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388 lines
7.4 KiB
388 lines
7.4 KiB
/* -- inet.c -- */
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#include "x11vnc.h"
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#include "unixpw.h"
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#include "sslhelper.h"
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/*
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* Simple utility to map host name to dotted IP address. Ignores aliases.
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* Up to caller to free returned string.
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*/
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char *host2ip(char *host);
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char *raw2host(char *raw, int len);
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char *raw2ip(char *raw);
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char *ip2host(char *ip);
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int dotted_ip(char *host);
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int get_remote_port(int sock);
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int get_local_port(int sock);
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char *get_remote_host(int sock);
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char *get_local_host(int sock);
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char *ident_username(rfbClientPtr client);
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int find_free_port(int start, int end);
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int have_ssh_env(void);
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static int get_port(int sock, int remote);
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static char *get_host(int sock, int remote);
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char *host2ip(char *host) {
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struct hostent *hp;
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struct sockaddr_in addr;
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char *str;
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if (! host_lookup) {
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return NULL;
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}
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hp = gethostbyname(host);
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if (!hp) {
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return NULL;
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}
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = *(unsigned long *)hp->h_addr;
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str = strdup(inet_ntoa(addr.sin_addr));
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return str;
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}
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char *raw2host(char *raw, int len) {
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char *str;
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#if LIBVNCSERVER_HAVE_NETDB_H && LIBVNCSERVER_HAVE_NETINET_IN_H
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struct hostent *hp;
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if (! host_lookup) {
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return strdup("unknown");
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}
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hp = gethostbyaddr(raw, len, AF_INET);
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if (!hp) {
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return strdup(inet_ntoa(*((struct in_addr *)raw)));
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}
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str = strdup(hp->h_name);
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#else
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str = strdup("unknown");
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#endif
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return str;
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}
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char *raw2ip(char *raw) {
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return strdup(inet_ntoa(*((struct in_addr *)raw)));
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}
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char *ip2host(char *ip) {
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char *str;
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#if LIBVNCSERVER_HAVE_NETDB_H && LIBVNCSERVER_HAVE_NETINET_IN_H
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struct hostent *hp;
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in_addr_t iaddr;
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if (! host_lookup) {
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return strdup("unknown");
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}
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iaddr = inet_addr(ip);
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if (iaddr == htonl(INADDR_NONE)) {
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return strdup("unknown");
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}
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hp = gethostbyaddr((char *)&iaddr, sizeof(in_addr_t), AF_INET);
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if (!hp) {
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return strdup("unknown");
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}
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str = strdup(hp->h_name);
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#else
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str = strdup("unknown");
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#endif
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return str;
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}
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int dotted_ip(char *host) {
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char *p = host;
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while (*p != '\0') {
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if (*p == '.' || isdigit((unsigned char) (*p))) {
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p++;
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continue;
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}
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return 0;
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}
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return 1;
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}
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static int get_port(int sock, int remote) {
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struct sockaddr_in saddr;
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unsigned int saddr_len;
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int saddr_port;
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saddr_len = sizeof(saddr);
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memset(&saddr, 0, sizeof(saddr));
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saddr_port = -1;
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if (remote) {
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if (!getpeername(sock, (struct sockaddr *)&saddr, &saddr_len)) {
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saddr_port = ntohs(saddr.sin_port);
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}
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} else {
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if (!getsockname(sock, (struct sockaddr *)&saddr, &saddr_len)) {
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saddr_port = ntohs(saddr.sin_port);
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}
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}
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return saddr_port;
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}
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int get_remote_port(int sock) {
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return get_port(sock, 1);
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}
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int get_local_port(int sock) {
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return get_port(sock, 0);
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}
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static char *get_host(int sock, int remote) {
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struct sockaddr_in saddr;
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unsigned int saddr_len;
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int saddr_port;
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char *saddr_ip_str = NULL;
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saddr_len = sizeof(saddr);
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memset(&saddr, 0, sizeof(saddr));
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saddr_port = -1;
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#if LIBVNCSERVER_HAVE_NETINET_IN_H
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if (remote) {
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if (!getpeername(sock, (struct sockaddr *)&saddr, &saddr_len)) {
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saddr_ip_str = inet_ntoa(saddr.sin_addr);
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}
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} else {
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if (!getsockname(sock, (struct sockaddr *)&saddr, &saddr_len)) {
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saddr_ip_str = inet_ntoa(saddr.sin_addr);
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}
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}
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#endif
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if (! saddr_ip_str) {
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saddr_ip_str = "unknown";
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}
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return strdup(saddr_ip_str);
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}
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char *get_remote_host(int sock) {
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return get_host(sock, 1);
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}
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char *get_local_host(int sock) {
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return get_host(sock, 0);
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}
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char *ident_username(rfbClientPtr client) {
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ClientData *cd = (ClientData *) client->clientData;
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char *str, *newhost, *user = NULL, *newuser = NULL;
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int len;
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if (cd) {
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user = cd->username;
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}
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if (!user || *user == '\0') {
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char msg[128];
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int n, sock, ok = 0;
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int block = 0;
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/*
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* need to check to see if the operation will block for
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* a long time: a firewall may just ignore our packets.
