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authorDaniel Wagner <daniel.wagner@bmw-carit.de>2011-01-26 09:50:29 +0100
committerMarcel Holtmann <marcel@holtmann.org>2011-01-26 09:55:18 +0100
commit01694dcca9cae3efa643126849e068fb2029c6b4 (patch)
tree15abd9f63d3f37e1133a91d45eb20ea08c9596d3 /plugins
parentcdbacb918f7ec9a8562da4153173b80994e9a40c (diff)
downloadconnman-01694dcca9cae3efa643126849e068fb2029c6b4.tar.gz
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dnsproxy: Move from plugins to core
Diffstat (limited to 'plugins')
-rw-r--r--plugins/dnsproxy.c1517
1 files changed, 0 insertions, 1517 deletions
diff --git a/plugins/dnsproxy.c b/plugins/dnsproxy.c
deleted file mode 100644
index 60b7a394..00000000
--- a/plugins/dnsproxy.c
+++ /dev/null
@@ -1,1517 +0,0 @@
-/*
- *
- * Connection Manager
- *
- * Copyright (C) 2007-2010 Intel Corporation. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
- *
- */
-
-#ifdef HAVE_CONFIG_H
-#include <config.h>
-#endif
-
-#include <errno.h>
-#include <unistd.h>
-#include <string.h>
-#include <stdint.h>
-#include <arpa/inet.h>
-#include <netinet/in.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <netdb.h>
-
-#define CONNMAN_API_SUBJECT_TO_CHANGE
-#include <connman/plugin.h>
-#include <connman/resolver.h>
-#include <connman/notifier.h>
-#include <connman/ondemand.h>
-#include <connman/log.h>
-
-#include <glib.h>
-
-#if __BYTE_ORDER == __LITTLE_ENDIAN
-struct domain_hdr {
- uint16_t id;
- uint8_t rd:1;
- uint8_t tc:1;
- uint8_t aa:1;
- uint8_t opcode:4;
- uint8_t qr:1;
- uint8_t rcode:4;
- uint8_t z:3;
- uint8_t ra:1;
- uint16_t qdcount;
- uint16_t ancount;
- uint16_t nscount;
- uint16_t arcount;
-} __attribute__ ((packed));
-#elif __BYTE_ORDER == __BIG_ENDIAN
-struct domain_hdr {
- uint16_t id;
- uint8_t qr:1;
- uint8_t opcode:4;
- uint8_t aa:1;
- uint8_t tc:1;
- uint8_t rd:1;
- uint8_t ra:1;
- uint8_t z:3;
- uint8_t rcode:4;
- uint16_t qdcount;
- uint16_t ancount;
- uint16_t nscount;
- uint16_t arcount;
-} __attribute__ ((packed));
-#else
-#error "Unknown byte order"
-#endif
-
-struct partial_reply {
- uint16_t len;
- uint16_t received;
- unsigned char buf[];
-};
-
-struct server_data {
- char *interface;
- GList *domains;
- char *server;
- int protocol;
- GIOChannel *channel;
- guint watch;
- guint timeout;
- gboolean enabled;
- gboolean connected;
- struct partial_reply *incoming_reply;
-};
-
-struct request_data {
- union {
- struct sockaddr_in6 __sin6; /* Only for the length */
- struct sockaddr sa;
- };
- socklen_t sa_len;
- int client_sk;
- int protocol;
- guint16 srcid;
- guint16 dstid;
- guint16 altid;
- guint timeout;
- guint watch;
- guint numserv;
- guint numresp;
- gpointer request;
- gsize request_len;
- gpointer name;
- gpointer resp;
- gsize resplen;
-};
-
-static GSList *server_list = NULL;
-static GSList *request_list = NULL;
-static GSList *request_pending_list = NULL;
-static guint16 request_id = 0x0000;
-
-static GIOChannel *udp_listener_channel = NULL;
-static guint udp_listener_watch = 0;
-static GIOChannel *tcp_listener_channel = NULL;
-static guint tcp_listener_watch = 0;
-
-static int protocol_offset(int protocol)
-{
- switch (protocol) {
- case IPPROTO_UDP:
- return 0;
-
- case IPPROTO_TCP:
- return 2;
-
- default:
- return -EINVAL;
- }
-
-}
-
-static struct request_data *find_request(guint16 id)
-{
- GSList *list;
-
- for (list = request_list; list; list = list->next) {
- struct request_data *req = list->data;
-
- if (req->dstid == id || req->altid == id)
- return req;
- }
-
- return NULL;
-}
-
-static struct server_data *find_server(const char *interface,
- const char *server,
- int protocol)
-{
- GSList *list;
-
- DBG("interface %s server %s", interface, server);
-
- for (list = server_list; list; list = list->next) {
- struct server_data *data = list->data;
-
