cgit.c

   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 static void add_mimetype(const char *name, const char *value)
  23 {
  24         struct string_list_item *item;
  25
  26         item = string_list_insert(&ctx.cfg.mimetypes, xstrdup(name));
  27         item->util = xstrdup(value);
  28 }
  29
  30 static void process_cached_repolist(const char *path);
  31
  32 static void repo_config(struct cgit_repo *repo, const char *name, const char *value)
  33 {
  34         struct string_list_item *item;
  35
  36         if (!strcmp(name, "name"))
  37                 repo->name = xstrdup(value);
  38         else if (!strcmp(name, "clone-url"))
  39                 repo->clone_url = xstrdup(value);
  40         else if (!strcmp(name, "desc"))
  41                 repo->desc = xstrdup(value);
  42         else if (!strcmp(name, "owner"))
  43                 repo->owner = xstrdup(value);
  44         else if (!strcmp(name, "defbranch"))
  45                 repo->defbranch = xstrdup(value);
  46         else if (!strcmp(name, "snapshots"))
  47                 repo->snapshots = ctx.cfg.snapshots & cgit_parse_snapshots_mask(value);
  48         else if (!strcmp(name, "enable-commit-graph"))
  49                 repo->enable_commit_graph = atoi(value);
  50         else if (!strcmp(name, "enable-log-filecount"))
  51                 repo->enable_log_filecount = atoi(value);
  52         else if (!strcmp(name, "enable-log-linecount"))
  53                 repo->enable_log_linecount = atoi(value);
  54         else if (!strcmp(name, "enable-remote-branches"))
  55                 repo->enable_remote_branches = atoi(value);
  56         else if (!strcmp(name, "enable-subject-links"))
  57                 repo->enable_subject_links = atoi(value);
  58         else if (!strcmp(name, "branch-sort")) {
  59                 if (!strcmp(value, "age"))
  60                         repo->branch_sort = 1;
  61                 if (!strcmp(value, "name"))
  62                         repo->branch_sort = 0;
  63         } else if (!strcmp(name, "commit-sort")) {
  64                 if (!strcmp(value, "date"))
  65                         repo->commit_sort = 1;
  66                 if (!strcmp(value, "topo"))
  67                         repo->commit_sort = 2;
  68         } else if (!strcmp(name, "max-stats"))
  69                 repo->max_stats = cgit_find_stats_period(value, NULL);
  70         else if (!strcmp(name, "module-link"))
  71                 repo->module_link= xstrdup(value);
  72         else if (starts_with(name, "module-link.")) {
  73                 item = string_list_append(&repo->submodules, xstrdup(name + 12));
  74                 item->util = xstrdup(value);
  75         } else if (!strcmp(name, "section"))
  76                 repo->section = xstrdup(value);
  77         else if (!strcmp(name, "readme") && value != NULL) {
  78                 if (repo->readme.items == ctx.cfg.readme.items)
  79                         memset(&repo->readme, 0, sizeof(repo->readme));
  80                 string_list_append(&repo->readme, xstrdup(value));
  81         } else if (!strcmp(name, "logo") && value != NULL)
  82                 repo->logo = xstrdup(value);
  83         else if (!strcmp(name, "logo-link") && value != NULL)
  84                 repo->logo_link = xstrdup(value);
  85         else if (ctx.cfg.enable_filter_overrides) {
  86                 if (!strcmp(name, "about-filter"))
  87                         repo->about_filter = cgit_new_filter(value, ABOUT);
  88                 else if (!strcmp(name, "commit-filter"))
  89                         repo->commit_filter = cgit_new_filter(value, COMMIT);
  90                 else if (!strcmp(name, "source-filter"))
  91                         repo->source_filter = cgit_new_filter(value, SOURCE);
  92                 else if (!strcmp(name, "email-filter"))
  93                         repo->email_filter = cgit_new_filter(value, EMAIL);
  94                 else if (!strcmp(name, "owner-filter"))
  95                         repo->owner_filter = cgit_new_filter(value, OWNER);
  96         }
  97 }
  98
  99 static void config_cb(const char *name, const char *value)
 100 {
 101         if (!strcmp(name, "section") || !strcmp(name, "repo.group"))
 102                 ctx.cfg.section = xstrdup(value);
 103         else if (!strcmp(name, "repo.url"))
 104                 ctx.repo = cgit_add_repo(value);
 105         else if (ctx.repo && !strcmp(name, "repo.path"))
 106                 ctx.repo->path = trim_end(value, '/');
 107         else if (ctx.repo && starts_with(name, "repo."))
