conn.c

unix v7是最后一个广泛发布的研究型UNIX版本

#define CONN
#include "uucp.h"
#include <signal.h>
#include <sgtty.h>
#include <setjmp.h>
#include <ctype.h>
#include <sys/types.h>
#include <time.h>


#define F_NAME 0
#define F_TIME 1
#define F_LINE 2
#define F_SPEED 3
#define F_PHONE 4
#define F_LOGIN 5

jmp_buf Sjbuf;
#define INVOKE(a, r) ret = a; if (ret<0) return(r);
/*******
 *	conn(system)
 *	char *system;
 *
 *	conn - place a telephone call to system and
 *	login, etc.
 *
 *	return codes:
 *		CF_SYSTEM: don't know system
 *		CF_TIME: wrong time to call
 *		CF_DIAL: call failed
 *		CF_LOGIN: login/password dialog failed
 *
 *		>0  - file no.  -  connect ok
 *
 */

conn(system)
char *system;
{
	int ret, nf;
	int fn;
	char *flds[50];
	DEBUG(4, "gdial %s\n", "called");
	INVOKE(gdial(), CF_DIAL)
	DEBUG(4, "finds %s\n", "called");
	INVOKE(nf = finds(system, flds), nf)
	DEBUG(4, "getto %s\n", "called");
	INVOKE(fn = getto(flds), CF_DIAL)
	DEBUG(4, "login %s\n", "called");
	INVOKE(login(nf, flds, fn), CF_LOGIN)
	return(fn);
}

/***
 *	char *
 *	lastc(s)	return pointer to last character
 *	char *s;
 *
 */

char *
lastc(s)
char *s;
{
	while (*s != '\0') s++;
	return(s);
}

#define MAXDEV 10
#define MAXDCH MAXDEV*20
#define MAXCODE 30
#define MAXCCH MAXCODE*20
	/* This array tells us about possible acu's, etc. */
struct Devices {
	char *D_line;
	char *D_acu;
	int D_speed;
	} Devs [MAXDEV];

char Devbuff[MAXDCH];

struct Codes {
	char *C_locs;
	char *C_prefix;
	} Dialcodes [MAXCODE];

char Codebuff[MAXCCH];
int Dcfull = 0;


/***
 *	gdial()		get device and dial info
 *
 *	return codes:  0  |  FAIL
 */

gdial()
{
	char *flds[10], *lt;
	char *lb = Devbuff;
	char *lc = Codebuff;
	FILE *fn;
	int nr;
	struct Devices *pd;
	struct Codes *pc;
	if (Dcfull) return(0);

	fn = fopen(Devfile, "r");
	ASSERT(fn != NULL, "CAN'T OPEN %s", Devfile);
	for (pd = Devs; fgets(lb, 200, fn); pd++) {
		lt = lastc(lb);
		nr = getargs(lb, flds);
		ASSERT(nr == 3, "BAD LINE %s", lb);
		pd->D_line = flds[0];
		pd->D_acu = flds[1];
		pd->D_speed = atoi(flds[2]);
		lb = lt;
		ASSERT(lb < Devbuff + MAXDCH, "TOO LONG %s", Devbuff);
		ASSERT(pd < Devs + MAXDEV, "TOO MANY DEVICES %d", MAXCODE);
	}
	pd->D_line = NULL;
	fclose(fn);
	ASSERT(pd > Devs, "BAD FILE %s", Devfile);
	/* Now dialcodes, same way */
	fn = fopen(Dialfile, "r");
	ASSERT(fn != NULL, "CAN'T OPEN %s", Dialfile);
	for (pc = Dialcodes; fgets(lc, 200, fn); pc++) {
		lt = lastc(lc);
		nr = getargs(lc, flds);
		if (nr == 1) flds[nr++] = "";
		ASSERT(nr == 2, "BAD LINE %s", lc);
		pc->C_locs = flds[0];
		pc->C_prefix = flds[1];
		lc = lt;
		ASSERT(lc < Codebuff + MAXCCH, "TOO LONG %s", Codebuff);
		ASSERT(pc < Dialcodes + MAXCODE, "MANY DEVICES %d", MAXCODE);
	}
	pc->C_locs = 0;
	fclose(fn);
	return(0);
}