- if (data->interface == NULL || data->server == NULL)
- continue;
-
- if (g_str_equal(data->interface, interface) == TRUE &&
- g_str_equal(data->server, server) == TRUE &&
- data->protocol == protocol)
- return data;
- }
-
- return NULL;
-}
-
-
-static void send_response(int sk, unsigned char *buf, int len,
- const struct sockaddr *to, socklen_t tolen,
- int protocol)
-{
- struct domain_hdr *hdr;
- int err, offset = protocol_offset(protocol);
-
- DBG("");
-
- if (offset < 0)
- return;
-
- if (len < 12)
- return;
-
- hdr = (void*) (buf + offset);
-
- DBG("id 0x%04x qr %d opcode %d", hdr->id, hdr->qr, hdr->opcode);
-
- hdr->qr = 1;
- hdr->rcode = 2;
-
- hdr->ancount = 0;
- hdr->nscount = 0;
- hdr->arcount = 0;
-
- err = sendto(sk, buf, len, 0, to, tolen);
-}
-
-static gboolean request_timeout(gpointer user_data)
-{
- struct request_data *req = user_data;
-
- DBG("id 0x%04x", req->srcid);
-
- if (req == NULL)
- return FALSE;
-
- request_list = g_slist_remove(request_list, req);
- req->numserv--;
-
- if (req->resplen > 0 && req->resp != NULL) {
- int sk, err;
-
- sk = g_io_channel_unix_get_fd(udp_listener_channel);
-
- err = sendto(sk, req->resp, req->resplen, 0,
- &req->sa, req->sa_len);
- } else if (req->request && req->numserv == 0) {
- struct domain_hdr *hdr;
-
- if (req->protocol == IPPROTO_TCP) {
- hdr = (void *) (req->request + 2);
- hdr->id = req->srcid;
- send_response(req->client_sk, req->request,
- req->request_len, NULL, 0, IPPROTO_TCP);
-
- } else if (req->protocol == IPPROTO_UDP) {
- int sk;
-
- hdr = (void *) (req->request);
- hdr->id = req->srcid;
- sk = g_io_channel_unix_get_fd(udp_listener_channel);
- send_response(sk, req->request, req->request_len,
- &req->sa, req->sa_len, IPPROTO_UDP);
- }
- }
-
- g_free(req->resp);
- g_free(req);
-
- return FALSE;
-}
-
-static int append_query(unsigned char *buf, unsigned int size,
- const char *query, const char *domain)
-{
- unsigned char *ptr = buf;
- char *offset;
-
- DBG("query %s domain %s", query, domain);
-
- offset = (char *) query;
- while (offset != NULL) {
- char *tmp;
-
- tmp = strchr(offset, '.');
- if (tmp == NULL) {
- if (strlen(offset) == 0)
- break;
- *ptr = strlen(offset);
- memcpy(ptr + 1, offset, strlen(offset));
- ptr += strlen(offset) + 1;
- break;
- }
-
- *ptr = tmp - offset;
- memcpy(ptr + 1, offset, tmp - offset);
- ptr += tmp - offset + 1;
-
- offset = tmp + 1;
- }
-
- offset = (char *) domain;
- while (offset != NULL) {
- char *tmp;
-
- tmp = strchr(offset, '.');
- if (tmp == NULL) {
- if (strlen(offset) == 0)
- break;
- *ptr = strlen(offset);
- memcpy(ptr + 1, offset, strlen(offset));
- ptr += strlen(offset) + 1;
- break;
- }
-
- *ptr = tmp - offset;
- memcpy(ptr + 1, offset, tmp - offset);
- ptr += tmp - offset + 1;
-
- offset = tmp + 1;
- }
-
- *ptr++ = 0x00;
-
- return ptr - buf;
-}
-
-static int ns_resolv(struct server_data *server, struct request_data *req,
- gpointer request, gpointer name)
-{
- GList *list;
- int sk, err;
-
- sk = g_io_channel_unix_get_fd(server->channel);
-
- err = send(sk, request, req->request_len, 0);
-
- req->numserv++;
-
- for (list = server->domains; list; list = list->next) {
- char *domain;
- unsigned char alt[1024];
- struct domain_hdr *hdr = (void *) &alt;
- int altlen, domlen, offset;
-
- domain = list->data;
-
- if (domain == NULL)
- continue;
-
- offset = protocol_offset(server->protocol);
- if (offset < 0)
- return offset;
-
- domlen = strlen(domain) + 1;
- if (domlen < 5)
- return -EINVAL;
-
- alt[offset] = req->altid & 0xff;
- alt[offset + 1] = req->altid >> 8;
-
- memcpy(alt + offset + 2, request + offset + 2, 10);
- hdr->qdcount = htons(1);
-
- altlen = append_query(alt + offset + 12, sizeof(alt) - 12,
- name, domain);
- if (altlen < 0)
- return -EINVAL;
-
- altlen += 12;
-
- memcpy(alt + offset + altlen,
- request + offset + altlen - domlen,
