root / qemu-sockets.c @ 64adab3f
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/*
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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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#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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strcpy(addr,"");
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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 (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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|
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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 (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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|
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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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|
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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); |
| 287 |
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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|
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/* connect to peer */
|
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if (connect(sock,e->ai_addr,e->ai_addrlen) < 0) { |
| 296 |
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)); |
| 300 |
closesocket(sock); |
| 301 |
continue;
|
| 302 |
} |
| 303 |
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); |
| 307 |
freeaddrinfo(res); |
| 308 |
return sock;
|
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} |
| 310 |
freeaddrinfo(res); |
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return -1; |
| 312 |
} |
| 313 |
|
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#ifndef _WIN32
|
| 315 |
|
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int unix_listen(const char *str, char *ostr, int olen) |
| 317 |
{
|
| 318 |
struct sockaddr_un un;
|
| 319 |
char *path, *opts;
|
| 320 |
int sock, fd, len;
|
| 321 |
|
| 322 |
sock = socket(PF_UNIX, SOCK_STREAM, 0);
|
| 323 |
if (sock < 0) { |
| 324 |
perror("socket(unix)");
|
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return -1; |
| 326 |
} |
| 327 |
|
| 328 |
opts = strchr(str, ',');
|
| 329 |
if (opts) {
|
| 330 |
len = opts - str; |
| 331 |
path = malloc(len+1);
|
| 332 |
snprintf(path, len+1, "%.*s", len, str); |
| 333 |
} else
|
| 334 |
path = strdup(str); |
| 335 |
|
| 336 |
memset(&un, 0, sizeof(un)); |
| 337 |
un.sun_family = AF_UNIX; |
| 338 |
if (path && strlen(path)) {
|
| 339 |
snprintf(un.sun_path, sizeof(un.sun_path), "%s", path); |
| 340 |
} else {
|
| 341 |
char *tmpdir = getenv("TMPDIR"); |
| 342 |
snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX", |
| 343 |
tmpdir ? tmpdir : "/tmp");
|
| 344 |
/*
|
| 345 |
* This dummy fd usage silences the mktemp() unsecure warning.
|
| 346 |
* Using mkstemp() doesn't make things more secure here
|
| 347 |
* though. bind() complains about existing files, so we have
|
| 348 |
* to unlink first and thus re-open the race window. The
|
| 349 |
* worst case possible is bind() failing, i.e. a DoS attack.
|
| 350 |
*/
|
| 351 |
fd = mkstemp(un.sun_path); close(fd); |
| 352 |
} |
| 353 |
snprintf(ostr, olen, "%s%s", un.sun_path, opts ? opts : ""); |
| 354 |
|
| 355 |
unlink(un.sun_path); |
| 356 |
if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) { |
| 357 |
fprintf(stderr, "bind(unix:%s): %s\n", un.sun_path, strerror(errno));
|
| 358 |
goto err;
|
| 359 |
} |
| 360 |
if (listen(sock, 1) < 0) { |
| 361 |
fprintf(stderr, "listen(unix:%s): %s\n", un.sun_path, strerror(errno));
|
| 362 |
goto err;
|
| 363 |
} |
| 364 |
|
| 365 |
if (sockets_debug)
|
| 366 |
fprintf(stderr, "bind(unix:%s): OK\n", un.sun_path);
|
| 367 |
free(path); |
| 368 |
return sock;
|
| 369 |
|
| 370 |
err:
|
| 371 |
free(path); |
| 372 |
closesocket(sock); |
| 373 |
return -1; |
| 374 |
} |
| 375 |
|
| 376 |
int unix_connect(const char *path) |
| 377 |
{
|
| 378 |
struct sockaddr_un un;
|
| 379 |
int sock;
|
| 380 |
|
| 381 |
sock = socket(PF_UNIX, SOCK_STREAM, 0);
|
| 382 |
if (sock < 0) { |
| 383 |
perror("socket(unix)");
|
| 384 |
return -1; |
| 385 |
} |
| 386 |
|
| 387 |
memset(&un, 0, sizeof(un)); |
| 388 |
un.sun_family = AF_UNIX; |
| 389 |
snprintf(un.sun_path, sizeof(un.sun_path), "%s", path); |
| 390 |
if (connect(sock, (struct sockaddr*) &un, sizeof(un)) < 0) { |
| 391 |
fprintf(stderr, "connect(unix:%s): %s\n", path, strerror(errno));
|
| 392 |
return -1; |
| 393 |
} |
| 394 |
|
| 395 |
if (sockets_debug)
|
| 396 |
fprintf(stderr, "connect(unix:%s): OK\n", path);
|
| 397 |
return sock;
|
| 398 |
} |
| 399 |
|
| 400 |
#else
|
| 401 |
|
| 402 |
int unix_listen(const char *path, char *ostr, int olen) |
| 403 |
{
|
| 404 |
fprintf(stderr, "unix sockets are not available on windows\n");
|
| 405 |
return -1; |
| 406 |
} |
| 407 |
|
| 408 |
int unix_connect(const char *path) |
| 409 |
{
|
| 410 |
fprintf(stderr, "unix sockets are not available on windows\n");
|
| 411 |
return -1; |
| 412 |
} |
| 413 |
|
| 414 |
#endif
|