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New bind-to option to allow DNS clients to bind to arbitrary ports for their outgoing addresses.

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svn:r1119
This commit is contained in:
Nick Mathewson 2009-02-11 17:24:11 +00:00
parent acaf65c359
commit 77c80b8dcf
3 changed files with 30 additions and 1 deletions
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1
ChangeLog
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@ -142,6 +142,7 @@ Changes in current version:
o Change the semantics of timeouts in conjunction with EV_PERSIST; timeouts in that case will now repeat until deleted.
o sendfile, mmap and memory reference support for evbuffers.
o New evutil_make_listen_socket_reuseable() to abstract SO_REUSEADDR.
o New bind-to option to allow DNS clients to bind to an arbitrary port for outgoing requests.
Changes in 1.4.0:
o allow \r or \n individually to separate HTTP headers instead of the standard "\r\n"; from Charles Kerr.

25
evdns.c
View File

@ -318,6 +318,11 @@ struct evdns_base {
/* true iff we will use the 0x20 hack to prevent poisoning attacks. */
int global_randomize_case;
/** Port to bind to for outgoing DNS packets. */
struct sockaddr_storage global_outgoing_address;
/** Socklen_t for global_outgoing_address. 0 if it isn't set. */
socklen_t global_outgoing_addrlen;
struct search_state *global_search_state;
};
@ -2231,6 +2236,17 @@ _evdns_nameserver_add_impl(struct evdns_base *base, const struct sockaddr *addre
ns->socket = socket(PF_INET, SOCK_DGRAM, 0);
if (ns->socket < 0) { err = 1; goto out1; }
evutil_make_socket_nonblocking(ns->socket);
if (base->global_outgoing_addrlen) {
if (bind(ns->socket,
(struct sockaddr*)&base->global_outgoing_address,
base->global_outgoing_addrlen) < 0) {
log(EVDNS_LOG_WARN,"Couldn't bind to outgoing address");
err = 2;
goto out2;
}
}
if (connect(ns->socket, address, addrlen) != 0) {
err = 2;
goto out2;
@ -2955,6 +2971,15 @@ evdns_base_set_option(struct evdns_base *base,
int randcase = strtoint(val);
if (!(flags & DNS_OPTION_MISC)) return 0;
base->global_randomize_case = randcase;
} else if (!strncmp(option, "bind-to:", 8)) {
/* XXX This only applies to successive nameservers, not
* to already-configured ones. We might want to fix that. */
int len = sizeof(base->global_outgoing_address);
if (!(flags & DNS_OPTION_NAMESERVERS)) return 0;
if (evutil_parse_sockaddr_port(val,
(struct sockaddr*)&base->global_outgoing_address, &len))
return -1;
base->global_outgoing_addrlen = len;
}
return 0;
}

5
include/event2/dns.h
View File

@ -395,7 +395,10 @@ void evdns_cancel_request(struct evdns_base *base, struct evdns_request *req);
The currently available configuration options are:
ndots, timeout, max-timeouts, max-inflight, attempts, randomize-case.
ndots, timeout, max-timeouts, max-inflight, attempts, randomize-case,
bind-to.
The option name needs to end with a colon.
@param base the evdns_base to which to apply this operation
@param option the name of the configuration option to be modified