- req->request_len - altlen + domlen);
-
- if (server->protocol == IPPROTO_TCP) {
- int req_len = req->request_len + domlen - 1;
-
- alt[0] = (req_len >> 8) & 0xff;
- alt[1] = req_len & 0xff;
- }
-
- err = send(sk, alt, req->request_len + domlen + 1, 0);
-
- req->numserv++;
- }
-
- return 0;
-}
-
-static int forward_dns_reply(unsigned char *reply, int reply_len, int protocol)
-{
- struct domain_hdr *hdr;
- struct request_data *req;
- int dns_id, sk, err, offset = protocol_offset(protocol);
-
- if (offset < 0)
- return offset;
-
- hdr = (void *)(reply + offset);
- dns_id = reply[offset] | reply[offset + 1] << 8;
-
- DBG("Received %d bytes (id 0x%04x)", reply_len, dns_id);
-
- req = find_request(dns_id);
- if (req == NULL)
- return -EINVAL;
-
- DBG("id 0x%04x rcode %d", hdr->id, hdr->rcode);
-
- reply[offset] = req->srcid & 0xff;
- reply[offset + 1] = req->srcid >> 8;
-
- req->numresp++;
-
- if (hdr->rcode == 0 || req->resp == NULL) {
- g_free(req->resp);
- req->resplen = 0;
-
- req->resp = g_try_malloc(reply_len);
- if (req->resp == NULL)
- return -ENOMEM;
-
- memcpy(req->resp, reply, reply_len);
- req->resplen = reply_len;
- }
-
- if (hdr->rcode > 0 && req->numresp < req->numserv)
- return -EINVAL;
-
- if (req->timeout > 0)
- g_source_remove(req->timeout);
-
- request_list = g_slist_remove(request_list, req);
-
- if (protocol == IPPROTO_UDP) {
- sk = g_io_channel_unix_get_fd(udp_listener_channel);
- err = sendto(sk, req->resp, req->resplen, 0,
- &req->sa, req->sa_len);
- } else {
- sk = req->client_sk;
- err = send(sk, req->resp, req->resplen, 0);
- close(sk);
- }
-
- g_free(req->resp);
- g_free(req);
-
- return err;
-}
-
-static void destroy_server(struct server_data *server)
-{
- GList *list;
-
- DBG("interface %s server %s", server->interface, server->server);
-
- server_list = g_slist_remove(server_list, server);
-
- if (server->watch > 0)
- g_source_remove(server->watch);
-
- if (server->timeout > 0)
- g_source_remove(server->timeout);
-
- g_io_channel_unref(server->channel);
-
- if (server->protocol == IPPROTO_UDP)
- connman_info("Removing DNS server %s", server->server);
-
- g_free(server->incoming_reply);
- g_free(server->server);
- for (list = server->domains; list; list = list->next) {
- char *domain = list->data;
-
- server->domains = g_list_remove(server->domains, domain);
- g_free(domain);
- }
- g_free(server->interface);
- g_free(server);
-}
-
-static gboolean udp_server_event(GIOChannel *channel, GIOCondition condition,
- gpointer user_data)
-{
- unsigned char buf[4096];
- int sk, err, len;
-
- if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
- struct server_data *data = user_data;
-
- connman_error("Error with UDP server %s", data->server);
- data->watch = 0;
- return FALSE;
- }
-
- sk = g_io_channel_unix_get_fd(channel);
-
- len = recv(sk, buf, sizeof(buf), 0);
- if (len < 12)
- return TRUE;
-
- err = forward_dns_reply(buf, len, IPPROTO_UDP);
-
- return TRUE;
-}
-
-static gboolean tcp_server_event(GIOChannel *channel, GIOCondition condition,
- gpointer user_data)
-{
- int sk;
- struct server_data *server = user_data;
-
- sk = g_io_channel_unix_get_fd(channel);
- if (sk == 0)
- return FALSE;
-
- if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
- GSList *list;
- hangup:
- DBG("TCP server channel closed");
-
- /*
- * Discard any partial response which is buffered; better
- * to get a proper response from a working server.
- */
- g_free(server->incoming_reply);
- server->incoming_reply = NULL;
-
- for (list = request_list; list; list = list->next) {
- struct request_data *req = list->data;
- struct domain_hdr *hdr;
-
- if (req->protocol == IPPROTO_UDP)
- continue;
-
- if (req->request == NULL)
- continue;
-
- /*
- * If we're not waiting for any further response
- * from another name server, then we send an error
- * response to the client.
