mirror of
https://github.com/sheumann/telnetd.git
synced 2024-11-25 20:32:19 +00:00
Add more dual stack consideration.
-Should retry as much as possible when some of source
routing intermediate hosts' address families missmatch
happened.
(such as when a host has only A record, and another host
has each of A and AAAA record.)
-Should retry as much as possible when dest addr and
source addr(specified with -s option) address family
missmatch happend
Approved by: jkh
git-svn-id: http://svn0.us-east.freebsd.org/base/head/contrib/telnet@57125 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
This commit is contained in:
shin
parent
92a0e6dadf
commit
d2ec198a69
@ -108,6 +108,7 @@ extern int Ambiguous();
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static int help(int argc, char *argv[]);
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static int call();
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static void cmdrc(char *m1, char *m2);
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static int switch_af(struct addrinfo **aip);
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int quit(void);
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@ -2324,6 +2325,32 @@ setpolicy(net, res, policy)
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free(buf);
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}
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#endif
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#ifdef INET6
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/*
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* When an Address Family related error happend, check if retry with
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* another AF is possible or not.
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* Return 1, if retry with another af is OK. Else, return 0.
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*/
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static int
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switch_af(aip)
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struct addrinfo **aip;
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{
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int nextaf;
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struct addrinfo *ai;
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ai = *aip;
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nextaf = (ai->ai_family == AF_INET) ? AF_INET6 : AF_INET;
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do
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ai=ai->ai_next;
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while (ai != NULL && ai->ai_family != nextaf);
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*aip = ai;
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if (*aip != NULL) {
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return 1;
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}
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return 0;
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}
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#endif
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int
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@ -2331,18 +2358,14 @@ tn(argc, argv)
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int argc;
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char *argv[];
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{
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struct sockaddr_storage ss, src_ss;
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char *srp = 0, *strrchr();
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int proto, opt;
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int sourceroute(), srlen;
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int srcroute = 0, result;
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char *cmd, *hostp = 0, *portp = 0, *user = 0;
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char *src_addr = NULL;
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struct addrinfo hints, *res;
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int error = 0;
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/* clear the socket address prior to use */
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memset((char *)&ss, 0, sizeof(ss));
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struct addrinfo hints, *res, *res0 = NULL, *src_res, *src_res0 = NULL;
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int error = 0, af_error = 0;
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if (connected) {
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printf("?Already connected to %s\n", hostname);
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@ -2406,19 +2429,19 @@ tn(argc, argv)
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hints.ai_flags = AI_NUMERICHOST;
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hints.ai_family = family;
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hints.ai_socktype = SOCK_STREAM;
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error = getaddrinfo(src_addr, 0, &hints, &res);
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error = getaddrinfo(src_addr, 0, &hints, &src_res);
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if (error == EAI_NONAME) {
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hints.ai_flags = 0;
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error = getaddrinfo(src_addr, 0, &hints, &res);
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error = getaddrinfo(src_addr, 0, &hints, &src_res);
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}
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if (error != 0) {
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fprintf(stderr, "%s: %s\n", src_addr, gai_strerror(error));
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if (error == EAI_SYSTEM)
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fprintf(stderr, "%s: %s\n", src_addr, strerror(errno));
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setuid(getuid());
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return 0;
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}
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memcpy((void *)&src_ss, (void *)res->ai_addr, res->ai_addrlen);
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freeaddrinfo(res);
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src_res0 = src_res;
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}
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if (hostp[0] == '@' || hostp[0] == '!') {
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if (
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@ -2464,9 +2487,8 @@ tn(argc, argv)
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if (error == EAI_SYSTEM)
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fprintf(stderr, "%s: %s\n", hostname, strerror(errno));
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setuid(getuid());
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return 0;
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goto fail;
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}
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memcpy((void *)&ss, (void *)res->ai_addr, res->ai_addrlen);
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if (srcroute != 0)
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(void) strncpy(_hostname, hostname, sizeof(_hostname) - 1);
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else if (res->ai_canonname != NULL)
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@ -2480,20 +2502,33 @@ tn(argc, argv)
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if (error == EAI_SYSTEM)
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fprintf(stderr, "%s: %s\n", hostname, strerror(errno));
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setuid(getuid());
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return 0;
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goto fail;
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}
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res0 = res;
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if (srcroute != 0) {
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char hostbuf[BUFSIZ];
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strncpy(hostbuf, hostp, BUFSIZ - 1);
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hostbuf[BUFSIZ - 1] = '\0';
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af_again:
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if (af_error != 0)
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hostp = hostbuf;
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srp = 0;
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result = sourceroute(res, hostp, &srp, &srlen, &proto, &opt);
