root / qemu-sockets.c @ 108af7b9
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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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#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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|
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/* used temporarely until all users are converted to QemuOpts */
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QemuOptsList dummy_opts = { |
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.name = "dummy",
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.head = TAILQ_HEAD_INITIALIZER(dummy_opts.head), |
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.desc = { |
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{ |
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.name = "path",
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.type = QEMU_OPT_STRING, |
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}, |
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{ /* end if list */ }
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}, |
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}; |
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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,
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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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freeaddrinfo(res); |
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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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|
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/* parse options */
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if (strstr(str, ",ipv4")) |
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ai.ai_family = PF_INET; |
283 |
if (strstr(str, ",ipv6")) |
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ai.ai_family = PF_INET6; |
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|
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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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} |
292 |
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) { |
296 |
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); |
303 |
if (sock < 0) { |
304 |
fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__,
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inet_strfamily(e->ai_family), strerror(errno)); |
306 |
continue;
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} |
308 |
setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on)); |
309 |
|
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/* connect to peer */
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if (connect(sock,e->ai_addr,e->ai_addrlen) < 0) { |
312 |
if (sockets_debug || NULL == e->ai_next) |
313 |
fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", __FUNCTION__,
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inet_strfamily(e->ai_family), |
315 |
e->ai_canonname, uaddr, uport, strerror(errno)); |
316 |
closesocket(sock); |
317 |
continue;
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318 |
} |
319 |
if (sockets_debug)
|
320 |
fprintf(stderr, "%s: connect(%s,%s,%s,%s): OK\n", __FUNCTION__,
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321 |
inet_strfamily(e->ai_family), |
322 |
e->ai_canonname, uaddr, uport); |
323 |
freeaddrinfo(res); |
324 |
return sock;
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} |
326 |
freeaddrinfo(res); |
327 |
return -1; |
328 |
} |
329 |
|
330 |
#ifndef _WIN32
|
331 |
|
332 |
int unix_listen_opts(QemuOpts *opts)
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333 |
{ |
334 |
struct sockaddr_un un;
|
335 |
const char *path = qemu_opt_get(opts, "path"); |
336 |
int sock, fd;
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337 |
|
338 |
sock = socket(PF_UNIX, SOCK_STREAM, 0);
|
339 |
if (sock < 0) { |
340 |
perror("socket(unix)");
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341 |
return -1; |
342 |
} |
343 |
|
344 |
memset(&un, 0, sizeof(un)); |
345 |
un.sun_family = AF_UNIX; |
346 |
if (path && strlen(path)) {
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347 |
snprintf(un.sun_path, sizeof(un.sun_path), "%s", path); |
348 |
} else {
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349 |
char *tmpdir = getenv("TMPDIR"); |
350 |
snprintf(un.sun_path, sizeof(un.sun_path), "%s/qemu-socket-XXXXXX", |
351 |
tmpdir ? tmpdir : "/tmp");
|
352 |
/*
|
353 |
* This dummy fd usage silences the mktemp() unsecure warning.
|
354 |
* Using mkstemp() doesn't make things more secure here
|
355 |
* though. bind() complains about existing files, so we have
|
356 |
* to unlink first and thus re-open the race window. The
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357 |
* worst case possible is bind() failing, i.e. a DoS attack.
