| /* |
| Copyright (C) 2002-2010 Karl J. Runge <runge@karlrunge.com> |
| All rights reserved. |
| |
| This file is part of x11vnc. |
| |
| x11vnc 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; either version 2 of the License, or (at |
| your option) any later version. |
| |
| x11vnc 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. |
| |
| You should have received a copy of the GNU General Public License |
| along with x11vnc; if not, write to the Free Software |
| Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA |
| or see <http://www.gnu.org/licenses/>. |
| |
| In addition, as a special exception, Karl J. Runge |
| gives permission to link the code of its release of x11vnc with the |
| OpenSSL project's "OpenSSL" library (or with modified versions of it |
| that use the same license as the "OpenSSL" library), and distribute |
| the linked executables. You must obey the GNU General Public License |
| in all respects for all of the code used other than "OpenSSL". If you |
| modify this file, you may extend this exception to your version of the |
| file, but you are not obligated to do so. If you do not wish to do |
| so, delete this exception statement from your version. |
| */ |
| |
| /* -- inet.c -- */ |
| |
| #include "x11vnc.h" |
| #include "unixpw.h" |
| #include "sslhelper.h" |
| |
| /* |
| * Simple utility to map host name to dotted IP address. Ignores aliases. |
| * Up to caller to free returned string. |
| */ |
| char *host2ip(char *host); |
| char *raw2host(char *raw, int len); |
| char *raw2ip(char *raw); |
| char *ip2host(char *ip); |
| int ipv6_ip(char *host); |
| int dotted_ip(char *host, int partial); |
| int get_remote_port(int sock); |
| int get_local_port(int sock); |
| char *get_remote_host(int sock); |
| char *get_local_host(int sock); |
| char *ident_username(rfbClientPtr client); |
| int find_free_port(int start, int end); |
| int find_free_port6(int start, int end); |
| int have_ssh_env(void); |
| char *ipv6_getnameinfo(struct sockaddr *paddr, int addrlen); |
| char *ipv6_getipaddr(struct sockaddr *paddr, int addrlen); |
| int listen6(int port); |
| int listen_unix(char *file); |
| int accept_unix(int s); |
| int connect_tcp(char *host, int port); |
| int listen_tcp(int port, in_addr_t iface, int try6); |
| |
| static int get_port(int sock, int remote); |
| static char *get_host(int sock, int remote); |
| |
| char *host2ip(char *host) { |
| struct hostent *hp; |
| struct sockaddr_in addr; |
| char *str; |
| |
| if (! host_lookup) { |
| return NULL; |
| } |
| |
| hp = gethostbyname(host); |
| if (!hp) { |
| return NULL; |
| } |
| memset(&addr, 0, sizeof(addr)); |
| addr.sin_family = AF_INET; |
| addr.sin_addr.s_addr = *(unsigned long *)hp->h_addr; |
| str = strdup(inet_ntoa(addr.sin_addr)); |
| return str; |
| } |
| |
| char *raw2host(char *raw, int len) { |
| char *str; |
| #if LIBVNCSERVER_HAVE_NETDB_H && LIBVNCSERVER_HAVE_NETINET_IN_H |
| struct hostent *hp; |
| |
| if (! host_lookup) { |
| return strdup("unknown"); |
| } |
| |
| hp = gethostbyaddr(raw, len, AF_INET); |
| if (!hp) { |
| return strdup(inet_ntoa(*((struct in_addr *)raw))); |
| } |
| str = strdup(hp->h_name); |
| #else |