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if (result == 0) {
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#ifdef INET6
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if (family == AF_UNSPEC && af_error == 0 &&
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switch_af(&res) == 1) {
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af_error = 1;
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goto af_again;
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}
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#endif
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setuid(getuid());
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freeaddrinfo(res);
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return 0;
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goto fail;
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} else if (result == -1) {
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printf("Bad source route option: %s\n", hostp);
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setuid(getuid());
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freeaddrinfo(res);
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return 0;
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goto fail;
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}
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}
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printf("Trying %s...\n", sockaddr_ntop(res->ai_addr));
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@ -2501,8 +2536,15 @@ tn(argc, argv)
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net = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
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setuid(getuid());
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if (net < 0) {
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#ifdef INET6
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if (family == AF_UNSPEC && af_error == 0 &&
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switch_af(&res) == 1) {
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af_error = 1;
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goto af_again;
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}
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#endif
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perror("telnet: socket");
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return 0;
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goto fail;
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}
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if (srp && setsockopt(net, proto, opt, (char *)srp, srlen) < 0)
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perror("setsockopt (source route)");
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@ -2528,40 +2570,60 @@ tn(argc, argv)
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}
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if (src_addr != NULL) {
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if (bind(net, (struct sockaddr *)&src_ss,
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((struct sockaddr *)&src_ss)->sa_len) == -1) {
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for (src_res = src_res0; src_res != 0; src_res = src_res->ai_next)
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if (src_res->ai_family != res->ai_family)
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continue;
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if (src_res == NULL)
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src_res = src_res0;
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if (bind(net, src_res->ai_addr, src_res->ai_addrlen) == -1) {
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#ifdef INET6
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if (family == AF_UNSPEC && af_error == 0 &&
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switch_af(&res) == 1) {
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af_error = 1;
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goto af_again;
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}
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#endif
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perror("bind");
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return 0;
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goto fail;
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}
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}
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#if defined(IPSEC) && defined(IPSEC_POLICY_IPSEC)
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if (setpolicy(net, res, ipsec_policy_in) < 0)
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return 0;
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goto fail;
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if (setpolicy(net, res, ipsec_policy_out) < 0)
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return 0;
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goto fail;
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#endif
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if (connect(net, res->ai_addr, res->ai_addrlen) < 0) {
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if (res->ai_next) {
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struct addrinfo *next;
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next = res->ai_next;
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/* If already an af failed, only try same af. */
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if (af_error != 0)
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while (next != NULL && next->ai_family != res->ai_family)
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next = next->ai_next;
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if (next != NULL) {
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int oerrno = errno;
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fprintf(stderr, "telnet: connect to address %s: ",
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sockaddr_ntop(res->ai_addr));
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errno = oerrno;
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perror((char *)0);
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res = res->ai_next;
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res = next;
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(void) NetClose(net);
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continue;
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}
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perror("telnet: Unable to connect to remote host");
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return 0;
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goto fail;
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}
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connected++;
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#if defined(AUTHENTICATION) || defined(ENCRYPTION)
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auth_encrypt_connect(connected);
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#endif /* defined(AUTHENTICATION) || defined(ENCRYPTION) */
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} while (connected == 0);
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freeaddrinfo(res);
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freeaddrinfo(res0);
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if (src_res0 != NULL)
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freeaddrinfo(src_res0);
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cmdrc(hostp, hostname);
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if (autologin && user == NULL) {
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struct passwd *pw;
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@ -2585,6 +2647,12 @@ tn(argc, argv)
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(void) NetClose(net);
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ExitString("Connection closed by foreign host.\n",1);
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/*NOTREACHED*/
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fail:
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if (res0 != NULL)
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freeaddrinfo(res0);
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if (src_res0 != NULL)
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freeaddrinfo(src_res0);
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return 0;
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}
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#define HELPINDENT (sizeof ("connect"))
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