diff options
Diffstat (limited to 'src/or/dnsserv.c')
| -rw-r--r-- | src/or/dnsserv.c | 33 |
1 files changed, 23 insertions, 10 deletions
diff --git a/src/or/dnsserv.c b/src/or/dnsserv.c index f5a4f2ac0f..7e344deeab 100644 --- a/src/or/dnsserv.c +++ b/src/or/dnsserv.c @@ -1,12 +1,24 @@ -/* Copyright (c) 2007-2016, The Tor Project, Inc. */ +/* Copyright (c) 2007-2017, The Tor Project, Inc. */ /* See LICENSE for licensing information */ /** * \file dnsserv.c - * \brief Implements client-side DNS proxy server code. Note: - * this is the DNS Server code, not the Server DNS code. Confused? This code - * runs on client-side, and acts as a DNS server. The code in dns.c, on the - * other hand, runs on Tor servers, and acts as a DNS client. + * \brief Implements client-side DNS proxy server code. + * + * When a user enables the DNSPort configuration option to have their local + * Tor client handle DNS requests, this module handles it. It functions as a + * "DNS Server" on the client side, which client applications use. + * + * Inbound DNS requests are represented as entry_connection_t here (since + * that's how Tor represents client-side streams), which are kept associated + * with an evdns_server_request structure as exposed by Libevent's + * evdns code. + * + * Upon receiving a DNS request, libevent calls our evdns_server_callback() + * function here, which causes this module to create an entry_connection_t + * request as appropriate. Later, when that request is answered, + * connection_edge.c calls dnsserv_resolved() so we can finish up and tell the + * DNS client. **/ #include "or.h" @@ -160,7 +172,7 @@ evdns_server_callback(struct evdns_server_request *req, void *data_) if (connection_add(ENTRY_TO_CONN(entry_conn)) < 0) { log_warn(LD_APP, "Couldn't register dummy connection for DNS request"); evdns_server_request_respond(req, DNS_ERR_SERVERFAILED); - connection_free(ENTRY_TO_CONN(entry_conn)); + connection_free_(ENTRY_TO_CONN(entry_conn)); return; } @@ -196,6 +208,7 @@ dnsserv_launch_request(const char *name, int reverse, /* Make a new dummy AP connection, and attach the request to it. */ entry_conn = entry_connection_new(CONN_TYPE_AP, AF_INET); + entry_conn->entry_cfg.dns_request = 1; conn = ENTRY_TO_EDGE_CONN(entry_conn); CONNECTION_AP_EXPECT_NONPENDING(entry_conn); conn->base_.state = AP_CONN_STATE_RESOLVE_WAIT; @@ -214,10 +227,10 @@ dnsserv_launch_request(const char *name, int reverse, TO_CONN(conn)->port = control_conn->base_.port; TO_CONN(conn)->address = tor_addr_to_str_dup(&control_conn->base_.addr); } -#else +#else /* !(defined(AF_UNIX)) */ TO_CONN(conn)->port = control_conn->base_.port; TO_CONN(conn)->address = tor_addr_to_str_dup(&control_conn->base_.addr); -#endif +#endif /* defined(AF_UNIX) */ if (reverse) entry_conn->socks_request->command = SOCKS_COMMAND_RESOLVE_PTR; @@ -237,7 +250,7 @@ dnsserv_launch_request(const char *name, int reverse, if (connection_add(TO_CONN(conn))<0) { log_warn(LD_APP, "Couldn't register dummy connection for RESOLVE request"); - connection_free(TO_CONN(conn)); + connection_free_(TO_CONN(conn)); return -1; } @@ -272,7 +285,7 @@ dnsserv_reject_request(entry_connection_t *conn) } /** Look up the original name that corresponds to 'addr' in req. We use this - * to preserve case in order to facilitate people using 0x20-hacks to avoid + * to preserve case in order to facilitate clients using 0x20-hacks to avoid * DNS poisoning. */ static const char * evdns_get_orig_address(const struct evdns_server_request *req, |