 108                 repo_config(ctx.repo, name + 5, value);
 109         else if (!strcmp(name, "readme") && value != NULL)
 110                 string_list_append(&ctx.cfg.readme, xstrdup(value));
 111         else if (!strcmp(name, "root-title"))
 112                 ctx.cfg.root_title = xstrdup(value);
 113         else if (!strcmp(name, "root-desc"))
 114                 ctx.cfg.root_desc = xstrdup(value);
 115         else if (!strcmp(name, "root-readme"))
 116                 ctx.cfg.root_readme = xstrdup(value);
 117         else if (!strcmp(name, "css"))
 118                 ctx.cfg.css = xstrdup(value);
 119         else if (!strcmp(name, "favicon"))
 120                 ctx.cfg.favicon = xstrdup(value);
 121         else if (!strcmp(name, "footer"))
 122                 ctx.cfg.footer = xstrdup(value);
 123         else if (!strcmp(name, "head-include"))
 124                 ctx.cfg.head_include = xstrdup(value);
 125         else if (!strcmp(name, "header"))
 126                 ctx.cfg.header = xstrdup(value);
 127         else if (!strcmp(name, "logo"))
 128                 ctx.cfg.logo = xstrdup(value);
 129         else if (!strcmp(name, "index-header"))
 130                 ctx.cfg.index_header = xstrdup(value);
 131         else if (!strcmp(name, "index-info"))
 132                 ctx.cfg.index_info = xstrdup(value);
 133         else if (!strcmp(name, "logo-link"))
 134                 ctx.cfg.logo_link = xstrdup(value);
 135         else if (!strcmp(name, "module-link"))
 136                 ctx.cfg.module_link = xstrdup(value);
 137         else if (!strcmp(name, "strict-export"))
 138                 ctx.cfg.strict_export = xstrdup(value);
 139         else if (!strcmp(name, "virtual-root")) {
 140                 ctx.cfg.virtual_root = ensure_end(value, '/');
 141         } else if (!strcmp(name, "nocache"))
 142                 ctx.cfg.nocache = atoi(value);
 143         else if (!strcmp(name, "noplainemail"))
 144                 ctx.cfg.noplainemail = atoi(value);
 145         else if (!strcmp(name, "noheader"))
 146                 ctx.cfg.noheader = atoi(value);
 147         else if (!strcmp(name, "snapshots"))
 148                 ctx.cfg.snapshots = cgit_parse_snapshots_mask(value);
 149         else if (!strcmp(name, "enable-filter-overrides"))
 150                 ctx.cfg.enable_filter_overrides = atoi(value);
 151         else if (!strcmp(name, "enable-http-clone"))
 152                 ctx.cfg.enable_http_clone = atoi(value);
 153         else if (!strcmp(name, "enable-index-links"))
 154                 ctx.cfg.enable_index_links = atoi(value);
 155         else if (!strcmp(name, "enable-index-owner"))
 156                 ctx.cfg.enable_index_owner = atoi(value);
 157         else if (!strcmp(name, "enable-commit-graph"))
 158                 ctx.cfg.enable_commit_graph = atoi(value);
 159         else if (!strcmp(name, "enable-log-filecount"))
 160                 ctx.cfg.enable_log_filecount = atoi(value);
 161         else if (!strcmp(name, "enable-log-linecount"))
 162                 ctx.cfg.enable_log_linecount = atoi(value);
 163         else if (!strcmp(name, "enable-remote-branches"))
 164                 ctx.cfg.enable_remote_branches = atoi(value);
 165         else if (!strcmp(name, "enable-subject-links"))
 166                 ctx.cfg.enable_subject_links = atoi(value);
 167         else if (!strcmp(name, "enable-tree-linenumbers"))
 168                 ctx.cfg.enable_tree_linenumbers = atoi(value);
 169         else if (!strcmp(name, "enable-git-config"))
 170                 ctx.cfg.enable_git_config = atoi(value);
 171         else if (!strcmp(name, "max-stats"))
 172                 ctx.cfg.max_stats = cgit_find_stats_period(value, NULL);
 173         else if (!strcmp(name, "cache-size"))
 174                 ctx.cfg.cache_size = atoi(value);
 175         else if (!strcmp(name, "cache-root"))
 176                 ctx.cfg.cache_root = xstrdup(expand_macros(value));
 177         else if (!strcmp(name, "cache-root-ttl"))
 178                 ctx.cfg.cache_root_ttl = atoi(value);
 179         else if (!strcmp(name, "cache-repo-ttl"))
 180                 ctx.cfg.cache_repo_ttl = atoi(value);
 181         else if (!strcmp(name, "cache-scanrc-ttl"))
 182                 ctx.cfg.cache_scanrc_ttl = atoi(value);
 183         else if (!strcmp(name, "cache-static-ttl"))
 184                 ctx.cfg.cache_static_ttl = atoi(value);
 185         else if (!strcmp(name, "cache-dynamic-ttl"))
 186                 ctx.cfg.cache_dynamic_ttl = atoi(value);
 187         else if (!strcmp(name, "cache-about-ttl"))
 188                 ctx.cfg.cache_about_ttl = atoi(value);
 189         else if (!strcmp(name, "cache-snapshot-ttl"))
 190                 ctx.cfg.cache_snapshot_ttl = atoi(value);
 191         else if (!strcmp(name, "case-sensitive-sort"))
 192                 ctx.cfg.case_sensitive_sort = atoi(value);
 193         else if (!strcmp(name, "about-filter"))
 194                 ctx.cfg.about_filter = cgit_new_filter(value, ABOUT);
 195         else if (!strcmp(name, "commit-filter"))
 196                 ctx.cfg.commit_filter = cgit_new_filter(value, COMMIT);
 197         else if (!strcmp(name, "email-filter"))
 198                 ctx.cfg.email_filter = cgit_new_filter(value, EMAIL);
 199         else if (!strcmp(name, "owner-filter"))
 200                 ctx.cfg.owner_filter = cgit_new_filter(value, OWNER);
 201         else if (!strcmp(name, "auth-filter"))
 202                 ctx.cfg.auth_filter = cgit_new_filter(value, AUTH);
 203         else if (!strcmp(name, "embedded"))
 204                 ctx.cfg.embedded = atoi(value);
 205         else if (!strcmp(name, "max-atom-items"))
 206                 ctx.cfg.max_atom_items = atoi(value);
 207         else if (!strcmp(name, "max-message-length"))
 208                 ctx.cfg.max_msg_len = atoi(value);
 209         else if (!strcmp(name, "max-repodesc-length"))
 210                 ctx.cfg.max_repodesc_len = atoi(value);
 211         else if (!strcmp(name, "max-blob-size"))
 212                 ctx.cfg.max_blob_size = atoi(value);
 213         else if (!strcmp(name, "max-repo-count"))
 214                 ctx.cfg.max_repo_count = atoi(value);
 215         else if (!strcmp(name, "max-commit-count"))
 216                 ctx.cfg.max_commit_count = atoi(value);