| str = strdup("unknown"); |
| #endif |
| return str; |
| } |
| |
| char *raw2ip(char *raw) { |
| return strdup(inet_ntoa(*((struct in_addr *)raw))); |
| } |
| |
| char *ip2host(char *ip) { |
| char *str; |
| #if LIBVNCSERVER_HAVE_NETDB_H && LIBVNCSERVER_HAVE_NETINET_IN_H |
| struct hostent *hp; |
| in_addr_t iaddr; |
| |
| if (! host_lookup) { |
| return strdup("unknown"); |
| } |
| |
| iaddr = inet_addr(ip); |
| if (iaddr == htonl(INADDR_NONE)) { |
| return strdup("unknown"); |
| } |
| |
| hp = gethostbyaddr((char *)&iaddr, sizeof(in_addr_t), AF_INET); |
| if (!hp) { |
| return strdup("unknown"); |
| } |
| str = strdup(hp->h_name); |
| #else |
| str = strdup("unknown"); |
| #endif |
| return str; |
| } |
| |
| int ipv6_ip(char *host_in) { |
| char *p, *host, a[2]; |
| int ncol = 0, nhex = 0; |
| |
| if (host_in[0] == '[') { |
| host = host_in + 1; |
| } else { |
| host = host_in; |
| } |
| |
| if (strstr(host, "::ffff:") == host || strstr(host, "::FFFF:") == host) { |
| return dotted_ip(host + strlen("::ffff:"), 0); |
| } |
| |
| a[1] = '\0'; |
| |
| p = host; |
| while (*p != '\0' && *p != '%' && *p != ']') { |
| if (*p == ':') { |
| ncol++; |
| } else { |
| nhex++; |
| } |
| a[0] = *p; |
| if (strpbrk(a, ":abcdef0123456789") == a) { |
| p++; |
| continue; |
| } |
| return 0; |
| } |
| if (ncol < 2 || ncol > 8 || nhex == 0) { |
| return 0; |
| } else { |
| return 1; |
| } |
| } |
| |
| int dotted_ip(char *host, int partial) { |
| int len, dots = 0; |
| char *p = host; |
| |
| if (!host) { |
| return 0; |
| } |
| |
| if (!isdigit((unsigned char) host[0])) { |
| return 0; |
| } |
| |
| len = strlen(host); |
| if (!partial && !isdigit((unsigned char) host[len-1])) { |
| return 0; |
| } |
| |
| while (*p != '\0') { |
| if (*p == '.') dots++; |
| if (*p == '.' || isdigit((unsigned char) (*p))) { |
| p++; |
| continue; |
| } |
| return 0; |
| } |
| if (!partial && dots != 3) { |
| return 0; |
| } |
| return 1; |
| } |
| |
| static int get_port(int sock, int remote) { |
| struct sockaddr_in saddr; |
| unsigned int saddr_len; |
| int saddr_port; |
| |
| saddr_len = sizeof(saddr); |
| memset(&saddr, 0, sizeof(saddr)); |
| saddr_port = -1; |
| if (remote) { |
| if (!getpeername(sock, (struct sockaddr *)&saddr, &saddr_len)) { |
| saddr_port = ntohs(saddr.sin_port); |
| } |
| } else { |
| if (!getsockname(sock, (struct sockaddr *)&saddr, &saddr_len)) { |
| saddr_port = ntohs(saddr.sin_port); |
| } |
| } |
| return saddr_port; |
| } |
| |
| int get_remote_port(int sock) { |
| return get_port(sock, 1); |
| } |
| |
| int get_local_port(int sock) { |
| return get_port(sock, 0); |
| } |
| |
| static char *get_host(int sock, int remote) { |
| struct sockaddr_in saddr; |
| unsigned int saddr_len; |
| int saddr_port; |
| char *saddr_ip_str = NULL; |
| |
| saddr_len = sizeof(saddr); |
| memset(&saddr, 0, sizeof(saddr)); |
| saddr_port = -1; |
| #if LIBVNCSERVER_HAVE_NETINET_IN_H |
| if (remote) { |
| if (!getpeername(sock, (struct sockaddr *)&saddr, &saddr_len)) { |
| saddr_ip_str = inet_ntoa(saddr.sin_addr); |
| } |
| } else { |
| if (!getsockname(sock, (struct sockaddr *)&saddr, &saddr_len)) { |
| saddr_ip_str = inet_ntoa(saddr.sin_addr); |
| } |
| } |
