ftp.c

早期freebsd实现

		return;
	}
	oldintr = signal(SIGINT, abortrecv);
	if (strcmp(local, "-") && *local != '|') {
		if (access(local, 2) < 0) {
			char *dir = strrchr(local, '/');

			if (errno != ENOENT && errno != EACCES) {
				warn("local: %s", local);
				(void) signal(SIGINT, oldintr);
				code = -1;
				return;
			}
			if (dir != NULL)
				*dir = 0;
			d = access(dir ? local : ".", 2);
			if (dir != NULL)
				*dir = '/';
			if (d < 0) {
				warn("local: %s", local);
				(void) signal(SIGINT, oldintr);
				code = -1;
				return;
			}
			if (!runique && errno == EACCES &&
			    chmod(local, 0600) < 0) {
				warn("local: %s", local);
				(void) signal(SIGINT, oldintr);
				(void) signal(SIGINT, oldintr);
				code = -1;
				return;
			}
			if (runique && errno == EACCES &&
			   (local = gunique(local)) == NULL) {
				(void) signal(SIGINT, oldintr);
				code = -1;
				return;
			}
		}
		else if (runique && (local = gunique(local)) == NULL) {
			(void) signal(SIGINT, oldintr);
			code = -1;
			return;
		}
	}
	if (!is_retr) {
		if (curtype != TYPE_A)
			changetype(TYPE_A, 0);
	} else if (curtype != type)
		changetype(type, 0);
	if (initconn()) {
		(void) signal(SIGINT, oldintr);
		code = -1;
		return;
	}
	if (setjmp(recvabort))
		goto abort;
	if (is_retr && restart_point &&
	    command("REST %ld", (long) restart_point) != CONTINUE)
		return;
	if (remote) {
		if (command("%s %s", cmd, remote) != PRELIM) {
			(void) signal(SIGINT, oldintr);
			return;
		}
	} else {
		if (command("%s", cmd) != PRELIM) {
			(void) signal(SIGINT, oldintr);
			return;
		}
	}
	din = dataconn("r");
	if (din == NULL)
		goto abort;
	if (strcmp(local, "-") == 0)
		fout = stdout;
	else if (*local == '|') {
		oldintp = signal(SIGPIPE, SIG_IGN);
		fout = popen(local + 1, "w");
		if (fout == NULL) {
			warn("%s", local+1);
			goto abort;
		}
		closefunc = pclose;
	} else {
		fout = fopen(local, lmode);
		if (fout == NULL) {
			warn("local: %s", local);
			goto abort;
		}
		closefunc = fclose;
	}
	if (fstat(fileno(fout), &st) < 0 || st.st_blksize == 0)
		st.st_blksize = BUFSIZ;
	if (st.st_blksize > bufsize) {
		if (buf)
			(void) free(buf);
		buf = malloc((unsigned)st.st_blksize);
		if (buf == NULL) {
			warn("malloc");
			bufsize = 0;
			goto abort;
		}
		bufsize = st.st_blksize;
	}
	(void) gettimeofday(&start, (struct timezone *)0);
	switch (curtype) {

	case TYPE_I:
	case TYPE_L:
		if (restart_point &&
		    lseek(fileno(fout), restart_point, SEEK_SET) < 0) {
			warn("local: %s", local);
			if (closefunc != NULL)
				(*closefunc)(fout);
			return;
		}
		errno = d = 0;
		while ((c = read(fileno(din), buf, bufsize)) > 0) {
			if ((d = write(fileno(fout), buf, c)) != c)
				break;
			bytes += c;
			if (hash) {
				while (bytes >= hashbytes) {
					(void) putchar('#');
					hashbytes += HASHBYTES;
				}
				(void) fflush(stdout);
			}
		}
		if (hash && bytes > 0) {
			if (bytes < HASHBYTES)
				(void) putchar('#');
			(void) putchar('\n');
			(void) fflush(stdout);
		}
		if (c < 0) {
			if (errno != EPIPE)
				warn("netin");
			bytes = -1;
		}
		if (d < c) {
			if (d < 0)
				warn("local: %s", local);
			else
				warnx("%s: short write", local);
		}
		break;

