mirror of
https://github.com/qemu/qemu.git
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bc575e95d1
git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6300 c046a42c-6fe2-441c-8c8c-71466251a162
416 lines
12 KiB
C
416 lines
12 KiB
C
/*
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* inet and unix socket functions for qemu
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*
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* (c) 2008 Gerd Hoffmann <kraxel@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; under version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#include <unistd.h>
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#include "qemu_socket.h"
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#include "qemu-common.h" /* for qemu_isdigit */
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#ifndef AI_ADDRCONFIG
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# define AI_ADDRCONFIG 0
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#endif
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static int sockets_debug = 0;
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static const int on=1, off=0;
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static int inet_getport(struct addrinfo *e)
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{
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struct sockaddr_in *i4;
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struct sockaddr_in6 *i6;
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switch (e->ai_family) {
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case PF_INET6:
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i6 = (void*)e->ai_addr;
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return ntohs(i6->sin6_port);
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case PF_INET:
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i4 = (void*)e->ai_addr;
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return ntohs(i4->sin_port);
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default:
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return 0;
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}
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}
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static void inet_setport(struct addrinfo *e, int port)
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{
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struct sockaddr_in *i4;
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struct sockaddr_in6 *i6;
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switch (e->ai_family) {
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case PF_INET6:
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i6 = (void*)e->ai_addr;
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i6->sin6_port = htons(port);
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break;
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case PF_INET:
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i4 = (void*)e->ai_addr;
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i4->sin_port = htons(port);
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break;
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}
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}
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static const char *inet_strfamily(int family)
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{
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switch (family) {
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case PF_INET6: return "ipv6";
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case PF_INET: return "ipv4";
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case PF_UNIX: return "unix";
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}
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return "????";
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}
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static void inet_print_addrinfo(const char *tag, struct addrinfo *res)
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{
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struct addrinfo *e;
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char uaddr[INET6_ADDRSTRLEN+1];
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char uport[33];
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for (e = res; e != NULL; e = e->ai_next) {
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getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
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uaddr,INET6_ADDRSTRLEN,uport,32,
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NI_NUMERICHOST | NI_NUMERICSERV);
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fprintf(stderr,"%s: getaddrinfo: family %s, host %s, port %s\n",
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tag, inet_strfamily(e->ai_family), uaddr, uport);
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}
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}
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int inet_listen(const char *str, char *ostr, int olen,
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int socktype, int port_offset)
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{
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struct addrinfo ai,*res,*e;
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char addr[64];
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char port[33];
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char uaddr[INET6_ADDRSTRLEN+1];
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char uport[33];
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const char *opts, *h;
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int slisten,rc,pos,to,try_next;
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memset(&ai,0, sizeof(ai));
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ai.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
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ai.ai_family = PF_UNSPEC;
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ai.ai_socktype = socktype;
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/* parse address */
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if (str[0] == ':') {
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/* no host given */
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addr[0] = '\0';
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if (1 != sscanf(str,":%32[^,]%n",port,&pos)) {
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fprintf(stderr, "%s: portonly parse error (%s)\n",
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__FUNCTION__, str);
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return -1;
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}
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} else if (str[0] == '[') {
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/* IPv6 addr */
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if (2 != sscanf(str,"[%64[^]]]:%32[^,]%n",addr,port,&pos)) {
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fprintf(stderr, "%s: ipv6 parse error (%s)\n",
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__FUNCTION__, str);
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return -1;
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}
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ai.ai_family = PF_INET6;
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} else if (qemu_isdigit(str[0])) {
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/* IPv4 addr */
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if (2 != sscanf(str,"%64[0-9.]:%32[^,]%n",addr,port,&pos)) {
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fprintf(stderr, "%s: ipv4 parse error (%s)\n",
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__FUNCTION__, str);
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return -1;
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}
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ai.ai_family = PF_INET;
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} else {
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/* hostname */
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if (2 != sscanf(str,"%64[^:]:%32[^,]%n",addr,port,&pos)) {
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fprintf(stderr, "%s: hostname parse error (%s)\n",
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__FUNCTION__, str);
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return -1;
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}
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}
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/* parse options */
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opts = str + pos;
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h = strstr(opts, ",to=");
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to = h ? atoi(h+4) : 0;
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if (strstr(opts, ",ipv4"))
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ai.ai_family = PF_INET;
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if (strstr(opts, ",ipv6"))
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ai.ai_family = PF_INET6;
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/* lookup */