/***
 *	ckdev(type, speed, ndev)
 *	char *type, *speed;
 *	int ndev;
 *
 *	ckdev  -  return the device number in table Devs for
 *	a device with proper attributes.
 *
 *	return codes: >= 0 (ok)  |  FAIL
 */

ckdev(type, speed, ndev)
char *type, *speed;
int ndev;
{
	int sp, acu;
	struct Devices *pd;

	sp = atoi(speed);
	acu =(strcmp(type, "ACU") == SAME);
	for (pd = &Devs[ndev]; pd->D_line != NULL; pd++) {
		if (sp != pd->D_speed)
			continue;
		if (acu && (strcmp(pd->D_acu, "0") != SAME)
		    && !mlock(pd->D_line))
			return(ndev = pd - Devs);
		if (!acu && (strcmp(pd->D_line, type) == SAME)
		    && !mlock(type))
			return(ndev = pd - Devs);
	}
	return(FAIL);
}


/***
 *	getto(flds)		connect to remote machine
 *	char *flds[];
 *
 *	return codes:
 *		>0  -  file number - ok
 *		FAIL  -  failed
 */

getto(flds)
char *flds[];
{
	DEBUG(F_PHONE, "call: no. %s ", flds[4]);
	DEBUG(4, "for sys %s ", flds[F_NAME]);

	if (strcmp(flds[F_LINE], "ACU") == SAME)
		return(call(flds));
	else
		return(direct(flds));
}

/***
 *	call(flds)		call remote machine
 *	char *flds[];
 *
 *	"flds" contains the call information (name, date, type, speed,
 *	phone no. ...
 *	Ndev has the device no.
 *
 *	return codes:
 *		>0  -  file number  -  ok
 *		FAIL  -  failed
 */

call(flds)
char *flds[];
{
	char *pno, pref[20], phone[20];
	char *s1, *s2;
	int dcr;
	struct Codes *pc;

	pno = flds[F_PHONE];
	s1 = pref; s2 = pno;
	while (isalpha(*s2))
		*s1++ = *s2++;
	*s1 = '\0';
	for (pc = Dialcodes; pc->C_locs; pc++)
		if (strcmp(pc->C_locs, pref) == SAME) {
			s1 = pc->C_prefix;
			break;
		}
	sprintf(phone, "%s%s", s1, s2);
	DEBUG(4, "Dial %s\n", phone);
	dcr = dialup(phone, flds);
	DEBUG(4, "dcr returned as %d\n", dcr);
	if (dcr == FAIL)
		return(FAIL);
	return(dcr);

}

	/*  file descriptor for call unit  */
int Dnf = 0;

/***
 *	dialup(ph, flds)	dial remote machine
 *	char *ph;
 *	char *flds[];
 *
 *	return codes:
 *		file descriptor  -  succeeded
 *		FAIL  -  failed
 */

dialup(ph, flds)
char *ph;
char *flds[];
{
	char dcname[20], dnname[20], phone[20];
	struct Devices *pd;
	int nw, lt, pid, dcf, ndev;
	extern int Error;
	extern alarmtr();

