/* * inet and unix socket functions for qemu * * (c) 2008 Gerd Hoffmann * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; under version 2 of the License. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include #include #include #include #include #include #include "qemu_socket.h" #include "qemu-common.h" /* for qemu_isdigit */ #ifndef AI_ADDRCONFIG # define AI_ADDRCONFIG 0 #endif static int sockets_debug = 0; static const int on=1, off=0; /* used temporarely until all users are converted to QemuOpts */ static QemuOptsList dummy_opts = { .name = "dummy", .head = QTAILQ_HEAD_INITIALIZER(dummy_opts.head), .desc = { { .name = "path", .type = QEMU_OPT_STRING, },{ .name = "host", .type = QEMU_OPT_STRING, },{ .name = "port", .type = QEMU_OPT_STRING, },{ .name = "to", .type = QEMU_OPT_NUMBER, },{ .name = "ipv4", .type = QEMU_OPT_BOOL, },{ .name = "ipv6", .type = QEMU_OPT_BOOL, }, { /* end if list */ } }, }; 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; } } 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_opts(QemuOpts *opts, int port_offset) { struct addrinfo ai,*res,*e; const char *addr; char port[33]; char uaddr[INET6_ADDRSTRLEN+1]; char uport[33]; int slisten,rc,to,try_next; memset(&ai,0, sizeof(ai)); ai.ai_flags = AI_PASSIVE | AI_ADDRCONFIG; ai.ai_family = PF_UNSPEC; ai.ai_socktype = SOCK_STREAM; if (qemu_opt_get(opts, "port") == NULL) { fprintf(stderr, "%s: host and/or port not specified\n", __FUNCTION__); return -1; } pstrcpy(port, sizeof(port), qemu_opt_get(opts, "port")); addr = qemu_opt_get(opts, "host"); to = qemu_opt_get_number(opts, "to", 0); if (qemu_opt_get_bool(opts, "ipv4", 0)) ai.ai_family = PF_INET; if (qemu_opt_get_bool(opts, "ipv6", 0)) ai.ai_family = PF_INET6; /* lookup */ if (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,"getaddrinfo(%s,%s): %s\n", 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 = qemu_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); freeaddrinfo(res); return -1; } snprintf(uport, sizeof(uport), "%d", inet_getport(e) - port_offset); qemu_opt_set(opts, "host", uaddr); qemu_opt_set(opts, "port", uport); qemu_opt_set(opts, "ipv6", (e->ai_family == PF_INET6) ? "on" : "off"); qemu_opt_set(opts, "ipv4", (e->ai_family != PF_INET6) ? "on" : "off"); freeaddrinfo(res); return slisten; } int inet_connect_opts(QemuOpts *opts) { struct addrinfo ai,*res,*e; const char *addr; const char *port; 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 = SOCK_STREAM; addr = qemu_opt_get(opts, "host"); port = qemu_opt_get(opts, "port"); if (addr == NULL || port == NULL) { fprintf(stderr, "inet_connect: host and/or port not specified\n"); return -1; } if (qemu_opt_get_bool(opts, "ipv4", 0)) ai.ai_family = PF_INET; if (qemu_opt_get_bool(opts, "ipv6", 0)) ai.ai_family = PF_INET6; /* lookup */ if (0 != (rc = getaddrinfo(addr, port, &ai, &res))) { fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port, gai_strerror(rc)); 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 = qemu_socket(e->ai_family, e->ai_socktype, e->ai_protocol); if (sock < 0) { fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__, inet_strfamily(e->ai_family), strerror(errno)); continue; } setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on)); /* 