| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | |
| 4 | #include "putty.h" |
| 5 | |
| 6 | #ifndef FALSE |
| 7 | #define FALSE 0 |
| 8 | #endif |
| 9 | #ifndef TRUE |
| 10 | #define TRUE 1 |
| 11 | #endif |
| 12 | |
| 13 | #define RAW_MAX_BACKLOG 4096 |
| 14 | |
| 15 | typedef struct raw_backend_data { |
| 16 | const struct plug_function_table *fn; |
| 17 | /* the above field _must_ be first in the structure */ |
| 18 | |
| 19 | Socket s; |
| 20 | int bufsize; |
| 21 | void *frontend; |
| 22 | } *Raw; |
| 23 | |
| 24 | static void raw_size(void *handle, int width, int height); |
| 25 | |
| 26 | static void c_write(Raw raw, char *buf, int len) |
| 27 | { |
| 28 | int backlog = from_backend(raw->frontend, 0, buf, len); |
| 29 | sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG); |
| 30 | } |
| 31 | |
| 32 | static int raw_closing(Plug plug, char *error_msg, int error_code, |
| 33 | int calling_back) |
| 34 | { |
| 35 | Raw raw = (Raw) plug; |
| 36 | |
| 37 | if (raw->s) { |
| 38 | sk_close(raw->s); |
| 39 | raw->s = NULL; |
| 40 | } |
| 41 | if (error_msg) { |
| 42 | /* A socket error has occurred. */ |
| 43 | logevent(raw->frontend, error_msg); |
| 44 | connection_fatal("%s", error_msg); |
| 45 | } /* Otherwise, the remote side closed the connection normally. */ |
| 46 | return 0; |
| 47 | } |
| 48 | |
| 49 | static int raw_receive(Plug plug, int urgent, char *data, int len) |
| 50 | { |
| 51 | Raw raw = (Raw) plug; |
| 52 | c_write(raw, data, len); |
| 53 | return 1; |
| 54 | } |
| 55 | |
| 56 | static void raw_sent(Plug plug, int bufsize) |
| 57 | { |
| 58 | Raw raw = (Raw) plug; |
| 59 | raw->bufsize = bufsize; |
| 60 | } |
| 61 | |
| 62 | /* |
| 63 | * Called to set up the raw connection. |
| 64 | * |
| 65 | * Returns an error message, or NULL on success. |
| 66 | * |
| 67 | * Also places the canonical host name into `realhost'. It must be |
| 68 | * freed by the caller. |
| 69 | */ |
| 70 | static char *raw_init(void *frontend_handle, void **backend_handle, |
| 71 | char *host, int port, char **realhost, int nodelay) |
| 72 | { |
| 73 | static const struct plug_function_table fn_table = { |
| 74 | raw_closing, |
| 75 | raw_receive, |
| 76 | raw_sent |
| 77 | }; |
| 78 | SockAddr addr; |
| 79 | char *err; |
| 80 | Raw raw; |
| 81 | |
| 82 | raw = smalloc(sizeof(*raw)); |
| 83 | raw->fn = &fn_table; |
| 84 | raw->s = NULL; |
| 85 | *backend_handle = raw; |
| 86 | |
| 87 | raw->frontend = frontend_handle; |
| 88 | |
| 89 | /* |
| 90 | * Try to find host. |
| 91 | */ |
| 92 | { |
| 93 | char *buf; |
| 94 | buf = dupprintf("Looking up host \"%s\"", host); |
| 95 | logevent(raw->frontend, buf); |
| 96 | sfree(buf); |
| 97 | } |
| 98 | addr = name_lookup(host, port, 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, addrbuf[100]; |
| 110 | sk_getaddr(addr, addrbuf, 100); |
| 111 | buf = dupprintf("Connecting to %s port %d", addrbuf, port); |
| 112 | logevent(raw->frontend, buf); |
| 113 | sfree(buf); |
| 114 | } |
| 115 | raw->s = new_connection(addr, *realhost, port, 0, 1, nodelay, (Plug) raw); |
| 116 | if ((err = sk_socket_error(raw->s))) |
| 117 | return err; |
| 118 | |
| 119 | sk_addr_free(addr); |
| 120 | |
| 121 | return NULL; |
| 122 | } |
| 123 | |
| 124 | /* |
| 125 | * Called to send data down the raw connection. |
| 126 | */ |
| 127 | static int raw_send(void *handle, char *buf, int len) |
| 128 | { |
| 129 | Raw raw = (Raw) handle; |
| 130 | |
| 131 | if (raw->s == NULL) |
| 132 | return 0; |
| 133 | |
| 134 | raw->bufsize = sk_write(raw->s, buf, len); |
| 135 | |
| 136 | return raw->bufsize; |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * Called to query the current socket sendability status. |
| 141 | */ |
| 142 | static int raw_sendbuffer(void *handle) |
| 143 | { |
| 144 | Raw raw = (Raw) handle; |
| 145 | return raw->bufsize; |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * Called to set the size of the window |
| 150 | */ |
| 151 | static void raw_size(void *handle, int width, int height) |
| 152 | { |
| 153 | /* Do nothing! */ |
| 154 | return; |
| 155 | } |
| 156 | |
| 157 | /* |
| 158 | * Send raw special codes. |
| 159 | */ |
| 160 | static void raw_special(void *handle, Telnet_Special code) |
| 161 | { |
| 162 | /* Do nothing! */ |
| 163 | return; |
| 164 | } |
| 165 | |
| 166 | static Socket raw_socket(void *handle) |
| 167 | { |
| 168 | Raw raw = (Raw) handle; |
| 169 | return raw->s; |
| 170 | } |
| 171 | |
| 172 | static int raw_sendok(void *handle) |
| 173 | { |
| 174 | return 1; |
| 175 | } |
| 176 | |
| 177 | static void raw_unthrottle(void *handle, int backlog) |
| 178 | { |
| 179 | Raw raw = (Raw) handle; |
| 180 | sk_set_frozen(raw->s, backlog > RAW_MAX_BACKLOG); |
| 181 | } |
| 182 | |
| 183 | static int raw_ldisc(void *handle, int option) |
| 184 | { |
| 185 | if (option == LD_EDIT || option == LD_ECHO) |
| 186 | return 1; |
| 187 | return 0; |
| 188 | } |
| 189 | |
| 190 | static void raw_provide_ldisc(void *handle, void *ldisc) |
| 191 | { |
| 192 | /* This is a stub. */ |
| 193 | } |
| 194 | |
| 195 | static void raw_provide_logctx(void *handle, void *logctx) |
| 196 | { |
| 197 | /* This is a stub. */ |
| 198 | } |
| 199 | |
| 200 | static int raw_exitcode(void *handle) |
| 201 | { |
| 202 | /* Exit codes are a meaningless concept in the Raw protocol */ |
| 203 | return 0; |
| 204 | } |
| 205 | |
| 206 | Backend raw_backend = { |
| 207 | raw_init, |
| 208 | raw_send, |
| 209 | raw_sendbuffer, |
| 210 | raw_size, |
| 211 | raw_special, |
| 212 | raw_socket, |
| 213 | raw_exitcode, |
| 214 | raw_sendok, |
| 215 | raw_ldisc, |
| 216 | raw_provide_ldisc, |
| 217 | raw_provide_logctx, |
| 218 | raw_unthrottle, |
| 219 | 1 |
| 220 | }; |