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Support a few more socket options, and refactor the option setting a bit. (Patch from the Google tree.)

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This commit is contained in:
Steinar H. Gunderson 2007-09-28 15:15:39 +00:00
parent 6ce589c3ee
commit 08a70d117c
3 changed files with 64 additions and 3 deletions
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4
ares/ares.h
View File

@ -98,6 +98,8 @@ extern "C" {
#define ARES_OPT_LOOKUPS (1 << 8)
#define ARES_OPT_SOCK_STATE_CB (1 << 9)
#define ARES_OPT_SORTLIST (1 << 10)
#define ARES_OPT_SOCK_SNDBUF (1 << 11)
#define ARES_OPT_SOCK_RCVBUF (1 << 12)
/* Nameinfo flag values */
#define ARES_NI_NOFQDN (1 << 0)
@ -177,6 +179,8 @@ struct ares_options {
int ndots;
unsigned short udp_port;
unsigned short tcp_port;
int socket_send_buffer_size;
int socket_receive_buffer_size;
struct in_addr *servers;
int nservers;
char **domains;

8
ares/ares_init.c
View File

@ -133,6 +133,8 @@ int ares_init_options(ares_channel *channelptr, struct ares_options *options,
channel->ndots = -1;
channel->udp_port = -1;
channel->tcp_port = -1;
channel->socket_send_buffer_size = -1;
channel->socket_receive_buffer_size = -1;
channel->nservers = -1;
channel->ndomains = -1;
channel->nsort = -1;
@ -320,6 +322,12 @@ static int init_by_options(ares_channel channel,
channel->sock_state_cb = options->sock_state_cb;
channel->sock_state_cb_data = options->sock_state_cb_data;
}
if ((optmask & ARES_OPT_SOCK_SNDBUF)
&& channel->socket_send_buffer_size == -1)
channel->socket_send_buffer_size = options->socket_send_buffer_size;
if ((optmask & ARES_OPT_SOCK_RCVBUF)
&& channel->socket_receive_buffer_size == -1)
channel->socket_receive_buffer_size = options->socket_receive_buffer_size;
/* Copy the servers, if given. */
if ((optmask & ARES_OPT_SERVERS) && channel->nservers == -1)

55
ares/ares_process.c
View File

@ -25,6 +25,7 @@
#ifdef HAVE_SYS_UIO_H
#include <sys/uio.h>
#endif
#include <netinet/tcp.h> /* for TCP_NODELAY */
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/nameser.h>
@ -732,9 +733,36 @@ static int nonblock(ares_socket_t sockfd, /* operate on this */
#endif
}
static int configure_socket(int s, ares_channel channel)
{
nonblock(s, TRUE);
#ifdef FD_CLOEXEC
/* Configure the socket fd as close-on-exec. */
if (fcntl(s, F_SETFD, FD_CLOEXEC) == -1)
return -1;
#endif
/* Set the socket's send and receive buffer sizes. */
if ((channel->socket_send_buffer_size > 0) &&
setsockopt(s, SOL_SOCKET, SO_SNDBUF,
&channel->socket_send_buffer_size,
sizeof(channel->socket_send_buffer_size)) == -1)
return -1;
if ((channel->socket_receive_buffer_size > 0) &&
setsockopt(s, SOL_SOCKET, SO_RCVBUF,
&channel->socket_receive_buffer_size,
sizeof(channel->socket_receive_buffer_size)) == -1)
return -1;
return 0;
}
static int open_tcp_socket(ares_channel channel, struct server_state *server)
{
ares_socket_t s;
int opt;
struct sockaddr_in sockin;
/* Acquire a socket. */
@ -742,8 +770,25 @@ static int open_tcp_socket(ares_channel channel, struct server_state *server)
if (s == ARES_SOCKET_BAD)
return -1;
/* Set the socket non-blocking. */
nonblock(s, TRUE);
/* Configure it. */
if (configure_socket(s, channel) < 0)
{
close(s);
return -1;
}
/*
* Disable the Nagle algorithm (only relevant for TCP sockets, and thus not in
* configure_socket). In general, in DNS lookups we're pretty much interested
* in firing off a single request and then waiting for a reply, so batching
* isn't very interesting in general.
*/
opt = 1;
if (setsockopt(s, IPPROTO_TCP, TCP_NODELAY, &opt, sizeof(opt)) == -1)
{
close(s);
return -1;
}
/* Connect to the server. */
memset(&sockin, 0, sizeof(sockin));
@ -777,7 +822,11 @@ static int open_udp_socket(ares_channel channel, struct server_state *server)
return -1;
/* Set the socket non-blocking. */
nonblock(s, TRUE);
if (configure_socket(s, channel) < 0)
{
close(s);
return -1;
}
/* Connect to the server. */
memset(&sockin, 0, sizeof(sockin));