          * use PATH_INFO as url. This allows cgit to work with virtual
1079          * urls without the need for rewriterules in the webserver (as
1080          * long as PATH_INFO is included in the cache lookup key).
1081          */
1082         path = ctx.env.path_info;
1083         if (!ctx.qry.url && path) {
1084                 if (path[0] == '/')
1085                         path++;
1086                 ctx.qry.url = xstrdup(path);
1087                 if (ctx.qry.raw) {
1088                         char *newqry = fmtalloc("%s?%s", path, ctx.qry.raw);
1089                         free(ctx.qry.raw);
1090                         ctx.qry.raw = newqry;
1091                 } else
1092                         ctx.qry.raw = xstrdup(ctx.qry.url);
1093                 cgit_parse_url(ctx.qry.url);
1094         }
1095
1096         /* Before we go any further, we set ctx.env.authenticated by checking to see
1097          * if the supplied cookie is valid. All cookies are valid if there is no
1098          * auth_filter. If there is an auth_filter, the filter decides. */
1099         authenticate_cookie();
1100
1101         ttl = calc_ttl();
1102         if (ttl < 0)
1103                 ctx.page.expires += 10 * 365 * 24 * 60 * 60; /* 10 years */
1104         else
1105                 ctx.page.expires += ttl * 60;
1106         if (!ctx.env.authenticated || (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD")))
1107                 ctx.cfg.cache_size = 0;
1108         err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
1109                             ctx.qry.raw, ttl, process_request);
1110         cgit_cleanup_filters();
1111         if (err)
1112                 cgit_print_error("Error processing page: %s (%d)",
1113                                  strerror(err), err);
1114         return err;
1115 }