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Refactor inet_connect_opts function

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refactor address resolution code to fix nonblocking connect
remove getnameinfo call

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Amos Kong <akong@redhat.com>
Signed-off-by: Orit Wasserman <owasserm@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Michael S. Tsirkin 2012-09-24 13:11:07 +02:00 committed by Anthony Liguori
parent 8bdd3d499f
commit 05bc1d8a4b
1 changed files with 92 additions and 70 deletions
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162
qemu-sockets.c
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@ -209,95 +209,117 @@ listen:
return slisten;
}
int inet_connect_opts(QemuOpts *opts, bool *in_progress, Error **errp)
{
struct addrinfo ai,*res,*e;
const char *addr;
const char *port;
char uaddr[INET6_ADDRSTRLEN+1];
char uport[33];
int sock,rc;
bool block;
#ifdef _WIN32
#define QEMU_SOCKET_RC_INPROGRESS(rc) \
((rc) == -EINPROGRESS || (rc) == -EWOULDBLOCK || (rc) == -WSAEALREADY)
#else
#define QEMU_SOCKET_RC_INPROGRESS(rc) \
((rc) == -EINPROGRESS)
#endif
memset(&ai,0, sizeof(ai));
ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
ai.ai_family = PF_UNSPEC;
ai.ai_socktype = SOCK_STREAM;
static int inet_connect_addr(struct addrinfo *addr, bool block,
bool *in_progress)
{
int sock, rc;
if (in_progress) {
*in_progress = false;
}
sock = qemu_socket(addr->ai_family, addr->ai_socktype, addr->ai_protocol);
if (sock < 0) {
fprintf(stderr, "%s: socket(%s): %s\n", __func__,
inet_strfamily(addr->ai_family), strerror(errno));
return -1;
}
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
if (!block) {
socket_set_nonblock(sock);
}
/* connect to peer */
do {
rc = 0;
if (connect(sock, addr->ai_addr, addr->ai_addrlen) < 0) {
rc = -socket_error();
}
} while (rc == -EINTR);
if (!block && QEMU_SOCKET_RC_INPROGRESS(rc)) {
if (in_progress) {
*in_progress = true;
}
} else if (rc < 0) {
closesocket(sock);
return -1;
}
return sock;
}
static struct addrinfo *inet_parse_connect_opts(QemuOpts *opts, Error **errp)
{
struct addrinfo ai, *res;
int rc;
const char *addr;
const char *port;
memset(&ai, 0, sizeof(ai));
ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
ai.ai_family = PF_UNSPEC;
ai.ai_socktype = SOCK_STREAM;
addr = qemu_opt_get(opts, "host");
port = qemu_opt_get(opts, "port");
block = qemu_opt_get_bool(opts, "block", 0);
if (addr == NULL || port == NULL) {
fprintf(stderr, "inet_connect: host and/or port not specified\n");
fprintf(stderr,
"inet_parse_connect_opts: host and/or port not specified\n");
error_set(errp, QERR_SOCKET_CREATE_FAILED);
return NULL;
}
if (qemu_opt_get_bool(opts, "ipv4", 0)) {
ai.ai_family = PF_INET;
}
if (qemu_opt_get_bool(opts, "ipv6", 0)) {
ai.ai_family = PF_INET6;
}
/* lookup */
rc = getaddrinfo(addr, port, &ai, &res);
if (rc != 0) {
fprintf(stderr, "getaddrinfo(%s,%s): %s\n", addr, port,
gai_strerror(rc));
error_set(errp, QERR_SOCKET_CREATE_FAILED);
return NULL;
}
return res;
}
int inet_connect_opts(QemuOpts *opts, bool *in_progress, Error **errp)
{
struct addrinfo *res, *e;
int sock = -1;
bool block = qemu_opt_get_bool(opts, "block", 0);
res = inet_parse_connect_opts(opts, errp);
if (!res) {
return -1;
}
if (qemu_opt_get_bool(opts, "ipv4", 0))
ai.ai_family = PF_INET;
if (qemu_opt_get_bool(opts, "ipv6", 0))
ai.ai_family = PF_INET6;
/* lookup */
if (0 != (rc = getaddrinfo(addr, port, &ai, &res))) {
fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port,
gai_strerror(rc));
error_set(errp, QERR_SOCKET_CREATE_FAILED);
return -1;
if (in_progress) {
*in_progress = false;
}
for (e = res; e != NULL; e = e->ai_next) {
if (getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
uaddr,INET6_ADDRSTRLEN,uport,32,
NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
fprintf(stderr,"%s: getnameinfo: oops\n", __FUNCTION__);
continue;
sock = inet_connect_addr(e, block, in_progress);
if (sock >= 0) {
break;
}
sock = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol);
if (sock < 0) {
fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
inet_strfamily(e->ai_family), strerror(errno));
continue;
}
setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
if (!block) {
socket_set_nonblock(sock);
}
/* connect to peer */
do {
rc = 0;
if (connect(sock, e->ai_addr, e->ai_addrlen) < 0) {
rc = -socket_error();
}
} while (rc == -EINTR);
#ifdef _WIN32
if (!block && (rc == -EINPROGRESS || rc == -EWOULDBLOCK
|| rc == -WSAEALREADY)) {
#else
if (!block && (rc == -EINPROGRESS)) {
#endif
if (in_progress) {
*in_progress = true;
}
} else if (rc < 0) {
if (NULL == e->ai_next)
fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", __FUNCTION__,
inet_strfamily(e->ai_family),
e->ai_canonname, uaddr, uport, strerror(errno));
closesocket(sock);
continue;
}
freeaddrinfo(res);
return sock;
}
error_set(errp, QERR_SOCKET_CONNECT_FAILED);
if (sock < 0) {
error_set(errp, QERR_SOCKET_CONNECT_FAILED);
}
freeaddrinfo(res);
return -1;
return sock;
}
int inet_dgram_opts(QemuOpts *opts)