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d247d25f18
qemu-e2k/qemu-sockets.c
aliguori d247d25f18 sockets: helper functions for qemu (Gerd Hoffman) 
This patch creates a new source file qemu-sockets.c with a bunch of
helper functions to create listening and connected sockets.

New features of this code are (a) support for searching for a free
port in a given range and (b) support for IPv6.

The following patches put that code into use.

Compile fixes for Windows added by Anthony Liguori

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5695 c046a42c-6fe2-441c-8c8c-71466251a162
2008-11-11 20:46:40 +00:00

401 lines
11 KiB
C
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include "qemu_socket.h"
#ifndef AI_ADDRCONFIG
# define AI_ADDRCONFIG 0
#endif
static int sockets_debug = 0;
static const int on=1, off=0;
static int inet_getport(struct addrinfo *e)
{
struct sockaddr_in *i4;
struct sockaddr_in6 *i6;
switch (e->ai_family) {
case PF_INET6:
i6 = (void*)e->ai_addr;
return ntohs(i6->sin6_port);
case PF_INET:
i4 = (void*)e->ai_addr;
return ntohs(i4->sin_port);
default:
return 0;
}
}
static void inet_setport(struct addrinfo *e, int port)
{
struct sockaddr_in *i4;
struct sockaddr_in6 *i6;
switch (e->ai_family) {
case PF_INET6:
i6 = (void*)e->ai_addr;
i6->sin6_port = htons(port);
break;
case PF_INET:
i4 = (void*)e->ai_addr;
i4->sin_port = htons(port);
break;
}
}
static const char *inet_strfamily(int family)
{
switch (family) {
case PF_INET6: return "ipv6";
case PF_INET: return "ipv4";
case PF_UNIX: return "unix";
}
return "????";
}
static void inet_print_addrinfo(const char *tag, struct addrinfo *res)
{
struct addrinfo *e;
char uaddr[INET6_ADDRSTRLEN+1];
char uport[33];
for (e = res; e != NULL; e = e->ai_next) {
getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
uaddr,INET6_ADDRSTRLEN,uport,32,
NI_NUMERICHOST | NI_NUMERICSERV);
fprintf(stderr,"%s: getaddrinfo: family %s, host %s, port %s\n",
tag, inet_strfamily(e->ai_family), uaddr, uport);
}
}
int inet_listen(const char *str, char *ostr, int olen,
int socktype, int port_offset)
{
struct addrinfo ai,*res,*e;
char addr[64];
char port[33];
char uaddr[INET6_ADDRSTRLEN+1];
char uport[33];
const char *opts, *h;
int slisten,rc,pos,to,try_next;
memset(&ai,0, sizeof(ai));
ai.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
ai.ai_family = PF_UNSPEC;
ai.ai_socktype = socktype;
/* parse address */
if (str[0] == ':') {
/* no host given */
strcpy(addr,"");
if (1 != sscanf(str,":%32[^,]%n",port,&pos)) {
fprintf(stderr, "%s: portonly parse error (%s)\n",
__FUNCTION__, str);
return -1;
}
} else if (str[0] == '[') {
/* IPv6 addr */
if (2 != sscanf(str,"[%64[^]]]:%32[^,]%n",addr,port,&pos)) {
fprintf(stderr, "%s: ipv6 parse error (%s)\n",
__FUNCTION__, str);
return -1;
}
ai.ai_family = PF_INET6;
} else if (isdigit(str[0])) {
/* IPv4 addr */
if (2 != sscanf(str,"%64[0-9.]:%32[^,]%n",addr,port,&pos)) {
fprintf(stderr, "%s: ipv4 parse error (%s)\n",
__FUNCTION__, str);
return -1;
}
ai.ai_family = PF_INET;
} else {
/* hostname */
if (2 != sscanf(str,"%64[^:]:%32[^,]%n",addr,port,&pos)) {
fprintf(stderr, "%s: hostname parse error (%s)\n",
__FUNCTION__, str);
return -1;
}
}
/* parse options */
opts = str + pos;
h = strstr(opts, ",to=");
to = h ? atoi(h+4) : 0;
if (strstr(opts, ",ipv4"))
ai.ai_family = PF_INET;
if (strstr(opts, ",ipv6"))
ai.ai_family = PF_INET6;
/* lookup */
if (port_offset)
snprintf(port, sizeof(port), "%d", atoi(port) + port_offset);
rc = getaddrinfo(strlen(addr) ? addr : NULL, port, &ai, &res);
if (rc != 0) {
fprintf(stderr,"%s: getaddrinfo(%s,%s): %s\n", __FUNCTION__,
addr, port, gai_strerror(rc));
return -1;
}
if (sockets_debug)
inet_print_addrinfo(__FUNCTION__, res);
/* create socket + bind */
for (e = res; e != NULL; e = e->ai_next) {
getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
uaddr,INET6_ADDRSTRLEN,uport,32,
NI_NUMERICHOST | NI_NUMERICSERV);
slisten = socket(e->ai_family, e->ai_socktype, e->ai_protocol);
if (slisten < 0) {
fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
inet_strfamily(e->ai_family), strerror(errno));
continue;
}
setsockopt(slisten,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
#ifdef IPV6_V6ONLY
if (e->ai_family == PF_INET6) {
/* listen on both ipv4 and ipv6 */
setsockopt(slisten,IPPROTO_IPV6,IPV6_V6ONLY,(void*)&off,sizeof(off));
}
#endif
for (;;) {
if (bind(slisten, e->ai_addr, e->ai_addrlen) == 0) {
if (sockets_debug)
fprintf(stderr,"%s: bind(%s,%s,%d): OK\n", __FUNCTION__,
inet_strfamily(e->ai_family), uaddr, inet_getport(e));
goto listen;
}
try_next = to && (inet_getport(e) <= to + port_offset);
if (!try_next || sockets_debug)