| #endif |
| if (! saddr_ip_str) { |
| saddr_ip_str = "unknown"; |
| } |
| return strdup(saddr_ip_str); |
| } |
| |
| char *get_remote_host(int sock) { |
| return get_host(sock, 1); |
| } |
| |
| char *get_local_host(int sock) { |
| return get_host(sock, 0); |
| } |
| |
| char *ident_username(rfbClientPtr client) { |
| ClientData *cd = (ClientData *) client->clientData; |
| char *str, *newhost, *user = NULL, *newuser = NULL; |
| int len; |
| |
| if (cd) { |
| user = cd->username; |
| } |
| if (!user || *user == '\0') { |
| int n, sock, ok = 0; |
| int block = 0; |
| int refused = 0; |
| |
| /* |
| * need to check to see if the operation will block for |
| * a long time: a firewall may just ignore our packets. |
| */ |
| #if LIBVNCSERVER_HAVE_FORK |
| { pid_t pid, pidw; |
| int rc; |
| if ((pid = fork()) > 0) { |
| usleep(100 * 1000); /* 0.1 sec for quick success or refusal */ |
| pidw = waitpid(pid, &rc, WNOHANG); |
| if (pidw <= 0) { |
| usleep(1500 * 1000); /* 1.5 sec */ |
| pidw = waitpid(pid, &rc, WNOHANG); |
| if (pidw <= 0) { |
| int rc2; |
| rfbLog("ident_username: set block=1 (hung)\n"); |
| block = 1; |
| kill(pid, SIGTERM); |
| usleep(100 * 1000); |
| waitpid(pid, &rc2, WNOHANG); |
| } |
| } |
| if (pidw > 0 && !block) { |
| if (WIFEXITED(rc) && WEXITSTATUS(rc) == 1) { |
| rfbLog("ident_username: set refused=1 (exit)\n"); |
| refused = 1; |
| } |
| } |
| } else if (pid == -1) { |
| ; |
| } else { |
| /* child */ |
| signal(SIGHUP, SIG_DFL); |
| signal(SIGINT, SIG_DFL); |
| signal(SIGQUIT, SIG_DFL); |
| signal(SIGTERM, SIG_DFL); |
| |
| if ((sock = connect_tcp(client->host, 113)) < 0) { |
| exit(1); |
| } else { |
| close(sock); |
| exit(0); |
| } |
| } |
| } |
| #endif |
| if (block || refused) { |
| ; |
| } else if ((sock = connect_tcp(client->host, 113)) < 0) { |
| rfbLog("ident_username: could not connect to ident: %s:%d\n", |
| client->host, 113); |
| } else { |
| char msg[128]; |
| int ret; |
| fd_set rfds; |
| struct timeval tv; |
| int rport = get_remote_port(client->sock); |
| int lport = get_local_port(client->sock); |
| |
| sprintf(msg, "%d, %d\r\n", rport, lport); |
| n = write(sock, msg, strlen(msg)); |
| |
| FD_ZERO(&rfds); |
| FD_SET(sock, &rfds); |
| tv.tv_sec = 3; |
| tv.tv_usec = 0; |
| ret = select(sock+1, &rfds, NULL, NULL, &tv); |
| |
| if (ret > 0) { |
| int i; |
| char *q, *p; |
| for (i=0; i < (int) sizeof(msg); i++) { |
| msg[i] = '\0'; |
| } |
| usleep(250*1000); |
| n = read(sock, msg, 127); |
| close(sock); |
| if (n <= 0) goto badreply; |
| |
| /* 32782 , 6000 : USERID : UNIX :runge */ |
| q = strstr(msg, "USERID"); |
| if (!q) goto badreply; |
| q = strstr(q, ":"); |
| if (!q) goto badreply; |
| q++; |
| q = strstr(q, ":"); |
| if (!q) goto badreply; |
| q++; |
| q = lblanks(q); |
| p = q; |
| while (*p) { |
| if (*p == '\r' || *p == '\n') { |
| *p = '\0'; |
| } |
| p++; |
| } |
| ok = 1; |
| if (strlen(q) > 24) { |
| *(q+24) = '\0'; |
| } |
| newuser = strdup(q); |
| |
| badreply: |
| n = 0; /* avoid syntax error */ |
| } else { |
| close(sock); |
| } |
| } |
| if (! ok || !newuser) { |
| newuser = strdup("unknown-user"); |
| } |
| if (cd) { |
| if (cd->username) { |
| free(cd->username); |
| } |
