diff options
Diffstat (limited to 'tools/plink/raw.c')
| -rw-r--r-- | tools/plink/raw.c | 300 |
1 files changed, 300 insertions, 0 deletions
diff --git a/tools/plink/raw.c b/tools/plink/raw.c new file mode 100644 index 000000000..ea51d74a7 --- /dev/null +++ b/tools/plink/raw.c @@ -0,0 +1,300 @@ +/*
+ * "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
+};
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