- */
- if (req->numserv && --(req->numserv))
- continue;
-
- hdr = (void *) (req->request + 2);
- hdr->id = req->srcid;
- send_response(req->client_sk, req->request,
- req->request_len, NULL, 0, IPPROTO_TCP);
-
- request_list = g_slist_remove(request_list, req);
- }
-
- destroy_server(server);
-
- return FALSE;
- }
-
- if ((condition & G_IO_OUT) && !server->connected) {
- GSList *list;
- GList *domains;
- struct server_data *udp_server;
-
- udp_server = find_server(server->interface, server->server,
- IPPROTO_UDP);
- if (udp_server != NULL) {
- for (domains = udp_server->domains; domains;
- domains = domains->next) {
- char *dom = domains->data;
-
- DBG("Adding domain %s to %s",
- dom, server->server);
-
- server->domains = g_list_append(server->domains,
- g_strdup(dom));
- }
- }
-
- server->connected = TRUE;
- server_list = g_slist_append(server_list, server);
-
- if (server->timeout > 0) {
- g_source_remove(server->timeout);
- server->timeout = 0;
- }
-
- for (list = request_list; list; list = list->next) {
- struct request_data *req = list->data;
-
- if (req->protocol == IPPROTO_UDP)
- continue;
-
- DBG("Sending req %s over TCP", (char *)req->name);
-
- if (req->timeout > 0)
- g_source_remove(req->timeout);
-
- req->timeout = g_timeout_add_seconds(30,
- request_timeout, req);
- ns_resolv(server, req, req->request, req->name);
- }
-
- } else if (condition & G_IO_IN) {
- struct partial_reply *reply = server->incoming_reply;
- int bytes_recv;
-
- if (!reply) {
- unsigned char reply_len_buf[2];
- uint16_t reply_len;
-
- bytes_recv = recv(sk, reply_len_buf, 2, MSG_PEEK);
- if (!bytes_recv) {
- goto hangup;
- } else if (bytes_recv < 0) {
- if (errno == EAGAIN || errno == EWOULDBLOCK)
- return TRUE;
-
- connman_error("DNS proxy error %s",
- strerror(errno));
- goto hangup;
- } else if (bytes_recv < 2)
- return TRUE;
-
- reply_len = reply_len_buf[1] | reply_len_buf[0] << 8;
- reply_len += 2;
-
- DBG("TCP reply %d bytes", reply_len);
-
- reply = g_try_malloc(sizeof(*reply) + reply_len + 2);
- if (!reply)
- return TRUE;
-
- reply->len = reply_len;
- reply->received = 0;
-
- server->incoming_reply = reply;
- }
-
- while (reply->received < reply->len) {
- bytes_recv = recv(sk, reply->buf + reply->received,
- reply->len - reply->received, 0);
- if (!bytes_recv) {
- connman_error("DNS proxy TCP disconnect");
- break;
- } else if (bytes_recv < 0) {
- if (errno == EAGAIN || errno == EWOULDBLOCK)
- return TRUE;
-
- connman_error("DNS proxy error %s",
- strerror(errno));
- break;
- }
- reply->received += bytes_recv;
- }
-
- forward_dns_reply(reply->buf, reply->received, IPPROTO_TCP);
-
- g_free(reply);
- server->incoming_reply = NULL;
-
- destroy_server(server);
-
- return FALSE;
- }
-
- return TRUE;
-}
-
-static gboolean tcp_idle_timeout(gpointer user_data)
-{
- struct server_data *server = user_data;
-
- DBG("");
-
- if (server == NULL)
- return FALSE;
-
- destroy_server(server);
-
- return FALSE;
-}
-
-static struct server_data *create_server(const char *interface,
- const char *domain, const char *server,
- int protocol)
-{
- struct addrinfo hints, *rp;
- struct server_data *data;
- int sk, ret;
-
- DBG("interface %s server %s", interface, server);
-
- memset(&hints, 0, sizeof(hints));
-
- switch (protocol) {
- case IPPROTO_UDP:
- hints.ai_socktype = SOCK_DGRAM;
- break;
-
- case IPPROTO_TCP:
- hints.ai_socktype = SOCK_STREAM;
- break;
-
- default:
- return NULL;
- }
- hints.ai_family = AF_UNSPEC;
- hints.ai_flags = AI_PASSIVE | AI_NUMERICSERV | AI_NUMERICHOST;
-
- ret = getaddrinfo(server, "53", &hints, &rp);
- if (ret) {
- connman_error("Failed to parse server %s address: %s\n",
- server, gai_strerror(ret));
- return NULL;
- }
- /* Do not blindly copy this code elsewhere; it doesn't loop over the
- results using ->ai_next as it should. That's OK in *this* case
- because it was a numeric lookup; we *know* there's only one. */
-
- sk = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
- if (sk < 0) {
- connman_error("Failed to create server %s socket", server);
- freeaddrinfo(rp);
- return NULL;
- }
-
- if (interface != NULL) {
- if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
- interface, strlen(interface) + 1) < 0) {
- connman_error("Failed to bind server %s "
- "to interface %s",
- server, interface);
- freeaddrinfo(rp);
- close(sk);
- return NULL;
- }
- }
-
- data = g_try_new0(struct server_data, 1);
- if (data == NULL) {
- connman_error("Failed to allocate server %s data", server);
- freeaddrinfo(rp);
- close(sk);
- return NULL;
- }
-
- data->channel = g_io_channel_unix_new(sk);
- if (data->channel == NULL) {
- connman_error("Failed to create server %s channel", server);
- freeaddrinfo(rp);
- close(sk);
- g_free(data);
- return NULL;
- }
-
- g_io_channel_set_close_on_unref(data->channel, TRUE);
-
- if (protocol == IPPROTO_TCP) {