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*/
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#if LIBVNCSERVER_HAVE_FORK
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{ pid_t pid, pidw;
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int rc;
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if ((pid = fork()) > 0) {
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usleep(100 * 1000); /* 0.1 sec */
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pidw = waitpid(pid, &rc, WNOHANG);
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if (pidw <= 0) {
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usleep(1000 * 1000); /* 1.0 sec */
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pidw = waitpid(pid, &rc, WNOHANG);
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if (pidw <= 0) {
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block = 1;
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kill(pid, SIGTERM);
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}
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}
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} else if (pid == -1) {
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;
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} else {
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/* child */
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signal(SIGHUP, SIG_DFL);
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signal(SIGINT, SIG_DFL);
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signal(SIGQUIT, SIG_DFL);
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signal(SIGTERM, SIG_DFL);
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if ((sock = rfbConnectToTcpAddr(client->host, 113)) < 0) {
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exit(1);
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} else {
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close(sock);
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exit(0);
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}
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}
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}
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#endif
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if (block) {
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;
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} else if ((sock = rfbConnectToTcpAddr(client->host, 113)) < 0) {
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rfbLog("could not connect to ident: %s:%d\n",
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client->host, 113);
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} else {
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int ret;
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fd_set rfds;
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struct timeval tv;
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int rport = get_remote_port(client->sock);
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int lport = get_local_port(client->sock);
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sprintf(msg, "%d, %d\r\n", rport, lport);
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n = write(sock, msg, strlen(msg));
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FD_ZERO(&rfds);
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FD_SET(sock, &rfds);
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tv.tv_sec = 4;
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tv.tv_usec = 0;
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ret = select(sock+1, &rfds, NULL, NULL, &tv);
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if (ret > 0) {
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int i;
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char *q, *p;
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for (i=0; i<128; i++) {
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msg[i] = '\0';
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}
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usleep(250*1000);
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n = read(sock, msg, 127);
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close(sock);
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if (n <= 0) goto badreply;
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/* 32782 , 6000 : USERID : UNIX :runge */
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q = strstr(msg, "USERID");
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if (!q) goto badreply;
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q = strstr(q, ":");
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if (!q) goto badreply;
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q++;
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q = strstr(q, ":");
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if (!q) goto badreply;
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q++;
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q = lblanks(q);
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p = q;
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while (*p) {
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if (*p == '\r' || *p == '\n') {
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*p = '\0';
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}
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p++;
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}
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ok = 1;
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if (strlen(q) > 24) {
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*(q+24) = '\0';
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}
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newuser = strdup(q);
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badreply:
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n = 0; /* avoid syntax error */
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} else {
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close(sock);
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}
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}
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if (! ok || !newuser) {
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newuser = strdup("unknown-user");
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}
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if (cd) {
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if (cd->username) {
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free(cd->username);
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}
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cd->username = newuser;
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}
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user = newuser;
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}
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if (!strcmp(user, "unknown-user") && cd && cd->unixname[0] != '\0') {
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user = cd->unixname;
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}
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if (unixpw && openssl_last_ip && strstr("UNIX:", user) != user) {
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newhost = ip2host(openssl_last_ip);
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} else {
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newhost = ip2host(client->host);
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}
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len = strlen(user) + 1 + strlen(newhost) + 1;
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str = (char *) malloc(len);
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sprintf(str, "%s@%s", user, newhost);
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free(newhost);
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return str;
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}
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int find_free_port(int start, int end) {
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int port;
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if (start <= 0) {
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start = 1024;
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}
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if (end <= 0) {
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end = 65530;
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}
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for (port = start; port <= end; port++) {
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int sock = rfbListenOnTCPPort(port, htonl(INADDR_ANY));
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if (sock >= 0) {
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close(sock);
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return port;
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}
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}
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return 0;
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}
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int have_ssh_env(void) {
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char *str, *p = getenv("SSH_CONNECTION");
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char *rhost, *rport, *lhost, *lport;
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if (! p) {
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char *q = getenv("SSH_CLIENT");
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if (! q) {
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return 0;
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}
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if (strstr(q, "127.0.0.1") != NULL) {
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return 0;
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}
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return 1;
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}
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if (strstr(p, "127.0.0.1") != NULL) {
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return 0;
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}
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str = strdup(p);
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p = strtok(str, " ");
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rhost = p;
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p = strtok(NULL, " ");
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if (! p) goto fail;
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rport = p;
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p = strtok(NULL, " ");
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if (! p) goto fail;
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lhost = p;
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p = strtok(NULL, " ");
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if (! p) goto fail;
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lport = p;
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if (0) fprintf(stderr, "%d/%d - '%s' '%s'\n", atoi(rport), atoi(lport), rhost, lhost);
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if (atoi(rport) <= 16 || atoi(rport) > 65535) {
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goto fail;
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}
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if (atoi(lport) <= 16 || atoi(lport) > 65535) {
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goto fail;
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}
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if (!strcmp(rhost, lhost)) {
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goto fail;
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}
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free(str);
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return 1;
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fail:
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free(str);
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return 0;
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}
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