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- #include <stdio.h>
- #include "global.h"
- #include "mbuf.h"
- #include "socket.h"
- #include "telnet.h"
- #include "session.h"
- #include "proc.h"
- #include "tty.h"
- #include "commands.h"
- #include "netuser.h"
- #include "config.h"
-
- #define CTLZ 26
- #undef DEBUG 1
-
- int Refuse_echo = 0;
- int Tn_cr_mode = 0; /* if true turn <cr> to <cr-nul> */
-
- #ifdef DEBUG
- char *T_options[] = {
- "Transmit Binary",
- "Echo",
- "",
- "Suppress Go Ahead",
- "",
- "Status",
- "Timing Mark"
- };
- #endif
-
- #ifdef MAILBOX || CHATNODE
- /* Execute BBS command */
- int dobbschat(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- struct session *sp;
- struct sockaddr_in fsocket;
-
- /* Allocate a session descriptor */
- if((sp = newsession(
- strncmp(argv[0],"c",1)
- ? "Local BBS" : "Local ChatNode",
- TELNET)) == NULLSESSION){
- tprintf("Too many sessions\n");
- return 1;
- }
- fsocket.sin_family = AF_INET;
- if(argc < 3)
- fsocket.sin_port = strncmp(argv[0],"c",1)
- ? IPPORT_TELNET : IPPORT_CHATNODE;
- else
- fsocket.sin_port = atoi(argv[2]);
-
- if((fsocket.sin_addr.s_addr = Ip_addr) == 0){
- tprintf(Badhost,sp->name);
- keywait(NULLCHAR,1);
- freesession(sp);
- return 1;
- }
- if((sp->s = socket(AF_INET,SOCK_STREAM,0)) == -1){
- tprintf("Can't create socket\n");
- keywait(NULLCHAR,1);
- freesession(sp);
- return 1;
- }
- return tel_connect(sp,(char *)&fsocket,SOCKSIZE);
- }
- #endif
-
- /* Execute user telnet command */
- int dotelnet(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- struct session *sp;
- struct sockaddr_in fsocket;
-
- /* Allocate a session descriptor */
- if((sp = newsession(argv[1],TELNET)) == NULLSESSION){
- tprintf("Too many sessions\n");
- freeargs(argc,argv);
- return 1;
- }
- fsocket.sin_family = AF_INET;
- if(argc < 3)
- fsocket.sin_port = strncmp(argv[0]+1,"t",1)
- ? IPPORT_TELNET : IPPORT_TTYLINK;
- else
- fsocket.sin_port = atoi(argv[2]);
-
- freeargs(argc,argv);
- tprintf("Resolving %s... ",sp->name);
- if((fsocket.sin_addr.s_addr = resolve(sp->name)) == 0){
- tprintf(Badhost,sp->name);
- keywait(NULLCHAR,1);
- freesession(sp);
- return 1;
- }
- if((sp->s = socket(AF_INET,SOCK_STREAM,0)) == -1){
- tprintf("Can't create socket\n");
- keywait(NULLCHAR,1);
- freesession(sp);
- return 1;
- }
- return tel_connect(sp,(char *)&fsocket,SOCKSIZE);
- }
- /* Generic interactive connect routine, used by Telnet, AX.25, NET/ROM */
- int
- tel_connect(sp,fsocket,len)
- struct session *sp;
- char *fsocket;
- int len;
- {
- unsigned int index;
- struct telnet tn;
-
- index = sp - Sessions;
- memset((char *)&tn,0,sizeof(tn));
- tn.eolmode = Tn_cr_mode;
- tn.session = sp; /* Upward pointer */
- sp->cb.telnet = &tn; /* Downward pointer */
-
