This is useful when a server is missing the necessary terminfo and
avoids having to manually set TERM before invoking ssh every time.
Signed-off-by: Omar Sandoval <osandov@xxxxxxxxxxx>
---
Changes from v1:
- Allow ``none'' to force using TERM from the environment
I'll elaborate on my use case. I use suckless's st terminal, so I install the
st terminfo on the machines I frequent. On other machines, though, I end up
having to set TERM to xterm manually on the command line, e.g.,
TERM=xterm-256color ssh foo
Instead, it'd be much more convenient to do the following:
Host machine_i_use_alot
Term none
Host *
Term xterm-256color
So ssh will default to using xterm-256color, but on hosts that I whitelist, it
will use TERM from the environment.
mux.c | 2 +-
readconf.c | 10 +++++++++-
readconf.h | 2 ++
ssh.c | 7 +++++--
ssh_config.5 | 10 ++++++++++
5 files changed, 27 insertions(+), 4 deletions(-)
diff --git a/mux.c b/mux.c
index cdc01bd4fff5..1aa21f8eee27 100644
--- a/mux.c
+++ b/mux.c
@@ -1814,7 +1814,7 @@ mux_client_request_session(int fd)
close(devnull);
}
- term = getenv("TERM");
+ term = options.term;
buffer_init(&m);
buffer_put_int(&m, MUX_C_NEW_SESSION);
diff --git a/readconf.c b/readconf.c
index 1d03bdf72d92..27169a8e9094 100644
--- a/readconf.c
+++ b/readconf.c
@@ -148,7 +148,7 @@ typedef enum {
oEnableSSHKeysign, oRekeyLimit, oVerifyHostKeyDNS, oConnectTimeout,
oAddressFamily, oGssAuthentication, oGssDelegateCreds,
oServerAliveInterval, oServerAliveCountMax, oIdentitiesOnly,
- oSendEnv, oControlPath, oControlMaster, oControlPersist,
+ oSendEnv, oTerm, oControlPath, oControlMaster, oControlPersist,
oHashKnownHosts,
oTunnel, oTunnelDevice, oLocalCommand, oPermitLocalCommand,
oVisualHostKey, oUseRoaming,
@@ -251,6 +251,7 @@ static struct {
{ "serveraliveinterval", oServerAliveInterval },
{ "serveralivecountmax", oServerAliveCountMax },
{ "sendenv", oSendEnv },
+ { "term", oTerm },
{ "controlpath", oControlPath },
{ "controlmaster", oControlMaster },
{ "controlpersist", oControlPersist },
@@ -1294,6 +1295,10 @@ parse_keytypes:
}
break;
+ case oTerm:
+ charptr = &options->term;
+ goto parse_string;
+
case oControlPath:
charptr = &options->control_path;
goto parse_string;
@@ -1650,6 +1655,7 @@ initialize_options(Options * options)
options->server_alive_interval = -1;
options->server_alive_count_max = -1;
options->num_send_env = 0;
+ options->term = NULL;
options->control_path = NULL;
options->control_master = -1;
options->control_persist = -1;
@@ -1879,6 +1885,7 @@ fill_default_options(Options * options)
/* options->hostname will be set in the main program if appropriate */
/* options->host_key_alias should not be set by default */
/* options->preferred_authentications will be set in ssh */
+ /* options->term will be set in ssh */
}
struct fwdarg {
@@ -2302,6 +2309,7 @@ dump_client_config(Options *o, const char *host)
/* String options */
dump_cfg_string(oBindAddress, o->bind_address);
dump_cfg_string(oCiphers, o->ciphers ? o->ciphers : KEX_CLIENT_ENCRYPT);
+ dump_cfg_string(oTerm, o->term);
dump_cfg_string(oControlPath, o->control_path);
dump_cfg_string(oHostKeyAlgorithms, o->hostkeyalgorithms ? o->hostkeyalgorithms : KEX_DEFAULT_PK_ALG);
dump_cfg_string(oHostKeyAlias, o->host_key_alias);
diff --git a/readconf.h b/readconf.h
index bb2d55283dd0..17e02f24ae4e 100644
--- a/readconf.h
+++ b/readconf.h
@@ -115,6 +115,8 @@ typedef struct {
int num_send_env;
char *send_env[MAX_SEND_ENV];
+ char *term;
+
char *control_path;
int control_master;
int control_persist; /* ControlPersist flag */
diff --git a/ssh.c b/ssh.c
index 59c1f931cb0a..db8bfd2d32eb 100644
--- a/ssh.c
+++ b/ssh.c
@@ -1117,6 +1117,9 @@ main(int ac, char **av)
if (options.user == NULL)
options.user = xstrdup(pw->pw_name);
+ if (option_clear_or_none(options.term))
+ options.term = getenv("TERM");
+
if (gethostname(thishost, sizeof(thishost)) == -1)
fatal("gethostname: %s", strerror(errno));
strlcpy(shorthost, thishost, sizeof(shorthost));
@@ -1638,7 +1641,7 @@ ssh_session(void)
/* Store TERM in the packet. There is no limit on the
length of the string. */
- cp = getenv("TERM");
+ cp = options.term;
if (!cp)
cp = "";
packet_put_cstring(cp);
@@ -1804,7 +1807,7 @@ ssh_session2_setup(int id, int success, void *arg)
packet_set_interactive(interactive,
options.ip_qos_interactive, options.ip_qos_bulk);
- client_session2_setup(id, tty_flag, subsystem_flag, getenv("TERM"),
+ client_session2_setup(id, tty_flag, subsystem_flag, options.term,
NULL, fileno(stdin), &command, environ);
}
diff --git a/ssh_config.5 b/ssh_config.5
index 5b0975f87e2f..b0441f1c4dda 100644
--- a/ssh_config.5
+++ b/ssh_config.5
@@ -1521,6 +1521,16 @@ This is important in scripts, and many users want it too.
.Pp
To disable TCP keepalive messages, the value should be set to
.Dq no .
+.It Cm Term
+Specifies the
+.Ev TERM
+environment variable which is sent to the server. This can be useful when the
+server does not have the proper terminfo installed. By default, or if set to
+.Dq none ,
+the server gets the
+.Ev TERM
+variable from the local
+.Xr environ 7 .
.It Cm Tunnel
Request
.Xr tun 4
--
2.5.0
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