| cd->username = newuser; |
| } |
| user = newuser; |
| } |
| if (!strcmp(user, "unknown-user") && cd && cd->unixname[0] != '\0') { |
| user = cd->unixname; |
| } |
| if (unixpw && openssl_last_ip && strstr("UNIX:", user) != user) { |
| newhost = ip2host(openssl_last_ip); |
| } else { |
| newhost = ip2host(client->host); |
| } |
| len = strlen(user) + 1 + strlen(newhost) + 1; |
| str = (char *) malloc(len); |
| sprintf(str, "%s@%s", user, newhost); |
| free(newhost); |
| return str; |
| } |
| |
| int find_free_port(int start, int end) { |
| int port; |
| if (start <= 0) { |
| start = 1024; |
| } |
| if (end <= 0) { |
| end = 65530; |
| } |
| for (port = start; port <= end; port++) { |
| int sock = listen_tcp(port, htonl(INADDR_ANY), 0); |
| if (sock >= 0) { |
| close(sock); |
| return port; |
| } |
| } |
| return 0; |
| } |
| |
| int find_free_port6(int start, int end) { |
| int port; |
| if (start <= 0) { |
| start = 1024; |
| } |
| if (end <= 0) { |
| end = 65530; |
| } |
| for (port = start; port <= end; port++) { |
| int sock = listen6(port); |
| if (sock >= 0) { |
| close(sock); |
| return port; |
| } |
| } |
| return 0; |
| } |
| |
| int have_ssh_env(void) { |
| char *str, *p = getenv("SSH_CONNECTION"); |
| char *rhost, *rport, *lhost, *lport; |
| |
| if (! p) { |
| char *q = getenv("SSH_CLIENT"); |
| if (! q) { |
| return 0; |
| } |
| if (strstr(q, "127.0.0.1") != NULL) { |
| return 0; |
| } |
| return 1; |
| } |
| |
| if (strstr(p, "127.0.0.1") != NULL) { |
| return 0; |
| } |
| |
| str = strdup(p); |
| |
| p = strtok(str, " "); |
| rhost = p; |
| |
| p = strtok(NULL, " "); |
| if (! p) goto fail; |
| |
| rport = p; |
| |
| p = strtok(NULL, " "); |
| if (! p) goto fail; |
| |
| lhost = p; |
| |
| p = strtok(NULL, " "); |
| if (! p) goto fail; |
| |
| lport = p; |
| |
| if (0) fprintf(stderr, "%d/%d - '%s' '%s'\n", atoi(rport), atoi(lport), rhost, lhost); |
| |
| if (atoi(rport) <= 16 || atoi(rport) > 65535) { |
| goto fail; |
| } |
| if (atoi(lport) <= 16 || atoi(lport) > 65535) { |
| goto fail; |
| } |
| |
| if (!strcmp(rhost, lhost)) { |
| goto fail; |
| } |
| |
| free(str); |
| |
| return 1; |
| |
| fail: |
| |
| free(str); |
| |
| return 0; |
| } |
| |
| char *ipv6_getnameinfo(struct sockaddr *paddr, int addrlen) { |
| #if X11VNC_IPV6 |
| char name[200]; |
| if (noipv6) { |
| return strdup("unknown"); |
| } |
| if (getnameinfo(paddr, addrlen, name, sizeof(name), NULL, 0, 0) == 0) { |
| return strdup(name); |
| } |
| #endif |
| return strdup("unknown"); |
| } |
| |
| char *ipv6_getipaddr(struct sockaddr *paddr, int addrlen) { |
| #if X11VNC_IPV6 && defined(NI_NUMERICHOST) |
| char name[200]; |
| if (noipv6) { |
| return strdup("unknown"); |
| } |
| if (getnameinfo(paddr, addrlen, name, sizeof(name), NULL, 0, NI_NUMERICHOST) == 0) { |
| return strdup(name); |
| } |
| #endif |
| return strdup("unknown"); |
| } |
| |
| int listen6(int port) { |
| #if X11VNC_IPV6 |
| struct sockaddr_in6 sin; |
| int fd = -1, one = 1; |
| |
| if (noipv6) { |
| return -1; |
| } |
| if (port <= 0 || 65535 < port) { |
| /* for us, invalid port means do not listen. */ |
| return -1; |
| } |
| |
| fd = socket(AF_INET6, SOCK_STREAM, 0); |
| if (fd < 0) { |
