lighttpd1.4/src/mod_simple_vhost.c

#include <ctype.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>

#include "base.h"
#include "log.h"
#include "buffer.h"
#include "stat_cache.h"

#include "plugin.h"

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

typedef struct {
	buffer *server_root;
	buffer *default_host;
	buffer *document_root;
	
	buffer *docroot_cache_key;
	buffer *docroot_cache_value;
	buffer *docroot_cache_servername;
} plugin_config;

typedef struct {
	PLUGIN_DATA;
	
	buffer *doc_root;
	
	plugin_config **config_storage;
	plugin_config conf; 
} plugin_data;

INIT_FUNC(mod_simple_vhost_init) {
	plugin_data *p;
	
	p = calloc(1, sizeof(*p));
	
	p->doc_root = buffer_init();
	
	return p;
}

FREE_FUNC(mod_simple_vhost_free) {
	plugin_data *p = p_d;
	
	UNUSED(srv);

	if (!p) return HANDLER_GO_ON;
	
	if (p->config_storage) {
		size_t i;
		for (i = 0; i < srv->config_context->used; i++) {
			plugin_config *s = p->config_storage[i];
			
			buffer_free(s->document_root);
			buffer_free(s->default_host);
			buffer_free(s->server_root);
			
			buffer_free(s->docroot_cache_key);
			buffer_free(s->docroot_cache_value);
			buffer_free(s->docroot_cache_servername);
			
			free(s);
		}
	
		free(p->config_storage);
	}
	
	buffer_free(p->doc_root);
	
	free(p);
	
	return HANDLER_GO_ON;
}

SETDEFAULTS_FUNC(mod_simple_vhost_set_defaults) {
	plugin_data *p = p_d;
	size_t i;
	
	config_values_t cv[] = { 
		{ "simple-vhost.server-root",       NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
		{ "simple-vhost.default-host",      NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
		{ "simple-vhost.document-root",     NULL, T_CONFIG_STRING, T_CONFIG_SCOPE_CONNECTION },
		{ NULL,                             NULL, T_CONFIG_UNSET, T_CONFIG_SCOPE_UNSET }
	};
	
	if (!p) return HANDLER_ERROR;
	
	p->config_storage = malloc(srv->config_context->used * sizeof(specific_config *));
	
	for (i = 0; i < srv->config_context->used; i++) {
		plugin_config *s;
		
		s = calloc(1, sizeof(plugin_config));
		
		s->server_root = buffer_init();
		s->default_host = buffer_init();
		s->document_root = buffer_init();
		
		s->docroot_cache_key = buffer_init();
		s->docroot_cache_value = buffer_init();
		s->docroot_cache_servername = buffer_init();
		
		cv[0].destination = s->server_root;
		cv[1].destination = s->default_host;
		cv[2].destination = s->document_root;
		
		p->config_storage[i] = s;
		
		if (0 != config_insert_values_global(srv, ((data_config *)srv->config_context->data[i])->value, cv)) {
			return HANDLER_ERROR;
		}
	}
	
	return HANDLER_GO_ON;
}

static int build_doc_root(server *srv, connection *con, plugin_data *p, buffer *out, buffer *host) {
	stat_cache_entry *sce = NULL;
	
	buffer_prepare_copy(out, 128);

	if (p->conf.server_root->used) {
		buffer_copy_string_buffer(out, p->conf.server_root);
		
		if (host->used) {
			/* a hostname has to start with a alpha-numerical character
			 * and must not contain a slash "/"
			 */
			char *dp;
			
			BUFFER_APPEND_SLASH(out);
			
			if (NULL == (dp = strchr(host->ptr, ':'))) {
				buffer_append_string_buffer(out, host);
			} else {
				buffer_append_string_len(out, host->ptr, dp - host->ptr);
			}
		}
		BUFFER_APPEND_SLASH(out);
		
		if (p->conf.document_root->used > 2 && p->conf.document_root->ptr[0] == '/') {
			buffer_append_string_len(out, p->conf.document_root->ptr + 1, p->conf.document_root->used - 2);
		} else {
			buffer_append_string_buffer(out, p->conf.document_root);
			BUFFER_APPEND_SLASH(out);
		}
	} else {
		buffer_copy_string_buffer(out, con->conf.document_root);
		BUFFER_APPEND_SLASH(out);
	}
	
	if (HANDLER_ERROR == stat_cache_get_entry(srv, con, out, &sce)) {
		log_error_write(srv, __FILE__, __LINE__, "sb",
				strerror(errno), out);
		return -1;
	} else if (!S_ISDIR(sce->st.st_mode)) {
		return -1;
	}
	
	return 0;
}


#define PATCH(x) \
	p->conf.x = s->x;
static int mod_simple_vhost_patch_connection(server *srv, connection *con, plugin_data *p, const char *stage, size_t stage_len) {
	size_t i, j;
	