 217         else if (!strcmp(name, "project-list"))
 218                 ctx.cfg.project_list = xstrdup(expand_macros(value));
 219         else if (!strcmp(name, "scan-path"))
 220                 if (!ctx.cfg.nocache && ctx.cfg.cache_size)
 221                         process_cached_repolist(expand_macros(value));
 222                 else if (ctx.cfg.project_list)
 223                         scan_projects(expand_macros(value),
 224                                       ctx.cfg.project_list, repo_config);
 225                 else
 226                         scan_tree(expand_macros(value), repo_config);
 227         else if (!strcmp(name, "scan-hidden-path"))
 228                 ctx.cfg.scan_hidden_path = atoi(value);
 229         else if (!strcmp(name, "section-from-path"))
 230                 ctx.cfg.section_from_path = atoi(value);
 231         else if (!strcmp(name, "repository-sort"))
 232                 ctx.cfg.repository_sort = xstrdup(value);
 233         else if (!strcmp(name, "section-sort"))
 234                 ctx.cfg.section_sort = atoi(value);
 235         else if (!strcmp(name, "source-filter"))
 236                 ctx.cfg.source_filter = cgit_new_filter(value, SOURCE);
 237         else if (!strcmp(name, "summary-log"))
 238                 ctx.cfg.summary_log = atoi(value);
 239         else if (!strcmp(name, "summary-branches"))
 240                 ctx.cfg.summary_branches = atoi(value);
 241         else if (!strcmp(name, "summary-tags"))
 242                 ctx.cfg.summary_tags = atoi(value);
 243         else if (!strcmp(name, "side-by-side-diffs"))
 244                 ctx.cfg.difftype = atoi(value) ? DIFF_SSDIFF : DIFF_UNIFIED;
 245         else if (!strcmp(name, "agefile"))
 246                 ctx.cfg.agefile = xstrdup(value);
 247         else if (!strcmp(name, "mimetype-file"))
 248                 ctx.cfg.mimetype_file = xstrdup(value);
 249         else if (!strcmp(name, "renamelimit"))
 250                 ctx.cfg.renamelimit = atoi(value);
 251         else if (!strcmp(name, "remove-suffix"))
 252                 ctx.cfg.remove_suffix = atoi(value);
 253         else if (!strcmp(name, "robots"))
 254                 ctx.cfg.robots = xstrdup(value);
 255         else if (!strcmp(name, "clone-prefix"))
 256                 ctx.cfg.clone_prefix = xstrdup(value);
 257         else if (!strcmp(name, "clone-url"))
 258                 ctx.cfg.clone_url = xstrdup(value);
 259         else if (!strcmp(name, "local-time"))
 260                 ctx.cfg.local_time = atoi(value);
 261         else if (!strcmp(name, "commit-sort")) {
 262                 if (!strcmp(value, "date"))
 263                         ctx.cfg.commit_sort = 1;
 264                 if (!strcmp(value, "topo"))
 265                         ctx.cfg.commit_sort = 2;
 266         } else if (!strcmp(name, "branch-sort")) {
 267                 if (!strcmp(value, "age"))
 268                         ctx.cfg.branch_sort = 1;
 269                 if (!strcmp(value, "name"))
 270                         ctx.cfg.branch_sort = 0;
 271         } else if (starts_with(name, "mimetype."))
 272                 add_mimetype(name + 9, value);
 273         else if (!strcmp(name, "include"))
 274                 parse_configfile(expand_macros(value), config_cb);
 275 }
 276
 277 static void querystring_cb(const char *name, const char *value)
 278 {
 279         if (!value)
 280                 value = "";
 281
 282         if (!strcmp(name,"r")) {
 283                 ctx.qry.repo = xstrdup(value);
 284                 ctx.repo = cgit_get_repoinfo(value);
 285         } else if (!strcmp(name, "p")) {
 286                 ctx.qry.page = xstrdup(value);
 287         } else if (!strcmp(name, "url")) {
 288                 if (*value == '/')
 289                         value++;
 290                 ctx.qry.url = xstrdup(value);
 291                 cgit_parse_url(value);
 292         } else if (!strcmp(name, "qt")) {
 293                 ctx.qry.grep = xstrdup(value);
 294         } else if (!strcmp(name, "q")) {
 295                 ctx.qry.search = xstrdup(value);
 296         } else if (!strcmp(name, "h")) {
 297                 ctx.qry.head = xstrdup(value);
 298                 ctx.qry.has_symref = 1;
 299         } else if (!strcmp(name, "id")) {
 300                 ctx.qry.sha1 = xstrdup(value);
 301                 ctx.qry.has_sha1 = 1;
 302         } else if (!strcmp(name, "id2")) {
 303                 ctx.qry.sha2 = xstrdup(value);
 304                 ctx.qry.has_sha1 = 1;
 305         } else if (!strcmp(name, "ofs")) {
 306                 ctx.qry.ofs = atoi(value);
 307         } else if (!strcmp(name, "path")) {
 308                 ctx.qry.path = trim_end(value, '/');
 309         } else if (!strcmp(name, "name")) {
 310                 ctx.qry.name = xstrdup(value);
 311         } else if (!strcmp(name, "mimetype")) {
 312                 ctx.qry.mimetype = xstrdup(value);
 313         } else if (!strcmp(name, "s")) {
 314                 ctx.qry.sort = xstrdup(value);
 315         } else if (!strcmp(name, "showmsg")) {
 316                 ctx.qry.showmsg = atoi(value);
 317         } else if (!strcmp(name, "period")) {
 318                 ctx.qry.period = xstrdup(value);
 319         } else if (!strcmp(name, "dt")) {
 320                 ctx.qry.difftype = atoi(value);
 321                 ctx.qry.has_difftype = 1;
 322         } else if (!strcmp(name, "ss")) {
 323                 /* No longer generated, but there may be links out there. */
 324                 ctx.qry.difftype = atoi(value) ? DIFF_SSDIFF : DIFF_UNIFIED;
 325                 ctx.qry.has_difftype = 1;
 326         } else if (!strcmp(name, "all")) {
 327                 ctx.qry.show_all = atoi(value);
 328         } else if (!strcmp(name, "context")) {
 329                 ctx.qry.context = atoi(value);
 330         } else if (!strcmp(name, "ignorews")) {
 331                 ctx.qry.ignorews = atoi(value);
 332         }
 333 }
 334
 335 static void prepare_context(void)
 336 {
 337         memset(&ctx, 0, sizeof(ctx));
 338         ctx.cfg.agefile = "info/web/last-modified";
 339         ctx.cfg.nocache = 0;
 340         ctx.cfg.cache_size = 0;
 341         ctx.cfg.cache_max_create_time = 5;
 342         ctx.cfg.cache_root = CGIT_CACHE_ROOT;
 343         ctx.cfg.cache_about_ttl = 15;
 344         ctx.cfg.cache_snapshot_ttl = 5;