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if (port_offset)
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snprintf(port, sizeof(port), "%d", atoi(port) + port_offset);
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rc = getaddrinfo(strlen(addr) ? addr : NULL, port, &ai, &res);
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if (rc != 0) {
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fprintf(stderr,"%s: getaddrinfo(%s,%s): %s\n", __FUNCTION__,
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addr, port, gai_strerror(rc));
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return -1;
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}
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if (sockets_debug)
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inet_print_addrinfo(__FUNCTION__, res);
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/* create socket + bind */
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for (e = res; e != NULL; e = e->ai_next) {
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getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
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uaddr,INET6_ADDRSTRLEN,uport,32,
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NI_NUMERICHOST | NI_NUMERICSERV);
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slisten = socket(e->ai_family, e->ai_socktype, e->ai_protocol);
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if (slisten < 0) {
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fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
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inet_strfamily(e->ai_family), strerror(errno));
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continue;
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}
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setsockopt(slisten,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
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#ifdef IPV6_V6ONLY
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if (e->ai_family == PF_INET6) {
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/* listen on both ipv4 and ipv6 */
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setsockopt(slisten,IPPROTO_IPV6,IPV6_V6ONLY,(void*)&off,sizeof(off));
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}
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#endif
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for (;;) {
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if (bind(slisten, e->ai_addr, e->ai_addrlen) == 0) {
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if (sockets_debug)
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fprintf(stderr,"%s: bind(%s,%s,%d): OK\n", __FUNCTION__,
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inet_strfamily(e->ai_family), uaddr, inet_getport(e));
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goto listen;
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}
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try_next = to && (inet_getport(e) <= to + port_offset);
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if (!try_next || sockets_debug)
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fprintf(stderr,"%s: bind(%s,%s,%d): %s\n", __FUNCTION__,
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inet_strfamily(e->ai_family), uaddr, inet_getport(e),
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strerror(errno));
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if (try_next) {
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inet_setport(e, inet_getport(e) + 1);
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continue;
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}
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break;
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}
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closesocket(slisten);
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}
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fprintf(stderr, "%s: FAILED\n", __FUNCTION__);
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freeaddrinfo(res);
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return -1;
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listen:
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if (listen(slisten,1) != 0) {
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perror("listen");
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closesocket(slisten);
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return -1;
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}
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if (ostr) {
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if (e->ai_family == PF_INET6) {
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snprintf(ostr, olen, "[%s]:%d%s", uaddr,
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inet_getport(e) - port_offset, opts);
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} else {
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snprintf(ostr, olen, "%s:%d%s", uaddr,
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inet_getport(e) - port_offset, opts);
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}
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}
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freeaddrinfo(res);
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return slisten;
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}
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int inet_connect(const char *str, int socktype)
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{
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struct addrinfo ai,*res,*e;
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char addr[64];
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char port[33];
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char uaddr[INET6_ADDRSTRLEN+1];
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char uport[33];
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int sock,rc;
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memset(&ai,0, sizeof(ai));
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ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG;
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ai.ai_family = PF_UNSPEC;
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ai.ai_socktype = socktype;
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/* parse address */
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if (str[0] == '[') {
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/* IPv6 addr */
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if (2 != sscanf(str,"[%64[^]]]:%32[^,]",addr,port)) {
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fprintf(stderr, "%s: ipv6 parse error (%s)\n",
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__FUNCTION__, str);
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return -1;
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}
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ai.ai_family = PF_INET6;
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} else if (qemu_isdigit(str[0])) {
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/* IPv4 addr */
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if (2 != sscanf(str,"%64[0-9.]:%32[^,]",addr,port)) {
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fprintf(stderr, "%s: ipv4 parse error (%s)\n",
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__FUNCTION__, str);
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return -1;
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}
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ai.ai_family = PF_INET;
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} else {
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/* hostname */
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if (2 != sscanf(str,"%64[^:]:%32[^,]",addr,port)) {
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fprintf(stderr, "%s: hostname parse error (%s)\n",
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__FUNCTION__, str);
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return -1;
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}
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}
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/* parse options */
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if (strstr(str, ",ipv4"))
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ai.ai_family = PF_INET;
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if (strstr(str, ",ipv6"))
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ai.ai_family = PF_INET6;
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/* lookup */
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if (0 != (rc = getaddrinfo(addr, port, &ai, &res))) {
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fprintf(stderr,"getaddrinfo(%s,%s): %s\n", gai_strerror(rc),
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addr, port);
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return -1;
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}
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if (sockets_debug)
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inet_print_addrinfo(__FUNCTION__, res);
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for (e = res; e != NULL; e = e->ai_next) {
