| 1 | #include <stdio.h> |
| 2 | #include <stdlib.h> |
| 3 | |
| 4 | #include "putty.h" |
| 5 | #include "ssh.h" |
| 6 | |
| 7 | #ifndef FALSE |
| 8 | #define FALSE 0 |
| 9 | #endif |
| 10 | #ifndef TRUE |
| 11 | #define TRUE 1 |
| 12 | #endif |
| 13 | |
| 14 | #define GET_32BIT_LSB_FIRST(cp) \ |
| 15 | (((unsigned long)(unsigned char)(cp)[0]) | \ |
| 16 | ((unsigned long)(unsigned char)(cp)[1] << 8) | \ |
| 17 | ((unsigned long)(unsigned char)(cp)[2] << 16) | \ |
| 18 | ((unsigned long)(unsigned char)(cp)[3] << 24)) |
| 19 | |
| 20 | #define PUT_32BIT_LSB_FIRST(cp, value) ( \ |
| 21 | (cp)[0] = (value), \ |
| 22 | (cp)[1] = (value) >> 8, \ |
| 23 | (cp)[2] = (value) >> 16, \ |
| 24 | (cp)[3] = (value) >> 24 ) |
| 25 | |
| 26 | #define GET_16BIT_LSB_FIRST(cp) \ |
| 27 | (((unsigned long)(unsigned char)(cp)[0]) | \ |
| 28 | ((unsigned long)(unsigned char)(cp)[1] << 8)) |
| 29 | |
| 30 | #define PUT_16BIT_LSB_FIRST(cp, value) ( \ |
| 31 | (cp)[0] = (value), \ |
| 32 | (cp)[1] = (value) >> 8 ) |
| 33 | |
| 34 | #define GET_32BIT_MSB_FIRST(cp) \ |
| 35 | (((unsigned long)(unsigned char)(cp)[0] << 24) | \ |
| 36 | ((unsigned long)(unsigned char)(cp)[1] << 16) | \ |
| 37 | ((unsigned long)(unsigned char)(cp)[2] << 8) | \ |
| 38 | ((unsigned long)(unsigned char)(cp)[3])) |
| 39 | |
| 40 | #define PUT_32BIT_MSB_FIRST(cp, value) ( \ |
| 41 | (cp)[0] = (value) >> 24, \ |
| 42 | (cp)[1] = (value) >> 16, \ |
| 43 | (cp)[2] = (value) >> 8, \ |
| 44 | (cp)[3] = (value) ) |
| 45 | |
| 46 | #define GET_16BIT_MSB_FIRST(cp) \ |
| 47 | (((unsigned long)(unsigned char)(cp)[0] << 8) | \ |
| 48 | ((unsigned long)(unsigned char)(cp)[1])) |
| 49 | |
| 50 | #define PUT_16BIT_MSB_FIRST(cp, value) ( \ |
| 51 | (cp)[0] = (value) >> 8, \ |
| 52 | (cp)[1] = (value) ) |
| 53 | |
| 54 | struct pfwd_queue { |
| 55 | struct pfwd_queue *next; |
| 56 | char *buf; |
| 57 | }; |
| 58 | |
| 59 | struct PFwdPrivate { |
| 60 | struct plug_function_table *fn; |
| 61 | /* the above variable absolutely *must* be the first in this structure */ |
| 62 | void *c; /* (channel) data used by ssh.c */ |
| 63 | void *backhandle; /* instance of SSH backend itself */ |
| 64 | /* Note that backhandle need not be filled in if c is non-NULL */ |
| 65 | Socket s; |
| 66 | char hostname[128]; |
| 67 | int throttled, throttle_override; |
| 68 | int port; |
| 69 | int ready; |
| 70 | struct pfwd_queue *waiting; |
| 71 | }; |
| 72 | |
| 73 | void pfd_close(Socket s); |
| 74 | |
| 75 | |
| 76 | static int pfd_closing(Plug plug, char *error_msg, int error_code, |
| 77 | int calling_back) |
| 78 | { |
| 79 | struct PFwdPrivate *pr = (struct PFwdPrivate *) plug; |
| 80 | |
| 81 | /* |
| 82 | * We have no way to communicate down the forwarded connection, |
| 83 | * so if an error occurred on the socket, we just ignore it |
| 84 | * and treat it like a proper close. |
| 85 | */ |
| 86 | sshfwd_close(pr->c); |
| 87 | pfd_close(pr->s); |
| 88 | return 1; |
| 89 | } |
| 90 | |