	for (ndev = 0;;ndev++) {
		ndev = ckdev(flds[F_LINE], flds[F_SPEED], ndev);
		if (ndev < 0) {
			logent("AVAILABLE DEVICE", "NO");
			DEBUG(4, "NO AVAILABLE DEVICE %s\n", "");
			return(FAIL);
		}
		pd = &Devs[ndev];
		sprintf(dnname, "/dev/%s", pd->D_acu);
		/*  open call unit  */
		Dnf = open(dnname, 1);
		if (Dnf >= 0)
			break;
		delock(pd->D_line);
	}
	sprintf(dcname, "/dev/%s", pd->D_line);
	sprintf(phone, "%s%s", ph, ACULAST);
	DEBUG(4, "dc - %s, ", dcname);
	DEBUG(4, "acu - %s\n", dnname);
	if (setjmp(Sjbuf)) {
		DEBUG(1, "DN write %s\n", "timeout");
		logent("DIALUP DN write", "TIMEOUT");
		kill(pid, 9);
		close(Dnf);
		return(FAIL);
	}
	signal(SIGALRM, alarmtr);
	alarm(30);
	if ((pid = fork()) == 0) {
		sleep(2);
		fclose(stdin);
		fclose(stdout);
		nw = write(Dnf, phone, lt = strlen(phone));
		if (nw != lt) {
			DEBUG(1, "ACU write %s\n", "error");
			logent("DIALUP ACU write", "FAILED");
			exit(1);
		}
		DEBUG(4, "ACU write ok%s\n", "");
		exit(0);
	}
	/*  open line - will return on carrier */
	dcf = open(dcname, 2);
	DEBUG(4, "dcf is %d\n", dcf);
	if (dcf < 0) {
		DEBUG(1, "Line open %s\n", "failed");
		logent("DIALUP LINE open", "FAILED");
		alarm(0);
		return(FAIL);
	}
	ioctl(dcf, TIOCHPCL, 0);
	nw = wait(&lt);
	alarm(0);
	fflush(stdout);
	fixline(dcf, pd->D_speed);
	DEBUG(4, "Forked %d ", pid);
	DEBUG(4, "Wait got %d ", nw);
	DEBUG(4, "Status %o\n", lt);
	if (lt != 0) {
		close(dcf);
		return(FAIL);
	}
	return(dcf);
}


/***
 *	clsacu()	close call unit
 *
 *	return codes:  none
 */

clsacu()
{
	if (Dnf > 0) {
		close(Dnf);
		Dnf = 0;
	}
	return;
}


/***
 *	direct(flds)	connect to hardware line
 *	char *flds[];
 *
 *	return codes:
 *		>0  -  file number  -  ok
 *		FAIL  -  failed
 */

direct(flds)
char *flds[];
{
	int dcr, ndev;
	char dcname[20];

	ndev = 0;
	if ((ndev = ckdev(flds[F_LINE], flds[F_SPEED], ndev)) < 0) {
		logent("DEVICE", "NOT AVAILABLE");
		return(FAIL);
	}
	sprintf(dcname, "/dev/%s", Devs[ndev].D_line);
	signal(SIGALRM, alarmtr);
	alarm(10);
	if (setjmp(Sjbuf))
		return(FAIL);
	dcr = open(dcname, 2); /* read/write */
	alarm(0);
	if (dcr < 0)
		return(FAIL);
	fflush(stdout);
	fixline(dcr, Devs[ndev].D_speed);
	return(dcr);
}



#define MAXC 300

/***
 *	finds(sysnam, flds)	set system attribute vector
 *	char *sysnam, *flds[];
 *
 *	return codes:
 *		>0  -  number of arguments in vector - succeeded
 *		CF_SYSTEM  -  system name not found
 *		CF_TIME  -  wrong time to call
 */

finds(sysnam, flds)
char *sysnam, *flds[];
{
	FILE *fsys;
	static char info[MAXC];
	char **fnp;
	int na;
	int fnd = 0;

	for (fnp = Sysfiles; *fnp != NULL && !fnd; fnp++) {
		fsys = fopen(*fnp, "r");
		if (fsys == NULL)
			continue;
		while (!fnd && (fgets(info, MAXC, fsys) != NULL)) {
			na = getargs(info, flds);
			if (prefix(sysnam, flds[F_NAME]))
				fnd = 1;
		}
		fclose(fsys);
	}
	if (fnd == 0)
		return(CF_SYSTEM);
	/* format of fields
	 *	0 name;
	 *	1 time
	 *	2 acu/hardwired
	 *	3 speed
	 *	etc
	 */
	if (ifdate(flds[F_TIME]) == 0) {
		DEBUG(1, "Wrong time to call %s\n", sysnam);
		logent(sysnam, "WRONG TIME TO CALL");
		return(CF_TIME);
	}
	return(na);
}