| rfbLogPerror("listen6: socket"); |
| rfbLog("(Ignore the above error if this system is IPv4-only.)\n"); |
| return -1; |
| } |
| |
| if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof(one)) < 0) { |
| rfbLogPerror("listen6: setsockopt SO_REUSEADDR"); |
| close(fd); |
| return -1; |
| } |
| |
| #if defined(SOL_IPV6) && defined(IPV6_V6ONLY) |
| if (setsockopt(fd, SOL_IPV6, IPV6_V6ONLY, (char *)&one, sizeof(one)) < 0) { |
| rfbLogPerror("listen6: setsockopt IPV6_V6ONLY"); |
| close(fd); |
| return -1; |
| } |
| #endif |
| |
| memset((char *)&sin, 0, sizeof(sin)); |
| sin.sin6_family = AF_INET6; |
| sin.sin6_port = htons(port); |
| sin.sin6_addr = in6addr_any; |
| |
| if (listen_str6) { |
| if (!strcmp(listen_str6, "localhost") || !strcmp(listen_str6, "::1")) { |
| sin.sin6_addr = in6addr_loopback; |
| } else { |
| int err; |
| struct addrinfo *ai; |
| struct addrinfo hints; |
| char service[32]; |
| |
| memset(&hints, 0, sizeof(hints)); |
| sprintf(service, "%d", port); |
| |
| hints.ai_family = AF_INET6; |
| hints.ai_socktype = SOCK_STREAM; |
| #ifdef AI_ADDRCONFIG |
| hints.ai_flags |= AI_ADDRCONFIG; |
| #endif |
| #ifdef AI_NUMERICHOST |
| if(ipv6_ip(listen_str6)) { |
| hints.ai_flags |= AI_NUMERICHOST; |
| } |
| #endif |
| #ifdef AI_NUMERICSERV |
| hints.ai_flags |= AI_NUMERICSERV; |
| #endif |
| err = getaddrinfo(listen_str6, service, &hints, &ai); |
| if (err == 0) { |
| struct addrinfo *ap = ai; |
| err = 1; |
| while (ap != NULL) { |
| char *s = ipv6_getipaddr(ap->ai_addr, ap->ai_addrlen); |
| if (!s) s = strdup("unknown"); |
| |
| rfbLog("listen6: checking: %s family: %d\n", s, ap->ai_family); |
| if (ap->ai_family == AF_INET6) { |
| memcpy((char *)&sin, ap->ai_addr, sizeof(sin)); |
| rfbLog("listen6: using: %s scope_id: %d\n", s, sin.sin6_scope_id); |
| err = 0; |
| free(s); |
| break; |
| } |
| free(s); |
| ap = ap->ai_next; |
| } |
| freeaddrinfo(ai); |
| } |
| |
| if (err != 0) { |
| rfbLog("Invalid or Unsupported -listen6 string: %s\n", listen_str6); |
| close(fd); |
| return -1; |
| } |
| } |
| } else if (allow_list && !strcmp(allow_list, "127.0.0.1")) { |
| sin.sin6_addr = in6addr_loopback; |
| } else if (listen_str) { |
| if (!strcmp(listen_str, "localhost")) { |
| sin.sin6_addr = in6addr_loopback; |
| } |
| } |
| |
| if (bind(fd, (struct sockaddr *) &sin, sizeof(sin)) < 0) { |
| rfbLogPerror("listen6: bind"); |
| close(fd); |
| return -1; |
| } |
| if (listen(fd, 32) < 0) { |
| rfbLogPerror("listen6: listen"); |
| close(fd); |
| return -1; |
| } |
| return fd; |
| #else |
| if (port) {} |
| return -1; |
| #endif |
| } |
| |
| #ifdef LIBVNCSERVER_HAVE_SYS_SOCKET_H |
| #include <sys/un.h> |
| #endif |
| |
| int listen_unix(char *file) { |
| #if !defined(AF_UNIX) || !defined(LIBVNCSERVER_HAVE_SYS_SOCKET_H) |
| if (sock) {} |
| return -1; |
| #else |
| int s, len; |
| struct sockaddr_un saun; |
| |
| s = socket(AF_UNIX, SOCK_STREAM, 0); |
| if (s < 0) { |
| rfbLogPerror("listen_unix: socket"); |
| return -1; |
| } |
| saun.sun_family = AF_UNIX; |
| strcpy(saun.sun_path, file); |
| unlink(file); |
| |
| len = sizeof(saun.sun_family) + strlen(saun.sun_path); |
| |
| if (bind(s, (struct sockaddr *)&saun, len) < 0) { |
