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Diffstat (limited to 'APACHE_1_3_42/src/modules/standard/mod_cern_meta.c')
| -rw-r--r-- | APACHE_1_3_42/src/modules/standard/mod_cern_meta.c | 357 |
1 files changed, 357 insertions, 0 deletions
diff --git a/APACHE_1_3_42/src/modules/standard/mod_cern_meta.c b/APACHE_1_3_42/src/modules/standard/mod_cern_meta.c new file mode 100644 index 0000000000..63d4de4142 --- /dev/null +++ b/APACHE_1_3_42/src/modules/standard/mod_cern_meta.c @@ -0,0 +1,357 @@ +/* Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/* + * mod_cern_meta.c + * version 0.1.0 + * status beta + * + * Andrew Wilson <Andrew.Wilson@cm.cf.ac.uk> 25.Jan.96 + * + * *** IMPORTANT *** + * This version of mod_cern_meta.c controls Meta File behaviour on a + * per-directory basis. Previous versions of the module defined behaviour + * on a per-server basis. The upshot is that you'll need to revisit your + * configuration files in order to make use of the new module. + * *** + * + * Emulate the CERN HTTPD Meta file semantics. Meta files are HTTP + * headers that can be output in addition to the normal range of + * headers for each file accessed. They appear rather like the Apache + * .asis files, and are able to provide a crude way of influencing + * the Expires: header, as well as providing other curiosities. + * There are many ways to manage meta information, this one was + * chosen because there is already a large number of CERN users + * who can exploit this module. It should be noted that there are probably + * more sensitive ways of managing the Expires: header specifically. + * + * The module obeys the following directives, which can appear + * in the server's .conf files and in .htaccess files. + * + * MetaFiles <on|off> + * + * turns on|off meta file processing for any directory. + * Default value is off + * + * # turn on MetaFiles in this directory + * MetaFiles on + * + * MetaDir <directory name> + * + * specifies the name of the directory in which Apache can find + * meta information files. The directory is usually a 'hidden' + * subdirectory of the directory that contains the file being + * accessed. eg: + * + * # .meta files are in the *same* directory as the + * # file being accessed + * MetaDir . + * + * the default is to look in a '.web' subdirectory. This is the + * same as for CERN 3.+ webservers and behaviour is the same as + * for the directive: + * + * MetaDir .web + * + * MetaSuffix <meta file suffix> + * + * specifies the file name suffix for the file containing the + * meta information. eg: + * + * # our meta files are suffixed with '.cern_meta' + * MetaSuffix .cern_meta + * + * the default is to look for files with the suffix '.meta'. This + * behaviour is the same as for the directive: + * + * MetaSuffix .meta + * + * When accessing the file + * + * DOCUMENT_ROOT/somedir/index.html + * + * this module will look for the file + * + * DOCUMENT_ROOT/somedir/.web/index.html.meta + * + * and will use its contents to generate additional MIME header + * information. + * + * For more information on the CERN Meta file semantics see: + * + * http://www.w3.org/hypertext/WWW/Daemon/User/Config/General.html#MetaDir + * + * Change-log: + * 29.Jan.96 pfopen/pfclose instead of fopen/fclose + * DECLINE when real file not found, we may be checking each + * of the index.html/index.shtml/index.htm variants and don't + * need to report missing ones as spurious errors. + * 31.Jan.96 log_error reports about a malformed .meta file, rather + * than a script error. + * 20.Jun.96 MetaFiles <on|off> default off, added, so that module + * can be configured per-directory. Prior to this the module + * was running for each request anywhere on the server, naughty.. + * 29.Jun.96 All directives made per-directory. + */ + +#include "httpd.h" +#include "http_config.h" +#ifndef NETWARE +#include <sys/types.h> +#endif +#include <sys/stat.h> +#include "util_script.h" +#include "http_log.h" +#include "http_request.h" + +#define DIR_CMD_PERMS OR_INDEXES + +#define DEFAULT_METADIR ".web" +#define DEFAULT_METASUFFIX ".meta" +#define DEFAULT_METAFILES 0 + +module MODULE_VAR_EXPORT cern_meta_module; + +typedef struct { + char *metadir; + char *metasuffix; + int metafiles; +} cern_meta_dir_config; + +static void *create_cern_meta_dir_config(pool *p, char *dummy) +{ + cern_meta_dir_config *new = + (cern_meta_dir_config *) ap_palloc(p, sizeof(cern_meta_dir_config)); + + new->metadir = NULL; + new->metasuffix = NULL; + new->metafiles = DEFAULT_METAFILES; + + return new; +} + +static void *merge_cern_meta_dir_configs(pool *p, void *basev, void *addv) +{ + cern_meta_dir_config *base = (cern_meta_dir_config *) basev; + cern_meta_dir_config *add = (cern_meta_dir_config *) addv; + cern_meta_dir_config *new = + (cern_meta_dir_config *) ap_palloc(p, sizeof(cern_meta_dir_config)); + + new->metadir = add->metadir ? add->metadir : base->metadir; + new->metasuffix = add->metasuffix ? add->metasuffix : base->metasuffix; + new->metafiles = add->metafiles; + + return new; +} + +static const char *set_metadir(cmd_parms *parms, cern_meta_dir_config * dconf, char *arg) +{ + dconf->metadir = arg; + return NULL; +} + +static const char *set_metasuffix(cmd_parms *parms, cern_meta_dir_config * dconf, char *arg) +{ + dconf->metasuffix = arg; + return NULL; +} + +static const char *set_metafiles(cmd_parms *parms, cern_meta_dir_config * dconf, int arg) +{ + dconf->metafiles = arg; + return NULL; +} + + +static const command_rec cern_meta_cmds[] = +{ + {"MetaFiles", set_metafiles, NULL, DIR_CMD_PERMS, FLAG, + "Limited to 'on' or 'off'"}, + {"MetaDir", set_metadir, NULL, DIR_CMD_PERMS, TAKE1, + "the name of the directory containing meta files"}, + {"MetaSuffix", set_metasuffix, NULL, DIR_CMD_PERMS, TAKE1, + "the filename suffix for meta files"}, + {NULL} +}; + +/* XXX: this is very similar to ap_scan_script_header_err_core... + * are the differences deliberate, or just a result of bit rot? + */ +static int scan_meta_file(request_rec *r, FILE *f) +{ + char w[MAX_STRING_LEN]; + char *l; + int p; + table *tmp_headers; + + tmp_headers = ap_make_table(r->pool, 5); + while (fgets(w, MAX_STRING_LEN - 1, f) != NULL) { + + /* Delete terminal (CR?)LF */ + + p = strlen(w); + if (p > 0 && w[p - 1] == '\n') { + if (p > 1 && w[p - 2] == '\015') + w[p - 2] = '\0'; + else + w[p - 1] = '\0'; + } + + if (w[0] == '\0') { + return OK; + } + + /* if we see a bogus header don't ignore it. Shout and scream */ + + if (!(l = strchr(w, ':'))) { + ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r, + "malformed header in meta file: %s", r->filename); + return SERVER_ERROR; + } + + *l++ = '\0'; + while (*l && ap_isspace(*l)) + ++l; + + if (!strcasecmp(w, "Content-type")) { + char *tmp; + /* Nuke trailing whitespace */ + + char *endp = l + strlen(l) - 1; + while (endp > l && ap_isspace(*endp)) + *endp-- = '\0'; + + tmp = ap_pstrdup(r->pool, l); + ap_content_type_tolower(tmp); + r->content_type = tmp; + } + else if (!strcasecmp(w, "Status")) { + sscanf(l, "%d", &r->status); + r->status_line = ap_pstrdup(r->pool, l); + } + else { + ap_table_set(tmp_headers, w, l); + } + } + ap_overlap_tables(r->headers_out, tmp_headers, AP_OVERLAP_TABLES_SET); + return OK; +} + +static int add_cern_meta_data(request_rec *r) +{ + char *metafilename; + char *last_slash; + char *real_file; + char *scrap_book; + FILE *f; + cern_meta_dir_config *dconf; + int rv; + request_rec *rr; + + dconf = ap_get_module_config(r->per_dir_config, &cern_meta_module); + + if (!dconf->metafiles) { + return DECLINED; + }; + + /* if ./.web/$1.meta exists then output 'asis' */ + + if (r->finfo.st_mode == 0) { + return DECLINED; + }; + + /* is this a directory? */ + if (S_ISDIR(r->finfo.st_mode) || r->uri[strlen(r->uri) - 1] == '/') { + return DECLINED; + }; + + /* what directory is this file in? */ + scrap_book = ap_pstrdup(r->pool, r->filename); + /* skip leading slash, recovered in later processing */ + scrap_book++; + last_slash = strrchr(scrap_book, '/'); + if (last_slash != NULL) { + /* skip over last slash */ + real_file = last_slash; + real_file++; + *last_slash = '\0'; + } + else { + /* no last slash, buh?! */ + ap_log_rerror(APLOG_MARK, APLOG_NOERRNO|APLOG_ERR, r, + "internal error in mod_cern_meta: %s", r->filename); + /* should really barf, but hey, let's be friends... */ + return DECLINED; + }; + + metafilename = ap_pstrcat(r->pool, "/", scrap_book, "/", + dconf->metadir ? dconf->metadir : DEFAULT_METADIR, + "/", real_file, + dconf->metasuffix ? dconf->metasuffix : DEFAULT_METASUFFIX, + NULL); + + /* XXX: it sucks to require this subrequest to complete, because this + * means people must leave their meta files accessible to the world. + * A better solution might be a "safe open" feature of pfopen to avoid + * pipes, symlinks, and crap like that. + */ + rr = ap_sub_req_lookup_file(metafilename, r); + if (rr->status != HTTP_OK) { + ap_destroy_sub_req(rr); + return DECLINED; + } + ap_destroy_sub_req(rr); + + f = ap_pfopen(r->pool, metafilename, "r"); + if (f == NULL) { + if (errno == ENOENT) { + return DECLINED; + } + ap_log_rerror(APLOG_MARK, APLOG_ERR, r, + "meta file permissions deny server access: %s", metafilename); + return FORBIDDEN; + }; + + /* read the headers in */ + rv = scan_meta_file(r, f); + ap_pfclose(r->pool, f); + + return rv; +} + +module MODULE_VAR_EXPORT cern_meta_module = +{ + STANDARD_MODULE_STUFF, + NULL, /* initializer */ + create_cern_meta_dir_config, /* dir config creater */ + merge_cern_meta_dir_configs, /* dir merger --- default is to override */ + NULL, /* server config */ + NULL, /* merge server configs */ + cern_meta_cmds, /* command table */ + NULL, /* handlers */ + NULL, /* filename translation */ + NULL, /* check_user_id */ + NULL, /* check auth */ + NULL, /* check access */ + NULL, /* type_checker */ + add_cern_meta_data, /* fixups */ + NULL, /* logger */ + NULL, /* header parser */ + NULL, /* child_init */ + NULL, /* child_exit */ + NULL /* post read-request */ +}; + |