- g_io_channel_set_flags(data->channel, G_IO_FLAG_NONBLOCK, NULL);
- data->watch = g_io_add_watch(data->channel,
- G_IO_OUT | G_IO_IN | G_IO_HUP | G_IO_NVAL | G_IO_ERR,
- tcp_server_event, data);
- data->timeout = g_timeout_add_seconds(30, tcp_idle_timeout,
- data);
- } else
- data->watch = g_io_add_watch(data->channel,
- G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
- udp_server_event, data);
-
- data->interface = g_strdup(interface);
- if (domain)
- data->domains = g_list_append(data->domains, g_strdup(domain));
- data->server = g_strdup(server);
- data->protocol = protocol;
-
- ret = connect(sk, rp->ai_addr, rp->ai_addrlen);
- freeaddrinfo(rp);
- if (ret < 0) {
- if ((protocol == IPPROTO_TCP && errno != EINPROGRESS) ||
- protocol == IPPROTO_UDP) {
- GList *list;
-
- connman_error("Failed to connect to server %s", server);
- if (data->watch > 0)
- g_source_remove(data->watch);
- if (data->timeout > 0)
- g_source_remove(data->timeout);
-
- g_io_channel_unref(data->channel);
- close(sk);
-
- g_free(data->server);
- g_free(data->interface);
- for (list = data->domains; list; list = list->next) {
- char *domain = list->data;
-
- data->domains = g_list_remove(data->domains,
- domain);
- g_free(domain);
- }
- g_free(data);
- return NULL;
- }
- }
-
- if (protocol == IPPROTO_UDP) {
- /* Enable new servers by default */
- data->enabled = TRUE;
- connman_info("Adding DNS server %s", data->server);
-
- server_list = g_slist_append(server_list, data);
-
- return data;
- }
-
- return NULL;
-}
-
-static gboolean resolv(struct request_data *req,
- gpointer request, gpointer name)
-{
- GSList *list;
-
- for (list = server_list; list; list = list->next) {
- struct server_data *data = list->data;
-
- DBG("server %s enabled %d", data->server, data->enabled);
-
- if (data->enabled == FALSE)
- continue;
-
- if (data->watch == 0 && data->protocol == IPPROTO_UDP)
- data->watch = g_io_add_watch(data->channel,
- G_IO_IN | G_IO_NVAL | G_IO_ERR | G_IO_HUP,
- udp_server_event, data);
-
- if (ns_resolv(data, req, request, name) < 0)
- continue;
- }
-
- return TRUE;
-}
-
-static void append_domain(const char *interface, const char *domain)
-{
- GSList *list;
-
- DBG("interface %s domain %s", interface, domain);
-
- for (list = server_list; list; list = list->next) {
- struct server_data *data = list->data;
- GList *dom_list;
- char *dom;
- gboolean dom_found = FALSE;
-
- if (data->interface == NULL)
- continue;
-
- if (g_str_equal(data->interface, interface) == FALSE)
- continue;
-
- for (dom_list = data->domains; dom_list; dom_list = dom_list->next) {
- dom = dom_list->data;
-
- if (g_str_equal(dom, domain)) {
- dom_found = TRUE;
- break;
- }
- }
-
- if (dom_found == FALSE)
- data->domains = g_list_append(data->domains, g_strdup(domain));
- }
-}
-
-static int dnsproxy_append(const char *interface, const char *domain,
- const char *server)
-{
- struct server_data *data;
-
- DBG("interface %s server %s", interface, server);
-
- if (server == NULL && domain == NULL)
- return -EINVAL;
-
- if (server == NULL) {
- append_domain(interface, domain);
-
- return 0;
- }
-
- if (g_str_equal(server, "127.0.0.1") == TRUE)
- return -ENODEV;
-
- data = find_server(interface, server, IPPROTO_UDP);
- if (data != NULL) {
- append_domain(interface, domain);
- return 0;
- }
-
- data = create_server(interface, domain, server, IPPROTO_UDP);
- if (data == NULL)
- return -EIO;
-
- return 0;
-}
-
-static void remove_server(const char *interface, const char *domain,
- const char *server, int protocol)
-{
- struct server_data *data;
-
- data = find_server(interface, server, protocol);
- if (data == NULL)
- return;
-
- destroy_server(data);
-}
-
-static int dnsproxy_remove(const char *interface, const char *domain,
- const char *server)
-{
- DBG("interface %s server %s", interface, server);
-
- if (server == NULL)
- return -EINVAL;
-
- if (g_str_equal(server, "127.0.0.1") == TRUE)
- return -ENODEV;
-
- remove_server(interface, domain, server, IPPROTO_UDP);
- remove_server(interface, domain, server, IPPROTO_TCP);
-
- return 0;
-}
-
-static void dnsproxy_flush(void)
-{
- GSList *list;
-
- list = request_pending_list;
- while (list) {
- struct request_data *req = list->data;
-
- list = list->next;
-
- request_pending_list =
- g_slist_remove(request_pending_list, req);
- resolv(req, req->request, req->name);
- g_free(req->request);
- g_free(req->name);
- }
-}
-
-static struct connman_resolver dnsproxy_resolver = {
- .name = "dnsproxy",
- .priority = CONNMAN_RESOLVER_PRIORITY_HIGH,
- .append = dnsproxy_append,
- .remove = dnsproxy_remove,
- .flush = dnsproxy_flush,
-};
-
-static void dnsproxy_offline_mode(connman_bool_t enabled)
-{
- GSList *list;
-
- DBG("enabled %d", enabled);
-
- for (list = server_list; list; list = list->next) {
- struct server_data *data = list->data;
-
- if (enabled == FALSE) {