| rfbLogPerror("listen_unix: bind"); |
| close(s); |
| return -1; |
| } |
| |
| if (listen(s, 32) < 0) { |
| rfbLogPerror("listen_unix: listen"); |
| close(s); |
| return -1; |
| } |
| rfbLog("listening on unix socket: %s fd=%d\n", file, s); |
| return s; |
| #endif |
| } |
| |
| int accept_unix(int s) { |
| #if !defined(AF_UNIX) || !defined(LIBVNCSERVER_HAVE_SYS_SOCKET_H) |
| if (s) {} |
| return -1; |
| #else |
| int fd, fromlen; |
| struct sockaddr_un fsaun; |
| |
| fd = accept(s, (struct sockaddr *)&fsaun, &fromlen); |
| if (fd < 0) { |
| rfbLogPerror("accept_unix: accept"); |
| return -1; |
| } |
| return fd; |
| #endif |
| } |
| |
| int connect_tcp(char *host, int port) { |
| double t0 = dnow(); |
| int fd = -1; |
| int fail4 = noipv4; |
| if (getenv("IPV4_FAILS")) { |
| fail4 = 2; |
| } |
| |
| rfbLog("connect_tcp: trying: %s %d\n", host, port); |
| |
| if (fail4) { |
| if (fail4 > 1) { |
| rfbLog("TESTING: IPV4_FAILS for connect_tcp.\n"); |
| } |
| } else { |
| fd = rfbConnectToTcpAddr(host, port); |
| } |
| |
| if (fd >= 0) { |
| return fd; |
| } |
| rfbLogPerror("connect_tcp: connection failed"); |
| |
| if (dnow() - t0 < 4.0) { |
| rfbLog("connect_tcp: re-trying %s %d\n", host, port); |
| usleep (100 * 1000); |
| if (!fail4) { |
| fd = rfbConnectToTcpAddr(host, port); |
| } |
| if (fd < 0) { |
| rfbLogPerror("connect_tcp: connection failed"); |
| } |
| } |
| |
| if (fd < 0 && !noipv6) { |
| #if X11VNC_IPV6 |
| int err; |
| struct addrinfo *ai; |
| struct addrinfo hints; |
| char service[32], *host2, *q; |
| |
| rfbLog("connect_tcp: trying IPv6 %s %d\n", host, port); |
| |
| memset(&hints, 0, sizeof(hints)); |
| sprintf(service, "%d", port); |
| |
| hints.ai_family = AF_UNSPEC; |
| hints.ai_socktype = SOCK_STREAM; |
| #ifdef AI_ADDRCONFIG |
| hints.ai_flags |= AI_ADDRCONFIG; |
| #endif |
| if(ipv6_ip(host)) { |
| #ifdef AI_NUMERICHOST |
| rfbLog("connect_tcp[ipv6]: setting AI_NUMERICHOST for %s\n", host); |
| hints.ai_flags |= AI_NUMERICHOST; |
| #endif |
| } |
| #ifdef AI_NUMERICSERV |
| hints.ai_flags |= AI_NUMERICSERV; |
| #endif |
| |
| if (!strcmp(host, "127.0.0.1")) { |
| host2 = strdup("::1"); |
| } else if (host[0] == '[') { |
| host2 = strdup(host+1); |
| } else { |
| host2 = strdup(host); |
| } |
| q = strrchr(host2, ']'); |
| if (q) { |
| *q = '\0'; |
| } |
| |
| err = getaddrinfo(host2, service, &hints, &ai); |
| if (err != 0) { |
| rfbLog("connect_tcp[ipv6]: getaddrinfo[%d]: %s\n", err, gai_strerror(err)); |
| usleep(100 * 1000); |
| err = getaddrinfo(host2, service, &hints, &ai); |
| } |
| free(host2); |
| |
| if (err != 0) { |
| rfbLog("connect_tcp[ipv6]: getaddrinfo[%d]: %s\n", err, gai_strerror(err)); |
| } else { |
| struct addrinfo *ap = ai; |
| while (ap != NULL) { |
| int sock; |
| |
| if (fail4) { |
| struct sockaddr_in6 *s6ptr; |
| if (ap->ai_family != AF_INET6) { |
| rfbLog("connect_tcp[ipv6]: skipping AF_INET address under -noipv4\n"); |
| ap = ap->ai_next; |
| continue; |
| } |
| #ifdef IN6_IS_ADDR_V4MAPPED |
| s6ptr = (struct sockaddr_in6 *) ap->ai_addr; |
| if (IN6_IS_ADDR_V4MAPPED(&(s6ptr->sin6_addr))) { |
| rfbLog("connect_tcp[ipv6]: skipping V4MAPPED address under -noipv4\n"); |
| ap = ap->ai_next; |
