Public bug reported:
1) Ubuntu release
Description: Ubuntu 18.04.3 LTS
Release: 18.04
2) Package version
telnet:
Installed: 0.17-41
Candidate: 0.17-41
Version table:
*** 0.17-41 500
500 http://kr.archive.ubuntu.com/ubuntu bionic/main amd64 Packages
100 /var/lib/dpkg/status
3) What expected to happen
- 1. Specify a port in telnetrc ( $HOME/.telnetrc) as follows
* DEFAUT:8023 mode character
- 2. telnet a host with specific port
* telnet 192.168.1.1 8023
- The expected is that "mode character" command is executed as soon as server
is connected, according to "man telnet"
4) What happened instead
- The command in telnetrc specifying a port is not executed
- But If not specifying a port, the command is executed as expected
5) Cause of Bug
- telnetrc parsing routine ( readrc() function in telnet/command.cc ) has a
flaw in comparing the port number of command-line with that of telnetrc
- To proceed command processing, the result of string compare MUST not negated
- The patch is as follows
--- a/telnet/commands.cc
+++ b/telnet/commands.cc
@@ -2135,7 +2135,7 @@ static void readrc(const char *m1, const char *m2, const
char *port,
continue;
while (fgets(line, sizeof(line), rcfile)) {
...
if (gotmachine == 0) {
...
if (line[0] == ':') {
- if (!strncasecmp(&line[1], port, lport))
+ if (strncasecmp(&line[1], port, lport))
continue;
strncpy(line, &line[lport + 1], sizeof(line) - lport - 1);
}
...
}
...
process_command(&cmdtab, margc, margv);
** Affects: netkit-telnet (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "Bug in comparing port strings in readrc() is fixed"
https://bugs.launchpad.net/bugs/1891021/+attachment/5400372/+files/patch-port_in_telnetrc.txt
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https://bugs.launchpad.net/bugs/1891021
Title:
Specifying a port in telnetrc is not working
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