- connman_info("Enabling DNS server %s", data->server);
- data->enabled = TRUE;
- } else {
- connman_info("Disabling DNS server %s", data->server);
- data->enabled = FALSE;
- }
- }
-}
-
-static void dnsproxy_default_changed(struct connman_service *service)
-{
- GSList *list;
- char *interface;
-
- DBG("service %p", service);
-
- if (service == NULL) {
- /* When no services are active, then disable DNS proxying */
- dnsproxy_offline_mode(TRUE);
- return;
- }
-
- interface = connman_service_get_interface(service);
- if (interface == NULL)
- return;
-
- for (list = server_list; list; list = list->next) {
- struct server_data *data = list->data;
-
- if (g_strcmp0(data->interface, interface) == 0) {
- connman_info("Enabling DNS server %s", data->server);
- data->enabled = TRUE;
- } else {
- connman_info("Disabling DNS server %s", data->server);
- data->enabled = FALSE;
- }
- }
-
- g_free(interface);
-}
-
-static struct connman_notifier dnsproxy_notifier = {
- .name = "dnsproxy",
- .default_changed = dnsproxy_default_changed,
- .offline_mode = dnsproxy_offline_mode,
-};
-
-static unsigned char opt_edns0_type[2] = { 0x00, 0x29 };
-
-static int parse_request(unsigned char *buf, int len,
- char *name, unsigned int size)
-{
- struct domain_hdr *hdr = (void *) buf;
- uint16_t qdcount = ntohs(hdr->qdcount);
- uint16_t arcount = ntohs(hdr->arcount);
- unsigned char *ptr;
- char *last_label = NULL;
- unsigned int remain, used = 0;
-
- if (len < 12)
- return -EINVAL;
-
- DBG("id 0x%04x qr %d opcode %d qdcount %d arcount %d",
- hdr->id, hdr->qr, hdr->opcode,
- qdcount, arcount);
-
- if (hdr->qr != 0 || qdcount != 1)
- return -EINVAL;
-
- memset(name, 0, size);
-
- ptr = buf + sizeof(struct domain_hdr);
- remain = len - sizeof(struct domain_hdr);
-
- while (remain > 0) {
- uint8_t len = *ptr;
-
- if (len == 0x00) {
- last_label = (char *) (ptr + 1);
- break;
- }
-
- if (used + len + 1 > size)
- return -ENOBUFS;
-
- strncat(name, (char *) (ptr + 1), len);
- strcat(name, ".");
-
- used += len + 1;
-
- ptr += len + 1;
- remain -= len + 1;
- }
-
- if (last_label && arcount && remain >= 9 && last_label[4] == 0 &&
- !memcmp(last_label + 5, opt_edns0_type, 2)) {
- uint16_t edns0_bufsize;
-
- edns0_bufsize = last_label[7] << 8 | last_label[8];
-
- DBG("EDNS0 buffer size %u", edns0_bufsize);
-
- /* This is an evil hack until full TCP support has been
- * implemented.
- *
- * Somtimes the EDNS0 request gets send with a too-small
- * buffer size. Since glibc doesn't seem to crash when it
- * gets a response biffer then it requested, just bump
- * the buffer size up to 4KiB.
- */
- if (edns0_bufsize < 0x1000) {
- last_label[7] = 0x10;
- last_label[8] = 0x00;
- }
- }
-
- DBG("query %s", name);
-
- return 0;
-}
-
-static gboolean tcp_listener_event(GIOChannel *channel, GIOCondition condition,
- gpointer user_data)
-{
- unsigned char buf[768];
- char query[512];
- struct request_data *req;
- struct server_data *server;
- int sk, client_sk, len, err;
- struct sockaddr_in6 client_addr;
- socklen_t client_addr_len = sizeof(client_addr);
- GSList *list;
-
- DBG("condition 0x%x", condition);
-
- if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
- if (tcp_listener_watch > 0)
- g_source_remove(tcp_listener_watch);
- tcp_listener_watch = 0;
-
- connman_error("Error with TCP listener channel");
-
- return FALSE;
- }
-
- sk = g_io_channel_unix_get_fd(channel);
-
- client_sk = accept(sk, (void *)&client_addr, &client_addr_len);
- if (client_sk < 0) {
- connman_error("Accept failure on TCP listener");
- tcp_listener_watch = 0;
- return FALSE;
- }
-
- len = recv(client_sk, buf, sizeof(buf), 0);
- if (len < 2)
- return TRUE;
-
- DBG("Received %d bytes (id 0x%04x)", len, buf[2] | buf[3] << 8);
-
- err = parse_request(buf + 2, len - 2, query, sizeof(query));
- if (err < 0 || (g_slist_length(server_list) == 0 &&
- connman_ondemand_connected())) {
- send_response(client_sk, buf, len, NULL, 0, IPPROTO_TCP);
- return TRUE;
- }
-
- req = g_try_new0(struct request_data, 1);
- if (req == NULL)
- return TRUE;
-
- memcpy(&req->sa, &client_addr, client_addr_len);
- req->sa_len = client_addr_len;
- req->client_sk = client_sk;
- req->protocol = IPPROTO_TCP;
-
- request_id += 2;
- if (request_id == 0x0000 || request_id == 0xffff)
- request_id += 2;
-
- req->srcid = buf[2] | (buf[3] << 8);
- req->dstid = request_id;
- req->altid = request_id + 1;
- req->request_len = len;
-
- buf[2] = req->dstid & 0xff;
- buf[3] = req->dstid >> 8;
-
- req->numserv = 0;
- request_list = g_slist_append(request_list, req);
-
- for (list = server_list; list; list = list->next) {
- struct server_data *data = list->data;
- GList *domains;
-
- if (data->protocol != IPPROTO_UDP || data->enabled == FALSE)
- continue;
-
- server = create_server(data->interface, NULL,
- data->server, IPPROTO_TCP);
-
- /*
- * If server is NULL, we're not connected yet.
