Add "-s src_addr" option to allow setting of the source IP address.
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5c539f036d
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svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=47947
@ -2100,7 +2100,7 @@ tn(argc, argv)
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char *argv[];
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{
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register struct hostent *host = 0;
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struct sockaddr_in sin;
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struct sockaddr_in sin, src_sin;
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struct servent *sp = 0;
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unsigned long temp;
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#if defined(IP_OPTIONS) && defined(IPPROTO_IP)
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@ -2108,6 +2108,7 @@ tn(argc, argv)
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unsigned long sourceroute(), srlen;
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#endif
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char *cmd, *hostp = 0, *portp = 0, *user = 0;
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char *src_addr = NULL;
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/* clear the socket address prior to use */
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bzero((char *)&sin, sizeof(sin));
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@ -2143,6 +2144,14 @@ tn(argc, argv)
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autologin = 1;
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continue;
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}
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if (strcmp(*argv, "-s") == 0) {
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--argc; ++argv;
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if (argc == 0)
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goto usage;
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src_addr = *argv++;
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--argc;
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continue;
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}
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if (hostp == 0) {
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hostp = *argv++;
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--argc;
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@ -2154,13 +2163,31 @@ tn(argc, argv)
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continue;
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}
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usage:
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printf("usage: telnet [-l user] [-a] host-name [port]\n");
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printf("usage: telnet [-l user] [-a] [-s src_addr] host-name [port]\n");
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setuid(getuid());
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return 0;
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}
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if (hostp == 0)
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goto usage;
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if (src_addr != NULL) {
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bzero((char *)&src_sin, sizeof(src_sin));
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src_sin.sin_family = AF_INET;
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if (!inet_aton(src_addr, &src_sin.sin_addr)) {
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host = gethostbyname2(src_addr, AF_INET);
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if (host == NULL) {
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herror(src_addr);
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return 0;
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}
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if (host->h_length != sizeof(src_sin.sin_addr)) {
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fprintf(stderr, "telnet: gethostbyname2: invalid address\n");
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return 0;
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}
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memcpy((void *)&src_sin.sin_addr, (void *)host->h_addr_list[0],
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sizeof(src_sin.sin_addr));
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}
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}
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#if defined(IP_OPTIONS) && defined(IPPROTO_IP)
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if (hostp[0] == '@' || hostp[0] == '!') {
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if ((hostname = strrchr(hostp, ':')) == NULL)
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@ -2285,6 +2312,13 @@ tn(argc, argv)
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perror("setsockopt (SO_DEBUG)");
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}
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if (src_addr != NULL) {
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if (bind(net, (struct sockaddr *)&src_sin, sizeof(src_sin)) == -1) {
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perror("bind");
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return 0;
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}
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}
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if (connect(net, (struct sockaddr *)&sin, sizeof (sin)) < 0) {
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#if defined(h_addr) /* In 4.3, this is a #define */
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if (host && host->h_addr_list[1]) {
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@ -85,16 +85,18 @@ usage()
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"\n\t[-k realm] [-l user] [-f/-F] [-n tracefile] ",
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#else
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"[-8] [-E] [-L] [-S tos] [-a] [-c] [-d] [-e char] [-l user]",
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"\n\t[-n tracefile]",
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"\n\t[-n tracefile] ",
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#endif
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#if defined(TN3270) && defined(unix)
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# ifdef AUTHENTICATION
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"[-noasynch] [-noasynctty]\n\t[-noasyncnet] [-r] [-t transcom] ",
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"[-noasynch] [-noasynctty]\n\t"
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"[-noasyncnet] [-r] [-s src_addr] [-t transcom] ",
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# else
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"[-noasynch] [-noasynctty] [-noasyncnet] [-r]\n\t[-t transcom]",
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"[-noasynch] [-noasynctty] [-noasyncnet] [-r]\n\t"
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"[-s src_addr] [-t transcom]",
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# endif
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#else
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"[-r] ",
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"[-r] [-s src_addr] ",
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#endif
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"[host-name [port]]"
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);
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@ -114,6 +116,7 @@ main(argc, argv)
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extern int optind;
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int ch;
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char *user, *strrchr();
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char *src_addr = NULL;
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#ifdef FORWARD
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extern int forward_flags;
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#endif /* FORWARD */
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@ -135,7 +138,7 @@ main(argc, argv)
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rlogin = (strncmp(prompt, "rlog", 4) == 0) ? '~' : _POSIX_VDISABLE;
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autologin = -1;
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while ((ch = getopt(argc, argv, "8EKLNS:X:acde:fFk:l:n:rt:x")) != -1) {
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while ((ch = getopt(argc, argv, "8EKLNS:X:acde:fFk:l:n:rs:t:x")) != -1) {
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switch(ch) {
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case '8':
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eight = 3; /* binary output and input */
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@ -255,6 +258,9 @@ main(argc, argv)
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case 'r':
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rlogin = '~';
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break;
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case 's':
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src_addr = optarg;
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break;
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case 't':
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#if defined(TN3270) && defined(unix)
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transcom = tline;
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@ -283,7 +289,7 @@ main(argc, argv)
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argv += optind;
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if (argc) {
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char *args[7], **argp = args;
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char *args[9], **argp = args;
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if (argc > 2)
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usage();
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@ -292,6 +298,10 @@ main(argc, argv)
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*argp++ = "-l";
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*argp++ = user;
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}
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if (src_addr) {
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*argp++ = "-s";
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*argp++ = src_addr;
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}
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*argp++ = argv[0]; /* host */
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if (argc > 1)
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*argp++ = argv[1]; /* port */
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@ -30,7 +30,7 @@
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)telnet.1 8.5 (Berkeley) 3/1/94
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.\" $Id: telnet.1,v 1.9 1997/12/27 18:58:27 steve Exp $
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.\" $Id: telnet.1,v 1.10 1998/12/14 22:40:38 billf Exp $
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.\"
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.Dd March 1, 1994
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.Dt TELNET 1
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@ -49,6 +49,7 @@ protocol
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.Op Fl k Ar realm
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.Op Fl l Ar user
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.Op Fl n Ar tracefile
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.Op Fl s Ar src_addr
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.Oo
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.Ar host
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.Op Ar port
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@ -184,6 +185,12 @@ mode, the escape character is set to the tilde (~) character,
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unless modified by the
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.Fl e
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option.
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.It Fl s Ar src_addr
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Set the source IP address for the
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.Nm
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connection to
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.Ar src_addr ,
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which can be an IP address or a host name.
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.It Fl x
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Turns on encryption of the data stream if possible. This
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option is not available outside of the United States and
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