| 91 | static int pfd_receive(Plug plug, int urgent, char *data, int len) |
| 92 | { |
| 93 | struct PFwdPrivate *pr = (struct PFwdPrivate *) plug; |
| 94 | if (pr->ready) { |
| 95 | if (sshfwd_write(pr->c, data, len) > 0) { |
| 96 | pr->throttled = 1; |
| 97 | sk_set_frozen(pr->s, 1); |
| 98 | } |
| 99 | } |
| 100 | return 1; |
| 101 | } |
| 102 | |
| 103 | static void pfd_sent(Plug plug, int bufsize) |
| 104 | { |
| 105 | struct PFwdPrivate *pr = (struct PFwdPrivate *) plug; |
| 106 | |
| 107 | sshfwd_unthrottle(pr->c, bufsize); |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * Called when receiving a PORT OPEN from the server |
| 112 | */ |
| 113 | char *pfd_newconnect(Socket *s, char *hostname, int port, void *c) |
| 114 | { |
| 115 | static struct plug_function_table fn_table = { |
| 116 | pfd_closing, |
| 117 | pfd_receive, |
| 118 | pfd_sent, |
| 119 | NULL |
| 120 | }; |
| 121 | |
| 122 | SockAddr addr; |
| 123 | char *err, *dummy_realhost; |
| 124 | struct PFwdPrivate *pr; |
| 125 | |
| 126 | /* |
| 127 | * Try to find host. |
| 128 | */ |
| 129 | addr = sk_namelookup(hostname, &dummy_realhost); |
| 130 | if ((err = sk_addr_error(addr))) |
| 131 | return err; |
| 132 | |
| 133 | /* |
| 134 | * Open socket. |
| 135 | */ |
| 136 | pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate)); |
| 137 | pr->fn = &fn_table; |
| 138 | pr->throttled = pr->throttle_override = 0; |
| 139 | pr->ready = 1; |
| 140 | pr->c = c; |
| 141 | pr->backhandle = NULL; /* we shouldn't need this */ |
| 142 | |
| 143 | pr->s = *s = new_connection(addr, dummy_realhost, port, 0, 1, 0, (Plug) pr); |
| 144 | if ((err = sk_socket_error(*s))) { |
| 145 | sfree(pr); |
| 146 | return err; |
| 147 | } |
| 148 | |
| 149 | sk_set_private_ptr(*s, pr); |
| 150 | sk_addr_free(addr); |
| 151 | return NULL; |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | called when someone connects to the local port |
| 156 | */ |
| 157 | |
| 158 | static int pfd_accepting(Plug p, void *sock) |
| 159 | { |
| 160 | static struct plug_function_table fn_table = { |
| 161 | pfd_closing, |
| 162 | pfd_receive, |
| 163 | pfd_sent, |
| 164 | NULL |
| 165 | }; |
| 166 | struct PFwdPrivate *pr, *org; |
| 167 | Socket s; |
| 168 | char *err; |
| 169 | |
| 170 | org = (struct PFwdPrivate *)p; |
| 171 | pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate)); |
| 172 | pr->fn = &fn_table; |
| 173 | |
| 174 | pr->c = NULL; |
| 175 | pr->backhandle = org->backhandle; |
| 176 | |
| 177 | pr->s = s = sk_register(sock, (Plug) pr); |
| 178 | if ((err = sk_socket_error(s))) { |
| 179 | sfree(pr); |
| 180 | return err != NULL; |
| 181 | } |
| 182 | |
| 183 | pr->c = new_sock_channel(org->backhandle, s); |
| 184 | |
| 185 | strcpy(pr->hostname, org->hostname); |
| 186 | pr->port = org->port; |
| 187 | pr->throttled = pr->throttle_override = 0; |
| 188 | pr->ready = 0; |
| 189 | pr->waiting = NULL; |
| 190 | |
| 191 | sk_set_private_ptr(s, pr); |
| 192 | |
| 193 | if (pr->c == NULL) { |
| 194 | sfree(pr); |