- * Copy the relevant buffers and continue with
- * the next nameserver.
- * The request will actually be sent once we're
- * properly connected over TCP to this nameserver.
- */
- if (server == NULL) {
- req->request = g_try_malloc0(req->request_len);
- if (req->request == NULL)
- return TRUE;
-
- memcpy(req->request, buf, req->request_len);
-
- req->name = g_try_malloc0(sizeof(query));
- if (req->name == NULL) {
- g_free(req->request);
- return TRUE;
- }
- memcpy(req->name, query, sizeof(query));
-
- continue;
- }
-
- if (req->timeout > 0)
- g_source_remove(req->timeout);
-
- for (domains = data->domains; domains; domains = domains->next) {
- char *dom = domains->data;
-
- DBG("Adding domain %s to %s", dom, server->server);
-
- server->domains = g_list_append(server->domains,
- g_strdup(dom));
- }
-
- req->timeout = g_timeout_add_seconds(30, request_timeout, req);
- ns_resolv(server, req, buf, query);
- }
-
- return TRUE;
-}
-
-static gboolean udp_listener_event(GIOChannel *channel, GIOCondition condition,
- gpointer user_data)
-{
- unsigned char buf[768];
- char query[512];
- struct request_data *req;
- struct sockaddr_in6 client_addr;
- socklen_t client_addr_len = sizeof(client_addr);
- int sk, err, len;
-
- if (condition & (G_IO_NVAL | G_IO_ERR | G_IO_HUP)) {
- connman_error("Error with UDP listener channel");
- udp_listener_watch = 0;
- return FALSE;
- }
-
- sk = g_io_channel_unix_get_fd(channel);
-
- memset(&client_addr, 0, client_addr_len);
- len = recvfrom(sk, buf, sizeof(buf), 0, (void *)&client_addr,
- &client_addr_len);
- if (len < 2)
- return TRUE;
-
- DBG("Received %d bytes (id 0x%04x)", len, buf[0] | buf[1] << 8);
-
- err = parse_request(buf, len, query, sizeof(query));
- if (err < 0 || (g_slist_length(server_list) == 0 &&
- connman_ondemand_connected())) {
- send_response(sk, buf, len, (void *)&client_addr,
- client_addr_len, IPPROTO_UDP);
- return TRUE;
- }
-
- req = g_try_new0(struct request_data, 1);
- if (req == NULL)
- return TRUE;
-
- memcpy(&req->sa, &client_addr, client_addr_len);
- req->sa_len = client_addr_len;
- req->client_sk = 0;
- req->protocol = IPPROTO_UDP;
-
- request_id += 2;
- if (request_id == 0x0000 || request_id == 0xffff)
- request_id += 2;
-
- req->srcid = buf[0] | (buf[1] << 8);
- req->dstid = request_id;
- req->altid = request_id + 1;
- req->request_len = len;
-
- buf[0] = req->dstid & 0xff;
- buf[1] = req->dstid >> 8;
-
- if (!connman_ondemand_connected()) {
- DBG("Starting on demand connection");
- /*
- * We're not connected, let's queue the request and start
- * an on-demand connection.
- */
- req->request = g_try_malloc0(req->request_len);
- if (req->request == NULL)
- return TRUE;
-
- memcpy(req->request, buf, req->request_len);
-
- req->name = g_try_malloc0(sizeof(query));
- if (req->name == NULL) {
- g_free(req->request);
- return TRUE;
- }
- memcpy(req->name, query, sizeof(query));
-
- request_pending_list = g_slist_append(request_pending_list,
- req);
-
- connman_ondemand_start("", 300);
-
- return TRUE;
- }
-
-
- req->numserv = 0;
- req->timeout = g_timeout_add_seconds(5, request_timeout, req);
- request_list = g_slist_append(request_list, req);
-
- return resolv(req, buf, query);
-}
-
-static int create_dns_listener(int protocol)
-{
- GIOChannel *channel;
- const char *ifname = "lo", *proto;
- union {
- struct sockaddr sa;
- struct sockaddr_in6 sin6;
- struct sockaddr_in sin;
- } s;
- socklen_t slen;
- int sk, type, v6only = 0;
- int family = AF_INET6;
-
- DBG("");
-
- switch (protocol) {
- case IPPROTO_UDP:
- proto = "UDP";
- type = SOCK_DGRAM;
- break;
-
- case IPPROTO_TCP:
- proto = "TCP";
- type = SOCK_STREAM;
- break;
-
- default:
- return -EINVAL;
- }
-
- sk = socket(family, type, protocol);
- if (sk < 0 && family == AF_INET6 && errno == EAFNOSUPPORT) {
- connman_error("No IPv6 support; DNS proxy listening only on Legacy IP");
- family = AF_INET;
- sk = socket(family, type, protocol);
- }
- if (sk < 0) {
