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