| 195 | return 1; |
| 196 | } else { |
| 197 | /* asks to forward to the specified host/port for this */ |
| 198 | ssh_send_port_open(pr->c, pr->hostname, pr->port, "forwarding"); |
| 199 | } |
| 200 | |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | |
| 205 | /* Add a new forwarding from port -> desthost:destport |
| 206 | sets up a listener on the local machine on port |
| 207 | */ |
| 208 | char *pfd_addforward(char *desthost, int destport, int port, void *backhandle) |
| 209 | { |
| 210 | static struct plug_function_table fn_table = { |
| 211 | pfd_closing, |
| 212 | pfd_receive, /* should not happen... */ |
| 213 | pfd_sent, /* also should not happen */ |
| 214 | pfd_accepting |
| 215 | }; |
| 216 | |
| 217 | char *err; |
| 218 | struct PFwdPrivate *pr; |
| 219 | Socket s; |
| 220 | |
| 221 | /* |
| 222 | * Open socket. |
| 223 | */ |
| 224 | pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate)); |
| 225 | pr->fn = &fn_table; |
| 226 | pr->c = NULL; |
| 227 | strcpy(pr->hostname, desthost); |
| 228 | pr->port = destport; |
| 229 | pr->throttled = pr->throttle_override = 0; |
| 230 | pr->ready = 0; |
| 231 | pr->waiting = NULL; |
| 232 | pr->backhandle = backhandle; |
| 233 | |
| 234 | pr->s = s = new_listener(port, (Plug) pr, !cfg.lport_acceptall); |
| 235 | if ((err = sk_socket_error(s))) { |
| 236 | sfree(pr); |
| 237 | return err; |
| 238 | } |
| 239 | |
| 240 | sk_set_private_ptr(s, pr); |
| 241 | |
| 242 | return NULL; |
| 243 | } |
| 244 | |
| 245 | void pfd_close(Socket s) |
| 246 | { |
| 247 | struct PFwdPrivate *pr; |
| 248 | |
| 249 | if (!s) |
| 250 | return; |
| 251 | |
| 252 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
| 253 | |
| 254 | sfree(pr); |
| 255 | |
| 256 | sk_close(s); |
| 257 | } |
| 258 | |
| 259 | void pfd_unthrottle(Socket s) |
| 260 | { |
| 261 | struct PFwdPrivate *pr; |
| 262 | if (!s) |
| 263 | return; |
| 264 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
| 265 | |
| 266 | pr->throttled = 0; |
| 267 | sk_set_frozen(s, pr->throttled || pr->throttle_override); |
| 268 | } |
| 269 | |
| 270 | void pfd_override_throttle(Socket s, int enable) |
| 271 | { |
| 272 | struct PFwdPrivate *pr; |
| 273 | if (!s) |
| 274 | return; |
| 275 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
| 276 | |
| 277 | pr->throttle_override = enable; |
| 278 | sk_set_frozen(s, pr->throttled || pr->throttle_override); |
| 279 | } |
| 280 | |
| 281 | /* |
| 282 | * Called to send data down the raw connection. |
| 283 | */ |
| 284 | int pfd_send(Socket s, char *data, int len) |
| 285 | { |
| 286 | if (s == NULL) |
| 287 | return 0; |
| 288 | return sk_write(s, data, len); |
| 289 | } |
| 290 | |
| 291 | |
| 292 | void pfd_confirm(Socket s) |
| 293 | { |
| 294 | struct PFwdPrivate *pr; |
| 295 | |
| 296 | if (s == NULL) |
| 297 | return; |
| 298 | |
| 299 | pr = (struct PFwdPrivate *) sk_get_private_ptr(s); |
| 300 | pr->ready = 1; |
| 301 | sk_set_frozen(s, 0); |
| 302 | sk_write(s, NULL, 0); |
| 303 | } |