mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-01-10 01:48:00 +00:00
72ff571148
each backend now stores all its internal variables in a big struct, and each backend function gets a pointer to this struct passed to it. This still isn't the end of the work - lots of subsidiary things still use globals, notably all the cipher and compressor modules and the X11 forwarding authentication stuff. But ssh.c itself has now been transformed, and that was the really painful bit, so from here on it all ought to be a sequence of much smaller and simpler pieces of work. [originally from svn r2127]
301 lines
6.3 KiB
C
301 lines
6.3 KiB
C
#include <windows.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "putty.h"
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#include "ssh.h"
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#ifndef FALSE
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#define FALSE 0
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#endif
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#ifndef TRUE
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#define TRUE 1
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#endif
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#define GET_32BIT_LSB_FIRST(cp) \
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(((unsigned long)(unsigned char)(cp)[0]) | \
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((unsigned long)(unsigned char)(cp)[1] << 8) | \
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((unsigned long)(unsigned char)(cp)[2] << 16) | \
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((unsigned long)(unsigned char)(cp)[3] << 24))
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#define PUT_32BIT_LSB_FIRST(cp, value) ( \
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(cp)[0] = (value), \
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(cp)[1] = (value) >> 8, \
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(cp)[2] = (value) >> 16, \
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(cp)[3] = (value) >> 24 )
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#define GET_16BIT_LSB_FIRST(cp) \
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(((unsigned long)(unsigned char)(cp)[0]) | \
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((unsigned long)(unsigned char)(cp)[1] << 8))
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#define PUT_16BIT_LSB_FIRST(cp, value) ( \
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(cp)[0] = (value), \
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(cp)[1] = (value) >> 8 )
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#define GET_32BIT_MSB_FIRST(cp) \
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(((unsigned long)(unsigned char)(cp)[0] << 24) | \
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((unsigned long)(unsigned char)(cp)[1] << 16) | \
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((unsigned long)(unsigned char)(cp)[2] << 8) | \
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((unsigned long)(unsigned char)(cp)[3]))
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#define PUT_32BIT_MSB_FIRST(cp, value) ( \
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(cp)[0] = (value) >> 24, \
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(cp)[1] = (value) >> 16, \
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(cp)[2] = (value) >> 8, \
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(cp)[3] = (value) )
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#define GET_16BIT_MSB_FIRST(cp) \
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(((unsigned long)(unsigned char)(cp)[0] << 8) | \
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((unsigned long)(unsigned char)(cp)[1]))
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#define PUT_16BIT_MSB_FIRST(cp, value) ( \
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(cp)[0] = (value) >> 8, \
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(cp)[1] = (value) )
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struct pfwd_queue {
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struct pfwd_queue *next;
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char *buf;
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};
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struct PFwdPrivate {
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struct plug_function_table *fn;
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/* the above variable absolutely *must* be the first in this structure */
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void *c; /* (channel) data used by ssh.c */
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Socket s;
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char hostname[128];
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int throttled, throttle_override;
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int port;
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int ready;
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struct pfwd_queue *waiting;
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};
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void pfd_close(Socket s);
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static int pfd_closing(Plug plug, char *error_msg, int error_code,
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int calling_back)
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{
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struct PFwdPrivate *pr = (struct PFwdPrivate *) plug;
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/*
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* We have no way to communicate down the forwarded connection,
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* so if an error occurred on the socket, we just ignore it
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* and treat it like a proper close.
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*/
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sshfwd_close(pr->c);
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pfd_close(pr->s);
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return 1;
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}
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static int pfd_receive(Plug plug, int urgent, char *data, int len)
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{
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struct PFwdPrivate *pr = (struct PFwdPrivate *) plug;
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if (pr->ready) {
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if (sshfwd_write(pr->c, data, len) > 0) {
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pr->throttled = 1;
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sk_set_frozen(pr->s, 1);
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}
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}
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return 1;
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}
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static void pfd_sent(Plug plug, int bufsize)
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{
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struct PFwdPrivate *pr = (struct PFwdPrivate *) plug;
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sshfwd_unthrottle(pr->c, bufsize);
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}
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/*
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* Called when receiving a PORT OPEN from the server
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*/
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char *pfd_newconnect(Socket *s, char *hostname, int port, void *c)
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{
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static struct plug_function_table fn_table = {
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pfd_closing,
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pfd_receive,
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pfd_sent,
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NULL
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};
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SockAddr addr;
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char *err, *dummy_realhost;
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struct PFwdPrivate *pr;
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/*
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* Try to find host.