 345         ctx.cfg.cache_repo_ttl = 5;
 346         ctx.cfg.cache_root_ttl = 5;
 347         ctx.cfg.cache_scanrc_ttl = 15;
 348         ctx.cfg.cache_dynamic_ttl = 5;
 349         ctx.cfg.cache_static_ttl = -1;
 350         ctx.cfg.case_sensitive_sort = 1;
 351         ctx.cfg.branch_sort = 0;
 352         ctx.cfg.commit_sort = 0;
 353         ctx.cfg.css = "/cgit.css";
 354         ctx.cfg.logo = "/cgit.png";
 355         ctx.cfg.favicon = "/favicon.ico";
 356         ctx.cfg.local_time = 0;
 357         ctx.cfg.enable_http_clone = 1;
 358         ctx.cfg.enable_index_owner = 1;
 359         ctx.cfg.enable_tree_linenumbers = 1;
 360         ctx.cfg.enable_git_config = 0;
 361         ctx.cfg.max_repo_count = 50;
 362         ctx.cfg.max_commit_count = 50;
 363         ctx.cfg.max_lock_attempts = 5;
 364         ctx.cfg.max_msg_len = 80;
 365         ctx.cfg.max_repodesc_len = 80;
 366         ctx.cfg.max_blob_size = 0;
 367         ctx.cfg.max_stats = 0;
 368         ctx.cfg.project_list = NULL;
 369         ctx.cfg.renamelimit = -1;
 370         ctx.cfg.remove_suffix = 0;
 371         ctx.cfg.robots = "index, nofollow";
 372         ctx.cfg.root_title = "Git repository browser";
 373         ctx.cfg.root_desc = "a fast webinterface for the git dscm";
 374         ctx.cfg.scan_hidden_path = 0;
 375         ctx.cfg.script_name = CGIT_SCRIPT_NAME;
 376         ctx.cfg.section = "";
 377         ctx.cfg.repository_sort = "name";
 378         ctx.cfg.section_sort = 1;
 379         ctx.cfg.summary_branches = 10;
 380         ctx.cfg.summary_log = 10;
 381         ctx.cfg.summary_tags = 10;
 382         ctx.cfg.max_atom_items = 10;
 383         ctx.cfg.difftype = DIFF_UNIFIED;
 384         ctx.env.cgit_config = getenv("CGIT_CONFIG");
 385         ctx.env.http_host = getenv("HTTP_HOST");
 386         ctx.env.https = getenv("HTTPS");
 387         ctx.env.no_http = getenv("NO_HTTP");
 388         ctx.env.path_info = getenv("PATH_INFO");
 389         ctx.env.query_string = getenv("QUERY_STRING");
 390         ctx.env.request_method = getenv("REQUEST_METHOD");
 391         ctx.env.script_name = getenv("SCRIPT_NAME");
 392         ctx.env.server_name = getenv("SERVER_NAME");
 393         ctx.env.server_port = getenv("SERVER_PORT");
 394         ctx.env.http_cookie = getenv("HTTP_COOKIE");
 395         ctx.env.http_referer = getenv("HTTP_REFERER");
 396         ctx.env.content_length = getenv("CONTENT_LENGTH") ? strtoul(getenv("CONTENT_LENGTH"), NULL, 10) : 0;
 397         ctx.env.authenticated = 0;
 398         ctx.page.mimetype = "text/html";
 399         ctx.page.charset = PAGE_ENCODING;
 400         ctx.page.filename = NULL;
 401         ctx.page.size = 0;
 402         ctx.page.modified = time(NULL);
 403         ctx.page.expires = ctx.page.modified;
 404         ctx.page.etag = NULL;
 405         memset(&ctx.cfg.mimetypes, 0, sizeof(struct string_list));
 406         if (ctx.env.script_name)
 407                 ctx.cfg.script_name = xstrdup(ctx.env.script_name);
 408         if (ctx.env.query_string)
 409                 ctx.qry.raw = xstrdup(ctx.env.query_string);
 410         if (!ctx.env.cgit_config)
 411                 ctx.env.cgit_config = CGIT_CONFIG;
 412 }
 413
 414 struct refmatch {
 415         char *req_ref;
 416         char *first_ref;
 417         int match;
 418 };
 419
 420 static int find_current_ref(const char *refname, const unsigned char *sha1,
 421                             int flags, void *cb_data)
 422 {
 423         struct refmatch *info;
 424
 425         info = (struct refmatch *)cb_data;
 426         if (!strcmp(refname, info->req_ref))
 427                 info->match = 1;
 428         if (!info->first_ref)
 429                 info->first_ref = xstrdup(refname);
 430         return info->match;
 431 }
 432
 433 static void free_refmatch_inner(struct refmatch *info)
 434 {
 435         if (info->first_ref)
 436                 free(info->first_ref);
 437 }
 438
 439 static char *find_default_branch(struct cgit_repo *repo)
 440 {
 441         struct refmatch info;
 442         char *ref;
 443
 444         info.req_ref = repo->defbranch;
 445         info.first_ref = NULL;
 446         info.match = 0;
 447         for_each_branch_ref(find_current_ref, &info);
 448         if (info.match)
 449                 ref = info.req_ref;
 450         else
 451                 ref = info.first_ref;
 452         if (ref)
 453                 ref = xstrdup(ref);
 454         free_refmatch_inner(&info);
 455
 456         return ref;
 457 }
 458
 459 static char *guess_defbranch(void)
 460 {
 461         const char *ref;
 462         unsigned char sha1[20];
 463
 464         ref = resolve_ref_unsafe("HEAD", 0, sha1, NULL);
 465         if (!ref || !starts_with(ref, "refs/heads/"))
 466                 return "master";
 467         return xstrdup(ref + 11);
 468 }
 469 /* The caller must free filename and ref after calling this. */
 470 static inline void parse_readme(const char *readme, char **filename, char **ref, struct cgit_repo *repo)
 471 {
 472         const char *colon;
 473
 474         *filename = NULL;
 475         *ref = NULL;
 476
 477         if (!readme || !readme[0])
 478                 return;
 479
 480         /* Check if the readme is tracked in the git repo. */
 481         colon = strchr(readme, ':');
 482         if (colon && strlen(colon) > 1) {
 483                 /* If it starts with a colon, we want to use
 484                  * the default branch */
 485                 if (colon == readme && repo->defbranch)
 486                         *ref = xstrdup(repo->defbranch);
 487                 else
 488                         *ref = xstrndup(readme, colon - readme);
 489                 readme = colon + 1;
 490         }
 491
 492         /* Prepend repo path to relative readme path unless tracked. */
 493         if (!(*ref) && readme[0] != '/')
 494                 *filename = fmtalloc("%s/%s", repo->path, readme);
 495         else
 496                 *filename = xstrdup(readme);
 497 }
 498 static void choose_readme(struct cgit_repo *repo)
 499 {
 500         int found;
 501         char *filename, *ref;
 502         struct string_list_item *entry;
 503
 504         if (!repo->readme.nr)
 505                 return;
 506
 507         found = 0;
 508         for_each_string_list_item(entry, &repo->readme) {
