X-Git-Url: https://git.distorted.org.uk/u/mdw/putty/blobdiff_plain/ec55b2200b3a40631648cfa02ed63207b58832fe..7e78000d8966255e919e3d8753fd784f4559ee55:/telnet.c diff --git a/telnet.c b/telnet.c index 97183481..29daf0f1 100644 --- a/telnet.c +++ b/telnet.c @@ -1,13 +1,6 @@ #include #include #include -#ifndef AUTO_WINSOCK -#ifdef WINSOCK_TWO -#include -#else -#include -#endif -#endif #include "putty.h" @@ -18,7 +11,7 @@ #define TRUE 1 #endif -static SOCKET s = INVALID_SOCKET; +static Socket s = NULL; #define IAC 255 /* interpret as command: */ #define DONT 254 /* you are not to use option */ @@ -139,36 +132,17 @@ static struct Opt *opts[] = { &o_we_sga, &o_they_sga, NULL }; +static int echoing = TRUE, editing = TRUE; + static int in_synch; static int sb_opt, sb_len; static char *sb_buf = NULL; static int sb_size = 0; #define SB_DELTA 1024 -static void try_write (void) { - while (outbuf_head != outbuf_reap) { - int end = (outbuf_reap < outbuf_head ? outbuf_head : OUTBUF_SIZE); - int len = end - outbuf_reap; - int ret; - - ret = send (s, outbuf+outbuf_reap, len, 0); - if (ret > 0) - outbuf_reap = (outbuf_reap + ret) & OUTBUF_MASK; - if (ret < len) - return; - } -} - -static void s_write (void *buf, int len) { - unsigned char *p = buf; - while (len--) { - int new_head = (outbuf_head + 1) & OUTBUF_MASK; - if (new_head != outbuf_reap) { - outbuf[outbuf_head] = *p++; - outbuf_head = new_head; - } - } - try_write(); +static void c_write1(int c) { + char cc = (char)c; + from_backend(0, &cc, 1); } static void log_option (char *sender, int cmd, int option) { @@ -184,7 +158,7 @@ static void send_opt (int cmd, int option) { unsigned char b[3]; b[0] = IAC; b[1] = cmd; b[2] = option; - s_write (b, 3); + sk_write(s, b, 3); log_option("client", cmd, option); } @@ -194,6 +168,17 @@ static void deactivate_option (struct Opt *o) { o->state = REALLY_INACTIVE; } +/* + * Generate side effects of enabling or disabling an option. + */ +static void option_side_effects(struct Opt *o, int enabled) { + if (o->option == TELOPT_ECHO && o->send == DO) + echoing = !enabled; + else if (o->option == TELOPT_SGA && o->send == DO) + editing = !enabled; + ldisc_send(NULL, 0); /* cause ldisc to notice the change */ +} + static void activate_option (struct Opt *o) { if (o->send == WILL && o->option == TELOPT_NAWS) telnet_size(); @@ -206,8 +191,7 @@ static void activate_option (struct Opt *o) { */ deactivate_option (o->option==TELOPT_NEW_ENVIRON ? &o_oenv : &o_nenv); } - if (o->option == TELOPT_ECHO && cfg.ldisc_term) - ldisc = &ldisc_simple; + option_side_effects(o, 1); } static void refused_option (struct Opt *o) { @@ -216,8 +200,7 @@ static void refused_option (struct Opt *o) { send_opt (WILL, TELOPT_OLD_ENVIRON); o_oenv.state = REQUESTED; } - if (o->option == TELOPT_ECHO && cfg.ldisc_term) - ldisc = &ldisc_term; + option_side_effects(o, 0); } static void proc_rec_opt (int cmd, int option) { @@ -252,6 +235,7 @@ static void proc_rec_opt (int cmd, int option) { case ACTIVE: (*o)->state = INACTIVE; send_opt ((*o)->nsend, option); + option_side_effects(*o, 0); break; case INACTIVE: case REALLY_INACTIVE: @@ -281,7 +265,7 @@ static void process_subneg (void) { strcpy(b+4, cfg.termspeed); n = 4 + strlen(cfg.termspeed); b[n] = IAC; b[n+1] = SE; - s_write (b, n+2); + sk_write(s, b, n+2); logevent("server:\tSB TSPEED SEND"); sprintf(logbuf, "client:\tSB TSPEED IS %s", cfg.termspeed); logevent (logbuf); @@ -297,7 +281,7 @@ static void process_subneg (void) { b[n+4] = (cfg.termtype[n] >= 'a' && cfg.termtype[n] <= 'z' ? cfg.termtype[n] + 'A'-'a' : cfg.termtype[n]); b[n+4] = IAC; b[n+5] = SE; - s_write (b, n+6); + sk_write(s, b, n+6); b[n+4] = 0; logevent("server:\tSB TTYPE SEND"); sprintf(logbuf, "client:\tSB TTYPE IS %s", b+4); @@ -362,7 +346,7 @@ static void process_subneg (void) { while (*e) b[n++] = *e++; } b[n++] = IAC; b[n++] = SE; - s_write (b, n); + sk_write(s, b, n); sprintf(logbuf, "client:\tSB %s IS %s", telopt(sb_opt), n==6 ? "" : ""); logevent (logbuf); @@ -481,37 +465,44 @@ static void do_telnet_read (char *buf, int len) { } } +static int telnet_closing (Plug plug, char *error_msg, int error_code, int calling_back) { + sk_close(s); + s = NULL; + if (error_msg) { + /* A socket error has occurred. */ + connection_fatal (error_msg); + } /* Otherwise, the remote side closed the connection normally. */ + return 0; +} + +static int telnet_receive(Plug plug, int urgent, char *data, int len) { + if(urgent) in_synch = TRUE; + do_telnet_read (data, len); + return 1; +} + /* - * Called to set up the Telnet connection. Will arrange for - * WM_NETEVENT messages to be passed to the specified window, whose - * window procedure should then call telnet_msg(). + * Called to set up the Telnet connection. * * Returns an error message, or NULL on success. * * Also places the canonical host name into `realhost'. */ -static char *telnet_init (HWND hwnd, char *host, int port, char **realhost) { - SOCKADDR_IN addr; - struct hostent *h; - unsigned long a; +static char *telnet_init (char *host, int port, char **realhost) { + static struct plug_function_table fn_table = { + telnet_closing, + telnet_receive + }, *fn_table_ptr = &fn_table; + + SockAddr addr; + char *err; /* * Try to find host. */ - if ( (a = inet_addr(host)) == (unsigned long) INADDR_NONE) { - if ( (h = gethostbyname(host)) == NULL) - switch (WSAGetLastError()) { - case WSAENETDOWN: return "Network is down"; - case WSAHOST_NOT_FOUND: case WSANO_DATA: - return "Host does not exist"; - case WSATRY_AGAIN: return "Host not found"; - default: return "gethostbyname: unknown error"; - } - memcpy (&a, h->h_addr, sizeof(a)); - *realhost = h->h_name; - } else - *realhost = host; - a = ntohl(a); + addr = sk_namelookup(host, realhost); + if ( (err = sk_addr_error(addr)) ) + return err; if (port < 0) port = 23; /* default telnet port */ @@ -519,64 +510,15 @@ static char *telnet_init (HWND hwnd, char *host, int port, char **realhost) { /* * Open socket. */ - s = socket(AF_INET, SOCK_STREAM, 0); - if (s == INVALID_SOCKET) - switch (WSAGetLastError()) { - case WSAENETDOWN: return "Network is down"; - case WSAEAFNOSUPPORT: return "TCP/IP support not present"; - default: return "socket(): unknown error"; - } - - { - BOOL b = TRUE; - setsockopt (s, SOL_SOCKET, SO_OOBINLINE, (void *)&b, sizeof(b)); - } - - /* - * Bind to local address. - */ - addr.sin_family = AF_INET; - addr.sin_addr.s_addr = htonl(INADDR_ANY); - addr.sin_port = htons(0); - if (bind (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) - switch (WSAGetLastError()) { - case WSAENETDOWN: return "Network is down"; - default: return "bind(): unknown error"; - } - - /* - * Connect to remote address. - */ - addr.sin_addr.s_addr = htonl(a); - addr.sin_port = htons((short)port); - if (connect (s, (struct sockaddr *)&addr, sizeof(addr)) == SOCKET_ERROR) - switch (WSAGetLastError()) { - case WSAENETDOWN: return "Network is down"; - case WSAECONNREFUSED: return "Connection refused"; - case WSAENETUNREACH: return "Network is unreachable"; - case WSAEHOSTUNREACH: return "No route to host"; - default: return "connect(): unknown error"; - } + s = sk_new(addr, port, 0, 1, &fn_table_ptr); + if ( (err = sk_socket_error(s)) ) + return err; - if (hwnd && WSAAsyncSelect (s, hwnd, WM_NETEVENT, FD_READ | - FD_WRITE | FD_OOB | FD_CLOSE) == SOCKET_ERROR) - switch (WSAGetLastError()) { - case WSAENETDOWN: return "Network is down"; - default: return "WSAAsyncSelect(): unknown error"; - } + sk_addr_free(addr); /* * Initialise option states. */ - if( cfg.ldisc_term ) - { - struct Opt **o; - - for (o = opts; *o; o++) - if ((*o)->state == REQUESTED) - (*o)->state = INACTIVE; - } - else { struct Opt **o; @@ -590,81 +532,10 @@ static char *telnet_init (HWND hwnd, char *host, int port, char **realhost) { */ in_synch = FALSE; - /* - * We have no pre-session phase. - */ - begin_session(); - return NULL; } /* - * Process a WM_NETEVENT message. Will return 0 if the connection - * has closed, or <0 for a socket error. - */ -static int telnet_msg (WPARAM wParam, LPARAM lParam) { - int ret; - /* This needs to be larger than the packet size now that inbuf - * cannot overflow, in fact the fewer calls we make to windows - * the faster we will run! - */ - char buf[16384]; - - /* - * Because reading less than the whole of the available pending - * data can generate an FD_READ event, we need to allow for the - * possibility that FD_READ may arrive with FD_CLOSE already in - * the queue; so it's possible that we can get here even with s - * invalid. If so, we return 1 and don't worry about it. - */ - if (s == INVALID_SOCKET) - return 1; - - if (WSAGETSELECTERROR(lParam) != 0) { - closesocket(s); - s = INVALID_SOCKET; - return -WSAGETSELECTERROR(lParam); - } - - switch (WSAGETSELECTEVENT(lParam)) { - case FD_READ: - case FD_CLOSE: - { - int clear_of_oob = 1; - - /* Don't check for error return; some shims don't support - * this ioctl. - */ - ioctlsocket (s, SIOCATMARK, &clear_of_oob); - - in_synch = !clear_of_oob; - - do { - ret = recv(s, buf, sizeof(buf), 0); - if (ret < 0 && WSAGetLastError() == WSAEWOULDBLOCK) - return 1; - if (ret < 0) { /* any _other_ error */ - closesocket(s); - s = INVALID_SOCKET; - return -10000-WSAGetLastError(); - } - if (ret == 0) { - s = INVALID_SOCKET; - return 0; - } - do_telnet_read (buf, ret); - } while (in_synch); - } - return 1; - case FD_WRITE: - if (outbuf_head != outbuf_reap) - try_write(); - return 1; - } - return 1; /* shouldn't happen, but WTF */ -} - -/* * Called to send data down the Telnet connection. */ static void telnet_send (char *buf, int len) { @@ -673,7 +544,7 @@ static void telnet_send (char *buf, int len) { static unsigned char cr[2] = { CR, NUL }; static unsigned char nl[2] = { CR, LF }; - if (s == INVALID_SOCKET) + if (s == NULL) return; p = buf; @@ -681,10 +552,10 @@ static void telnet_send (char *buf, int len) { char *q = p; while (iswritable((unsigned char)*p) && p < buf+len) p++; - s_write (q, p-q); + sk_write(s, q, p-q); while (p < buf+len && !iswritable((unsigned char)*p)) { - s_write ((unsigned char)*p == IAC ? iac : nl, 2); + sk_write(s, (unsigned char)*p == IAC ? iac : nl, 2); p++; } } @@ -697,13 +568,13 @@ static void telnet_size(void) { unsigned char b[16]; char logbuf[50]; - if (s == INVALID_SOCKET || o_naws.state != ACTIVE) + if (s == NULL || o_naws.state != ACTIVE) return; b[0] = IAC; b[1] = SB; b[2] = TELOPT_NAWS; b[3] = cols >> 8; b[4] = cols & 0xFF; b[5] = rows >> 8; b[6] = rows & 0xFF; b[7] = IAC; b[8] = SE; - s_write (b, 9); + sk_write(s, b, 9); sprintf(logbuf, "client:\tSB NAWS %d,%d", ((unsigned char)b[3] << 8) + (unsigned char)b[4], ((unsigned char)b[5] << 8) + (unsigned char)b[6]); @@ -716,28 +587,28 @@ static void telnet_size(void) { static void telnet_special (Telnet_Special code) { unsigned char b[2]; - if (s == INVALID_SOCKET) + if (s == NULL) return; b[0] = IAC; switch (code) { - case TS_AYT: b[1] = AYT; s_write (b, 2); break; - case TS_BRK: b[1] = BREAK; s_write (b, 2); break; - case TS_EC: b[1] = EC; s_write (b, 2); break; - case TS_EL: b[1] = EL; s_write (b, 2); break; - case TS_GA: b[1] = GA; s_write (b, 2); break; - case TS_NOP: b[1] = NOP; s_write (b, 2); break; - case TS_ABORT: b[1] = ABORT; s_write (b, 2); break; - case TS_AO: b[1] = AO; s_write (b, 2); break; - case TS_IP: b[1] = IP; s_write (b, 2); break; - case TS_SUSP: b[1] = SUSP; s_write (b, 2); break; - case TS_EOR: b[1] = EOR; s_write (b, 2); break; - case TS_EOF: b[1] = xEOF; s_write (b, 2); break; + case TS_AYT: b[1] = AYT; sk_write(s, b, 2); break; + case TS_BRK: b[1] = BREAK; sk_write(s, b, 2); break; + case TS_EC: b[1] = EC; sk_write(s, b, 2); break; + case TS_EL: b[1] = EL; sk_write(s, b, 2); break; + case TS_GA: b[1] = GA; sk_write(s, b, 2); break; + case TS_NOP: b[1] = NOP; sk_write(s, b, 2); break; + case TS_ABORT: b[1] = ABORT; sk_write(s, b, 2); break; + case TS_AO: b[1] = AO; sk_write(s, b, 2); break; + case TS_IP: b[1] = IP; sk_write(s, b, 2); break; + case TS_SUSP: b[1] = SUSP; sk_write(s, b, 2); break; + case TS_EOR: b[1] = EOR; sk_write(s, b, 2); break; + case TS_EOF: b[1] = xEOF; sk_write(s, b, 2); break; case TS_SYNCH: - outbuf_head = outbuf_reap = 0; - b[1] = DM; - send (s, b, 2, MSG_OOB); - break; + b[1] = DM; + sk_write (s, b, 1); + sk_write_oob (s, b+1, 1); + break; case TS_RECHO: if (o_echo.state == INACTIVE || o_echo.state == REALLY_INACTIVE) { o_echo.state = REQUESTED; @@ -753,23 +624,29 @@ static void telnet_special (Telnet_Special code) { case TS_PING: if (o_they_sga.state == ACTIVE) { b[1] = NOP; - s_write (b, 2); + sk_write(s, b, 2); } break; } } -static SOCKET telnet_socket(void) { return s; } +static Socket telnet_socket(void) { return s; } static int telnet_sendok(void) { return 1; } +static int telnet_ldisc(int option) { + if (option == LD_ECHO) return echoing; + if (option == LD_EDIT) return editing; + return FALSE; +} + Backend telnet_backend = { telnet_init, - telnet_msg, telnet_send, telnet_size, telnet_special, telnet_socket, telnet_sendok, + telnet_ldisc, 23 };