X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/c91409da0ac0d3fb4a225ab85e14370514e4094e..a4451dd11df30dc2d0d262dd6c36642aa2a02b91:/raw.c diff --git a/raw.c b/raw.c index 61a7d668..b4b1108f 100644 --- a/raw.c +++ b/raw.c @@ -1,4 +1,7 @@ -#include +/* + * "Raw" backend. + */ + #include #include @@ -11,47 +14,119 @@ #define TRUE 1 #endif -static Socket s = NULL; +#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 */ -static void raw_size(void); + Socket s; + int bufsize; + void *frontend; +} *Raw; -static int sb_opt, sb_len; -static char *sb_buf = NULL; -static int sb_size = 0; -#define SB_DELTA 1024 +static void raw_size(void *handle, int width, int height); -static void c_write (char *buf, int len) { - from_backend(0, buf, len); +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 int raw_receive (Socket s, int urgent, char *data, int len) { - if (!len) { - /* Connection has closed. */ - sk_close(s); - s = NULL; - return 0; +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); } - c_write(data, len); + 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'. + * Also places the canonical host name into `realhost'. It must be + * freed by the caller. */ -static char *raw_init (char *host, int port, char **realhost) { +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; - char *err; + 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. */ - 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(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 */ @@ -59,35 +134,59 @@ static char *raw_init (char *host, int port, char **realhost) { /* * Open socket. */ - s = sk_new(addr, port, 0, raw_receive); - if ( (err = sk_socket_error(s)) ) + raw->s = new_connection(addr, *realhost, port, 0, 1, nodelay, keepalive, + (Plug) raw, cfg); + if ((err = sk_socket_error(raw->s)) != NULL) return err; - sk_addr_free(addr); + return NULL; +} + +static void raw_free(void *handle) +{ + Raw raw = (Raw) handle; - /* - * We have no pre-session phase. - */ - begin_session(); + if (raw->s) + sk_close(raw->s); + sfree(raw); +} - return NULL; +/* + * 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 void raw_send (char *buf, int len) { +static int raw_send(void *handle, char *buf, int len) +{ + Raw raw = (Raw) handle; - if (s == NULL) - return; + if (raw->s == NULL) + return 0; + + raw->bufsize = sk_write(raw->s, buf, len); - sk_write(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) { +static void raw_size(void *handle, int width, int height) +{ /* Do nothing! */ return; } @@ -95,21 +194,91 @@ static void raw_size(void) { /* * Send raw special codes. */ -static void raw_special (Telnet_Special code) { +static void raw_special(void *handle, Telnet_Special code) +{ /* Do nothing! */ return; } -static Socket raw_socket(void) { return s; } +/* + * 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; +} -static int raw_sendok(void) { return 1; } +/* + * 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_socket, + raw_get_specials, + raw_connected, + raw_exitcode, raw_sendok, - 1 + raw_ldisc, + raw_provide_ldisc, + raw_provide_logctx, + raw_unthrottle, + raw_cfg_info, + "raw", + PROT_RAW, + 0 };