 509                 parse_readme(entry->string, &filename, &ref, repo);
 510                 if (!filename) {
 511                         free(filename);
 512                         free(ref);
 513                         continue;
 514                 }
 515                 if (ref) {
 516                         if (cgit_ref_path_exists(filename, ref, 1)) {
 517                                 found = 1;
 518                                 break;
 519                         }
 520                 }
 521                 else if (!access(filename, R_OK)) {
 522                         found = 1;
 523                         break;
 524                 }
 525                 free(filename);
 526                 free(ref);
 527         }
 528         repo->readme.strdup_strings = 1;
 529         string_list_clear(&repo->readme, 0);
 530         repo->readme.strdup_strings = 0;
 531         if (found)
 532                 string_list_append(&repo->readme, filename)->util = ref;
 533 }
 534
 535 static int prepare_repo_cmd(void)
 536 {
 537         unsigned char sha1[20];
 538         int nongit = 0;
 539         int rc;
 540
 541         /* The path to the git repository. */
 542         setenv("GIT_DIR", ctx.repo->path, 1);
 543
 544         /* Do not look in /etc/ for gitconfig and gitattributes. */
 545         setenv("GIT_CONFIG_NOSYSTEM", "1", 1);
 546         setenv("GIT_ATTR_NOSYSTEM", "1", 1);
 547         unsetenv("HOME");
 548         unsetenv("XDG_CONFIG_HOME");
 549
 550         /* Setup the git directory and initialize the notes system. Both of these
 551          * load local configuration from the git repository, so we do them both while
 552          * the HOME variables are unset. */
 553         setup_git_directory_gently(&nongit);
 554         init_display_notes(NULL);
 555
 556         if (nongit) {
 557                 const char *name = ctx.repo->name;
 558                 rc = errno;
 559                 ctx.page.title = fmtalloc("%s - %s", ctx.cfg.root_title,
 560                                                 "config error");
 561                 ctx.repo = NULL;
 562                 cgit_print_http_headers();
 563                 cgit_print_docstart();
 564                 cgit_print_pageheader();
 565                 cgit_print_error("Failed to open %s: %s", name,
 566                                  rc ? strerror(rc) : "Not a valid git repository");
 567                 cgit_print_docend();
 568                 return 1;
 569         }
 570         ctx.page.title = fmtalloc("%s - %s", ctx.repo->name, ctx.repo->desc);
 571
 572         if (!ctx.repo->defbranch)
 573                 ctx.repo->defbranch = guess_defbranch();
 574
 575         if (!ctx.qry.head) {
 576                 ctx.qry.nohead = 1;
 577                 ctx.qry.head = find_default_branch(ctx.repo);
 578         }
 579
 580         if (!ctx.qry.head) {
 581                 cgit_print_http_headers();
 582                 cgit_print_docstart();
 583                 cgit_print_pageheader();
 584                 cgit_print_error("Repository seems to be empty");
 585                 cgit_print_docend();
 586                 return 1;
 587         }
 588
 589         if (get_sha1(ctx.qry.head, sha1)) {
 590                 char *tmp = xstrdup(ctx.qry.head);
 591                 ctx.qry.head = ctx.repo->defbranch;
 592                 ctx.page.status = 404;
 593                 ctx.page.statusmsg = "Not found";
 594                 cgit_print_http_headers();
 595                 cgit_print_docstart();
 596                 cgit_print_pageheader();
 597                 cgit_print_error("Invalid branch: %s", tmp);
 598                 cgit_print_docend();
 599                 free(tmp);
 600                 return 1;
 601         }
 602         sort_string_list(&ctx.repo->submodules);
 603         cgit_prepare_repo_env(ctx.repo);
 604         choose_readme(ctx.repo);
 605         return 0;
 606 }
 607
 608 static inline void open_auth_filter(const char *function)
 609 {
 610         cgit_open_filter(ctx.cfg.auth_filter, function,
 611                 ctx.env.http_cookie ? ctx.env.http_cookie : "",
 612                 ctx.env.request_method ? ctx.env.request_method : "",
 613                 ctx.env.query_string ? ctx.env.query_string : "",
 614                 ctx.env.http_referer ? ctx.env.http_referer : "",
 615                 ctx.env.path_info ? ctx.env.path_info : "",
 616                 ctx.env.http_host ? ctx.env.http_host : "",
 617                 ctx.env.https ? ctx.env.https : "",
 618                 ctx.qry.repo ? ctx.qry.repo : "",
 619                 ctx.qry.page ? ctx.qry.page : "",
 620                 ctx.qry.url ? ctx.qry.url : "",
 621                 cgit_loginurl());
 622 }
 623
 624 /* We intentionally keep this rather small, instead of looping and
 625  * feeding it to the filter a couple bytes at a time. This way, the
 626  * filter itself does not need to handle any denial of service or
 627  * buffer bloat issues. If this winds up being too small, people
 628  * will complain on the mailing list, and we'll increase it as needed. */
 629 #define MAX_AUTHENTICATION_POST_BYTES 4096
 630 /* The filter is expected to spit out "Status: " and all headers. */
 631 static inline void authenticate_post(void)
 632 {
 633         char buffer[MAX_AUTHENTICATION_POST_BYTES];
 634         int len;
 635
 636         open_auth_filter("authenticate-post");
 637         len = ctx.env.content_length;
 638         if (len > MAX_AUTHENTICATION_POST_BYTES)
 639                 len = MAX_AUTHENTICATION_POST_BYTES;
 640         if (read(STDIN_FILENO, buffer, len) < 0)
 641                 die_errno("Could not read POST from stdin");
 642         if (write(STDOUT_FILENO, buffer, len) < 0)
 643                 die_errno("Could not write POST to stdout");
 644         cgit_close_filter(ctx.cfg.auth_filter);
 645         exit(0);
 646 }
 647
 648 static inline void authenticate_cookie(void)
 649 {
 650         /* If we don't have an auth_filter, consider all cookies valid, and thus return early. */
 651         if (!ctx.cfg.auth_filter) {
 652                 ctx.env.authenticated = 1;
 653                 return;
 654         }
 655
 656         /* If we're having something POST'd to /login, we're authenticating POST,
 657          * instead of the cookie, so call authenticate_post and bail out early.
