| 1 | #include <windows.h> |
| 2 | #include <stdio.h> |
| 3 | #include <stdlib.h> |
| 4 | |
| 5 | #include "putty.h" |
| 6 | |
| 7 | #ifndef FALSE |
| 8 | #define FALSE 0 |
| 9 | #endif |
| 10 | #ifndef TRUE |
| 11 | #define TRUE 1 |
| 12 | #endif |
| 13 | |
| 14 | #define RAW_MAX_BACKLOG 4096 |
| 15 | |
| 16 | typedef struct raw_backend_data { |
| 17 | const struct plug_function_table *fn; |
| 18 | /* the above field _must_ be first in the structure */ |
| 19 | |
| 20 | Socket s; |
| 21 | int bufsize; |
| 22 | void *frontend; |
| 23 | } *Raw; |
| 24 | |
| 25 | static void raw_size(void *handle, int width, int height); |
| 26 | |
| 27 | static void c_write(Raw raw, char *buf, int len) |
| 28 | { |
| 29 | int backlog = from_backend(raw->frontend, 0, buf, len); |
| 30 | sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG); |
| 31 | } |
| 32 | |
| 33 | static int raw_closing(Plug plug, char *error_msg, int error_code, |
| 34 | int calling_back) |
| 35 | { |
| 36 | Raw raw = (Raw) plug; |
| 37 | |
| 38 | if (raw->s) { |
| 39 | sk_close(raw->s); |
| 40 | raw->s = NULL; |
| 41 | } |
| 42 | if (error_msg) { |
| 43 | /* A socket error has occurred. */ |
| 44 | logevent(error_msg); |
| 45 | connection_fatal("%s", error_msg); |
| 46 | } /* Otherwise, the remote side closed the connection normally. */ |
| 47 | return 0; |
| 48 | } |
| 49 | |
| 50 | static int raw_receive(Plug plug, int urgent, char *data, int len) |
| 51 | { |
| 52 | Raw raw = (Raw) plug; |
| 53 | c_write(raw, data, len); |
| 54 | return 1; |
| 55 | } |
| 56 | |
| 57 | static void raw_sent(Plug plug, int bufsize) |
| 58 | { |
| 59 | Raw raw = (Raw) plug; |
| 60 | raw->bufsize = bufsize; |
| 61 | } |
| 62 | |
| 63 | /* |
| 64 | * Called to set up the raw connection. |
| 65 | * |
| 66 | * Returns an error message, or NULL on success. |
| 67 | * |
| 68 | * Also places the canonical host name into `realhost'. It must be |
| 69 | * freed by the caller. |
| 70 | */ |
| 71 | static char *raw_init(void *frontend_handle, void **backend_handle, |
| 72 | char *host, int port, char **realhost, int nodelay) |
| 73 | { |
| 74 | static const struct plug_function_table fn_table = { |
| 75 | raw_closing, |
| 76 | raw_receive, |
| 77 | raw_sent |
| 78 | }; |
| 79 | SockAddr addr; |
| 80 | char *err; |
| 81 | Raw raw; |
| 82 | |
| 83 | raw = smalloc(sizeof(*raw)); |
| 84 | raw->fn = &fn_table; |
| 85 | raw->s = NULL; |
| 86 | *backend_handle = raw; |
| 87 | |
| 88 | raw->frontend = frontend_handle; |
| 89 | |
| 90 | /* |
| 91 | * Try to find host. |
| 92 | */ |
| 93 | { |
| 94 | char buf[200]; |
| 95 | sprintf(buf, "Looking up host \"%.170s\"", host); |
| 96 | logevent(buf); |
| 97 | } |
| 98 | addr = sk_namelookup(host, realhost); |
| 99 | if ((err = sk_addr_error(addr))) |
| 100 | return err; |
| 101 | |
| 102 | if (port < 0) |
| 103 | port = 23; /* default telnet port */ |
| 104 | |
| 105 | /* |
| 106 | * Open socket. |
| 107 | */ |
| 108 | { |
| 109 | char buf[200], addrbuf[100]; |
| 110 | sk_getaddr(addr, addrbuf, 100); |
| 111 | sprintf(buf, "Connecting to %.100s port %d", addrbuf, port); |
| 112 | logevent(buf); |
| 113 | } |
| 114 | raw->s = new_connection(addr, *realhost, port, 0, 1, nodelay, (Plug) raw); |
| 115 | if ((err = sk_socket_error(raw->s))) |
| 116 | return err; |
| 117 | |
| 118 | sk_addr_free(addr); |
| 119 | |
| 120 | return NULL; |
| 121 | } |
| 122 | |
| 123 | /* |
| 124 | * Called to send data down the raw connection. |
| 125 | */ |
| 126 | static int raw_send(void *handle, char *buf, int len) |
| 127 | { |
| 128 | Raw raw = (Raw) handle; |
| 129 | |
| 130 | if (raw->s == NULL) |
| 131 | return 0; |
| 132 | |
| 133 | raw->bufsize = sk_write(raw->s, buf, len); |
| 134 | |
| 135 | return raw->bufsize; |
| 136 | } |
| 137 | |
| 138 | /* |
| 139 | * Called to query the current socket sendability status. |
| 140 | */ |
| 141 | static int raw_sendbuffer(void *handle) |
| 142 | { |
| 143 | Raw raw = (Raw) handle; |
| 144 | return raw->bufsize; |
| 145 | } |
| 146 | |
| 147 | /* |
| 148 | * Called to set the size of the window |
| 149 | */ |
| 150 | static void raw_size(void *handle, int width, int height) |
| 151 | { |
| 152 | /* Do nothing! */ |
| 153 | return; |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * Send raw special codes. |
| 158 | */ |
| 159 | static void raw_special(void *handle, Telnet_Special code) |
| 160 | { |
| 161 | /* Do nothing! */ |
| 162 | return; |
| 163 | } |
| 164 | |
| 165 | static Socket raw_socket(void *handle) |
| 166 | { |
| 167 | Raw raw = (Raw) handle; |
| 168 | return raw->s; |
| 169 | } |
| 170 | |
| 171 | static int raw_sendok(void *handle) |
| 172 | { |
| 173 | return 1; |
| 174 | } |
| 175 | |
| 176 | static void raw_unthrottle(void *handle, int backlog) |
| 177 | { |
| 178 | Raw raw = (Raw) handle; |
| 179 | sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG); |
| 180 | } |
| 181 | |
| 182 | static int raw_ldisc(void *handle, int option) |
| 183 | { |
| 184 | if (option == LD_EDIT || option == LD_ECHO) |
| 185 | return 1; |
| 186 | return 0; |
| 187 | } |
| 188 | |
| 189 | static int raw_exitcode(void *handle) |
| 190 | { |
| 191 | /* Exit codes are a meaningless concept in the Raw protocol */ |
| 192 | return 0; |
| 193 | } |
| 194 | |
| 195 | Backend raw_backend = { |
| 196 | raw_init, |
| 197 | raw_send, |
| 198 | raw_sendbuffer, |
| 199 | raw_size, |
| 200 | raw_special, |
| 201 | raw_socket, |
| 202 | raw_exitcode, |
| 203 | raw_sendok, |
| 204 | raw_ldisc, |
| 205 | raw_unthrottle, |
| 206 | 1 |
| 207 | }; |