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f670f4ebb1
Most, if not all, were for compatibility with the classic C++Builder compiler (declarations in the middle of code + inline structure initializers) Source commit: a9f38c3a07777e538c3c6e0fbdd38e9d68327dfa
137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
/*
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* SOCKS 4 proxy negotiation.
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*/
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#include "putty.h"
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#include "network.h"
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#include "proxy.h"
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#include "socks.h"
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#include "sshcr.h"
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typedef struct Socks4ProxyNegotiator {
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int crLine;
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ProxyNegotiator pn;
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} Socks4ProxyNegotiator;
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static ProxyNegotiator *proxy_socks4_new(const ProxyNegotiatorVT *vt)
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{
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Socks4ProxyNegotiator *s = snew(Socks4ProxyNegotiator);
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s->pn.vt = vt;
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s->crLine = 0;
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return &s->pn;
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}
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static void proxy_socks4_free(ProxyNegotiator *pn)
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{
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Socks4ProxyNegotiator *s = container_of(pn, Socks4ProxyNegotiator, pn);
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sfree(s);
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}
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static void proxy_socks4_process_queue(ProxyNegotiator *pn)
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{
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Socks4ProxyNegotiator *s = container_of(pn, Socks4ProxyNegotiator, pn);
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crBegin(s->crLine);
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{
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char hostname[512];
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bool write_hostname = false;
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/*
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* SOCKS 4 request packet:
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*
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* byte version
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* byte command
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* uint16 destination port number
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* uint32 destination IPv4 address (or something in the
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* SOCKS4A_NAME_FOLLOWS range)
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* asciz username
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* asciz destination hostname (if we sent SOCKS4A_NAME_FOLLOWS_*)
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*/
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put_byte(pn->output, SOCKS4_REQUEST_VERSION);
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put_byte(pn->output, SOCKS_CMD_CONNECT);
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put_uint16(pn->output, pn->ps->remote_port);
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switch (sk_addrtype(pn->ps->remote_addr)) {
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case ADDRTYPE_IPV4: {
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char addr[4];
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sk_addrcopy(pn->ps->remote_addr, addr);
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put_data(pn->output, addr, 4);
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break;
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}
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case ADDRTYPE_NAME:
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put_uint32(pn->output, SOCKS4A_NAME_FOLLOWS_BASE);
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sk_getaddr(pn->ps->remote_addr, hostname, lenof(hostname));
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write_hostname = true;
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break;
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case ADDRTYPE_IPV6:
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pn->error = dupstr("SOCKS version 4 does not support IPv6");
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crStopV;
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}
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put_asciz(pn->output, conf_get_str(pn->ps->conf, CONF_proxy_username));
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if (write_hostname)
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put_asciz(pn->output, hostname);
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}
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crReturnV;
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{
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unsigned char data[8];
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crMaybeWaitUntilV(bufchain_try_fetch_consume(pn->input, data, 8));
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/*
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* SOCKS 4 response packet:
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*
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* byte version
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* byte status
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* uint16 port number
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* uint32 IPv4 address
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*
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* We don't need to worry about the port and destination address.
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*/
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if (data[0] != SOCKS4_REPLY_VERSION) {
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pn->error = dupprintf("SOCKS proxy response contained reply "
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"version number %d (expected %d)",
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(int)data[0], SOCKS4_REPLY_VERSION);
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crStopV;
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}
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switch (data[1]) {
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case SOCKS4_RESP_SUCCESS:
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pn->done = true;
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break;
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case SOCKS4_RESP_FAILURE:
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pn->error = dupstr("SOCKS server reported failure to connect");
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break;
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case SOCKS4_RESP_WANT_IDENTD:
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pn->error = dupstr("SOCKS server wanted IDENTD on client");
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break;
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case SOCKS4_RESP_IDENTD_MISMATCH:
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pn->error = dupstr("Username and IDENTD on client don't agree");
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break;
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default:
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pn->error = dupprintf("SOCKS server sent unrecognised error "
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"code %d", (int)data[1]);
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break;
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}
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crStopV;
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}
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crFinishV;
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}
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const struct ProxyNegotiatorVT socks4_proxy_negotiator_vt = {
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.new = proxy_socks4_new,
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.free = proxy_socks4_free,
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.process_queue = proxy_socks4_process_queue,
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.type = "SOCKS 4",
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};
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