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Diffstat (limited to 'modules/mappers/mod_vhost_alias.c')
| -rw-r--r-- | modules/mappers/mod_vhost_alias.c | 457 |
1 files changed, 457 insertions, 0 deletions
diff --git a/modules/mappers/mod_vhost_alias.c b/modules/mappers/mod_vhost_alias.c new file mode 100644 index 0000000..b1e5bfb --- /dev/null +++ b/modules/mappers/mod_vhost_alias.c @@ -0,0 +1,457 @@ +/* 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_vhost_alias.c: support for dynamically configured mass virtual hosting + * + * Copyright (c) 1998-1999 Demon Internet Ltd. + * + * This software was submitted by Demon Internet to the Apache Software Foundation + * in May 1999. Future revisions and derivatives of this source code + * must acknowledge Demon Internet as the original contributor of + * this module. All other licensing and usage conditions are those + * of the Apache Software Foundation. + * + * Originally written by Tony Finch <fanf@demon.net> <dot@dotat.at>. + * + * Implementation ideas were taken from mod_alias.c. The overall + * concept is derived from the OVERRIDE_DOC_ROOT/OVERRIDE_CGIDIR + * patch to Apache 1.3b3 and a similar feature in Demon's thttpd, + * both written by James Grinter <jrg@blodwen.demon.co.uk>. + */ + +#include "apr.h" +#include "apr_strings.h" +#include "ap_hooks.h" +#include "apr_lib.h" + +#define APR_WANT_STRFUNC +#include "apr_want.h" + +#include "httpd.h" +#include "http_config.h" +#include "http_core.h" +#include "http_request.h" /* for ap_hook_translate_name */ + + +module AP_MODULE_DECLARE_DATA vhost_alias_module; + + +/* + * basic configuration things + * we abbreviate "mod_vhost_alias" to "mva" for shorter names + */ + +typedef enum { + VHOST_ALIAS_UNSET, VHOST_ALIAS_NONE, VHOST_ALIAS_NAME, VHOST_ALIAS_IP +} mva_mode_e; + +/* + * Per-server module config record. + */ +typedef struct mva_sconf_t { + const char *doc_root; + const char *cgi_root; + mva_mode_e doc_root_mode; + mva_mode_e cgi_root_mode; +} mva_sconf_t; + +static void *mva_create_server_config(apr_pool_t *p, server_rec *s) +{ + mva_sconf_t *conf; + + conf = (mva_sconf_t *) apr_pcalloc(p, sizeof(mva_sconf_t)); + conf->doc_root = NULL; + conf->cgi_root = NULL; + conf->doc_root_mode = VHOST_ALIAS_UNSET; + conf->cgi_root_mode = VHOST_ALIAS_UNSET; + return conf; +} + +static void *mva_merge_server_config(apr_pool_t *p, void *parentv, void *childv) +{ + mva_sconf_t *parent = (mva_sconf_t *) parentv; + mva_sconf_t *child = (mva_sconf_t *) childv; + mva_sconf_t *conf; + + conf = (mva_sconf_t *) apr_pcalloc(p, sizeof(*conf)); + if (child->doc_root_mode == VHOST_ALIAS_UNSET) { + conf->doc_root_mode = parent->doc_root_mode; + conf->doc_root = parent->doc_root; + } + else { + conf->doc_root_mode = child->doc_root_mode; + conf->doc_root = child->doc_root; + } + if (child->cgi_root_mode == VHOST_ALIAS_UNSET) { + conf->cgi_root_mode = parent->cgi_root_mode; + conf->cgi_root = parent->cgi_root; + } + else { + conf->cgi_root_mode = child->cgi_root_mode; + conf->cgi_root = child->cgi_root; + } + return conf; +} + + +/* + * These are just here to tell us what vhost_alias_set should do. + * We don't put anything into them; we just use the cell addresses. + */ +static int vhost_alias_set_doc_root_ip, + vhost_alias_set_cgi_root_ip, + vhost_alias_set_doc_root_name, + vhost_alias_set_cgi_root_name; + +static const char *vhost_alias_set(cmd_parms *cmd, void *dummy, const char *map) +{ + mva_sconf_t *conf; + mva_mode_e mode, *pmode; + const char **pmap; + const char *p; + + conf = (mva_sconf_t *) ap_get_module_config(cmd->server->module_config, + &vhost_alias_module); + /* there