/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2009, Daniel Stenberg, , et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at http://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * * $Id: telnet.c,v 1.114 2009-04-21 11:46:17 yangtse Exp $ ***************************************************************************/ #include "setup.h" #ifndef CURL_DISABLE_TELNET /* -- WIN32 approved -- */ #include #include #include #include #include #if defined(WIN32) #include #include #else #ifdef HAVE_SYS_SOCKET_H #include #endif #include #ifdef HAVE_SYS_TIME_H #include #endif #ifdef HAVE_UNISTD_H #include #endif #include #ifdef HAVE_ARPA_INET_H #include #endif #ifdef HAVE_NET_IF_H #include #endif #ifdef HAVE_SYS_IOCTL_H #include #endif #ifdef HAVE_SYS_PARAM_H #include #endif #endif /* WIN32 */ #include "urldata.h" #include #include "transfer.h" #include "sendf.h" #include "telnet.h" #include "connect.h" #define _MPRINTF_REPLACE /* use our functions only */ #include #define TELOPTS #define TELCMDS #include "arpa_telnet.h" #include "curl_memory.h" #include "select.h" #include "strequal.h" #include "rawstr.h" /* The last #include file should be: */ #include "memdebug.h" #define SUBBUFSIZE 512 #define CURL_SB_CLEAR(x) x->subpointer = x->subbuffer; #define CURL_SB_TERM(x) { x->subend = x->subpointer; CURL_SB_CLEAR(x); } #define CURL_SB_ACCUM(x,c) \ if(x->subpointer < (x->subbuffer+sizeof x->subbuffer)) { \ *x->subpointer++ = (c); \ } #define CURL_SB_GET(x) ((*x->subpointer++)&0xff) #define CURL_SB_PEEK(x) ((*x->subpointer)&0xff) #define CURL_SB_EOF(x) (x->subpointer >= x->subend) #define CURL_SB_LEN(x) (x->subend - x->subpointer) #ifdef CURL_DISABLE_VERBOSE_STRINGS #define printoption(a,b,c,d) do { } while(0) #endif #ifdef USE_WINSOCK typedef FARPROC WSOCK2_FUNC; static CURLcode check_wsock2 ( struct SessionHandle *data ); #endif static CURLcode telrcv(struct connectdata *, const unsigned char *inbuf, /* Data received from socket */ ssize_t count); /* Number of bytes received */ #ifndef CURL_DISABLE_VERBOSE_STRINGS static void printoption(struct SessionHandle *data, const char *direction, int cmd, int option); #endif static void negotiate(struct connectdata *); static void send_negotiation(struct connectdata *, int cmd, int option); static void set_local_option(struct connectdata *, int cmd, int option); static void set_remote_option(struct connectdata *, int cmd, int option); static void printsub(struct SessionHandle *data, int direction, unsigned char *pointer, size_t length); static void suboption(struct connectdata *); static CURLcode telnet_do(struct connectdata *conn, bool *done); static CURLcode telnet_done(struct connectdata *conn, CURLcode, bool premature); /* For negotiation compliant to RFC 1143 */ #define CURL_NO 0 #define CURL_YES 1 #define CURL_WANTYES 2 #define CURL_WANTNO 3 #define CURL_EMPTY 0 #define CURL_OPPOSITE 1 /* * Telnet receiver states for fsm */ typedef enum { CURL_TS_DATA = 0, CURL_TS_IAC, CURL_TS_WILL, CURL_TS_WONT, CURL_TS_DO, CURL_TS_DONT, CURL_TS_CR, CURL_TS_SB, /* sub-option collection */ CURL_TS_SE /* looking for sub-option end */ } TelnetReceive; struct TELNET { int please_negotiate; int already_negotiated; int us[256]; int usq[256]; int us_preferred[256]; int him[256]; int himq[256]; int him_preferred[256]; char subopt_ttype[32]; /* Set with suboption TTYPE */ char subopt_xdisploc[128]; /* Set with suboption XDISPLOC */ struct curl_slist *telnet_vars; /* Environment variables */ /* suboptions */ unsigned char subbuffer[SUBBUFSIZE]; unsigned char *subpointer, *subend; /* buffer for sub-options */ TelnetReceive telrcv_state; }; /* * TELNET protocol handler. */ const struct Curl_handler Curl_handler_telnet = { "TELNET", /* scheme */ ZERO_NULL, /* setup_connection */ telnet_do, /* do_it */ telnet_done, /* done */ ZERO_NULL, /* do_more */ ZERO_NULL, /* connect_it */ ZERO_NULL, /* connecting */ ZERO_NULL, /* doing */ ZERO_NULL, /* proto_getsock */ ZERO_NULL, /* doing_getsock */ ZERO_NULL, /* perform_getsock */ ZERO_NULL, /* disconnect */ PORT_TELNET, /* defport */ PROT_TELNET /* protocol */ }; #ifdef USE_WINSOCK static CURLcode check_wsock2 ( struct SessionHandle *data ) { int err; WORD wVersionRequested; WSADATA wsaData; DEBUGASSERT(data); /* telnet requires at least WinSock 2.0 so ask for it. */ wVersionRequested = MAKEWORD(2, 0); err = WSAStartup(wVersionRequested, &wsaData); /* We must've called this once already, so this call */ /* should always succeed. But, just in case... */ if(err != 0) { failf(data,"WSAStartup failed (%d)",err); return CURLE_FAILED_INIT; } /* We have to have a WSACleanup call for every successful */ /* WSAStartup call. */ WSACleanup(); /* Check that our version is supported */ if(LOBYTE(wsaData.wVersion) != LOBYTE(wVersionRequested) || HIBYTE(wsaData.wVersion) != HIBYTE(wVersionRequested)) { /* Our version isn't supported */ failf(data,"insufficient winsock version to support " "telnet"); return CURLE_FAILED_INIT; } /* Our version is supported */ return CURLE_OK; } #endif static CURLcode init_telnet(struct connectdata *conn) { struct TELNET *tn; tn = calloc(1, sizeof(struct TELNET)); if(!tn) return CURLE_OUT_OF_MEMORY; conn->data->state.proto.telnet = (void *)tn; /* make us known */ tn->telrcv_state = CURL_TS_DATA; /* Init suboptions */ CURL_SB_CLEAR(tn); /* Set the options we want by default */ tn->us_preferred[CURL_TELOPT_BINARY] = CURL_YES; tn->us_preferred[CURL_TELOPT_SGA] = CURL_YES; tn->him_preferred[CURL_TELOPT_BINARY] = CURL_YES; tn->him_preferred[CURL_TELOPT_SGA] = CURL_YES; return CURLE_OK; } static void negotiate(struct connectdata *conn) { int i; struct TELNET *tn = (struct TELNET *) conn->data->state.proto.telnet; for(i = 0;i < CURL_NTELOPTS;i++) { if(tn->us_preferred[i] == CURL_YES) set_local_option(conn, i, CURL_YES); if(tn->him_preferred[i] == CURL_YES) set_remote_option(conn, i, CURL_YES); } } #ifndef CURL_DISABLE_VERBOSE_STRINGS static void printoption(struct SessionHandle *data, const char *direction, int cmd, int option) { const char *fmt; const char *opt; if(data->set.verbose) { if(cmd == CURL_IAC) { if(CURL_TELCMD_OK(option)) infof(data, "%s IAC %s\n", direction, CURL_TELCMD(option)); else infof(data, "%s IAC %d\n", direction, option); } else { fmt = (cmd == CURL_WILL) ? "WILL" : (cmd == CURL_WONT) ? "WONT" : (cmd == CURL_DO) ? "DO" : (cmd == CURL_DONT) ? "DONT" : 0; if(fmt) { if(CURL_TELOPT_OK(option)) opt = CURL_TELOPT(option); else if(option == CURL_TELOPT_EXOPL) opt = "EXOPL"; else opt = NULL; if(opt) infof(data, "%s %s %s\n", direction, fmt, opt); else infof(data, "%s %s %d\n", direction, fmt, option); } else infof(data, "%s %d %d\n", direction, cmd, option); } } } #endif static void send_negotiation(struct connectdata *conn, int cmd, int option) { unsigned char buf[3]; ssize_t bytes_written; int err; struct SessionHandle *data = conn->data; buf[0] = CURL_IAC; buf[1] = (unsigned char)cmd; buf[2] = (unsigned char)option; bytes_written = swrite(conn->sock[FIRSTSOCKET], buf, 3); if(bytes_written < 0) { err = SOCKERRNO; failf(data,"Sending data failed (%d)",err); } printoption(conn->data, "SENT", cmd, option); } static void set_remote_option(struct connectdata *conn, int option, int newstate) { struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet; if(newstate == CURL_YES) { switch(tn->him[option]) { case CURL_NO: tn->him[option] = CURL_WANTYES; send_negotiation(conn, CURL_DO, option); break; case CURL_YES: /* Already enabled */ break; case CURL_WANTNO: switch(tn->himq[option]) { case CURL_EMPTY: /* Already negotiating for CURL_YES, queue the request */ tn->himq[option] = CURL_OPPOSITE; break; case CURL_OPPOSITE: /* Error: already queued an enable request */ break; } break; case CURL_WANTYES: switch(tn->himq[option]) { case CURL_EMPTY: /* Error: already negotiating for enable */ break; case CURL_OPPOSITE: tn->himq[option] = CURL_EMPTY; break; } break; } } else /* NO */ { switch(tn->him[option]) { case CURL_NO: /* Already disabled */ break; case CURL_YES: tn->him[option] = CURL_WANTNO; send_negotiation(conn, CURL_DONT, option); break; case CURL_WANTNO: switch(tn->himq[option]) { case CURL_EMPTY: /* Already negotiating for NO */ break; case CURL_OPPOSITE: tn->himq[option] = CURL_EMPTY; break; } break; case CURL_WANTYES: switch(tn->himq[option]) { case CURL_EMPTY: tn->himq[option] = CURL_OPPOSITE; break; case CURL_OPPOSITE: break; } break; } } } static void rec_will(struct connectdata *conn, int option) { struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet; switch(tn->him[option]) { case CURL_NO: if(tn->him_preferred[option] == CURL_YES) { tn->him[option] = CURL_YES; send_negotiation(conn, CURL_DO, option); } else { send_negotiation(conn, CURL_DONT, option); } break; case CURL_YES: /* Already enabled */ break; case CURL_WANTNO: switch(tn->himq[option]) { case CURL_EMPTY: /* Error: DONT answered by WILL */ tn->him[option] = CURL_NO; break; case CURL_OPPOSITE: /* Error: DONT answered by WILL */ tn->him[option] = CURL_YES; tn->himq[option] = CURL_EMPTY; break; } break; case CURL_WANTYES: switch(tn->himq[option]) { case CURL_EMPTY: tn->him[option] = CURL_YES; break; case CURL_OPPOSITE: tn->him[option] = CURL_WANTNO; tn->himq[option] = CURL_EMPTY; send_negotiation(conn, CURL_DONT, option); break; } break; } } static void rec_wont(struct connectdata *conn, int option) { struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet; switch(tn->him[option]) { case CURL_NO: /* Already disabled */ break; case CURL_YES: tn->him[option] = CURL_NO; send_negotiation(conn, CURL_DONT, option); break; case CURL_WANTNO: switch(tn->himq[option]) { case CURL_EMPTY: tn->him[option] = CURL_NO; break; case CURL_OPPOSITE: tn->him[option] = CURL_WANTYES; tn->himq[option] = CURL_EMPTY; send_negotiation(conn, CURL_DO, option); break; } break; case CURL_WANTYES: switch(tn->himq[option]) { case CURL_EMPTY: tn->him[option] = CURL_NO; break; case CURL_OPPOSITE: tn->him[option] = CURL_NO; tn->himq[option] = CURL_EMPTY; break; } break; } } static void set_local_option(struct connectdata *conn, int option, int newstate) { struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet; if(newstate == CURL_YES) { switch(tn->us[option]) { case CURL_NO: tn->us[option] = CURL_WANTYES; send_negotiation(conn, CURL_WILL, option); break; case CURL_YES: /* Already enabled */ break; case CURL_WANTNO: switch(tn->usq[option]) { case CURL_EMPTY: /* Already negotiating for CURL_YES, queue the request */ tn->usq[option] = CURL_OPPOSITE; break; case CURL_OPPOSITE: /* Error: already queued an enable request */ break; } break; case CURL_WANTYES: switch(tn->usq[option]) { case CURL_EMPTY: /* Error: already negotiating for enable */ break; case CURL_OPPOSITE: tn->usq[option] = CURL_EMPTY; break; } break; } } else /* NO */ { switch(tn->us[option]) { case CURL_NO: /* Already disabled */ break; case CURL_YES: tn->us[option] = CURL_WANTNO; send_negotiation(conn, CURL_WONT, option); break; case CURL_WANTNO: switch(tn->usq[option]) { case CURL_EMPTY: /* Already negotiating for NO */ break; case CURL_OPPOSITE: tn->usq[option] = CURL_EMPTY; break; } break; case CURL_WANTYES: switch(tn->usq[option]) { case CURL_EMPTY: tn->usq[option] = CURL_OPPOSITE; break; case CURL_OPPOSITE: break; } break; } } } static void rec_do(struct connectdata *conn, int option) { struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet; switch(tn->us[option]) { case CURL_NO: if(tn->us_preferred[option] == CURL_YES) { tn->us[option] = CURL_YES; send_negotiation(conn, CURL_WILL, option); } else { send_negotiation(conn, CURL_WONT, option); } break; case CURL_YES: /* Already enabled */ break; case CURL_WANTNO: switch(tn->usq[option]) { case CURL_EMPTY: /* Error: DONT answered by WILL */ tn->us[option] = CURL_NO; break; case CURL_OPPOSITE: /* Error: DONT answered by WILL */ tn->us[option] = CURL_YES; tn->usq[option] = CURL_EMPTY; break; } break; case CURL_WANTYES: switch(tn->usq[option]) { case CURL_EMPTY: tn->us[option] = CURL_YES; break; case CURL_OPPOSITE: tn->us[option] = CURL_WANTNO; tn->himq[option] = CURL_EMPTY; send_negotiation(conn, CURL_WONT, option); break; } break; } } static void rec_dont(struct connectdata *conn, int option) { struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet; switch(tn->us[option]) { case CURL_NO: /* Already disabled */ break; case CURL_YES: tn->us[option] = CURL_NO; send_negotiation(conn, CURL_WONT, option); break; case CURL_WANTNO: switch(tn->usq[option]) { case CURL_EMPTY: tn->us[option] = CURL_NO; break; case CURL_OPPOSITE: tn->us[option] = CURL_WANTYES; tn->usq[option] = CURL_EMPTY; send_negotiation(conn, CURL_WILL, option); break; } break; case CURL_WANTYES: switch(tn->usq[option]) { case CURL_EMPTY: tn->us[option] = CURL_NO; break; case CURL_OPPOSITE: tn->us[option] = CURL_NO; tn->usq[option] = CURL_EMPTY; break; } break; } } static void printsub(struct SessionHandle *data, int direction, /* '<' or '>' */ unsigned char *pointer, /* where suboption data is */ size_t length) /* length of suboption data */ { unsigned int i = 0; if(data->set.verbose) { if(direction) { infof(data, "%s IAC SB ", (direction == '<')? "RCVD":"SENT"); if(length >= 3) { int j; i = pointer[length-2]; j = pointer[length-1]; if(i != CURL_IAC || j != CURL_SE) { infof(data, "(terminated by "); if(CURL_TELOPT_OK(i)) infof(data, "%s ", CURL_TELOPT(i)); else if(CURL_TELCMD_OK(i)) infof(data, "%s ", CURL_TELCMD(i)); else infof(data, "%d ", i); if(CURL_TELOPT_OK(j)) infof(data, "%s", CURL_TELOPT(j)); else if(CURL_TELCMD_OK(j)) infof(data, "%s", CURL_TELCMD(j)); else infof(data, "%d", j); infof(data, ", not IAC SE!) "); } } length -= 2; } if(length < 1) { infof(data, "(Empty suboption?)"); return; } if(CURL_TELOPT_OK(pointer[0])) { switch(pointer[0]) { case CURL_TELOPT_TTYPE: case CURL_TELOPT_XDISPLOC: case CURL_TELOPT_NEW_ENVIRON: infof(data, "%s", CURL_TELOPT(pointer[0])); break; default: infof(data, "%s (unsupported)", CURL_TELOPT(pointer[0])); break; } } else infof(data, "%d (unknown)", pointer[i]); switch(pointer[1]) { case CURL_TELQUAL_IS: infof(data, " IS"); break; case CURL_TELQUAL_SEND: infof(data, " SEND"); break; case CURL_TELQUAL_INFO: infof(data, " INFO/REPLY"); break; case CURL_TELQUAL_NAME: infof(data, " NAME"); break; } switch(pointer[0]) { case CURL_TELOPT_TTYPE: case CURL_TELOPT_XDISPLOC: pointer[length] = 0; infof(data, " \"%s\"", &pointer[2]); break; case CURL_TELOPT_NEW_ENVIRON: if(pointer[1] == CURL_TELQUAL_IS) { infof(data, " "); for(i = 3;i < length;i++) { switch(pointer[i]) { case CURL_NEW_ENV_VAR: infof(data, ", "); break; case CURL_NEW_ENV_VALUE: infof(data, " = "); break; default: infof(data, "%c", pointer[i]); break; } } } break; default: for (i = 2; i < length; i++) infof(data, " %.2x", pointer[i]); break; } if(direction) { infof(data, "\n"); } } } static CURLcode check_telnet_options(struct connectdata *conn) { struct curl_slist *head; char option_keyword[128]; char option_arg[256]; char *buf; struct SessionHandle *data = conn->data; struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet; /* Add the user name as an environment variable if it was given on the command line */ if(conn->bits.user_passwd) { snprintf(option_arg, sizeof(option_arg), "USER,%s", conn->user); tn->telnet_vars = curl_slist_append(tn->telnet_vars, option_arg); tn->us_preferred[CURL_TELOPT_NEW_ENVIRON] = CURL_YES; } for(head = data->set.telnet_options; head; head=head->next) { if(sscanf(head->data, "%127[^= ]%*[ =]%255s", option_keyword, option_arg) == 2) { /* Terminal type */ if(Curl_raw_equal(option_keyword, "TTYPE")) { strncpy(tn->subopt_ttype, option_arg, 31); tn->subopt_ttype[31] = 0; /* String termination */ tn->us_preferred[CURL_TELOPT_TTYPE] = CURL_YES; continue; } /* Display variable */ if(Curl_raw_equal(option_keyword, "XDISPLOC")) { strncpy(tn->subopt_xdisploc, option_arg, 127); tn->subopt_xdisploc[127] = 0; /* String termination */ tn->us_preferred[CURL_TELOPT_XDISPLOC] = CURL_YES; continue; } /* Environment variable */ if(Curl_raw_equal(option_keyword, "NEW_ENV")) { buf = strdup(option_arg); if(!buf) return CURLE_OUT_OF_MEMORY; tn->telnet_vars = curl_slist_append(tn->telnet_vars, buf); tn->us_preferred[CURL_TELOPT_NEW_ENVIRON] = CURL_YES; continue; } failf(data, "Unknown telnet option %s", head->data); return CURLE_UNKNOWN_TELNET_OPTION; } else { failf(data, "Syntax error in telnet option: %s", head->data); return CURLE_TELNET_OPTION_SYNTAX; } } return CURLE_OK; } /* * suboption() * * Look at the sub-option buffer, and try to be helpful to the other * side. */ static void suboption(struct connectdata *conn) { struct curl_slist *v; unsigned char temp[2048]; ssize_t bytes_written; size_t len; size_t tmplen; int err; char varname[128]; char varval[128]; struct SessionHandle *data = conn->data; struct TELNET *tn = (struct TELNET *)data->state.proto.telnet; printsub(data, '<', (unsigned char *)tn->subbuffer, CURL_SB_LEN(tn)+2); switch (CURL_SB_GET(tn)) { case CURL_TELOPT_TTYPE: len = strlen(tn->subopt_ttype) + 4 + 2; snprintf((char *)temp, sizeof(temp), "%c%c%c%c%s%c%c", CURL_IAC, CURL_SB, CURL_TELOPT_TTYPE, CURL_TELQUAL_IS, tn->subopt_ttype, CURL_IAC, CURL_SE); bytes_written = swrite(conn->sock[FIRSTSOCKET], temp, len); if(bytes_written < 0) { err = SOCKERRNO; failf(data,"Sending data failed (%d)",err); } printsub(data, '>', &temp[2], len-2); break; case CURL_TELOPT_XDISPLOC: len = strlen(tn->subopt_xdisploc) + 4 + 2; snprintf((char *)temp, sizeof(temp), "%c%c%c%c%s%c%c", CURL_IAC, CURL_SB, CURL_TELOPT_XDISPLOC, CURL_TELQUAL_IS, tn->subopt_xdisploc, CURL_IAC, CURL_SE); bytes_written = swrite(conn->sock[FIRSTSOCKET], temp, len); if(bytes_written < 0) { err = SOCKERRNO; failf(data,"Sending data failed (%d)",err); } printsub(data, '>', &temp[2], len-2); break; case CURL_TELOPT_NEW_ENVIRON: snprintf((char *)temp, sizeof(temp), "%c%c%c%c", CURL_IAC, CURL_SB, CURL_TELOPT_NEW_ENVIRON, CURL_TELQUAL_IS); len = 4; for(v = tn->telnet_vars;v;v = v->next) { tmplen = (strlen(v->data) + 1); /* Add the variable only if it fits */ if(len + tmplen < (int)sizeof(temp)-6) { sscanf(v->data, "%127[^,],%127s", varname, varval); snprintf((char *)&temp[len], sizeof(temp) - len, "%c%s%c%s", CURL_NEW_ENV_VAR, varname, CURL_NEW_ENV_VALUE, varval); len += tmplen; } } snprintf((char *)&temp[len], sizeof(temp) - len, "%c%c", CURL_IAC, CURL_SE); len += 2; bytes_written = swrite(conn->sock[FIRSTSOCKET], temp, len); if(bytes_written < 0) { err = SOCKERRNO; failf(data,"Sending data failed (%d)",err); } printsub(data, '>', &temp[2], len-2); break; } return; } static CURLcode telrcv(struct connectdata *conn, const unsigned char *inbuf, /* Data received from socket */ ssize_t count) /* Number of bytes received */ { unsigned char c; CURLcode result; int in = 0; int startwrite=-1; struct SessionHandle *data = conn->data; struct TELNET *tn = (struct TELNET *)data->state.proto.telnet; #define startskipping() \ if(startwrite >= 0) { \ result = Curl_client_write(conn, \ CLIENTWRITE_BODY, \ (char *)&inbuf[startwrite], \ in-startwrite); \ if(result != CURLE_OK) \ return result; \ } \ startwrite = -1 #define writebyte() \ if(startwrite < 0) \ startwrite = in #define bufferflush() startskipping() while(count--) { c = inbuf[in]; /*infof(data,"In rcv state %d char %d\n", tn->telrcv_state, c);*/ switch (tn->telrcv_state) { case CURL_TS_CR: tn->telrcv_state = CURL_TS_DATA; if(c == '\0') { startskipping(); break; /* Ignore \0 after CR */ } writebyte(); break; case CURL_TS_DATA: if(c == CURL_IAC) { tn->telrcv_state = CURL_TS_IAC; startskipping(); break; } else if(c == '\r') { tn->telrcv_state = CURL_TS_CR; } writebyte(); break; case CURL_TS_IAC: process_iac: DEBUGASSERT(startwrite < 0); switch (c) { case CURL_WILL: tn->telrcv_state = CURL_TS_WILL; break; case CURL_WONT: tn->telrcv_state = CURL_TS_WONT; break; case CURL_DO: tn->telrcv_state = CURL_TS_DO; break; case CURL_DONT: tn->telrcv_state = CURL_TS_DONT; break; case CURL_SB: CURL_SB_CLEAR(tn); tn->telrcv_state = CURL_TS_SB; break; case CURL_IAC: tn->telrcv_state = CURL_TS_DATA; writebyte(); break; case CURL_DM: case CURL_NOP: case CURL_GA: default: tn->telrcv_state = CURL_TS_DATA; printoption(data, "RCVD", CURL_IAC, c); break; } break; case CURL_TS_WILL: printoption(data, "RCVD", CURL_WILL, c); tn->please_negotiate = 1; rec_will(conn, c); tn->telrcv_state = CURL_TS_DATA; break; case CURL_TS_WONT: printoption(data, "RCVD", CURL_WONT, c); tn->please_negotiate = 1; rec_wont(conn, c); tn->telrcv_state = CURL_TS_DATA; break; case CURL_TS_DO: printoption(data, "RCVD", CURL_DO, c); tn->please_negotiate = 1; rec_do(conn, c); tn->telrcv_state = CURL_TS_DATA; break; case CURL_TS_DONT: printoption(data, "RCVD", CURL_DONT, c); tn->please_negotiate = 1; rec_dont(conn, c); tn->telrcv_state = CURL_TS_DATA; break; case CURL_TS_SB: if(c == CURL_IAC) { tn->telrcv_state = CURL_TS_SE; } else { CURL_SB_ACCUM(tn,c); } break; case CURL_TS_SE: if(c != CURL_SE) { if(c != CURL_IAC) { /* * This is an error. We only expect to get "IAC IAC" or "IAC SE". * Several things may have happend. An IAC was not doubled, the * IAC SE was left off, or another option got inserted into the * suboption are all possibilities. If we assume that the IAC was * not doubled, and really the IAC SE was left off, we could get * into an infinate loop here. So, instead, we terminate the * suboption, and process the partial suboption if we can. */ CURL_SB_ACCUM(tn, CURL_IAC); CURL_SB_ACCUM(tn, c); tn->subpointer -= 2; CURL_SB_TERM(tn); printoption(data, "In SUBOPTION processing, RCVD", CURL_IAC, c); suboption(conn); /* handle sub-option */ tn->telrcv_state = CURL_TS_IAC; goto process_iac; } CURL_SB_ACCUM(tn,c); tn->telrcv_state = CURL_TS_SB; } else { CURL_SB_ACCUM(tn, CURL_IAC); CURL_SB_ACCUM(tn, CURL_SE); tn->subpointer -= 2; CURL_SB_TERM(tn); suboption(conn); /* handle sub-option */ tn->telrcv_state = CURL_TS_DATA; } break; } ++in; } bufferflush(); return CURLE_OK; } /* Escape and send a telnet data block */ /* TODO: write large chunks of data instead of one byte at a time */ static CURLcode send_telnet_data(struct connectdata *conn, char *buffer, ssize_t nread) { unsigned char outbuf[2]; ssize_t bytes_written, total_written; int out_count; CURLcode rc = CURLE_OK; while(rc == CURLE_OK && nread--) { outbuf[0] = *buffer++; out_count = 1; if(outbuf[0] == CURL_IAC) outbuf[out_count++] = CURL_IAC; total_written = 0; do { /* Make sure socket is writable to avoid EWOULDBLOCK condition */ struct pollfd pfd[1]; pfd[0].fd = conn->sock[FIRSTSOCKET]; pfd[0].events = POLLOUT; switch (Curl_poll(pfd, 1, -1)) { case -1: /* error, abort writing */ case 0: /* timeout (will never happen) */ rc = CURLE_SEND_ERROR; break; default: /* write! */ bytes_written = 0; rc = Curl_write(conn, conn->sock[FIRSTSOCKET], outbuf+total_written, out_count-total_written, &bytes_written); total_written += bytes_written; break; } /* handle partial write */ } while (rc == CURLE_OK && total_written < out_count); } return rc; } static CURLcode telnet_done(struct connectdata *conn, CURLcode status, bool premature) { struct TELNET *tn = (struct TELNET *)conn->data->state.proto.telnet; (void)status; /* unused */ (void)premature; /* not used */ curl_slist_free_all(tn->telnet_vars); free(conn->data->state.proto.telnet); conn->data->state.proto.telnet = NULL; return CURLE_OK; } static CURLcode telnet_do(struct connectdata *conn, bool *done) { CURLcode code; struct SessionHandle *data = conn->data; curl_socket_t sockfd = conn->sock[FIRSTSOCKET]; #ifdef USE_WINSOCK HMODULE wsock2; WSOCK2_FUNC close_event_func; WSOCK2_FUNC create_event_func; WSOCK2_FUNC event_select_func; WSOCK2_FUNC enum_netevents_func; WSAEVENT event_handle; WSANETWORKEVENTS events; HANDLE stdin_handle; HANDLE objs[2]; DWORD obj_count; DWORD wait_timeout; DWORD waitret; DWORD readfile_read; int err; #else int interval_ms; struct pollfd pfd[2]; #endif int ret; ssize_t nread; struct timeval now; bool keepon = TRUE; char *buf = data->state.buffer; struct TELNET *tn; *done = TRUE; /* unconditionally */ code = init_telnet(conn); if(code) return code; tn = (struct TELNET *)data->state.proto.telnet; code = check_telnet_options(conn); if(code) return code; #ifdef USE_WINSOCK /* ** This functionality only works with WinSock >= 2.0. So, ** make sure have it. */ code = check_wsock2(data); if(code) return code; /* OK, so we have WinSock 2.0. We need to dynamically */ /* load ws2_32.dll and get the function pointers we need. */ wsock2 = LoadLibrary("WS2_32.DLL"); if(wsock2 == NULL) { failf(data,"failed to load WS2_32.DLL (%d)", ERRNO); return CURLE_FAILED_INIT; } /* Grab a pointer to WSACreateEvent */ create_event_func = GetProcAddress(wsock2,"WSACreateEvent"); if(create_event_func == NULL) { failf(data,"failed to find WSACreateEvent function (%d)", ERRNO); FreeLibrary(wsock2); return CURLE_FAILED_INIT; } /* And WSACloseEvent */ close_event_func = GetProcAddress(wsock2,"WSACloseEvent"); if(close_event_func == NULL) { failf(data,"failed to find WSACloseEvent function (%d)", ERRNO); FreeLibrary(wsock2); return CURLE_FAILED_INIT; } /* And WSAEventSelect */ event_select_func = GetProcAddress(wsock2,"WSAEventSelect"); if(event_select_func == NULL) { failf(data,"failed to find WSAEventSelect function (%d)", ERRNO); FreeLibrary(wsock2); return CURLE_FAILED_INIT; } /* And WSAEnumNetworkEvents */ enum_netevents_func = GetProcAddress(wsock2,"WSAEnumNetworkEvents"); if(enum_netevents_func == NULL) { failf(data,"failed to find WSAEnumNetworkEvents function (%d)", ERRNO); FreeLibrary(wsock2); return CURLE_FAILED_INIT; } /* We want to wait for both stdin and the socket. Since ** the select() function in winsock only works on sockets ** we have to use the WaitForMultipleObjects() call. */ /* First, create a sockets event object */ event_handle = (WSAEVENT)create_event_func(); if(event_handle == WSA_INVALID_EVENT) { failf(data,"WSACreateEvent failed (%d)", SOCKERRNO); FreeLibrary(wsock2); return CURLE_FAILED_INIT; } /* The get the Windows file handle for stdin */ stdin_handle = GetStdHandle(STD_INPUT_HANDLE); /* Create the list of objects to wait for */ objs[0] = event_handle; objs[1] = stdin_handle; /* Tell winsock what events we want to listen to */ if(event_select_func(sockfd, event_handle, FD_READ|FD_CLOSE) == SOCKET_ERROR) { close_event_func(event_handle); FreeLibrary(wsock2); return CURLE_OK; } /* If stdin_handle is a pipe, use PeekNamedPipe() method to check it, else use the old WaitForMultipleObjects() way */ if(GetFileType(stdin_handle) == FILE_TYPE_PIPE) { /* Don't wait for stdin_handle, just wait for event_handle */ obj_count = 1; /* Check stdin_handle per 100 milliseconds */ wait_timeout = 100; } else { obj_count = 2; wait_timeout = 1000; } /* Keep on listening and act on events */ while(keepon) { waitret = WaitForMultipleObjects(obj_count, objs, FALSE, wait_timeout); switch(waitret) { case WAIT_TIMEOUT: { while(1) { if(!PeekNamedPipe(stdin_handle, NULL, 0, NULL, &readfile_read, NULL)) { keepon = FALSE; code = CURLE_READ_ERROR; break; } if(!readfile_read) break; if(!ReadFile(stdin_handle, buf, sizeof(data->state.buffer), &readfile_read, NULL)) { keepon = FALSE; code = CURLE_READ_ERROR; break; } code = send_telnet_data(conn, buf, readfile_read); if(code) { keepon = FALSE; break; } } } break; case WAIT_OBJECT_0 + 1: { if(!ReadFile(stdin_handle, buf, sizeof(data->state.buffer), &readfile_read, NULL)) { keepon = FALSE; code = CURLE_READ_ERROR; break; } code = send_telnet_data(conn, buf, readfile_read); if(code) { keepon = FALSE; break; } } break; case WAIT_OBJECT_0: if(SOCKET_ERROR == enum_netevents_func(sockfd, event_handle, &events)) { if((err = SOCKERRNO) != EINPROGRESS) { infof(data,"WSAEnumNetworkEvents failed (%d)", err); keepon = FALSE; code = CURLE_READ_ERROR; } break; } if(events.lNetworkEvents & FD_READ) { /* read data from network */ ret = Curl_read(conn, sockfd, buf, BUFSIZE - 1, &nread); /* returned sub-zero, this would've blocked. Loop again */ if(ret < 0) break; /* returned not-zero, this an error */ else if(ret) { keepon = FALSE; code = (CURLcode)ret; break; } /* returned zero but actually received 0 or less here, the server closed the connection and we bail out */ else if(nread <= 0) { keepon = FALSE; break; } code = telrcv(conn, (unsigned char *)buf, nread); if(code) { keepon = FALSE; break; } fflush(stdout); /* Negotiate if the peer has started negotiating, otherwise don't. We don't want to speak telnet with non-telnet servers, like POP or SMTP. */ if(tn->please_negotiate && !tn->already_negotiated) { negotiate(conn); tn->already_negotiated = 1; } } if(events.lNetworkEvents & FD_CLOSE) { keepon = FALSE; } break; } if(data->set.timeout) { now = Curl_tvnow(); if(Curl_tvdiff(now, conn->created) >= data->set.timeout) { failf(data, "Time-out"); code = CURLE_OPERATION_TIMEDOUT; keepon = FALSE; } } } /* We called WSACreateEvent, so call WSACloseEvent */ if(close_event_func(event_handle) == FALSE) { infof(data,"WSACloseEvent failed (%d)", SOCKERRNO); } /* "Forget" pointers into the library we're about to free */ create_event_func = NULL; close_event_func = NULL; event_select_func = NULL; enum_netevents_func = NULL; /* We called LoadLibrary, so call FreeLibrary */ if(!FreeLibrary(wsock2)) infof(data,"FreeLibrary(wsock2) failed (%d)", ERRNO); #else pfd[0].fd = sockfd; pfd[0].events = POLLIN; pfd[1].fd = 0; pfd[1].events = POLLIN; interval_ms = 1 * 1000; while(keepon) { switch (Curl_poll(pfd, 2, interval_ms)) { case -1: /* error, stop reading */ keepon = FALSE; continue; case 0: /* timeout */ break; default: /* read! */ if(pfd[1].revents & POLLIN) { /* read from stdin */ nread = read(0, buf, 255); code = send_telnet_data(conn, buf, nread); if(code) { keepon = FALSE; break; } } if(pfd[0].revents & POLLIN) { /* read data from network */ ret = Curl_read(conn, sockfd, buf, BUFSIZE - 1, &nread); /* returned sub-zero, this would've blocked. Loop again */ if(ret < 0) break; /* returned not-zero, this an error */ else if(ret) { keepon = FALSE; code = (CURLcode)ret; break; } /* returned zero but actually received 0 or less here, the server closed the connection and we bail out */ else if(nread <= 0) { keepon = FALSE; break; } code = telrcv(conn, (unsigned char *)buf, nread); if(code) { keepon = FALSE; break; } /* Negotiate if the peer has started negotiating, otherwise don't. We don't want to speak telnet with non-telnet servers, like POP or SMTP. */ if(tn->please_negotiate && !tn->already_negotiated) { negotiate(conn); tn->already_negotiated = 1; } } } if(data->set.timeout) { now = Curl_tvnow(); if(Curl_tvdiff(now, conn->created) >= data->set.timeout) { failf(data, "Time-out"); code = CURLE_OPERATION_TIMEDOUT; keepon = FALSE; } } } #endif /* mark this as "no further transfer wanted" */ Curl_setup_transfer(conn, -1, -1, FALSE, NULL, -1, NULL); return code; } #endif