	case TYPE_A:
		if (restart_point) {
			int i, n, ch;

			if (fseek(fout, 0L, SEEK_SET) < 0)
				goto done;
			n = restart_point;
			for (i = 0; i++ < n;) {
				if ((ch = getc(fout)) == EOF)
					goto done;
				if (ch == '\n')
					i++;
			}
			if (fseek(fout, 0L, SEEK_CUR) < 0) {
done:
				warn("local: %s", local);
				if (closefunc != NULL)
					(*closefunc)(fout);
				return;
			}
		}
		while ((c = getc(din)) != EOF) {
			if (c == '\n')
				bare_lfs++;
			while (c == '\r') {
				while (hash && (bytes >= hashbytes)) {
					(void) putchar('#');
					(void) fflush(stdout);
					hashbytes += HASHBYTES;
				}
				bytes++;
				if ((c = getc(din)) != '\n' || tcrflag) {
					if (ferror(fout))
						goto break2;
					(void) putc('\r', fout);
					if (c == '\0') {
						bytes++;
						goto contin2;
					}
					if (c == EOF)
						goto contin2;
				}
			}
			(void) putc(c, fout);
			bytes++;
	contin2:	;
		}
break2:
		if (bare_lfs) {
			printf("WARNING! %d bare linefeeds received in ASCII mode\n", bare_lfs);
			printf("File may not have transferred correctly.\n");
		}
		if (hash) {
			if (bytes < hashbytes)
				(void) putchar('#');
			(void) putchar('\n');
			(void) fflush(stdout);
		}
		if (ferror(din)) {
			if (errno != EPIPE)
				warn("netin");
			bytes = -1;
		}
		if (ferror(fout))
			warn("local: %s", local);
		break;
	}
	if (closefunc != NULL)
		(*closefunc)(fout);
	(void) signal(SIGINT, oldintr);
	if (oldintp)
		(void) signal(SIGPIPE, oldintp);
	(void) gettimeofday(&stop, (struct timezone *)0);
	(void) fclose(din);
	(void) getreply(0);
	if (bytes > 0 && is_retr)
		ptransfer("received", bytes, &start, &stop);
	return;
abort:

/* abort using RFC959 recommended IP,SYNC sequence  */

	(void) gettimeofday(&stop, (struct timezone *)0);
	if (oldintp)
		(void) signal(SIGPIPE, oldintr);
	(void) signal(SIGINT, SIG_IGN);
	if (!cpend) {
		code = -1;
		(void) signal(SIGINT, oldintr);
		return;
	}

	abort_remote(din);
	code = -1;
	if (data >= 0) {
		(void) close(data);
		data = -1;
	}
	if (closefunc != NULL && fout != NULL)
		(*closefunc)(fout);
	if (din)
		(void) fclose(din);
	if (bytes > 0)
		ptransfer("received", bytes, &start, &stop);
	(void) signal(SIGINT, oldintr);
}

/*
 * Need to start a listen on the data channel before we send the command,
 * otherwise the server's connect may fail.
 */
int
initconn()
{
	char *p, *a;
	int result, len, tmpno = 0;
	int on = 1;