 658          * This pattern here should match /?p=login with POST. */
 659         if (ctx.env.request_method && ctx.qry.page && !ctx.repo && \
 660             !strcmp(ctx.env.request_method, "POST") && !strcmp(ctx.qry.page, "login")) {
 661                 authenticate_post();
 662                 return;
 663         }
 664
 665         /* If we've made it this far, we're authenticating the cookie for real, so do that. */
 666         open_auth_filter("authenticate-cookie");
 667         ctx.env.authenticated = cgit_close_filter(ctx.cfg.auth_filter);
 668 }
 669
 670 static void process_request(void)
 671 {
 672         struct cgit_cmd *cmd;
 673
 674         /* If we're not yet authenticated, no matter what page we're on,
 675          * display the authentication body from the auth_filter. This should
 676          * never be cached. */
 677         if (!ctx.env.authenticated) {
 678                 ctx.page.title = "Authentication Required";
 679                 cgit_print_http_headers();
 680                 cgit_print_docstart();
 681                 cgit_print_pageheader();
 682                 open_auth_filter("body");
 683                 cgit_close_filter(ctx.cfg.auth_filter);
 684                 cgit_print_docend();
 685                 return;
 686         }
 687
 688         cmd = cgit_get_cmd();
 689         if (!cmd) {
 690                 ctx.page.title = "cgit error";
 691                 ctx.page.status = 404;
 692                 ctx.page.statusmsg = "Not found";
 693                 cgit_print_http_headers();
 694                 cgit_print_docstart();
 695                 cgit_print_pageheader();
 696                 cgit_print_error("Invalid request");
 697                 cgit_print_docend();
 698                 return;
 699         }
 700
 701         if (!ctx.cfg.enable_http_clone && cmd->is_clone) {
 702                 html_status(404, "Not found", 0);
 703                 return;
 704         }
 705
 706         /* If cmd->want_vpath is set, assume ctx.qry.path contains a "virtual"
 707          * in-project path limit to be made available at ctx.qry.vpath.
 708          * Otherwise, no path limit is in effect (ctx.qry.vpath = NULL).
 709          */
 710         ctx.qry.vpath = cmd->want_vpath ? ctx.qry.path : NULL;
 711
 712         if (cmd->want_repo && !ctx.repo) {
 713                 cgit_print_http_headers();
 714                 cgit_print_docstart();
 715                 cgit_print_pageheader();
 716                 cgit_print_error("No repository selected");
 717                 cgit_print_docend();
 718                 return;
 719         }
 720
 721         if (ctx.repo && prepare_repo_cmd())
 722                 return;
 723
 724         if (cmd->want_layout) {
 725                 cgit_print_http_headers();
 726                 cgit_print_docstart();
 727                 cgit_print_pageheader();
 728         }
 729
 730         cmd->fn();
 731
 732         if (cmd->want_layout)
 733                 cgit_print_docend();
 734 }
 735
 736 static int cmp_repos(const void *a, const void *b)
 737 {
 738         const struct cgit_repo *ra = a, *rb = b;
 739         return strcmp(ra->url, rb->url);
 740 }
 741
 742 static char *build_snapshot_setting(int bitmap)
 743 {
 744         const struct cgit_snapshot_format *f;
 745         struct strbuf result = STRBUF_INIT;
 746
 747         for (f = cgit_snapshot_formats; f->suffix; f++) {
 748                 if (f->bit & bitmap) {
 749                         if (result.len)
 750                                 strbuf_addch(&result, ' ');
 751                         strbuf_addstr(&result, f->suffix);
 752                 }
 753         }
 754         return strbuf_detach(&result, NULL);
 755 }
 756
 757 static char *get_first_line(char *txt)
 758 {
 759         char *t = xstrdup(txt);
 760         char *p = strchr(t, '\n');
 761         if (p)
 762                 *p = '\0';
 763         return t;
 764 }
 765
 766 static void print_repo(FILE *f, struct cgit_repo *repo)
 767 {
 768         struct string_list_item *item;
 769         fprintf(f, "repo.url=%s\n", repo->url);
 770         fprintf(f, "repo.name=%s\n", repo->name);
 771         fprintf(f, "repo.path=%s\n", repo->path);
 772         if (repo->owner)
 773                 fprintf(f, "repo.owner=%s\n", repo->owner);
 774         if (repo->desc) {
 775                 char *tmp = get_first_line(repo->desc);
 776                 fprintf(f, "repo.desc=%s\n", tmp);
 777                 free(tmp);
 778         }
 779         for_each_string_list_item(item, &repo->readme) {
 780                 if (item->util)
 781                         fprintf(f, "repo.readme=%s:%s\n", (char *)item->util, item->string);
 782                 else
 783                         fprintf(f, "repo.readme=%s\n", item->string);
 784         }
 785         if (repo->defbranch)
 786                 fprintf(f, "repo.defbranch=%s\n", repo->defbranch);
 787         if (repo->module_link)
 788                 fprintf(f, "repo.module-link=%s\n", repo->module_link);
 789         if (repo->section)
 790                 fprintf(f, "repo.section=%s\n", repo->section);
 791         if (repo->clone_url)
 792                 fprintf(f, "repo.clone-url=%s\n", repo->clone_url);
 793         fprintf(f, "repo.enable-commit-graph=%d\n",
 794                 repo->enable_commit_graph);
 795         fprintf(f, "repo.enable-log-filecount=%d\n",
 796                 repo->enable_log_filecount);
 797         fprintf(f, "repo.enable-log-linecount=%d\n",
 798                 repo->enable_log_linecount);
