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Prompt for a remote username in rlogin connections, if one wasn't

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specified in the configuration. Jacob's userpass abstraction proves
its worth in making this a trivial job.

(Actually reported by a user - somebody's still using rlogin!)

[originally from svn r9096]
This commit is contained in:
Simon Tatham 2011-02-18 19:12:20 +00:00
parent fa85085640
commit b22bdb2b0d
1 changed files with 68 additions and 25 deletions
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93
rlogin.c
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@ -27,6 +27,11 @@ typedef struct rlogin_tag {
int cansize;
int term_width, term_height;
void *frontend;
Config cfg;
/* In case we need to read a username from the terminal before starting */
prompts_t *prompt;
} *Rlogin;
static void rlogin_size(void *handle, int width, int height);
@ -113,6 +118,27 @@ static void rlogin_sent(Plug plug, int bufsize)
rlogin->bufsize = bufsize;
}
static void rlogin_startup(Rlogin rlogin, const char *ruser)
{
char z = 0;
char *p;
sk_write(rlogin->s, &z, 1);
sk_write(rlogin->s, rlogin->cfg.localusername,
strlen(rlogin->cfg.localusername));
sk_write(rlogin->s, &z, 1);
sk_write(rlogin->s, ruser,
strlen(ruser));
sk_write(rlogin->s, &z, 1);
sk_write(rlogin->s, rlogin->cfg.termtype,
strlen(rlogin->cfg.termtype));
sk_write(rlogin->s, "/", 1);
for (p = rlogin->cfg.termspeed; isdigit((unsigned char)*p); p++) continue;
sk_write(rlogin->s, rlogin->cfg.termspeed, p - rlogin->cfg.termspeed);
rlogin->bufsize = sk_write(rlogin->s, &z, 1);
rlogin->prompt = NULL;
}
/*
* Called to set up the rlogin connection.
*
@ -135,6 +161,7 @@ static const char *rlogin_init(void *frontend_handle, void **backend_handle,
SockAddr addr;
const char *err;
Rlogin rlogin;
char ruser[sizeof(cfg->username)];
rlogin = snew(struct rlogin_tag);
rlogin->fn = &fn_table;
@ -144,6 +171,8 @@ static const char *rlogin_init(void *frontend_handle, void **backend_handle,
rlogin->term_height = cfg->height;
rlogin->firstbyte = 1;
rlogin->cansize = 0;
rlogin->prompt = NULL;
rlogin->cfg = *cfg; /* STRUCTURE COPY */
*backend_handle = rlogin;
/*
@ -175,30 +204,6 @@ static const char *rlogin_init(void *frontend_handle, void **backend_handle,
if ((err = sk_socket_error(rlogin->s)) != NULL)
return err;
/*
* Send local username, remote username, terminal/speed
*/
{
char z = 0;
char *p;
char ruser[sizeof(cfg->username)];
(void) get_remote_username(cfg, ruser, sizeof(ruser));
sk_write(rlogin->s, &z, 1);
sk_write(rlogin->s, cfg->localusername,
strlen(cfg->localusername));
sk_write(rlogin->s, &z, 1);
sk_write(rlogin->s, ruser,
strlen(ruser));
sk_write(rlogin->s, &z, 1);
sk_write(rlogin->s, cfg->termtype,
strlen(cfg->termtype));
sk_write(rlogin->s, "/", 1);
for (p = cfg->termspeed; isdigit((unsigned char)*p); p++) continue;
sk_write(rlogin->s, cfg->termspeed, p - cfg->termspeed);
rlogin->bufsize = sk_write(rlogin->s, &z, 1);
}
if (*cfg->loghost) {
char *colon;
@ -215,6 +220,28 @@ static const char *rlogin_init(void *frontend_handle, void **backend_handle,
}
}
/*
* Send local username, remote username, terminal type and
* terminal speed - unless we don't have the remote username yet,
* in which case we prompt for it and may end up deferring doing
* anything else until the local prompt mechanism returns.
*/
if (get_remote_username(cfg, ruser, sizeof(ruser))) {
rlogin_startup(rlogin, ruser);
} else {
int ret;
rlogin->prompt = new_prompts(rlogin->frontend);
rlogin->prompt->to_server = TRUE;
rlogin->prompt->name = dupstr("Rlogin login name");
add_prompt(rlogin->prompt, dupstr("rlogin username: "), TRUE,
sizeof(cfg->username));
ret = get_userpass_input(rlogin->prompt, NULL, 0);
if (ret >= 0) {
rlogin_startup(rlogin, rlogin->prompt->prompts[0]->result);
}
}
return NULL;
}
@ -222,6 +249,8 @@ static void rlogin_free(void *handle)
{
Rlogin rlogin = (Rlogin) handle;
if (rlogin->prompt)
free_prompts(rlogin->prompt);
if (rlogin->s)
sk_close(rlogin->s);
sfree(rlogin);
@ -244,7 +273,21 @@ static int rlogin_send(void *handle, char *buf, int len)
if (rlogin->s == NULL)
return 0;
rlogin->bufsize = sk_write(rlogin->s, buf, len);
if (rlogin->prompt) {
/*
* We're still prompting for a username, and aren't talking
* directly to the network connection yet.
*/
int ret = get_userpass_input(rlogin->prompt,
(unsigned char *)buf, len);
if (ret >= 0) {
rlogin_startup(rlogin, rlogin->prompt->prompts[0]->result);
/* that nulls out rlogin->prompt, so then we'll start sending
* data down the wire in the obvious way */
}
} else {
rlogin->bufsize = sk_write(rlogin->s, buf, len);
}
return rlogin->bufsize;
}