fprintf(stderr,"%s: bind(%s,%s,%d): %s\n", __FUNCTION__,
inet_strfamily(e->ai_family), uaddr, inet_getport(e),
strerror(errno));
if (try_next) {
inet_setport(e, inet_getport(e) + 1);
continue;
}
break;
}
closesocket(slisten);
}
fprintf(stderr, "%s: FAILED\n", __FUNCTION__);
freeaddrinfo(res);
return -1;
listen:
if (listen(slisten,1) != 0) {
perror("listen");
closesocket(slisten);
return -1;
}
if (ostr) {
if (e->ai_family == PF_INET6) {
snprintf(ostr, olen, "[%s]:%d%s", uaddr,
inet_getport(e) - port_offset, opts);
} else {
snprintf(ostr, olen, "%s:%d%s", uaddr,
inet_getport(e) - port_offset, opts);
}
}
freeaddrinfo(res);
return slisten;
}
int inet_connect(const char *str, int socktype)
{
struct addrinfo ai,*res,*e;
char addr[64];
char port[33];
char uaddr[INET6_ADDRSTRLEN+1];
char uport[33];
int sock,rc;
memset(&ai,0, sizeof(ai));
ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
ai.ai_family = PF_UNSPEC;
ai.ai_socktype = socktype;
/* parse address */
if (str[0] == '[') {
/* IPv6 addr */
if (2 != sscanf(str,"[%64[^]]]:%32[^,]",addr,port)) {
fprintf(stderr, "%s: ipv6 parse error (%s)\n",
__FUNCTION__, str);
return -1;
}
ai.ai_family = PF_INET6;
} else if (isdigit(str[0])) {
/* IPv4 addr */
if (2 != sscanf(str,"%64[0-9.]:%32[^,]",addr,port)) {
fprintf(stderr, "%s: ipv4 parse error (%s)\n",
__FUNCTION__, str);
return -1;
}
ai.ai_family = PF_INET;
} else {
/* hostname */
if (2 != sscanf(str,"%64[^:]:%32[^,]",addr,port)) {
fprintf(stderr, "%s: hostname parse error (%s)\n",
__FUNCTION__, str);
return -1;
}
}
/* parse options */
if (strstr(str, ",ipv4"))
ai.ai_family = PF_INET;
if (strstr(str, ",ipv6"))
ai.ai_family = PF_INET6;
/* lookup */
if (0 != (rc = getaddrinfo(addr, port, &ai, &res))) {
fprintf(stderr,"getaddrinfo(%s,%s): %s\n", gai_strerror(rc),
addr, port);
return -1;
}
if (sockets_debug)
inet_print_addrinfo(__FUNCTION__, res);
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 = 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));
/* connect to peer */
if (connect(sock,e->ai_addr,e->ai_addrlen) < 0) {
if (sockets_debug || 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;
}
if (sockets_debug)
fprintf(stderr, "%s: connect(%s,%s,%s,%s): OK\n", __FUNCTION__,
inet_strfamily(e->ai_family),
e->ai_canonname, uaddr, uport);
freeaddrinfo(res);
return sock;
}
freeaddrinfo(res);
return -1;
}
#ifndef _WIN32
int unix_listen(const char *str, char *ostr, int olen)
{
struct sockaddr_un un;
char *path, *opts;
int sock, fd, len;
sock = socket(PF_UNIX, SOCK_STREAM, 0);
if (sock < 0) {
perror("socket(unix)");
return -1;
}
opts = strchr(str, ',');
if (opts) {
len = opts - str;
path = malloc(len+1);
snprintf(path, len+1, "%.*s", len, str);
} else
path = strdup(str);
memset(&un, 0, sizeof(un));
un.sun_family = AF_UNIX;
if (path && strlen(path)) {
snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
} else {
char *tmpdir = getenv("TMPDIR");
snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX",
tmpdir ? tmpdir : "/tmp");
/*
* This dummy fd usage silences the mktemp() unsecure warning.
* Using mkstemp() doesn't make things more secure here
* though. bind() complains about existing files, so we have
* to unlink first and thus re-open the race window. The
* worst case possible is bind() failing, i.e. a DoS attack.
*/
fd = mkstemp(un.sun_path); close(fd);
}
snprintf(ostr, olen, "%s%s", un.sun_path, opts ? opts : "");
unlink(un.sun_path);
if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
fprintf(stderr, "bind(unix:%s): %s\n", un.sun_path, strerror(errno));
goto err;
}
if (listen(sock, 1) < 0) {
fprintf(stderr, "listen(unix:%s): %s\n", un.sun_path, strerror(errno));
goto err;
}
if (sockets_debug)
fprintf(stderr, "bind(unix:%s): OK\n", un.sun_path);
free(path);
return sock;
err:
free(path);
closesocket(sock);
return -1;
}
int unix_connect(const char *path)
{
struct sockaddr_un un;
int sock;
sock = socket(PF_UNIX, SOCK_STREAM, 0);
if (sock < 0) {
perror("socket(unix)");
return -1;
}
memset(&un, 0, sizeof(un));
un.sun_family = AF_UNIX;
snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
if (connect(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
fprintf(stderr, "connect(unix:%s): %s\n", path, strerror(errno));
return -1;
}
if (sockets_debug)
fprintf(stderr, "connect(unix:%s): OK\n", path);
return sock;
}
#else
int unix_listen(const char *path, char *ostr, int olen)
{
fprintf(stderr, "unix sockets are not available on windows\n");
return -1;
}
int unix_connect(const char *path)
{
fprintf(stderr, "unix sockets are not available on windows\n");
return -1;
}
#endif
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