noport:
	data_addr = myctladdr;
	if (sendport)
		data_addr.sin_port = 0;	/* let system pick one */ 
	if (data != -1)
		(void) close(data);
	data = socket(AF_INET, SOCK_STREAM, 0);
	if (data < 0) {
		warn("socket");
		if (tmpno)
			sendport = 1;
		return (1);
	}
	if (!sendport)
		if (setsockopt(data, SOL_SOCKET, SO_REUSEADDR, (char *)&on, sizeof (on)) < 0) {
			warn("setsockopt (reuse address)");
			goto bad;
		}
	if (bind(data, (struct sockaddr *)&data_addr, sizeof (data_addr)) < 0) {
		warn("bind");
		goto bad;
	}
	if (options & SO_DEBUG &&
	    setsockopt(data, SOL_SOCKET, SO_DEBUG, (char *)&on, sizeof (on)) < 0)
		warn("setsockopt (ignored)");
	len = sizeof (data_addr);
	if (getsockname(data, (struct sockaddr *)&data_addr, &len) < 0) {
		warn("getsockname");
		goto bad;
	}
	if (listen(data, 1) < 0)
		warn("listen");
	if (sendport) {
		a = (char *)&data_addr.sin_addr;
		p = (char *)&data_addr.sin_port;
#define	UC(b)	(((int)b)&0xff)
		result =
		    command("PORT %d,%d,%d,%d,%d,%d",
		      UC(a[0]), UC(a[1]), UC(a[2]), UC(a[3]),
		      UC(p[0]), UC(p[1]));
		if (result == ERROR && sendport == -1) {
			sendport = 0;
			tmpno = 1;
			goto noport;
		}
		return (result != COMPLETE);
	}
	if (tmpno)
		sendport = 1;
#ifdef IP_TOS
	on = IPTOS_THROUGHPUT;
	if (setsockopt(data, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
		warn("setsockopt TOS (ignored)");
#endif
	return (0);
bad:
	(void) close(data), data = -1;
	if (tmpno)
		sendport = 1;
	return (1);
}

FILE *
dataconn(lmode)
	char *lmode;
{
	struct sockaddr_in from;
	int s, fromlen = sizeof (from), tos;

	s = accept(data, (struct sockaddr *) &from, &fromlen);
	if (s < 0) {
		warn("accept");
		(void) close(data), data = -1;
		return (NULL);
	}
	(void) close(data);
	data = s;
#ifdef IP_TOS
	tos = IPTOS_THROUGHPUT;
	if (setsockopt(s, IPPROTO_IP, IP_TOS, (char *)&tos, sizeof(int)) < 0)
		warn("setsockopt TOS (ignored)");
#endif
	return (fdopen(data, lmode));
}

void
ptransfer(direction, bytes, t0, t1)
	char *direction;
	long bytes;
	struct timeval *t0, *t1;
{
	struct timeval td;
	float s, bs;

	if (verbose) {
		tvsub(&td, t1, t0);
		s = td.tv_sec + (td.tv_usec / 1000000.);
#define	nz(x)	((x) == 0 ? 1 : (x))
		bs = bytes / nz(s);
		printf("%ld bytes %s in %.2g seconds (%.2g Kbytes/s)\n",
		    bytes, direction, s, bs / 1024.);
	}
}

/*
void
tvadd(tsum, t0)
	struct timeval *tsum, *t0;
{

	tsum->tv_sec += t0->tv_sec;
	tsum->tv_usec += t0->tv_usec;
	if (tsum->tv_usec > 1000000)
		tsum->tv_sec++, tsum->tv_usec -= 1000000;
}
*/

void
tvsub(tdiff, t1, t0)
	struct timeval *tdiff, *t1, *t0;
{

	tdiff->tv_sec = t1->tv_sec - t0->tv_sec;
	tdiff->tv_usec = t1->tv_usec - t0->tv_usec;
	if (tdiff->tv_usec < 0)
		tdiff->tv_sec--, tdiff->tv_usec += 1000000;
}

void
psabort()
{

	abrtflag++;
}

void
pswitch(flag)
	int flag;
{
	sig_t oldintr;
	static struct comvars {
		int connect;
		char name[MAXHOSTNAMELEN];
		struct sockaddr_in mctl;
		struct sockaddr_in hctl;
		FILE *in;
		FILE *out;
		int tpe;
		int curtpe;
		int cpnd;
		int sunqe;
		int runqe;
		int mcse;
		int ntflg;
		char nti[17];
		char nto[17];
		int mapflg;
		char mi[MAXPATHLEN];
		char mo[MAXPATHLEN];
	} proxstruct, tmpstruct;
	struct comvars *ip, *op;