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*/
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addr = sk_namelookup(hostname, &dummy_realhost);
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if ((err = sk_addr_error(addr)))
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return err;
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/*
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* Open socket.
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*/
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pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate));
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pr->fn = &fn_table;
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pr->throttled = pr->throttle_override = 0;
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pr->ready = 1;
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pr->c = c;
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pr->s = *s = new_connection(addr, dummy_realhost, port, 0, 1, 0, (Plug) pr);
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if ((err = sk_socket_error(*s))) {
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sfree(pr);
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return err;
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}
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sk_set_private_ptr(*s, pr);
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sk_addr_free(addr);
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return NULL;
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}
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/*
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called when someone connects to the local port
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*/
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static int pfd_accepting(Plug p, void *sock)
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{
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static struct plug_function_table fn_table = {
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pfd_closing,
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pfd_receive,
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pfd_sent,
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NULL
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};
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struct PFwdPrivate *pr, *org;
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Socket s;
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char *err;
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org = (struct PFwdPrivate *)p;
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pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate));
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pr->fn = &fn_table;
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pr->c = NULL;
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pr->s = s = sk_register(sock, (Plug) pr);
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if ((err = sk_socket_error(s))) {
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sfree(pr);
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return err != NULL;
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}
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pr->c = new_sock_channel(backhandle, s);
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strcpy(pr->hostname, org->hostname);
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pr->port = org->port;
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pr->throttled = pr->throttle_override = 0;
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pr->ready = 0;
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pr->waiting = NULL;
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sk_set_private_ptr(s, pr);
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if (pr->c == NULL) {
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sfree(pr);
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return 1;
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} else {
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/* asks to forward to the specified host/port for this */
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ssh_send_port_open(backhandle, pr->c, pr->hostname,
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pr->port, "forwarding");
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}
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return 0;
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}
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/* Add a new forwarding from port -> desthost:destport
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sets up a listener on the local machine on port
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*/
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char *pfd_addforward(char *desthost, int destport, int port)
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{
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static struct plug_function_table fn_table = {
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pfd_closing,
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pfd_receive, /* should not happen... */
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pfd_sent, /* also should not happen */
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pfd_accepting
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};
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char *err;
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struct PFwdPrivate *pr;
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Socket s;
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/*
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* Open socket.
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*/
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pr = (struct PFwdPrivate *) smalloc(sizeof(struct PFwdPrivate));
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pr->fn = &fn_table;
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pr->c = NULL;
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strcpy(pr->hostname, desthost);
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pr->port = destport;
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pr->throttled = pr->throttle_override = 0;
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pr->ready = 0;
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pr->waiting = NULL;
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pr->s = s = new_listener(port, (Plug) pr, !cfg.lport_acceptall);
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if ((err = sk_socket_error(s))) {
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sfree(pr);
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return err;
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}
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sk_set_private_ptr(s, pr);
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return NULL;
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}
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void pfd_close(Socket s)
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{
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struct PFwdPrivate *pr;
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if (!s)
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return;
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pr = (struct PFwdPrivate *) sk_get_private_ptr(s);
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sfree(pr);
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sk_close(s);
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}
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void pfd_unthrottle(Socket s)
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{
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struct PFwdPrivate *pr;
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if (!s)
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return;
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pr = (struct PFwdPrivate *) sk_get_private_ptr(s);
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pr->throttled = 0;
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sk_set_frozen(s, pr->throttled || pr->throttle_override);
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}
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void pfd_override_throttle(Socket s, int enable)
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{
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struct PFwdPrivate *pr;
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if (!s)
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return;
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pr = (struct PFwdPrivate *) sk_get_private_ptr(s);
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pr->throttle_override = enable;
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sk_set_frozen(s, pr->throttled || pr->throttle_override);
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}
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/*
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* Called to send data down the raw connection.
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*/
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int pfd_send(Socket s, char *data, int len)
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{
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if (s == NULL)
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return 0;
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return sk_write(s, data, len);
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}
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void pfd_confirm(Socket s)
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{
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struct PFwdPrivate *pr;
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if (s == NULL)
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return;
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pr = (struct PFwdPrivate *) sk_get_private_ptr(s);
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pr->ready = 1;
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sk_set_frozen(s, 0);
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sk_write(s, NULL, 0);
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}
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