/***
 *	login(nf, flds, dcr)		do log conversation
 *	char *flds[];
 *	int nf;
 *
 *	return codes:  0  |  FAIL
 */

login(nf, flds, fn)
char *flds[];
int nf, fn;
{
	char *want, *altern;
	extern char *index();
	int k, ok;

	ASSERT(nf > 4, "TOO FEW LOG FIELDS %d", nf);
	for (k = F_LOGIN; k < nf; k += 2) {
		want = flds[k];
		ok = FAIL;
		while (ok != 0) {
			altern = index(want, '-');
			if (altern != NULL)
				*altern++ = '\0';
			DEBUG(4, "wanted %s ", want);
			ok = expect(want, fn);
			DEBUG(4, "got %s\n", ok ? "?" : "that");
			if (ok == 0)
				break;
			if (altern == NULL) {
				logent("LOGIN", "FAILED");
				return(FAIL);
			}
			want = index(altern, '-');
			if (want != NULL)
				*want++ = '\0';
			sendthem(altern, fn);
		}
		sleep(2);
		sendthem(flds[k+1], fn);
	}
	return(0);
}


struct sg_spds {int sp_val, sp_name;} spds[] = {
	{ 300,  B300},
	{1200, B1200},
	{4800, B4800},
	{9600, B9600},
	{0, 0} };

/***
 *	fixline(tty, spwant)	set speed/echo/mode...
 *	int tty, spwant;
 *
 *	return codes:  none
 */

fixline(tty, spwant)
int tty, spwant;
{
	struct sgttyb ttbuf;
	struct sg_spds *ps;
	int speed = -1;
	int ret;

	for (ps = spds; ps->sp_val; ps++)
		if (ps->sp_val == spwant)
			speed = ps->sp_name;
	ASSERT(speed >= 0, "BAD SPEED %d", speed);
	ioctl(tty, TIOCGETP, &ttbuf);
	ttbuf.sg_flags |=(ANYP|RAW);
	ttbuf.sg_flags &= ~(ECHO|ALLDELAY);
	ttbuf.sg_ispeed = ttbuf.sg_ospeed = speed;
	DEBUG(4, "Speed: want %d ", spwant);
	DEBUG(4, "use %o ", speed);
	DEBUG(4, "ps %d\n", ps-spds);
	ret = ioctl(tty, TIOCSETP, &ttbuf);
	ASSERT(ret >= 0, "RETURN FROM STTY %d", ret);
	ioctl(tty, TIOCHPCL, 0);
	ioctl(tty, TIOCEXCL, 0);
	return;
}


#define MR 300

int Error = 0;

/***
 *	expect(str, fn)	look for expected string
 *	char *str;
 *
 *	return codes:
 *		0  -  found
 *		FAIL  -  lost line or too many characters read
 *		some character  -  timed out
 */

expect(str, fn)
char *str;
int fn;
{
	static char rdvec[MR];
	extern alarmtr();
	char *rp = rdvec;
	int nextch = 0, kr;

	if (strcmp(str, "\"\"") == SAME)
		return(0);
	*rp = 0;
	if (setjmp(Sjbuf)) {
		return(FAIL);
	}
	signal(SIGALRM, alarmtr);
	while (notin(str, rdvec)) {
		alarm(MAXCHARTIME);
		kr = read(fn, &nextch, 1);
		if (kr <= 0) {
			DEBUG(4, "kr - %d\n", kr);
			alarm(0);
			DEBUG(4, "lost line kr - %d, ", kr);
			DEBUG(4, "fn - %d\n", fn);
			logent("LOGIN", "LOST LINE");
			return(FAIL);
		}
		{
		int c;
		c = nextch & 0177;
		DEBUG(4, "%c", c > 040 ? c : '_');
		}
		if ((*rp = nextch & 0177) != '\0')
			rp++;
		*rp = '\0';
		if (rp >= rdvec + MR)
			return(FAIL);
	}
	alarm(0);
	return(0);
}