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; } int inet_dgram_opts(QemuOpts *opts) { struct addrinfo ai, *peer = NULL, *local = NULL; const char *addr; const char *port; char uaddr[INET6_ADDRSTRLEN+1]; char uport[33]; int sock = -1, rc; /* lookup peer addr */ memset(&ai,0, sizeof(ai)); ai.ai_flags = AI_CANONNAME | AI_ADDRCONFIG; ai.ai_family = PF_UNSPEC; ai.ai_socktype = SOCK_DGRAM; addr = qemu_opt_get(opts, "host"); port = qemu_opt_get(opts, "port"); if (addr == NULL || strlen(addr) == 0) { addr = "localhost"; } if (port == NULL || strlen(port) == 0) { fprintf(stderr, "inet_dgram: port not specified\n"); return -1; } if (qemu_opt_get_bool(opts, "ipv4", 0)) ai.ai_family = PF_INET; if (qemu_opt_get_bool(opts, "ipv6", 0)) ai.ai_family = PF_INET6; if (0 != (rc = getaddrinfo(addr, port, &ai, &peer))) { fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port, gai_strerror(rc)); return -1; } if (sockets_debug) { fprintf(stderr, "%s: peer (%s:%s)\n", __FUNCTION__, addr, port); inet_print_addrinfo(__FUNCTION__, peer); } /* lookup local addr */ memset(&ai,0, sizeof(ai)); ai.ai_flags = AI_PASSIVE; ai.ai_family = peer->ai_family; ai.ai_socktype = SOCK_DGRAM; addr = qemu_opt_get(opts, "localaddr"); port = qemu_opt_get(opts, "localport"); if (addr == NULL || strlen(addr) == 0) { addr = NULL; } if (!port || strlen(port) == 0) port = "0"; if (0 != (rc = getaddrinfo(addr, port, &ai, &local))) { fprintf(stderr,"getaddrinfo(%s,%s): %s\n", addr, port, gai_strerror(rc)); return -1; } if (sockets_debug) { fprintf(stderr, "%s: local (%s:%s)\n", __FUNCTION__, addr, port); inet_print_addrinfo(__FUNCTION__, local); } /* create socket */ sock = qemu_socket(peer->ai_family, peer->ai_socktype, peer->ai_protocol); if (sock < 0) { fprintf(stderr,"%s: socket(%s): %s\n", __FUNCTION__, inet_strfamily(peer->ai_family), strerror(errno)); goto err; } setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,(void*)&on,sizeof(on)); /* bind socket */ if (getnameinfo((struct sockaddr*)local->ai_addr,local->ai_addrlen, uaddr,INET6_ADDRSTRLEN,uport,32, NI_NUMERICHOST | NI_NUMERICSERV) != 0) { fprintf(stderr, "%s: getnameinfo: oops\n", __FUNCTION__); goto err; } if (bind(sock, local->ai_addr, local->ai_addrlen) < 0) { fprintf(stderr,"%s: bind(%s,%s,%d): OK\n", __FUNCTION__, inet_strfamily(local->ai_family), uaddr, inet_getport(local)); goto err; } /* connect to peer */ if (getnameinfo((struct sockaddr*)peer->ai_addr, peer->ai_addrlen, uaddr, INET6_ADDRSTRLEN, uport, 32, NI_NUMERICHOST | NI_NUMERICSERV) != 0) { fprintf(stderr, "%s: getnameinfo: oops\n", __FUNCTION__); goto err; } if (connect(sock,peer->ai_addr,peer->ai_addrlen) < 0) { fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", __FUNCTION__, inet_strfamily(peer->ai_family), peer->ai_canonname, uaddr, uport, strerror(errno)); goto err; } freeaddrinfo(local); freeaddrinfo(peer); return sock; err: if (-1 != sock) closesocket(sock); if (local) freeaddrinfo(local); if (peer) freeaddrinfo(peer); return -1; } /* compatibility wrapper */ static int inet_parse(QemuOpts *opts, const char *str) { const char *optstr, *h; char addr[64]; char port[33]; int pos; /* parse address */ if (str[0] == ':') { /* no host given */ addr[0] = '\0'; 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; } qemu_opt_set(opts, "ipv6", "yes"); } else