/* * "Raw" backend. */ #include <stdio.h> #include <stdlib.h> #include "putty.h" #ifndef FALSE #define FALSE 0 #endif #ifndef TRUE #define TRUE 1 #endif #define RAW_MAX_BACKLOG 4096 typedef struct raw_backend_data { const struct plug_function_table *fn; /* the above field _must_ be first in the structure */ Socket s; int bufsize; void *frontend; } *Raw; static void raw_size(void *handle, int width, int height); static void c_write(Raw raw, char *buf, int len) { int backlog = from_backend(raw->frontend, 0, buf, len); sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG); } static void raw_log(Plug plug, int type, SockAddr addr, int port, const char *error_msg, int error_code) { Raw raw = (Raw) 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(raw->frontend, msg); } static int raw_closing(Plug plug, const char *error_msg, int error_code, int calling_back) { Raw raw = (Raw) plug; if (raw->s) { sk_close(raw->s); raw->s = NULL; notify_remote_exit(raw->frontend); } if (error_msg) { /* A socket error has occurred. */ logevent(raw->frontend, error_msg); connection_fatal(raw->frontend, "%s", error_msg); } /* Otherwise, the remote side closed the connection normally. */ return 0; } static int raw_receive(Plug plug, int urgent, char *data, int len) { Raw raw = (Raw) plug; c_write(raw, data, len); return 1; } static void raw_sent(Plug plug, int bufsize) { Raw raw = (Raw) plug; raw->bufsize = bufsize; } /* * Called to set up the raw connection. * * Returns an error message, or NULL on success. * * Also places the canonical host name into `realhost'. It must be * freed by the caller. */ static const char *raw_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 = { raw_log, raw_closing, raw_receive, raw_sent }; SockAddr addr; const char *err; Raw raw; raw = snew(struct raw_backend_data); raw->fn = &fn_table; raw->s = NULL; *backend_handle = raw; raw->frontend = frontend_handle; /* * Try to find host. */ { char *buf; buf = dupprintf("Looking up host \"%s\"%s", host, (cfg->addressfamily == ADDRTYPE_IPV4 ? " (IPv4)" : (cfg->addressfamily == ADDRTYPE_IPV6 ? " (IPv6)" : ""))); logevent(raw->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 = 23; /* default telnet port */ /* * Open socket. */ raw->s = new_connection(addr, *realhost, port, 0, 1, nodelay, keepalive, (Plug) raw, cfg); if ((err = sk_socket_error(raw->s)) != NULL) return err; if (*cfg->loghost) { char *colon; sfree(*realhost); *realhost = dupstr(cfg->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'; } } return NULL; } static void raw_free(void *handle) { Raw raw = (Raw) handle; if (raw->s) sk_close(raw->s); sfree(raw); } /* * Stub routine (we don't have any need to reconfigure this backend). */ static void raw_reconfig(void *handle, Config *cfg) { } /* * Called to send data down the raw connection. */ static int raw_send(void *handle, char *buf, int len) { Raw raw = (Raw) handle; if (raw->s == NULL) return 0; raw->bufsize = sk_write(raw->s, buf, len); return raw->bufsize; } /* * Called to query the current socket sendability status. */ static int raw_sendbuffer(void *handle) { Raw raw = (Raw) handle; return raw->bufsize; } /* * Called to set the size of the window */ static void raw_size(void *handle, int width, int height) { /* Do nothing! */ return; } /* * Send raw special codes. */ static void raw_special(void *handle, Telnet_Special code) { /* Do nothing! */ return; } /* * Return a list of the special codes that make sense in this * protocol. */ static const struct telnet_special *raw_get_specials(void *handle) { return NULL; } static int raw_connected(void *handle) { Raw raw = (Raw) handle; return raw->s != NULL; } static int raw_sendok(void *handle) { return 1; } static void raw_unthrottle(void *handle, int backlog) { Raw raw = (Raw) handle; sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG); } static int raw_ldisc(void *handle, int option) { if (option == LD_EDIT || option == LD_ECHO) return 1; return 0; } static void raw_provide_ldisc(void *handle, void *ldisc) { /* This is a stub. */ } static void raw_provide_logctx(void *handle, void *logctx) { /* This is a stub. */ } static int raw_exitcode(void *handle) { Raw raw = (Raw) handle; if (raw->s != NULL) return -1; /* still connected */ else /* Exit codes are a meaningless concept in the Raw protocol */ return 0; } /* * cfg_info for Raw does nothing at all. */ static int raw_cfg_info(void *handle) { return 0; } Backend raw_backend = { raw_init, raw_free, raw_reconfig, raw_send, raw_sendbuffer, raw_size, raw_special, raw_get_specials, raw_connected, raw_exitcode, raw_sendok, raw_ldisc, raw_provide_ldisc, raw_provide_logctx, raw_unthrottle, raw_cfg_info, "raw", PROT_RAW, 0 };