/***
 *	alarmtr()  -  catch alarm routine for "expect".
 */

alarmtr()
{
	longjmp(Sjbuf, 1);
}


/***
 *	sendthem(str, fn)	send line of login sequence
 *	char *str;
 *
 *	return codes:  none
 */

sendthem(str, fn)
char *str;
int fn;
{
	int nw, ns;
	int nulls;

	if (prefix("BREAK", str)) {
		sscanf(&str[5], "%1d", &nulls);
		if (nulls <= 0 || nulls > 10)
			nulls = 3;
		/* send break */
		DEBUG(5, "%s,", str);
		DEBUG(5, "%d\n", nulls);
		genbrk(fn, Bspeed, nulls);
		return;
	}

	if (strcmp(str, "EOT") == SAME) {
		write(fn, EOTMSG, strlen(EOTMSG));
		return;
	}
	if (strcmp(str, "") != SAME) {
		nw = write(fn, str, ns = strlen(str));
		ASSERT(nw == ns, "BAD WRITE $s", str);
	}
	write(fn, "\n", 1);
	return;
}


/***
 *	genbrk(fn)	send equivalent to break
 *
 *	return codes;  none
 */

genbrk(fn, bspeed, bnulls)
int fn, bspeed, bnulls;
{
	struct sgttyb ttbuf;
	int ret, sospeed;

	ret = ioctl(fn, TIOCGETP, &ttbuf);
	DEBUG(5, "ioctl ret %d\n", ret);
	sospeed = ttbuf.sg_ospeed;
	ttbuf.sg_ospeed = bspeed;
	ret = ioctl(fn, TIOCSETP, &ttbuf);
	DEBUG(5, "ioctl ret %d\n", ret);
	ret = write(fn, "\0\0\0\0\0\0\0\0\0\0\0\0", bnulls);
	ASSERT(ret > 0, "BAD WRITE genbrk %d", ret);
	ttbuf.sg_ospeed = sospeed;
	ret = ioctl(fn, TIOCSETP, &ttbuf);
	ret = write(fn, "@", 1);
	ASSERT(ret > 0, "BAD WRITE genbrk %d", ret);
	DEBUG(4, "sent BREAK nulls - %d\n", bnulls);
	return;
}


/***
 *	notin(sh, lg)	check for occurrence of substring "sh"
 *	char *sh, *lg;
 *
 *	return codes:
 *		0  -  found the string
 *		1  -  not in the string
 */

notin(sh, lg)
char *sh, *lg;
{
	while (*lg != '\0') {
		if (prefix(sh, lg))
			return(0);
		else
			lg++;
	}
	return(1);
}


/*******
 *	ifdate(s)
 *	char *s;
 *
 *	ifdate  -  this routine will check a string (s)
 *	like "MoTu0800-1730" to see if the present
 *	time is within the given limits.
 *
 *	String alternatives:
 *		Wk - Mo thru Fr
 *		zero or one time means all day
 *		Any - any day
 *
 *	return codes:
 *		0  -  not within limits
 *		1  -  within limits
 */

ifdate(s)
char *s;
{
	static char *days[]={
		"Su", "Mo", "Tu", "We", "Th", "Fr", "Sa", 0
	};
	long clock;
	int i, tl, th, tn, dayok=0;
	struct tm *localtime();
	struct tm *tp;

	time(&clock);
	tp = localtime(&clock);
	while (isalpha(*s)) {
		for (i = 0; days[i]; i++) {
			if (prefix(days[i], s))
				if (tp->tm_wday == i)
					dayok = 1;
		}

		if (prefix("Wk", s))
			if (tp->tm_wday >= 1 && tp->tm_wday <= 5)
				dayok = 1;
		if (prefix("Any", s))
			dayok = 1;
		s++;
	}

	if (dayok == 0)
		return(0);
	i = sscanf(s, "%d-%d", &tl, &th);
	tn = tp->tm_hour * 100 + tp->tm_min;
	if (i < 2)
		return(1);
	if (tn >= tl && tn <= th)
		return(1);
	return(0);
}