- connman_error("Failed to create %s listener socket", proto);
- return -EIO;
- }
-
- if (setsockopt(sk, SOL_SOCKET, SO_BINDTODEVICE,
- ifname, strlen(ifname) + 1) < 0) {
- connman_error("Failed to bind %s listener interface", proto);
- close(sk);
- return -EIO;
- }
- /* Ensure it accepts Legacy IP connections too */
- if (family == AF_INET6 &&
- setsockopt(sk, SOL_IPV6, IPV6_V6ONLY, &v6only, sizeof(v6only)) < 0) {
- connman_error("Failed to clear V6ONLY on %s listener socket",
- proto);
- close(sk);
- return -EIO;
- }
-
- if (family == AF_INET) {
- memset(&s.sin, 0, sizeof(s.sin));
- s.sin.sin_family = AF_INET;
- s.sin.sin_port = htons(53);
- s.sin.sin_addr.s_addr = htonl(INADDR_ANY);
- slen = sizeof(s.sin);
- } else {
- memset(&s.sin6, 0, sizeof(s.sin6));
- s.sin6.sin6_family = AF_INET6;
- s.sin6.sin6_port = htons(53);
- s.sin6.sin6_addr = in6addr_any;
- slen = sizeof(s.sin6);
- }
-
- if (bind(sk, &s.sa, slen) < 0) {
- connman_error("Failed to bind %s listener socket", proto);
- close(sk);
- return -EIO;
- }
-
- if (protocol == IPPROTO_TCP && listen(sk, 10) < 0) {
- connman_error("Failed to listen on TCP socket");
- close(sk);
- return -EIO;
- }
-
- channel = g_io_channel_unix_new(sk);
- if (channel == NULL) {
- connman_error("Failed to create %s listener channel", proto);
- close(sk);
- return -EIO;
- }
-
- g_io_channel_set_close_on_unref(channel, TRUE);
-
- if (protocol == IPPROTO_TCP) {
- tcp_listener_channel = channel;
- tcp_listener_watch = g_io_add_watch(channel,
- G_IO_IN, tcp_listener_event, NULL);
- } else {
- udp_listener_channel = channel;
- udp_listener_watch = g_io_add_watch(channel,
- G_IO_IN, udp_listener_event, NULL);
- }
-
- return 0;
-}
-
-static void destroy_udp_listener(void)
-{
- DBG("");
-
- if (udp_listener_watch > 0)
- g_source_remove(udp_listener_watch);
-
- g_io_channel_unref(udp_listener_channel);
-}
-
-static void destroy_tcp_listener(void)
-{
- DBG("");
-
- if (tcp_listener_watch > 0)
- g_source_remove(tcp_listener_watch);
-
- g_io_channel_unref(tcp_listener_channel);
-}
-
-static int create_listener(void)
-{
- int err;
-
- err = create_dns_listener(IPPROTO_UDP);
- if (err < 0)
- return err;
-
- err = create_dns_listener(IPPROTO_TCP);
- if (err < 0) {
- destroy_udp_listener();
- return err;
- }
-
- connman_resolver_append("lo", NULL, "127.0.0.1");
-
- return 0;
-}
-
-static void destroy_listener(void)
-{
- GSList *list;
-
- connman_resolver_remove_all("lo");
-
- for (list = request_pending_list; list; list = list->next) {
- struct request_data *req = list->data;
-
- DBG("Dropping pending request (id 0x%04x -> 0x%04x)",
- req->srcid, req->dstid);
-
- g_free(req->resp);
- g_free(req->request);
- g_free(req->name);
- g_free(req);
- list->data = NULL;
- }
-
- g_slist_free(request_pending_list);
- request_pending_list = NULL;
-
- for (list = request_list; list; list = list->next) {
- struct request_data *req = list->data;
-
- DBG("Dropping request (id 0x%04x -> 0x%04x)",
- req->srcid, req->dstid);
-
- g_free(req->resp);
- g_free(req->request);
- g_free(req->name);
- g_free(req);
- list->data = NULL;
- }
-
- g_slist_free(request_list);
- request_list = NULL;
-
- destroy_tcp_listener();
- destroy_udp_listener();
-}
-
-static int dnsproxy_init(void)
-{
- int err;
-
- err = create_listener();
- if (err < 0)
- return err;
-
- err = connman_resolver_register(&dnsproxy_resolver);
- if (err < 0)
- goto destroy;
-
- err = connman_notifier_register(&dnsproxy_notifier);
- if (err < 0)
- goto unregister;
-
- return 0;
-
-unregister:
- connman_resolver_unregister(&dnsproxy_resolver);
-
-destroy:
- destroy_listener();
-
- return err;
-}
-
-static void dnsproxy_exit(void)
-{
- connman_notifier_unregister(&dnsproxy_notifier);
-
- connman_resolver_unregister(&dnsproxy_resolver);
-
- destroy_listener();
-}
-
-CONNMAN_PLUGIN_DEFINE(dnsproxy, "DNS proxy resolver plugin", VERSION,
- CONNMAN_PLUGIN_PRIORITY_DEFAULT, dnsproxy_init, dnsproxy_exit)