[Reposted from tech@xxxxxxxxxxx] Is there a reason ssh doesn't consult services(5) for port numbers? This has irked me forever. I'd rather write ssh -L icb:localhost:icb instead of ssh -L 7326, wait, 7236, uhm, grep icb /etc/services... I don't think there is any syntactic ambiguity since Unix sockets already must contain a '/'. The patch below adds this: * Try to resolve a port specification with getservbyname(3) if a numeric conversion fails. * Make the "Port" option in ssh_config handle its argument as a port rather than a plain integer. All other command line switches and configuration file options already use a2port(). This passes the existing regression tests. Index: misc.c =================================================================== RCS file: /cvs/src/usr.bin/ssh/misc.c,v retrieving revision 1.131 diff -u -p -r1.131 misc.c --- misc.c 27 Jul 2018 05:13:02 -0000 1.131 +++ misc.c 30 Aug 2018 23:59:07 -0000 @@ -36,6 +36,7 @@ #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/tcp.h> +#include <arpa/inet.h> #include <ctype.h> #include <errno.h> @@ -299,13 +300,16 @@ pwcopy(struct passwd *pw) int a2port(const char *s) { + struct servent *se; long long port; const char *errstr; port = strtonum(s, 0, 65535, &errstr); - if (errstr != NULL) - return -1; - return (int)port; + if (errstr == NULL) + return (int)port; + if ((se = getservbyname(s, "tcp")) != NULL) + return ntohs(se->s_port); + return -1; } int Index: readconf.c =================================================================== RCS file: /cvs/src/usr.bin/ssh/readconf.c,v retrieving revision 1.297 diff -u -p -r1.297 readconf.c --- readconf.c 12 Aug 2018 20:19:13 -0000 1.297 +++ readconf.c 30 Aug 2018 23:14:38 -0000 @@ -1142,7 +1142,20 @@ parse_command: return 0; case oPort: - intptr = &options->port; + arg = strdelim(&s); + if (!arg || *arg == '\0') + fatal("%.200s line %d: Missing argument.", + filename, linenum); + value = a2port(arg); + if (value <= 0) + fatal("%.200s line %d: Bad port '%s'.", + filename, linenum, arg); + if (*activep && options->port == -1) + options->port = value; + break; + + case oConnectionAttempts: + intptr = &options->connection_attempts; parse_int: arg = strdelim(&s); if ((errstr = atoi_err(arg, &value)) != NULL) @@ -1151,10 +1164,6 @@ parse_int: if (*activep && *intptr == -1) *intptr = value; break; - - case oConnectionAttempts: - intptr = &options->connection_attempts; - goto parse_int; case oCiphers: arg = strdelim(&s); -- Christian "naddy" Weisgerber naddy@xxxxxxxxxxxx _______________________________________________ openssh-unix-dev mailing list openssh-unix-dev@xxxxxxxxxxx https://lists.mindrot.org/mailman/listinfo/openssh-unix-dev