X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/e418595a28b7c7a36b48e998ca49d972ebfb42f8..6226c9390d23d6868edde63b9568891cd88631cc:/rlogin.c diff --git a/rlogin.c b/rlogin.c index b3e9eac9..833d4ea4 100644 --- a/rlogin.c +++ b/rlogin.c @@ -1,6 +1,10 @@ -#include +/* + * Rlogin backend. + */ + #include #include +#include #include "putty.h" @@ -11,60 +15,154 @@ #define TRUE 1 #endif -static Socket s = NULL; +#define RLOGIN_MAX_BACKLOG 4096 + +typedef struct rlogin_tag { + const struct plug_function_table *fn; + /* the above field _must_ be first in the structure */ -static void rlogin_size(void); + Socket s; + int bufsize; + int firstbyte; + int cansize; + int term_width, term_height; + void *frontend; +} *Rlogin; -static int sb_opt, sb_len; -static char *sb_buf = NULL; -static int sb_size = 0; -#define SB_DELTA 1024 +static void rlogin_size(void *handle, int width, int height); -static void c_write (char *buf, int len) { - from_backend(0, buf, len); +static void c_write(Rlogin rlogin, char *buf, int len) +{ + int backlog = from_backend(rlogin->frontend, 0, buf, len); + sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG); } -static int rlogin_receive (Socket s, int urgent, char *data, int len) { - if (!len) { - /* Connection has closed. */ - sk_close(s); - s = NULL; - return 0; +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); +} + +static int rlogin_closing(Plug plug, const char *error_msg, int error_code, + int calling_back) +{ + Rlogin rlogin = (Rlogin) plug; + if (rlogin->s) { + sk_close(rlogin->s); + rlogin->s = NULL; + notify_remote_exit(rlogin->frontend); } + if (error_msg) { + /* A socket error has occurred. */ + logevent(rlogin->frontend, error_msg); + connection_fatal(rlogin->frontend, "%s", error_msg); + } /* Otherwise, the remote side closed the connection normally. */ + return 0; +} + +static int rlogin_receive(Plug plug, int urgent, char *data, int len) +{ + Rlogin rlogin = (Rlogin) plug; if (urgent == 2) { - char c; - - c = *data++; len--; - if (c == 0x80) - rlogin_size(); - /* - * We should flush everything (aka Telnet SYNCH) if we see - * 0x02, and we should turn off and on _local_ flow control - * on 0x10 and 0x20 respectively. I'm not convinced it's - * worth it... - */ + char c; + + c = *data++; + len--; + 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 + * on 0x10 and 0x20 respectively. I'm not convinced it's + * worth it... + */ + } else { + /* + * Main rlogin protocol. This is really simple: the first + * byte is expected to be NULL and is ignored, and the rest + * is printed. + */ + if (rlogin->firstbyte) { + if (data[0] == '\0') { + data++; + len--; + } + rlogin->firstbyte = 0; + } + if (len > 0) + c_write(rlogin, data, len); } - c_write(data, len); return 1; } +static void rlogin_sent(Plug plug, int bufsize) +{ + Rlogin rlogin = (Rlogin) plug; + rlogin->bufsize = bufsize; +} + /* * Called to set up the rlogin connection. * * Returns an error message, or NULL on success. * - * Also places the canonical host name into `realhost'. + * Also places the canonical host name into `realhost'. It must be + * freed by the caller. */ -static char *rlogin_init (char *host, int port, char **realhost) { +static const char *rlogin_init(void *frontend_handle, void **backend_handle, + Config *cfg, + 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; + + rlogin = snew(struct rlogin_tag); + rlogin->fn = &fn_table; + rlogin->s = NULL; + rlogin->frontend = frontend_handle; + rlogin->term_width = cfg->width; + rlogin->term_height = cfg->height; + rlogin->firstbyte = 1; + rlogin->cansize = 0; + *backend_handle = rlogin; /* * Try to find host. */ - addr = sk_namelookup(host, realhost); - if ( (err = sk_addr_error(addr)) ) + { + char *buf; + buf = dupprintf("Looking up host \"%s\"%s", host, + (cfg->addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" : + (cfg->addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" : + ""))); + logevent(rlogin->frontend, buf); + sfree(buf); + } + addr = name_lookup(host, port, realhost, cfg, cfg->addressfamily); + if ((err = sk_addr_error(addr)) != NULL) { + sk_addr_free(addr); return err; + } if (port < 0) port = 513; /* default rlogin port */ @@ -72,77 +170,184 @@ static char *rlogin_init (char *host, int port, char **realhost) { /* * Open socket. */ - s = sk_new(addr, port, 1, rlogin_receive); - if ( (err = sk_socket_error(s)) ) + rlogin->s = new_connection(addr, *realhost, port, 1, 0, + nodelay, keepalive, (Plug) rlogin, cfg); + if ((err = sk_socket_error(rlogin->s)) != NULL) return err; - sk_addr_free(addr); - /* * Send local username, remote username, terminal/speed */ { - char z = 0; - char *p; - sk_write(s, &z, 1); - sk_write(s, cfg.localusername, strlen(cfg.localusername)); - sk_write(s, &z, 1); - sk_write(s, cfg.username, strlen(cfg.username)); - sk_write(s, &z, 1); - sk_write(s, cfg.termtype, strlen(cfg.termtype)); - sk_write(s, "/", 1); - for(p = cfg.termspeed; isdigit(*p); p++); - sk_write(s, cfg.termspeed, p - cfg.termspeed); - sk_write(s, &z, 1); + 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((unsigned char)*p); p++) continue; + sk_write(rlogin->s, cfg->termspeed, p - cfg->termspeed); + rlogin->bufsize = sk_write(rlogin->s, &z, 1); } - begin_session(); - return NULL; } +static void rlogin_free(void *handle) +{ + Rlogin rlogin = (Rlogin) handle; + + if (rlogin->s) + sk_close(rlogin->s); + sfree(rlogin); +} + +/* + * Stub routine (we don't have any need to reconfigure this backend). + */ +static void rlogin_reconfig(void *handle, Config *cfg) +{ +} + /* * Called to send data down the rlogin connection. */ -static void rlogin_send (char *buf, int len) { +static int rlogin_send(void *handle, char *buf, int len) +{ + Rlogin rlogin = (Rlogin) handle; - if (s == NULL) - return; + if (rlogin->s == NULL) + return 0; - sk_write(s, buf, len); + rlogin->bufsize = sk_write(rlogin->s, buf, len); + + return rlogin->bufsize; +} + +/* + * Called to query the current socket sendability status. + */ +static int rlogin_sendbuffer(void *handle) +{ + Rlogin rlogin = (Rlogin) handle; + return rlogin->bufsize; } /* * Called to set the size of the window */ -static void rlogin_size(void) { +static void rlogin_size(void *handle, int width, int height) +{ + Rlogin rlogin = (Rlogin) handle; char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 }; - b[6] = cols >> 8; b[7] = cols & 0xFF; - b[4] = rows >> 8; b[5] = rows & 0xFF; - sk_write(s, b, 12); + rlogin->term_width = width; + rlogin->term_height = height; + + if (rlogin->s == NULL || !rlogin->cansize) + return; + + b[6] = rlogin->term_width >> 8; + b[7] = rlogin->term_width & 0xFF; + b[4] = rlogin->term_height >> 8; + b[5] = rlogin->term_height & 0xFF; + rlogin->bufsize = sk_write(rlogin->s, b, 12); return; } /* * Send rlogin special codes. */ -static void rlogin_special (Telnet_Special code) { +static void rlogin_special(void *handle, Telnet_Special code) +{ /* Do nothing! */ return; } -static Socket rlogin_socket(void) { return s; } +/* + * 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 != NULL; +} + +static int rlogin_sendok(void *handle) +{ + /* Rlogin rlogin = (Rlogin) handle; */ + return 1; +} + +static void rlogin_unthrottle(void *handle, int backlog) +{ + Rlogin rlogin = (Rlogin) handle; + sk_set_frozen(rlogin->s, backlog > RLOGIN_MAX_BACKLOG); +} + +static int rlogin_ldisc(void *handle, int option) +{ + /* Rlogin rlogin = (Rlogin) handle; */ + return 0; +} + +static void rlogin_provide_ldisc(void *handle, void *ldisc) +{ + /* This is a stub. */ +} -static int rlogin_sendok(void) { return 1; } +static void rlogin_provide_logctx(void *handle, void *logctx) +{ + /* This is a stub. */ +} + +static int rlogin_exitcode(void *handle) +{ + Rlogin rlogin = (Rlogin) handle; + if (rlogin->s != NULL) + return -1; /* still connected */ + 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, + rlogin_cfg_info, 1 };