- tprintf("Trying %s...\n",psocket((struct sockaddr *)fsocket));
- if(connect(sp->s,fsocket,len) == -1){
- tprintf("%s session %u failed: %s errno %d\n",
- Sestypes[sp->type], index, sockerr(sp->s),errno);
-
- keywait(NULLCHAR,1);
- freesession(sp);
- return 1;
- }
- tprintf("%s session ",Sestypes[sp->type]);
- tprintf("%u connected to %s\n",index,sp->name);
- tnrecv(&tn);
- return 0;
- }
-
- extern int EightBit;
-
- /* Telnet input routine, common to both telnet and ttylink */
- void
- tnrecv(tn)
- struct telnet *tn;
- {
- int c,s,index;
- struct session *sp;
- char *cp;
-
- sp = tn->session;
- s = sp->s;
-
- /* We run both the network and local sockets in transparent mode
- * because we have to do our own eol mapping
- */
- seteol(s,"");
- seteol(Curproc->input,"");
- seteol(Curproc->output,"");
-
- /* Read real keystrokes from the keyboard */
- sp->ttystate.crnl = 0;
-
- /* Make sure network output gets flushed appropriately */
- switch(sp->type){
- case AX25TNC:
- case NRSESSION:
- setflush(s,'\r');
- break;
- case TELNET:
- setflush(s,'\n');
- break;
- }
-
- index = sp - Sessions;
-
- /* Fork off the transmit process */
- sp->proc1 = newproc("tel_out",1024,tel_output,0,tn,NULL);
-
- /* Process input on the connection */
- while((c = recvchar(s)) != -1){
- if(c != IAC){
- /* Ordinary character */
- if(!EightBit)
- if(!tn->remote[TN_TRANSMIT_BINARY])
- c &= 0x7f;
-
- tputc((char)c);
- /* AX25 and NET/ROM sessions map cr to cr/nl on input */
- if(c == '\r' && (sp->type == AX25TNC || sp->type == NRSESSION))
- tputc('\n');
- continue;
- }
- /* IAC received, get command sequence */
- c = recvchar(s);
- switch(c){
- case WILL:
- willopt(tn,recvchar(s));
- break;
- case WONT:
- wontopt(tn,recvchar(s));
- break;
- case DO:
- doopt(tn,recvchar(s));
- break;
- case DONT:
- dontopt(tn,recvchar(s));
- break;
- case IAC: /* Escaped IAC */
- tputc(IAC);
- break;
- }
- }
- quit: /* A close was received from the remote host.
- * Notify the user, kill the output task and wait for a response
- * from the user before freeing the session.
- */
- cp = sockerr(s);
- tprintf("%s session %u", Sestypes[sp->type],index);
- tprintf(" closed: %s\n", cp != NULLCHAR ? cp : "EOF");
- killproc(sp->proc1);
- sp->proc1 = NULLPROC;
- close_s(sp->s);
- sp->s = -1;
- keywait(NULLCHAR,1);
- freesession(sp);
- }
-
- /* User telnet output task, started by user telnet command */
- void
- tel_output(unused,tn1,p)
- int unused;
- void *tn1;
- void *p;
- {
- struct session *sp;
- int c;
- struct telnet *tn;
-
- tn = (struct telnet *)tn1;
- sp = tn->session;
-
- /* Send whatever's typed on the terminal */
- while((c = recvchar(sp->input)) != EOF){
- usputc(sp->s,(char)c);
- /* Standard telnet calls for cr to map to cr/lf on output.
- * The optional mode maps to cr-nul.
