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Separate out the code for creating and sending SSH version strings so that in

Browse Source 
the SSH-2-only case, we can send it as soon as we connect rather than waiting
for the server's one.  Unfortunately, actually doing so will take a little
more effort -- there are subtleties to do with having a working log context
at the right moment that need to be sorted out.

[originally from svn r7645]
This commit is contained in:
Ben Harris 2007-07-19 23:53:02 +00:00
parent 3ac841ff6f
commit 22cde3ee5b
1 changed files with 90 additions and 57 deletions
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147
ssh.c
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@ -2377,6 +2377,47 @@ static void ssh_fix_verstring(char *str)
}
}
/*
* Send an appropriate SSH version string.
*/
static void ssh_send_verstring(Ssh ssh, char *svers)
{
char *verstring;
if (ssh->version == 2) {
/*
* Construct a v2 version string.
*/
verstring = dupprintf("SSH-2.0-%s\015\012", sshver);
} else {
/*
* Construct a v1 version string.
*/
verstring = dupprintf("SSH-%s-%s\012",
(ssh_versioncmp(svers, "1.5") <= 0 ?
svers : "1.5"),
sshver);
}
ssh_fix_verstring(verstring);
if (ssh->version == 2) {
size_t len;
/*
* Record our version string.
*/
len = strcspn(verstring, "\015\012");
ssh->v_c = snewn(len + 1, char);
memcpy(ssh->v_c, verstring, len);
ssh->v_c[len] = 0;
}
logeventf(ssh, "We claim version: %.*s",
strcspn(verstring, "\015\012"), verstring);
s_write(ssh, verstring, strlen(verstring));
sfree(verstring);
}
static int do_ssh_init(Ssh ssh, unsigned char c)
{
struct do_ssh_init_state {
@ -2391,6 +2432,20 @@ static int do_ssh_init(Ssh ssh, unsigned char c)
crBegin(ssh->do_ssh_init_crstate);
/*
* If the SSH version number's fixed, set it now, and if it's SSH-2,
* send the version string too.
*
* XXX This isn't actually early enough to be useful, since we only
* get here when the first incoming byte turns up.
*/
if (ssh->cfg.sshprot == 0)
ssh->version = 1;
if (ssh->cfg.sshprot == 3) {
ssh->version = 2;
ssh_send_verstring(ssh, NULL);
}
/* Search for a line beginning with the string "SSH-" in the input. */
for (;;) {
if (c != 'S') goto no;
@ -2455,66 +2510,44 @@ static int do_ssh_init(Ssh ssh, unsigned char c)
crStop(0);
}
{
char *verstring;
if (s->proto2 && (ssh->cfg.sshprot >= 2 || !s->proto1)) {
/*
* Construct a v2 version string.
*/
verstring = dupprintf("SSH-2.0-%s\015\012", sshver);
ssh->version = 2;
} else {
/*
* Construct a v1 version string.
*/
verstring = dupprintf("SSH-%s-%s\012",
(ssh_versioncmp(s->version, "1.5") <= 0 ?
s->version : "1.5"),
sshver);
ssh->version = 1;
}
ssh_fix_verstring(verstring);
if (ssh->version == 2) {
size_t len;
/*
* Record our version string and their version string.
*/
len = strcspn(verstring, "\015\012");
ssh->v_c = snewn(len + 1, char);
memcpy(ssh->v_c, verstring, len);
ssh->v_c[len] = 0;
len = strcspn(s->vstring, "\015\012");
ssh->v_s = snewn(len + 1, char);
memcpy(ssh->v_s, s->vstring, len);
ssh->v_s[len] = 0;
/*
* Initialise SSH-2 protocol.
*/
ssh->protocol = ssh2_protocol;
ssh2_protocol_setup(ssh);
ssh->s_rdpkt = ssh2_rdpkt;
} else {
/*
* Initialise SSH-1 protocol.
*/
ssh->protocol = ssh1_protocol;
ssh1_protocol_setup(ssh);
ssh->s_rdpkt = ssh1_rdpkt;
}
logeventf(ssh, "We claim version: %.*s",
strcspn(verstring, "\015\012"), verstring);
s_write(ssh, verstring, strlen(verstring));
sfree(verstring);
if (ssh->version == 2)
do_ssh2_transport(ssh, NULL, -1, NULL);
}
if (s->proto2 && (ssh->cfg.sshprot >= 2 || !s->proto1))
ssh->version = 2;
else
ssh->version = 1;
logeventf(ssh, "Using SSH protocol version %d", ssh->version);
/* Send the version string, if we haven't already */
if (ssh->cfg.sshprot != 3)
ssh_send_verstring(ssh, s->version);
if (ssh->version == 2) {
size_t len;
/*
* Record their version string.
*/
len = strcspn(s->vstring, "\015\012");
ssh->v_s = snewn(len + 1, char);
memcpy(ssh->v_s, s->vstring, len);
ssh->v_s[len] = 0;
/*
* Initialise SSH-2 protocol.
*/
ssh->protocol = ssh2_protocol;
ssh2_protocol_setup(ssh);
ssh->s_rdpkt = ssh2_rdpkt;
} else {
/*
* Initialise SSH-1 protocol.
*/
ssh->protocol = ssh1_protocol;
ssh1_protocol_setup(ssh);
ssh->s_rdpkt = ssh1_rdpkt;
}
if (ssh->version == 2)
do_ssh2_transport(ssh, NULL, -1, NULL);
update_specials_menu(ssh->frontend);
ssh->state = SSH_STATE_BEFORE_SIZE;
ssh->pinger = pinger_new(&ssh->cfg, &ssh_backend, ssh);