ought to be a better way of doing this */ + if (&vhost_alias_set_doc_root_ip == cmd->info) { + mode = VHOST_ALIAS_IP; + pmap = &conf->doc_root; + pmode = &conf->doc_root_mode; + } + else if (&vhost_alias_set_cgi_root_ip == cmd->info) { + mode = VHOST_ALIAS_IP; + pmap = &conf->cgi_root; + pmode = &conf->cgi_root_mode; + } + else if (&vhost_alias_set_doc_root_name == cmd->info) { + mode = VHOST_ALIAS_NAME; + pmap = &conf->doc_root; + pmode = &conf->doc_root_mode; + } + else if (&vhost_alias_set_cgi_root_name == cmd->info) { + mode = VHOST_ALIAS_NAME; + pmap = &conf->cgi_root; + pmode = &conf->cgi_root_mode; + } + else { + return "INTERNAL ERROR: unknown command info"; + } + + if (!ap_os_is_path_absolute(cmd->pool, map)) { + if (ap_cstr_casecmp(map, "none")) { + return "format string must be an absolute path, or 'none'"; + } + *pmap = NULL; + *pmode = VHOST_ALIAS_NONE; + return NULL; + } + + /* sanity check */ + p = map; + while (*p != '\0') { + if (*p++ != '%') { + continue; + } + /* we just found a '%' */ + if (*p == 'p' || *p == '%') { + ++p; + continue; + } + /* optional dash */ + if (*p == '-') { + ++p; + } + /* digit N */ + if (apr_isdigit(*p)) { + ++p; + } + else { + return "syntax error in format string"; + } + /* optional plus */ + if (*p == '+') { + ++p; + } + /* do we end here? */ + if (*p != '.') { + continue; + } + ++p; + /* optional dash */ + if (*p == '-') { + ++p; + } + /* digit M */ + if (apr_isdigit(*p)) { + ++p; + } + else { + return "syntax error in format string"; + } + /* optional plus */ + if (*p == '+') { + ++p; + } + } + *pmap = map; + *pmode = mode; + return NULL; +} + +static const command_rec mva_commands[] = +{ + AP_INIT_TAKE1("VirtualScriptAlias", vhost_alias_set, + &vhost_alias_set_cgi_root_name, RSRC_CONF, + "how to create a ScriptAlias based on the host"), + AP_INIT_TAKE1("VirtualDocumentRoot", vhost_alias_set, + &vhost_alias_set_doc_root_name, RSRC_CONF, + "how to create the DocumentRoot based on the host"), + AP_INIT_TAKE1("VirtualScriptAliasIP", vhost_alias_set, + &vhost_alias_set_cgi_root_ip, RSRC_CONF, + "how to create a ScriptAlias based on the host"), + AP_INIT_TAKE1("VirtualDocumentRootIP", vhost_alias_set, + &vhost_alias_set_doc_root_ip, RSRC_CONF, + "how to create the DocumentRoot based on the host"), + { NULL } +}; + + +/* + * This really wants to be a nested function + * but C is too feeble to support them. + */ +static APR_INLINE void vhost_alias_checkspace(request_rec *r, char *buf, + char **pdest, int size) +{ + /* XXX: what if size > HUGE_STRING_LEN? */ + if (*pdest + size > buf + HUGE_STRING_LEN) { + **pdest = '\0'; + if (r->filename) { + r->filename = apr_pstrcat(r->pool, r->filename, buf, NULL); + } + else { + r->filename = apr_pstrdup(r->pool, buf); + } + *pdest = buf; + } +} + +static void vhost_alias_interpolate(request_rec *r, const char *name, + const char *map, const char *uri) +{ + /* 0..9 9..0 */ + enum { MAXDOTS = 19 }; + const char *dots[MAXDOTS+1]; + int ndots; + + char buf[HUGE_STRING_LEN]; + char *dest; + const char *docroot; + + int N, M, Np, Mp, Nd, Md; + const char *start, *end; + + const char *p; + + ndots = 0; + dots[ndots++] = name-1; /* slightly naughty */ + for (p = name; *p; ++p) { + if (*p == '.' && ndots < MAXDOTS) { + dots[ndots++] = p; + } + } + dots[ndots] = p; + + r->filename = NULL; + + dest = buf; + while (*map) { + if (*map != '%') { + /* normal characters */ + vhost_alias_checkspace(r, buf, &dest, 1); + *dest++ = *map++; + continue; + } + /* we are in a format specifier */ + ++map; + /* %% -> % */ + if (*map == '%') { + ++map; + vhost_alias_checkspace(r, buf, &dest, 1); + *dest++ = '%'; + continue; + } + /* port number */ + if (*map == 'p') { + ++map; + /* no. of decimal digits in a short plus one */ + vhost_alias_checkspace(r, buf, &dest, 7); + dest += apr_snprintf(dest, 7, "%d", ap_get_server_port(r)); + continue; + } + /* deal with %-N+.