|
358 |
*/
|
359 |
fd = mkstemp(un.sun_path); close(fd); |
360 |
qemu_opt_set(opts, "path", un.sun_path);
|
361 |
} |
362 |
|
363 |
unlink(un.sun_path); |
364 |
if (bind(sock, (struct sockaddr*) &un, sizeof(un)) < 0) { |
365 |
fprintf(stderr, "bind(unix:%s): %s\n", un.sun_path, strerror(errno));
|
366 |
goto err;
|
367 |
} |
368 |
if (listen(sock, 1) < 0) { |
369 |
fprintf(stderr, "listen(unix:%s): %s\n", un.sun_path, strerror(errno));
|
370 |
goto err;
|
371 |
} |
372 |
|
373 |
if (sockets_debug)
|
374 |
fprintf(stderr, "bind(unix:%s): OK\n", un.sun_path);
|
375 |
return sock;
|
376 |
|
377 |
err:
|
378 |
closesocket(sock); |
379 |
return -1; |
380 |
} |
381 |
|
382 |
int unix_connect_opts(QemuOpts *opts)
|
383 |
{ |
384 |
struct sockaddr_un un;
|
385 |
const char *path = qemu_opt_get(opts, "path"); |
386 |
int sock;
|
387 |
|
388 |
if (NULL == path) { |
389 |
fprintf(stderr, "unix connect: no path specified\n");
|
390 |
return -1; |
391 |
} |
392 |
|
393 |
sock = socket(PF_UNIX, SOCK_STREAM, 0);
|
394 |
if (sock < 0) { |
395 |
perror("socket(unix)");
|
396 |
return -1; |
397 |
} |
398 |
|
399 |
memset(&un, 0, sizeof(un)); |
400 |
un.sun_family = AF_UNIX; |
401 |
snprintf(un.sun_path, sizeof(un.sun_path), "%s", path); |
402 |
if (connect(sock, (struct sockaddr*) &un, sizeof(un)) < 0) { |
403 |
fprintf(stderr, "connect(unix:%s): %s\n", path, strerror(errno));
|
404 |
return -1; |
405 |
} |
406 |
|
407 |
if (sockets_debug)
|
408 |
fprintf(stderr, "connect(unix:%s): OK\n", path);
|
409 |
return sock;
|
410 |
} |
411 |
|
412 |
/* compatibility wrapper */
|
413 |
int unix_listen(const char *str, char *ostr, int olen) |
414 |
{ |
415 |
QemuOpts *opts; |
416 |
char *path, *optstr;
|
417 |
int sock, len;
|
418 |
|
419 |
opts = qemu_opts_create(&dummy_opts, NULL, 0); |
420 |
|
421 |
optstr = strchr(str, ',');
|
422 |
if (optstr) {
|
423 |
len = optstr - str; |
424 |
if (len) {
|
425 |
path = qemu_malloc(len+1);
|
426 |
snprintf(path, len+1, "%.*s", len, str); |
427 |
qemu_opt_set(opts, "path", path);
|
428 |
qemu_free(path); |
429 |
} |
430 |
} else {
|
431 |
qemu_opt_set(opts, "path", str);
|
432 |
} |
433 |
|
434 |
sock = unix_listen_opts(opts); |
435 |
|
436 |
if (sock != -1 && ostr) |
437 |
snprintf(ostr, olen, "%s%s", qemu_opt_get(opts, "path"), optstr ? optstr : ""); |
438 |
qemu_opts_del(opts); |
439 |
return sock;
|
440 |
} |
441 |
|
442 |
int unix_connect(const char *path) |
443 |
{ |
444 |
QemuOpts *opts; |
445 |
int sock;
|
446 |
|
447 |
opts = qemu_opts_create(&dummy_opts, NULL, 0); |
448 |
qemu_opt_set(opts, "path", path);
|
449 |
sock = unix_connect_opts(opts); |
450 |
qemu_opts_del(opts); |
451 |
return sock;
|
452 |
} |
453 |
|
454 |
#else
|
455 |
|
456 |
int unix_listen_opts(QemuOpts *opts)
|
457 |
{ |
458 |
fprintf(stderr, "unix sockets are not available on windows\n");
|
459 |
return -1; |
460 |
} |
461 |
|
462 |
int unix_connect_opts(QemuOpts *opts)
|
463 |
{ |
464 |
fprintf(stderr, "unix sockets are not available on windows\n");
|
465 |
return -1; |
466 |
} |
467 |
|
468 |
int unix_listen(const char *path, char *ostr, int olen) |
469 |
{ |
470 |
fprintf(stderr, "unix sockets are not available on windows\n");
|
471 |
return -1; |
472 |
} |
473 |
|
474 |
int unix_connect(const char *path) |
475 |
{ |
476 |
fprintf(stderr, "unix sockets are not available on windows\n");
|
477 |
return -1; |
478 |
} |
479 |
|
480 |
#endif
|