X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/c85623f918b8a6c639afc15604414f9b113bb20d..HEAD:/rlogin.c diff --git a/rlogin.c b/rlogin.c index ff2af317..f582f0c0 100644 --- a/rlogin.c +++ b/rlogin.c @@ -1,5 +1,10 @@ +/* + * Rlogin backend. + */ + #include #include +#include #include #include "putty.h" @@ -18,10 +23,17 @@ typedef struct rlogin_tag { /* the above field _must_ be first in the structure */ Socket s; + int closed_on_socket_error; int bufsize; int firstbyte; + int cansize; int term_width, term_height; void *frontend; + + Conf *conf; + + /* 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); @@ -32,18 +44,45 @@ static void c_write(Rlogin rlogin, char *buf, int len) sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG); } -static int rlogin_closing(Plug plug, char *error_msg, int error_code, +static void rlogin_log(Plug plug, int type, SockAddr addr, int port, + const char *error_msg, int error_code) +{ + Rlogin rlogin = (Rlogin) plug; + char addrbuf[256], *msg; + + sk_getaddr(addr, addrbuf, lenof(addrbuf)); + + if (type == 0) + msg = dupprintf("Connecting to %s port %d", addrbuf, port); + else + msg = dupprintf("Failed to connect to %s: %s", addrbuf, error_msg); + + logevent(rlogin->frontend, msg); + sfree(msg); +} + +static int rlogin_closing(Plug plug, const char *error_msg, int error_code, int calling_back) { Rlogin rlogin = (Rlogin) plug; + + /* + * We don't implement independent EOF in each direction for Telnet + * connections; as soon as we get word that the remote side has + * sent us EOF, we wind up the whole connection. + */ + if (rlogin->s) { sk_close(rlogin->s); rlogin->s = NULL; + if (error_msg) + rlogin->closed_on_socket_error = TRUE; + notify_remote_exit(rlogin->frontend); } if (error_msg) { /* A socket error has occurred. */ logevent(rlogin->frontend, error_msg); - connection_fatal("%s", error_msg); + connection_fatal(rlogin->frontend, "%s", error_msg); } /* Otherwise, the remote side closed the connection normally. */ return 0; } @@ -56,8 +95,10 @@ static int rlogin_receive(Plug plug, int urgent, char *data, int len) c = *data++; len--; - if (c == '\x80') + if (c == '\x80') { + rlogin->cansize = 1; rlogin_size(rlogin, rlogin->term_width, rlogin->term_height); + } /* * We should flush everything (aka Telnet SYNCH) if we see * 0x02, and we should turn off and on _local_ flow control @@ -89,6 +130,27 @@ 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); + p = conf_get_str(rlogin->conf, CONF_localusername); + sk_write(rlogin->s, p, strlen(p)); + sk_write(rlogin->s, &z, 1); + sk_write(rlogin->s, ruser, strlen(ruser)); + sk_write(rlogin->s, &z, 1); + p = conf_get_str(rlogin->conf, CONF_termtype); + sk_write(rlogin->s, p, strlen(p)); + sk_write(rlogin->s, "/", 1); + p = conf_get_str(rlogin->conf, CONF_termspeed); + sk_write(rlogin->s, p, strspn(p, "0123456789")); + rlogin->bufsize = sk_write(rlogin->s, &z, 1); + + rlogin->prompt = NULL; +} + /* * Called to set up the rlogin connection. * @@ -97,40 +159,55 @@ static void rlogin_sent(Plug plug, int bufsize) * Also places the canonical host name into `realhost'. It must be * freed by the caller. */ -static char *rlogin_init(void *frontend_handle, void **backend_handle, - Config *cfg, - char *host, int port, char **realhost, int nodelay) +static const char *rlogin_init(void *frontend_handle, void **backend_handle, + Conf *conf, + char *host, int port, char **realhost, + int nodelay, int keepalive) { static const struct plug_function_table fn_table = { + rlogin_log, rlogin_closing, rlogin_receive, rlogin_sent }; SockAddr addr; - char *err; + const char *err; Rlogin rlogin; + char *ruser; + int addressfamily; + char *loghost; - rlogin = smalloc(sizeof(*rlogin)); + rlogin = snew(struct rlogin_tag); rlogin->fn = &fn_table; rlogin->s = NULL; + rlogin->closed_on_socket_error = FALSE; rlogin->frontend = frontend_handle; - rlogin->term_width = cfg->width; - rlogin->term_height = cfg->height; + rlogin->term_width = conf_get_int(conf, CONF_width); + rlogin->term_height = conf_get_int(conf, CONF_height); rlogin->firstbyte = 1; + rlogin->cansize = 0; + rlogin->prompt = NULL; + rlogin->conf = conf_copy(conf); *backend_handle = rlogin; + addressfamily = conf_get_int(conf, CONF_addressfamily); /* * Try to find host. */ { char *buf; - buf = dupprintf("Looking up host \"%s\"", host); + buf = dupprintf("Looking up host \"%s\"%s", host, + (addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" : + (addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" : + ""))); logevent(rlogin->frontend, buf); sfree(buf); } - addr = name_lookup(host, port, realhost, cfg); - if ((err = sk_addr_error(addr)) != NULL) + addr = name_lookup(host, port, realhost, conf, addressfamily); + if ((err = sk_addr_error(addr)) != NULL) { + sk_addr_free(addr); return err; + } if (port < 0) port = 513; /* default rlogin port */ @@ -138,49 +215,69 @@ static char *rlogin_init(void *frontend_handle, void **backend_handle, /* * Open socket. */ - { - char *buf, addrbuf[100]; - sk_getaddr(addr, addrbuf, 100); - buf = dupprintf("Connecting to %s port %d", addrbuf, port); - logevent(rlogin->frontend, buf); - sfree(buf); - } rlogin->s = new_connection(addr, *realhost, port, 1, 0, - nodelay, (Plug) rlogin, cfg); + nodelay, keepalive, (Plug) rlogin, conf); if ((err = sk_socket_error(rlogin->s)) != NULL) return err; - sk_addr_free(addr); + loghost = conf_get_str(conf, CONF_loghost); + if (*loghost) { + char *colon; + + sfree(*realhost); + *realhost = dupstr(loghost); + colon = strrchr(*realhost, ':'); + if (colon) { + /* + * FIXME: if we ever update this aspect of ssh.c for + * IPv6 literal management, this should change in line + * with it. + */ + *colon++ = '\0'; + } + } /* - * Send local username, remote username, terminal/speed + * 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. */ - - { - char z = 0; - char *p; - 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, cfg->username, - strlen(cfg->username)); - 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(*p); p++) continue; - sk_write(rlogin->s, cfg->termspeed, p - cfg->termspeed); - rlogin->bufsize = sk_write(rlogin->s, &z, 1); + if ((ruser = get_remote_username(conf)) != NULL) { + rlogin_startup(rlogin, ruser); + sfree(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); + ret = get_userpass_input(rlogin->prompt, NULL, 0); + if (ret >= 0) { + rlogin_startup(rlogin, rlogin->prompt->prompts[0]->result); + } } return NULL; } +static void rlogin_free(void *handle) +{ + Rlogin rlogin = (Rlogin) handle; + + if (rlogin->prompt) + free_prompts(rlogin->prompt); + if (rlogin->s) + sk_close(rlogin->s); + conf_free(rlogin->conf); + sfree(rlogin); +} + /* * Stub routine (we don't have any need to reconfigure this backend). */ -static void rlogin_reconfig(void *handle, Config *cfg) +static void rlogin_reconfig(void *handle, Conf *conf) { } @@ -194,7 +291,21 @@ 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; } @@ -219,7 +330,7 @@ static void rlogin_size(void *handle, int width, int height) rlogin->term_width = width; rlogin->term_height = height; - if (rlogin->s == NULL) + if (rlogin->s == NULL || !rlogin->cansize) return; b[6] = rlogin->term_width >> 8; @@ -239,10 +350,19 @@ static void rlogin_special(void *handle, Telnet_Special code) return; } -static Socket rlogin_socket(void *handle) +/* + * Return a list of the special codes that make sense in this + * protocol. + */ +static const struct telnet_special *rlogin_get_specials(void *handle) +{ + return NULL; +} + +static int rlogin_connected(void *handle) { Rlogin rlogin = (Rlogin) handle; - return rlogin->s; + return rlogin->s != NULL; } static int rlogin_sendok(void *handle) @@ -275,24 +395,42 @@ static void rlogin_provide_logctx(void *handle, void *logctx) static int rlogin_exitcode(void *handle) { - /* Rlogin rlogin = (Rlogin) handle; */ - /* If we ever implement RSH, we'll probably need to do this properly */ + Rlogin rlogin = (Rlogin) handle; + if (rlogin->s != NULL) + return -1; /* still connected */ + else if (rlogin->closed_on_socket_error) + return INT_MAX; /* a socket error counts as an unclean exit */ + else + /* If we ever implement RSH, we'll probably need to do this properly */ + return 0; +} + +/* + * cfg_info for rlogin does nothing at all. + */ +static int rlogin_cfg_info(void *handle) +{ return 0; } Backend rlogin_backend = { rlogin_init, + rlogin_free, rlogin_reconfig, rlogin_send, rlogin_sendbuffer, rlogin_size, rlogin_special, - rlogin_socket, + rlogin_get_specials, + rlogin_connected, rlogin_exitcode, rlogin_sendok, rlogin_ldisc, rlogin_provide_ldisc, rlogin_provide_logctx, rlogin_unthrottle, - 1 + rlogin_cfg_info, + "rlogin", + PROT_RLOGIN, + 513 };