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if (getnameinfo((struct sockaddr*)e->ai_addr,e->ai_addrlen,
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uaddr,INET6_ADDRSTRLEN,uport,32,
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NI_NUMERICHOST | NI_NUMERICSERV) != 0) {
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fprintf(stderr,"%s: getnameinfo: oops\n", __FUNCTION__);
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continue;
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}
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sock = socket(e->ai_family, e->ai_socktype, e->ai_protocol);
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if (sock < 0) {
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fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
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inet_strfamily(e->ai_family), strerror(errno));
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continue;
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}
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setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on));
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/* connect to peer */
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if (connect(sock,e->ai_addr,e->ai_addrlen) < 0) {
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if (sockets_debug || NULL == e->ai_next)
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fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", __FUNCTION__,
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inet_strfamily(e->ai_family),
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e->ai_canonname, uaddr, uport, strerror(errno));
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closesocket(sock);
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continue;
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}
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if (sockets_debug)
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fprintf(stderr, "%s: connect(%s,%s,%s,%s): OK\n", __FUNCTION__,
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inet_strfamily(e->ai_family),
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e->ai_canonname, uaddr, uport);
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freeaddrinfo(res);
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return sock;
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}
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freeaddrinfo(res);
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return -1;
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}
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#ifndef _WIN32
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int unix_listen(const char *str, char *ostr, int olen)
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{
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struct sockaddr_un un;
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char *path, *opts;
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int sock, fd, len;
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sock = socket(PF_UNIX, SOCK_STREAM, 0);
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if (sock < 0) {
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perror("socket(unix)");
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return -1;
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}
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opts = strchr(str, ',');
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if (opts) {
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len = opts - str;
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path = malloc(len+1);
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snprintf(path, len+1, "%.*s", len, str);
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} else
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path = strdup(str);
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memset(&un, 0, sizeof(un));
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un.sun_family = AF_UNIX;
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if (path && strlen(path)) {
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snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
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} else {
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char *tmpdir = getenv("TMPDIR");
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snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX",
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tmpdir ? tmpdir : "/tmp");
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/*
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* This dummy fd usage silences the mktemp() unsecure warning.
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* Using mkstemp() doesn't make things more secure here
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* though. bind() complains about existing files, so we have
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* to unlink first and thus re-open the race window. The
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* worst case possible is bind() failing, i.e. a DoS attack.
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*/
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fd = mkstemp(un.sun_path); close(fd);
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}
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snprintf(ostr, olen, "%s%s", un.sun_path, opts ? opts : "");
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unlink(un.sun_path);
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if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
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fprintf(stderr, "bind(unix:%s): %s\n", un.sun_path, strerror(errno));
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goto err;
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}
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if (listen(sock, 1) < 0) {
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fprintf(stderr, "listen(unix:%s): %s\n", un.sun_path, strerror(errno));
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goto err;
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}
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if (sockets_debug)
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fprintf(stderr, "bind(unix:%s): OK\n", un.sun_path);
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free(path);
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return sock;
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err:
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free(path);
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closesocket(sock);
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return -1;
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}
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int unix_connect(const char *path)
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{
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struct sockaddr_un un;
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int sock;
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sock = socket(PF_UNIX, SOCK_STREAM, 0);
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if (sock < 0) {
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perror("socket(unix)");
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return -1;
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}
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memset(&un, 0, sizeof(un));
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un.sun_family = AF_UNIX;
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snprintf(un.sun_path, sizeof(un.sun_path), "%s", path);
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if (connect(sock, (struct sockaddr*) &un, sizeof(un)) < 0) {
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fprintf(stderr, "connect(unix:%s): %s\n", path, strerror(errno));
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return -1;
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}
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if (sockets_debug)
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fprintf(stderr, "connect(unix:%s): OK\n", path);
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return sock;
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}
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#else
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int unix_listen(const char *path, char *ostr, int olen)
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{
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fprintf(stderr, "unix sockets are not available on windows\n");
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return -1;
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}
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int unix_connect(const char *path)
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{
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fprintf(stderr, "unix sockets are not available on windows\n");
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return -1;
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}
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#endif
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