64 lines
1.8 KiB
Diff
64 lines
1.8 KiB
Diff
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--- netkit-telnet-0.17/telnetd/telnetd.8.nodns 2000-07-31 01:57:10.000000000 +0200
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+++ netkit-telnet-0.17/telnetd/telnetd.8 2007-04-13 10:58:27.000000000 +0200
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@@ -123,6 +123,8 @@
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.Xr login 1
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program.
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.El
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+.It Fl c
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+This option disables reverse dns checking. Of course that security is lower with this option
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.It Fl D Ar debugmode
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This option may be used for debugging purposes. This allows
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.Nm telnetd
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--- netkit-telnet-0.17/telnetd/telnetd.c.nodns 2007-04-13 10:49:57.000000000 +0200
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+++ netkit-telnet-0.17/telnetd/telnetd.c 2007-04-13 10:49:57.000000000 +0200
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@@ -83,6 +83,7 @@
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int debug = 0;
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int keepalive = 1;
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+int nodns = 0;
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char *loginprg = _PATH_LOGIN;
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char *progname;
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@@ -111,7 +112,7 @@
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progname = *argv;
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- while ((ch = getopt(argc, argv, "d:a:e:lhnr:I:D:B:sS:a:X:L:")) != EOF) {
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+ while ((ch = getopt(argc, argv, "cd:a:e:lhnr:I:D:B:sS:a:X:L:")) != EOF) {
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switch(ch) {
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#ifdef AUTHENTICATE
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@@ -147,7 +148,9 @@
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bftpd++;
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break;
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#endif /* BFTPDAEMON */
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-
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+ case 'c':
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+ nodns++;
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+ break;
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case 'd':
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if (strcmp(optarg, "ebug") == 0) {
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debug++;
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@@ -652,6 +655,9 @@
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char namebuf[255];
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error = getnameinfo(who, wholen, namebuf, sizeof(namebuf), NULL, 0, 0);
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+
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+ if ((error == EAI_AGAIN) && nodns)
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+ error = getnameinfo(who, wholen, namebuf, sizeof(namebuf), NULL, 0, NI_NUMERICHOST);
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if (error) {
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perror("getnameinfo: localhost");
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@@ -688,7 +694,10 @@
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hints.ai_socktype = SOCK_STREAM;
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hints.ai_flags = AI_ADDRCONFIG;
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- gethostname(host_name, sizeof(host_name));
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+ if(nodns)
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+ sprintf(host_name, "localhost", sizeof(host_name));
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+ else
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+ gethostname(host_name, sizeof(host_name));
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if ((e = getaddrinfo(host_name, NULL, &hints, &res)) != 0) {
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perror("getaddrinfo: localhost");
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perror(gai_strerror(e));
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