	abrtflag = 0;
	oldintr = signal(SIGINT, psabort);
	if (flag) {
		if (proxy)
			return;
		ip = &tmpstruct;
		op = &proxstruct;
		proxy++;
	} else {
		if (!proxy)
			return;
		ip = &proxstruct;
		op = &tmpstruct;
		proxy = 0;
	}
	ip->connect = connected;
	connected = op->connect;
	if (hostname) {
		(void) strncpy(ip->name, hostname, sizeof(ip->name) - 1);
		ip->name[strlen(ip->name)] = '\0';
	} else
		ip->name[0] = 0;
	hostname = op->name;
	ip->hctl = hisctladdr;
	hisctladdr = op->hctl;
	ip->mctl = myctladdr;
	myctladdr = op->mctl;
	ip->in = cin;
	cin = op->in;
	ip->out = cout;
	cout = op->out;
	ip->tpe = type;
	type = op->tpe;
	ip->curtpe = curtype;
	curtype = op->curtpe;
	ip->cpnd = cpend;
	cpend = op->cpnd;
	ip->sunqe = sunique;
	sunique = op->sunqe;
	ip->runqe = runique;
	runique = op->runqe;
	ip->mcse = mcase;
	mcase = op->mcse;
	ip->ntflg = ntflag;
	ntflag = op->ntflg;
	(void) strncpy(ip->nti, ntin, 16);
	(ip->nti)[strlen(ip->nti)] = '\0';
	(void) strcpy(ntin, op->nti);
	(void) strncpy(ip->nto, ntout, 16);
	(ip->nto)[strlen(ip->nto)] = '\0';
	(void) strcpy(ntout, op->nto);
	ip->mapflg = mapflag;
	mapflag = op->mapflg;
	(void) strncpy(ip->mi, mapin, MAXPATHLEN - 1);
	(ip->mi)[strlen(ip->mi)] = '\0';
	(void) strcpy(mapin, op->mi);
	(void) strncpy(ip->mo, mapout, MAXPATHLEN - 1);
	(ip->mo)[strlen(ip->mo)] = '\0';
	(void) strcpy(mapout, op->mo);
	(void) signal(SIGINT, oldintr);
	if (abrtflag) {
		abrtflag = 0;
		(*oldintr)(SIGINT);
	}
}

void
abortpt()
{

	printf("\n");
	(void) fflush(stdout);
	ptabflg++;
	mflag = 0;
	abrtflag = 0;
	longjmp(ptabort, 1);
}

void
proxtrans(cmd, local, remote)
	char *cmd, *local, *remote;
{
	sig_t oldintr;
	int secndflag = 0, prox_type, nfnd;
	char *cmd2;
	struct fd_set mask;