- */
- if(c == '\r' && sp->type == TELNET){
- if(tn->eolmode == 0)
- usputc(sp->s,'\n');
- else
- usputc(sp->s,'\0');
- }
- if(tn->remote[TN_ECHO])
- usflush(sp->s);
- }
- /* Make sure our parent doesn't try to kill us after we exit */
- sp->proc1 = NULLPROC;
- }
- int
- doecho(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- if(argc < 2){
- if(Refuse_echo)
- tprintf("Refuse\n");
- else
- tprintf("Accept\n");
- } else {
- if(argv[1][0] == 'r')
- Refuse_echo = 1;
- else if(argv[1][0] == 'a')
- Refuse_echo = 0;
- else
- return -1;
- }
- return 0;
- }
- /* set for unix end of line for remote echo mode telnet */
- int
- doeol(argc,argv,p)
- int argc;
- char *argv[];
- void *p;
- {
- if(argc < 2){
- if(Tn_cr_mode)
- tprintf("null\n");
- else
- tprintf("standard\n");
- } else {
- if(argv[1][0] == 'n')
- Tn_cr_mode = 1;
- else if(argv[1][0] == 's')
- Tn_cr_mode = 0;
- else {
- tprintf("Usage: %s [standard|null]\n",argv[0]);
- return -1;
- }
- }
- return 0;
- }
-
- /* The guts of the actual Telnet protocol: negotiating options */
- void
- willopt(tn,opt)
- struct telnet *tn;
- int opt;
- {
- int ack;
-
- #ifdef DEBUG
- printf("recv: will ");
- if(uchar(opt) <= NOPTIONS)
- printf("%s\n",T_options[opt]);
- else
- printf("%u\n",opt);
- #endif
-
- switch(uchar(opt)){
- case TN_TRANSMIT_BINARY:
- case TN_ECHO:
- case TN_SUPPRESS_GA:
- if(tn->remote[uchar(opt)] == 1)
- return; /* Already set, ignore to prevent loop */
- if(uchar(opt) == TN_ECHO){
- if(Refuse_echo){
- /* User doesn't want to accept */
- ack = DONT;
- break;
- } else {
- /* Put tty into raw mode */
- tn->session->ttystate.echo = 0;
- tn->session->ttystate.edit = 0;
- }
- }
- tn->remote[uchar(opt)] = 1;
- ack = DO;
- break;
- default:
- ack = DONT; /* We don't know what he's offering; refuse */
- }
- answer(tn,ack,opt);
- }
- void
- wontopt(tn,opt)
- struct telnet *tn;
- int opt;
- {
- #ifdef DEBUG
- printf("recv: wont ");
- if(uchar(opt) <= NOPTIONS)
- printf("%s\n",T_options[uchar(opt)]);
- else
- printf("%u\n",uchar(opt));
- #endif
- if(uchar(opt) <= NOPTIONS){
- if(tn->remote[uchar(opt)] == 0)
- return; /* Already clear, ignore to prevent loop */
- tn->remote[uchar(opt)] = 0;
- if(uchar(opt) == TN_ECHO){
- /* Put tty into cooked mode */
- tn->session->ttystate.echo = 1;
- tn->session->ttystate.edit = 1;
- }
- }
- answer(tn,DONT,opt); /* Must always accept */
- }
- void
- doopt(tn,opt)
- struct telnet *tn;
- int opt;
- {
- int ack;
-
- #ifdef DEBUG
- printf("recv: do ");
- if(uchar(opt) <= NOPTIONS)
- printf("%s\n",T_options[uchar(opt)]);
- else
- printf("%u\n",uchar(opt));
- #endif
- switch(uchar(opt)){
- #ifdef FUTURE /* Use when local options are implemented */
- if(tn->local[uchar(opt)] == 1)
- return; /* Already set, ignore to prevent loop */
- tn->local[uchar(opt)] = 1;
- ack = WILL;
- break;
- #endif
- default:
- ack = WONT; /* Don't know what it is */
- }
- answer(tn,ack,opt);
- }
- void
- dontopt(tn,opt)
- struct telnet *tn;
- int opt;
- {
- #ifdef DEBUG
- printf("recv: dont ");
- if(uchar(opt) <= NOPTIONS)
- printf("%s\n",T_options[uchar(opt)]);
- else
- printf("%u\n",uchar(opt));
- #endif
- if(uchar(opt) <= NOPTIONS){
- if(tn->local[uchar(opt)] == 0){
- /* Already clear, ignore to prevent loop */
- return;
- }
- tn->local[uchar(opt)] = 0;
- }
- answer(tn,WONT,opt);
- }
- void
- answer(tn,r1,r2)
- struct telnet *tn;
- int r1,r2;
- {
- char s[3];
-
- #ifdef DEBUG
- switch(r1){
- case WILL:
- printf("sent: will ");
- break;
- case WONT:
- printf("sent: wont ");
- break;
- case DO:
- printf("sent: do ");
- break;
- case DONT:
- printf("sent: dont ");
- break;
- }
- if(r2 <= 6)
- printf("%s\n",T_options[r2]);
- else
- printf("%u\n",r2);
- #endif
-
- s[0] = IAC;
- s[1] = r1;
- s[2] = r2;
- send(tn->session->s,s,3,0);
- }
-