 799         if (repo->about_filter && repo->about_filter != ctx.cfg.about_filter)
 800                 cgit_fprintf_filter(repo->about_filter, f, "repo.about-filter=");
 801         if (repo->commit_filter && repo->commit_filter != ctx.cfg.commit_filter)
 802                 cgit_fprintf_filter(repo->commit_filter, f, "repo.commit-filter=");
 803         if (repo->source_filter && repo->source_filter != ctx.cfg.source_filter)
 804                 cgit_fprintf_filter(repo->source_filter, f, "repo.source-filter=");
 805         if (repo->email_filter && repo->email_filter != ctx.cfg.email_filter)
 806                 cgit_fprintf_filter(repo->email_filter, f, "repo.email-filter=");
 807         if (repo->owner_filter && repo->owner_filter != ctx.cfg.owner_filter)
 808                 cgit_fprintf_filter(repo->owner_filter, f, "repo.owner-filter=");
 809         if (repo->snapshots != ctx.cfg.snapshots) {
 810                 char *tmp = build_snapshot_setting(repo->snapshots);
 811                 fprintf(f, "repo.snapshots=%s\n", tmp ? tmp : "");
 812                 free(tmp);
 813         }
 814         if (repo->max_stats != ctx.cfg.max_stats)
 815                 fprintf(f, "repo.max-stats=%s\n",
 816                         cgit_find_stats_periodname(repo->max_stats));
 817         if (repo->logo)
 818                 fprintf(f, "repo.logo=%s\n", repo->logo);
 819         if (repo->logo_link)
 820                 fprintf(f, "repo.logo-link=%s\n", repo->logo_link);
 821         fprintf(f, "repo.enable-remote-branches=%d\n", repo->enable_remote_branches);
 822         fprintf(f, "repo.enable-subject-links=%d\n", repo->enable_subject_links);
 823         if (repo->branch_sort == 1)
 824                 fprintf(f, "repo.branch-sort=age\n");
 825         if (repo->commit_sort) {
 826                 if (repo->commit_sort == 1)
 827                         fprintf(f, "repo.commit-sort=date\n");
 828                 else if (repo->commit_sort == 2)
 829                         fprintf(f, "repo.commit-sort=topo\n");
 830         }
 831         fprintf(f, "\n");
 832 }
 833
 834 static void print_repolist(FILE *f, struct cgit_repolist *list, int start)
 835 {
 836         int i;
 837
 838         for (i = start; i < list->count; i++)
 839                 print_repo(f, &list->repos[i]);
 840 }
 841
 842 /* Scan 'path' for git repositories, save the resulting repolist in 'cached_rc'
 843  * and return 0 on success.
 844  */
 845 static int generate_cached_repolist(const char *path, const char *cached_rc)
 846 {
 847         struct strbuf locked_rc = STRBUF_INIT;
 848         int result = 0;
 849         int idx;
 850         FILE *f;
 851
 852         strbuf_addf(&locked_rc, "%s.lock", cached_rc);
 853         f = fopen(locked_rc.buf, "wx");
 854         if (!f) {
 855                 /* Inform about the error unless the lockfile already existed,
 856                  * since that only means we've got concurrent requests.
 857                  */
 858                 result = errno;
 859                 if (result != EEXIST)
 860                         fprintf(stderr, "[cgit] Error opening %s: %s (%d)\n",
 861                                 locked_rc.buf, strerror(result), result);
 862                 goto out;
 863         }
 864         idx = cgit_repolist.count;
 865         if (ctx.cfg.project_list)
 866                 scan_projects(path, ctx.cfg.project_list, repo_config);
 867         else
 868                 scan_tree(path, repo_config);
 869         print_repolist(f, &cgit_repolist, idx);
 870         if (rename(locked_rc.buf, cached_rc))
 871                 fprintf(stderr, "[cgit] Error renaming %s to %s: %s (%d)\n",
 872                         locked_rc.buf, cached_rc, strerror(errno), errno);
 873         fclose(f);
 874 out:
 875         strbuf_release(&locked_rc);
 876         return result;
 877 }
 878
 879 static void process_cached_repolist(const char *path)
 880 {
 881         struct stat st;
 882         struct strbuf cached_rc = STRBUF_INIT;
 883         time_t age;
 884         unsigned long hash;
 885
 886         hash = hash_str(path);
 887         if (ctx.cfg.project_list)
 888                 hash += hash_str(ctx.cfg.project_list);
 889         strbuf_addf(&cached_rc, "%s/rc-%8lx", ctx.cfg.cache_root, hash);
 890
 891         if (stat(cached_rc.buf, &st)) {
 892                 /* Nothing is cached, we need to scan without forking. And
 893                  * if we fail to generate a cached repolist, we need to
 894                  * invoke scan_tree manually.
 895                  */
 896                 if (generate_cached_repolist(path, cached_rc.buf)) {
 897                         if (ctx.cfg.project_list)
 898                                 scan_projects(path, ctx.cfg.project_list,
 899                                               repo_config);
 900                         else
 901                                 scan_tree(path, repo_config);
 902                 }
 903                 goto out;
 904         }
 905
 906         parse_configfile(cached_rc.buf, config_cb);
 907
 908         /* If the cached configfile hasn't expired, lets exit now */
 909         age = time(NULL) - st.st_mtime;
 910         if (age <= (ctx.cfg.cache_scanrc_ttl * 60))
 911                 goto out;
 912
 913         /* The cached repolist has been parsed, but it was old. So lets
 914          * rescan the specified path and generate a new cached repolist
 915          * in a child-process to avoid latency for the current request.