	/* skip the first, the global context */
	for (i = 1; i < srv->config_context->used; i++) {
		data_config *dc = (data_config *)srv->config_context->data[i];
		plugin_config *s = p->config_storage[i];
		
		/* not our stage */
		if (!buffer_is_equal_string(dc->comp_key, stage, stage_len)) continue;
		
		/* condition didn't match */
		if (!config_check_cond(srv, con, dc)) continue;
		
		/* merge config */
		for (j = 0; j < dc->value->used; j++) {
			data_unset *du = dc->value->data[j];
			
			if (buffer_is_equal_string(du->key, CONST_STR_LEN("simple-vhost.server-root"))) {
				PATCH(server_root);
				PATCH(docroot_cache_key);
				PATCH(docroot_cache_value);
				PATCH(docroot_cache_servername);
			} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("simple-vhost.default-host"))) {
				PATCH(default_host);
			} else if (buffer_is_equal_string(du->key, CONST_STR_LEN("simple-vhost.document-root"))) {
				PATCH(document_root);
			}
		}
	}
	
	return 0;
}

static int mod_simple_vhost_setup_connection(server *srv, connection *con, plugin_data *p) {
	plugin_config *s = p->config_storage[0];
	UNUSED(srv);
	UNUSED(con);
		
	PATCH(server_root);
	PATCH(default_host);
	PATCH(document_root);
	
	PATCH(docroot_cache_key);
	PATCH(docroot_cache_value);
	PATCH(docroot_cache_servername);
	
	return 0;
}
#undef PATCH

static handler_t mod_simple_vhost_docroot(server *srv, connection *con, void *p_data) {
	plugin_data *p = p_data;
	size_t i;

	/*
	 * cache the last successfull translation from hostname (authority) to docroot
	 * - this saves us a stat() call
	 * 
	 */
	
	mod_simple_vhost_setup_connection(srv, con, p);
	for (i = 0; i < srv->config_patches->used; i++) {
		buffer *patch = srv->config_patches->ptr[i];
		
		mod_simple_vhost_patch_connection(srv, con, p, CONST_BUF_LEN(patch));
	}
	
	if (p->conf.docroot_cache_key->used && 
	    con->uri.authority->used &&
	    buffer_is_equal(p->conf.docroot_cache_key, con->uri.authority)) {
		/* cache hit */
		buffer_copy_string_buffer(con->physical.doc_root, p->conf.docroot_cache_value);
		buffer_copy_string_buffer(con->server_name,       p->conf.docroot_cache_servername);
	} else {
		/* build document-root */
		if ((con->uri.authority->used == 0) ||
		    build_doc_root(srv, con, p, p->doc_root, con->uri.authority)) {
			/* not found, fallback the default-host */
			if (build_doc_root(srv, con, p, 
					   p->doc_root, 
					   p->conf.default_host)) {
				return HANDLER_GO_ON;
			} else {
				buffer_copy_string_buffer(con->server_name, p->conf.default_host);
			}
		} else {
			buffer_copy_string_buffer(con->server_name, con->uri.authority);
		}
		
		/* copy to cache */
		buffer_copy_string_buffer(p->conf.docroot_cache_key,        con->uri.authority);
		buffer_copy_string_buffer(p->conf.docroot_cache_value,      p->doc_root);
		buffer_copy_string_buffer(p->conf.docroot_cache_servername, con->server_name);
		
		buffer_copy_string_buffer(con->physical.doc_root, p->doc_root);
	}
	
	return HANDLER_GO_ON;
}


int mod_simple_vhost_plugin_init(plugin *p) {
	p->version     = LIGHTTPD_VERSION_ID;
	p->name        = buffer_init_string("simple_vhost");
	
	p->init        = mod_simple_vhost_init;
	p->set_defaults = mod_simple_vhost_set_defaults;
	p->handle_docroot  = mod_simple_vhost_docroot;
	p->cleanup     = mod_simple_vhost_free;
	
	p->data        = NULL;
	
	return 0;
}