-M+ -- syntax is already checked */ + M = 0; /* value */ + Np = Mp = 0; /* is there a plus? */ + Nd = Md = 0; /* is there a dash? */ + if (*map == '-') ++map, Nd = 1; + N = *map++ - '0'; + if (*map == '+') ++map, Np = 1; + if (*map == '.') { + ++map; + if (*map == '-') { + ++map, Md = 1; + } + M = *map++ - '0'; + if (*map == '+') { + ++map, Mp = 1; + } + } + /* note that N and M are one-based indices, not zero-based */ + start = dots[0]+1; /* ptr to the first character */ + end = dots[ndots]; /* ptr to the character after the last one */ + if (N != 0) { + if (N > ndots) { + start = "_"; + end = start+1; + } + else if (!Nd) { + start = dots[N-1]+1; + if (!Np) { + end = dots[N]; + } + } + else { + if (!Np) { + start = dots[ndots-N]+1; + } + end = dots[ndots-N+1]; + } + } + if (M != 0) { + if (M > end - start) { + start = "_"; + end = start+1; + } + else if (!Md) { + start = start+M-1; + if (!Mp) { + end = start+1; + } + } + else { + if (!Mp) { + start = end-M; + } + end = end-M+1; + } + } + vhost_alias_checkspace(r, buf, &dest, end - start); + for (p = start; p < end; ++p) { + *dest++ = apr_tolower(*p); + } + } + /* no double slashes */ + if (dest - buf > 0 && dest[-1] == '/') { + --dest; + } + *dest = '\0'; + + if (r->filename) + docroot = apr_pstrcat(r->pool, r->filename, buf, NULL); + else + docroot = apr_pstrdup(r->pool, buf); + r->filename = apr_pstrcat(r->pool, docroot, uri, NULL); + ap_set_context_info(r, NULL, docroot); + ap_set_document_root(r, docroot); +} + +static int mva_translate(request_rec *r) +{ + mva_sconf_t *conf; + const char *name, *map, *uri; + mva_mode_e mode; + const char *cgi; + + conf = (mva_sconf_t *) ap_get_module_config(r->server->module_config, + &vhost_alias_module); + cgi = NULL; + if (conf->cgi_root) { + cgi = strstr(r->uri, "cgi-bin/"); + if (cgi && (cgi != r->uri + strspn(r->uri, "/"))) { + cgi = NULL; + } + } + if (cgi) { + mode = conf->cgi_root_mode; + map = conf->cgi_root; + uri = cgi + strlen("cgi-bin"); + } + else if (r->uri[0] == '/') { + mode = conf->doc_root_mode; + map = conf->doc_root; + uri = r->uri; + } + else { + return DECLINED; + } + + if (mode == VHOST_ALIAS_NAME) { + name = ap_get_server_name(r); + } + else if (mode == VHOST_ALIAS_IP) { + name = r->connection->local_ip; + } + else { + return DECLINED; + } + + /* ### There is an optimization available here to determine the + * absolute portion of the path from the server config phase, + * through the first % segment, and note that portion of the path + * canonical_path buffer. + */ + r->canonical_filename = ""; + vhost_alias_interpolate(r, name, map, uri); + + if (cgi) { + /* see is_scriptaliased() in mod_cgi */ + r->handler = "cgi-script"; + apr_table_setn(r->notes, "alias-forced-type", r->handler); + ap_set_context_info(r, "/cgi-bin", NULL); + } + + return OK; +} + +static void register_hooks(apr_pool_t *p) +{ + static const char * const aszPre[]={ "mod_alias.c","mod_userdir.c",NULL }; + + ap_hook_translate_name(mva_translate, aszPre, NULL, APR_HOOK_MIDDLE); +} + +AP_DECLARE_MODULE(vhost_alias) = +{ + STANDARD20_MODULE_STUFF, + NULL, /* dir config creater */ + NULL, /* dir merger --- default is to override */ + mva_create_server_config, /* server config */ + mva_merge_server_config, /* merge server configs */ + mva_commands, /* command apr_table_t */ + register_hooks /* register hooks */ +}; + |