 916          */
 917         if (fork())
 918                 goto out;
 919
 920         exit(generate_cached_repolist(path, cached_rc.buf));
 921 out:
 922         strbuf_release(&cached_rc);
 923 }
 924
 925 static void cgit_parse_args(int argc, const char **argv)
 926 {
 927         int i;
 928         int scan = 0;
 929
 930         for (i = 1; i < argc; i++) {
 931                 if (!strcmp(argv[i], "--version")) {
 932                         printf("CGit %s | http://git.zx2c4.com/cgit/\n\nCompiled in features:\n", CGIT_VERSION);
 933 #ifdef NO_LUA
 934                         printf("[-] ");
 935 #else
 936                         printf("[+] ");
 937 #endif
 938                         printf("Lua scripting\n");
 939 #ifndef HAVE_LINUX_SENDFILE
 940                         printf("[-] ");
 941 #else
 942                         printf("[+] ");
 943 #endif
 944                         printf("Linux sendfile() usage\n");
 945
 946                         exit(0);
 947                 }
 948                 if (starts_with(argv[i], "--cache=")) {
 949                         ctx.cfg.cache_root = xstrdup(argv[i] + 8);
 950                 } else if (!strcmp(argv[i], "--nocache")) {
 951                         ctx.cfg.nocache = 1;
 952                 } else if (!strcmp(argv[i], "--nohttp")) {
 953                         ctx.env.no_http = "1";
 954                 } else if (starts_with(argv[i], "--query=")) {
 955                         ctx.qry.raw = xstrdup(argv[i] + 8);
 956                 } else if (starts_with(argv[i], "--repo=")) {
 957                         ctx.qry.repo = xstrdup(argv[i] + 7);
 958                 } else if (starts_with(argv[i], "--page=")) {
 959                         ctx.qry.page = xstrdup(argv[i] + 7);
 960                 } else if (starts_with(argv[i], "--head=")) {
 961                         ctx.qry.head = xstrdup(argv[i] + 7);
 962                         ctx.qry.has_symref = 1;
 963                 } else if (starts_with(argv[i], "--sha1=")) {
 964                         ctx.qry.sha1 = xstrdup(argv[i] + 7);
 965                         ctx.qry.has_sha1 = 1;
 966                 } else if (starts_with(argv[i], "--ofs=")) {
 967                         ctx.qry.ofs = atoi(argv[i] + 6);
 968                 } else if (starts_with(argv[i], "--scan-tree=") ||
 969                            starts_with(argv[i], "--scan-path=")) {
 970                         /*
 971                          * HACK: The global snapshot bit mask defines the set
 972                          * of allowed snapshot formats, but the config file
 973                          * hasn't been parsed yet so the mask is currently 0.
 974                          * By setting all bits high before scanning we make
 975                          * sure that any in-repo cgitrc snapshot setting is
 976                          * respected by scan_tree().
 977                          *
 978                          * NOTE: We assume that there aren't more than 8
 979                          * different snapshot formats supported by cgit...
 980                          */
 981                         ctx.cfg.snapshots = 0xFF;
 982                         scan++;
 983                         scan_tree(argv[i] + 12, repo_config);
 984                 }
 985         }
 986         if (scan) {
 987                 qsort(cgit_repolist.repos, cgit_repolist.count,
 988                         sizeof(struct cgit_repo), cmp_repos);
 989                 print_repolist(stdout, &cgit_repolist, 0);
 990                 exit(0);
 991         }
 992 }
 993
 994 static int calc_ttl()
 995 {
 996         if (!ctx.repo)
 997                 return ctx.cfg.cache_root_ttl;
 998
 999         if (!ctx.qry.page)
1000                 return ctx.cfg.cache_repo_ttl;
1001
1002         if (!strcmp(ctx.qry.page, "about"))
1003                 return ctx.cfg.cache_about_ttl;
1004
1005         if (!strcmp(ctx.qry.page, "snapshot"))
1006                 return ctx.cfg.cache_snapshot_ttl;
1007
1008         if (ctx.qry.has_sha1)
1009                 return ctx.cfg.cache_static_ttl;
1010
1011         if (ctx.qry.has_symref)
1012                 return ctx.cfg.cache_dynamic_ttl;
1013
1014         return ctx.cfg.cache_repo_ttl;
1015 }
1016
1017 int main(int argc, const char **argv)
1018 {
1019         const char *path;
1020         int err, ttl;
1021
1022         cgit_init_filters();
1023         atexit(cgit_cleanup_filters);
1024
1025         prepare_context();
1026         cgit_repolist.length = 0;
1027         cgit_repolist.count = 0;
1028         cgit_repolist.repos = NULL;
1029
1030         cgit_parse_args(argc, argv);
1031         parse_configfile(expand_macros(ctx.env.cgit_config), config_cb);
1032         ctx.repo = NULL;
1033         http_parse_querystring(ctx.qry.raw, querystring_cb);
1034
1035         /* If virtual-root isn't specified in cgitrc, lets pretend
1036          * that virtual-root equals SCRIPT_NAME, minus any possibly
1037          * trailing slashes.
1038          */
1039         if (!ctx.cfg.virtual_root && ctx.cfg.script_name)
1040                 ctx.cfg.virtual_root = ensure_end(ctx.cfg.script_name, '/');
1041
1042         /* If no url parameter is specified on the querystring, lets
1043          * use PATH_INFO as url. This allows cgit to work with virtual
1044          * urls without the need for rewriterules in the webserver (as
1045          * long as PATH_INFO is included in the cache lookup key).
1046          */
1047         path = ctx.env.path_info;
1048         if (!ctx.qry.url && path) {
1049                 if (path[0] == '/')
1050                         path++;
1051                 ctx.qry.url = xstrdup(path);
1052                 if (ctx.qry.raw) {
1053                         char *newqry = fmtalloc("%s?%s", path, ctx.qry.raw);
1054                         free(ctx.qry.raw);
1055                         ctx.qry.raw = newqry;
1056                 } else
1057                         ctx.qry.raw = xstrdup(ctx.qry.url);
1058                 cgit_parse_url(ctx.qry.url);
1059         }
1060
1061         /* Before we go any further, we set ctx.env.authenticated by checking to see
1062          * if the supplied cookie is valid. All cookies are valid if there is no
1063          * auth_filter. If there is an auth_filter, the filter decides. */
1064         authenticate_cookie();
1065
1066         ttl = calc_ttl();
1067         if (ttl < 0)
1068                 ctx.page.expires += 10 * 365 * 24 * 60 * 60; /* 10 years */
1069         else
1070                 ctx.page.expires += ttl * 60;
1071         if (!ctx.env.authenticated || (ctx.env.request_method && !strcmp(ctx.env.request_method, "HEAD")))
1072                 ctx.cfg.nocache = 1;
1073         if (ctx.cfg.nocache)
1074                 ctx.cfg.cache_size = 0;
1075         err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
1076                             ctx.qry.raw, ttl, process_request);
1077         cgit_cleanup_filters();
1078         if (err)
1079                 cgit_print_error("Error processing page: %s (%d)",
1080                                  strerror(err), err);
1081         return err;
1082 }