| continue; |
| } |
| #endif |
| } |
| |
| sock = socket(ap->ai_family, ap->ai_socktype, ap->ai_protocol); |
| |
| if (sock == -1) { |
| rfbLogPerror("connect_tcp[ipv6]: socket"); |
| if (0) rfbLog("(Ignore the above error if this system is IPv4-only.)\n"); |
| } else { |
| int res = -1, dmsg = 0; |
| char *s = ipv6_getipaddr(ap->ai_addr, ap->ai_addrlen); |
| if (!s) s = strdup("unknown"); |
| |
| rfbLog("connect_tcp[ipv6]: trying sock=%d fam=%d proto=%d using %s\n", |
| sock, ap->ai_family, ap->ai_protocol, s); |
| res = connect(sock, ap->ai_addr, ap->ai_addrlen); |
| #if defined(SOL_IPV6) && defined(IPV6_V6ONLY) |
| if (res != 0) { |
| int zero = 0; |
| rfbLogPerror("connect_tcp[ipv6]: connect"); |
| dmsg = 1; |
| if (setsockopt(sock, SOL_IPV6, IPV6_V6ONLY, (char *)&zero, sizeof(zero)) == 0) { |
| rfbLog("connect_tcp[ipv6]: trying again with IPV6_V6ONLY=0\n"); |
| res = connect(sock, ap->ai_addr, ap->ai_addrlen); |
| dmsg = 0; |
| } else { |
| rfbLogPerror("connect_tcp[ipv6]: setsockopt IPV6_V6ONLY"); |
| } |
| } |
| #endif |
| if (res == 0) { |
| rfbLog("connect_tcp[ipv6]: connect OK\n"); |
| fd = sock; |
| if (!ipv6_client_ip_str) { |
| ipv6_client_ip_str = strdup(s); |
| } |
| free(s); |
| break; |
| } else { |
| if (!dmsg) rfbLogPerror("connect_tcp[ipv6]: connect"); |
| close(sock); |
| } |
| free(s); |
| } |
| ap = ap->ai_next; |
| } |
| freeaddrinfo(ai); |
| } |
| #endif |
| } |
| if (fd < 0 && !fail4) { |
| /* this is a kludge for IPv4-only machines getting v4mapped string. */ |
| char *q, *host2; |
| if (host[0] == '[') { |
| host2 = strdup(host+1); |
| } else { |
| host2 = strdup(host); |
| } |
| q = strrchr(host2, ']'); |
| if (q) { |
| *q = '\0'; |
| } |
| if (strstr(host2, "::ffff:") == host2 || strstr(host2, "::FFFF:") == host2) { |
| char *host3 = host2 + strlen("::ffff:"); |
| if (dotted_ip(host3, 0)) { |
| rfbLog("connect_tcp[ipv4]: trying fallback to IPv4 for %s\n", host2); |
| fd = rfbConnectToTcpAddr(host3, port); |
| if (fd < 0) { |
| rfbLogPerror("connect_tcp[ipv4]: connection failed"); |
| } |
| } |
| } |
| free(host2); |
| } |
| return fd; |
| } |
| |
| int listen_tcp(int port, in_addr_t iface, int try6) { |
| int fd = -1; |
| int fail4 = noipv4; |
| if (getenv("IPV4_FAILS")) { |
| fail4 = 2; |
| } |
| |
| if (port <= 0 || 65535 < port) { |
| /* for us, invalid port means do not listen. */ |
| return -1; |
| } |
| |
| if (fail4) { |
| if (fail4 > 1) { |
| rfbLog("TESTING: IPV4_FAILS for listen_tcp: port=%d try6=%d\n", port, try6); |
| } |
| } else { |
| fd = rfbListenOnTCPPort(port, iface); |
| } |
| |
| if (fd >= 0) { |
| return fd; |
| } |
| if (fail4 > 1) { |
| rfbLogPerror("listen_tcp: listen failed"); |
| } |
| |
| if (fd < 0 && try6 && ipv6_listen && !noipv6) { |
| #if X11VNC_IPV6 |
| char *save = listen_str6; |
| if (iface == htonl(INADDR_LOOPBACK)) { |
| listen_str6 = "localhost"; |
| rfbLog("listen_tcp: retrying on IPv6 in6addr_loopback ...\n"); |
| fd = listen6(port); |
| } else if (iface == htonl(INADDR_ANY)) { |
| listen_str6 = NULL; |
| rfbLog("listen_tcp: retrying on IPv6 in6addr_any ...\n"); |
| fd = listen6(port); |
| } |
| listen_str6 = save; |
| #endif |
| } |
| return fd; |
| } |
| |