if (qemu_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; } qemu_opt_set(opts, "ipv4", "yes"); } else { /* hostname */ if (2 != sscanf(str,"%64[^:]:%32[^,]%n",addr,port,&pos)) { fprintf(stderr, "%s: hostname parse error (%s)\n", __FUNCTION__, str); return -1; } } qemu_opt_set(opts, "host", addr); qemu_opt_set(opts, "port", port); /* parse options */ optstr = str + pos; h = strstr(optstr, ",to="); if (h) qemu_opt_set(opts, "to", h+4); if (strstr(optstr, ",ipv4")) qemu_opt_set(opts, "ipv4", "yes"); if (strstr(optstr, ",ipv6")) qemu_opt_set(opts, "ipv6", "yes"); return 0; } int inet_listen(const char *str, char *ostr, int olen, int socktype, int port_offset) { QemuOpts *opts; char *optstr; int sock = -1; opts = qemu_opts_create(&dummy_opts, NULL, 0); if (inet_parse(opts, str) == 0) { sock = inet_listen_opts(opts, port_offset); if (sock != -1 && ostr) { optstr = strchr(str, ','); if (qemu_opt_get_bool(opts, "ipv6", 0)) { snprintf(ostr, olen, "[%s]:%s%s", qemu_opt_get(opts, "host"), qemu_opt_get(opts, "port"), optstr ? optstr : ""); } else { snprintf(ostr, olen, "%s:%s%s", qemu_opt_get(opts, "host"), qemu_opt_get(opts, "port"), optstr ? optstr : ""); } } } qemu_opts_del(opts); return sock; } int inet_connect(const char *str, int socktype) { QemuOpts *opts; int sock = -1; opts = qemu_opts_create(&dummy_opts, NULL, 0); if (inet_parse(opts, str) == 0) sock = inet_connect_opts(opts); qemu_opts_del(opts); return sock; } #ifndef _WIN32 int unix_listen_opts(QemuOpts *opts) { struct sockaddr_un un; const char *path = qemu_opt_get(opts, "path"); int sock, fd; sock = qemu_socket(PF_UNIX, SOCK_STREAM, 0); if (sock < 0) { perror("socket(unix)"); return -1; } 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); qemu_opt_set(opts, "path", un.sun_path); } 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); return sock; err: closesocket(sock); return -1; } int unix_connect_opts(QemuOpts *opts) { struct sockaddr_un un; const char *path = qemu_opt_get(opts, "path"); int sock; if (NULL == path) { fprintf(stderr, "unix connect: no path specified\n"); return -1; } sock = qemu_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; } /* compatibility wrapper */ int unix_listen(const char *str, char *ostr, int olen) { QemuOpts *opts; char *path, *optstr; int sock, len; opts = qemu_opts_create(&dummy_opts, NULL, 0); optstr = strchr(str, ','); if (optstr) { len = optstr - str; if (len) { path = qemu_malloc(len+1); snprintf(path, len+1, "%.*s", len, str); qemu_opt_set(opts, "path", path); qemu_free(path); } } else { qemu_opt_set(opts, "path", str); } sock = unix_listen_opts(opts); if (sock != -1 && ostr) snprintf(ostr, olen, "%s%s", qemu_opt_get(opts, "path"), optstr ? optstr : ""); qemu_opts_del(opts); return sock; } int unix_connect(const char *path) { QemuOpts *opts; int sock; opts = qemu_opts_create(&dummy_opts, NULL, 0); qemu_opt_set(opts, "path", path); sock = unix_connect_opts(opts); qemu_opts_del(opts); return sock; } #else int unix_listen_opts(QemuOpts *opts) { fprintf(stderr, "unix sockets are not available on windows\n"); return -1; } int unix_connect_opts(QemuOpts *opts) { fprintf(stderr, "unix sockets are not available on windows\n"); return -1; } 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