	if (strcmp(cmd, "RETR"))
		cmd2 = "RETR";
	else
		cmd2 = runique ? "STOU" : "STOR";
	if ((prox_type = type) == 0) {
		if (unix_server && unix_proxy)
			prox_type = TYPE_I;
		else
			prox_type = TYPE_A;
	}
	if (curtype != prox_type)
		changetype(prox_type, 1);
	if (command("PASV") != COMPLETE) {
		printf("proxy server does not support third party transfers.\n");
		return;
	}
	pswitch(0);
	if (!connected) {
		printf("No primary connection\n");
		pswitch(1);
		code = -1;
		return;
	}
	if (curtype != prox_type)
		changetype(prox_type, 1);
	if (command("PORT %s", pasv) != COMPLETE) {
		pswitch(1);
		return;
	}
	if (setjmp(ptabort))
		goto abort;
	oldintr = signal(SIGINT, abortpt);
	if (command("%s %s", cmd, remote) != PRELIM) {
		(void) signal(SIGINT, oldintr);
		pswitch(1);
		return;
	}
	sleep(2);
	pswitch(1);
	secndflag++;
	if (command("%s %s", cmd2, local) != PRELIM)
		goto abort;
	ptflag++;
	(void) getreply(0);
	pswitch(0);
	(void) getreply(0);
	(void) signal(SIGINT, oldintr);
	pswitch(1);
	ptflag = 0;
	printf("local: %s remote: %s\n", local, remote);
	return;
abort:
	(void) signal(SIGINT, SIG_IGN);
	ptflag = 0;
	if (strcmp(cmd, "RETR") && !proxy)
		pswitch(1);
	else if (!strcmp(cmd, "RETR") && proxy)
		pswitch(0);
	if (!cpend && !secndflag) {  /* only here if cmd = "STOR" (proxy=1) */
		if (command("%s %s", cmd2, local) != PRELIM) {
			pswitch(0);
			if (cpend)
				abort_remote((FILE *) NULL);
		}
		pswitch(1);
		if (ptabflg)
			code = -1;
		(void) signal(SIGINT, oldintr);
		return;
	}
	if (cpend)
		abort_remote((FILE *) NULL);
	pswitch(!proxy);
	if (!cpend && !secndflag) {  /* only if cmd = "RETR" (proxy=1) */
		if (command("%s %s", cmd2, local) != PRELIM) {
			pswitch(0);
			if (cpend)
				abort_remote((FILE *) NULL);
			pswitch(1);
			if (ptabflg)
				code = -1;
			(void) signal(SIGINT, oldintr);
			return;
		}
	}
	if (cpend)
		abort_remote((FILE *) NULL);
	pswitch(!proxy);
	if (cpend) {
		FD_ZERO(&mask);
		FD_SET(fileno(cin), &mask);
		if ((nfnd = empty(&mask, 10)) <= 0) {
			if (nfnd < 0) {
				warn("abort");
			}
			if (ptabflg)
				code = -1;
			lostpeer();
		}
		(void) getreply(0);
		(void) getreply(0);
	}
	if (proxy)
		pswitch(0);
	pswitch(1);
	if (ptabflg)
		code = -1;
	(void) signal(SIGINT, oldintr);
}

void
reset(argc, argv)
	int argc;
	char *argv[];
{
	struct fd_set mask;
	int nfnd = 1;

	FD_ZERO(&mask);
	while (nfnd > 0) {
		FD_SET(fileno(cin), &mask);
		if ((nfnd = empty(&mask,0)) < 0) {
			warn("reset");
			code = -1;
			lostpeer();
		}
		else if (nfnd) {
			(void) getreply(0);
		}
	}
}

char *
gunique(local)
	char *local;
{
	static char new[MAXPATHLEN];
	char *cp = strrchr(local, '/');
	int d, count=0;
	char ext = '1';

	if (cp)
		*cp = '\0';
	d = access(cp ? local : ".", 2);
	if (cp)
		*cp = '/';
	if (d < 0) {
		warn("local: %s", local);
		return ((char *) 0);
	}
	(void) strcpy(new, local);
	cp = new + strlen(new);
	*cp++ = '.';
	while (!d) {
		if (++count == 100) {
			printf("runique: can't find unique file name.\n");
			return ((char *) 0);
		}
		*cp++ = ext;
		*cp = '\0';
		if (ext == '9')
			ext = '0';
		else
			ext++;
		if ((d = access(new, 0)) < 0)
			break;
		if (ext != '0')
			cp--;
		else if (*(cp - 2) == '.')
			*(cp - 1) = '1';
		else {
			*(cp - 2) = *(cp - 2) + 1;
			cp--;
		}
	}
	return (new);
}

void
abort_remote(din)
	FILE *din;
{
	char buf[BUFSIZ];
	int nfnd;
	struct fd_set mask;

	/*
	 * send IAC in urgent mode instead of DM because 4.3BSD places oob mark
	 * after urgent byte rather than before as is protocol now
	 */
	sprintf(buf, "%c%c%c", IAC, IP, IAC);
	if (send(fileno(cout), buf, 3, MSG_OOB) != 3)
		warn("abort");
	fprintf(cout,"%cABOR\r\n", DM);
	(void) fflush(cout);
	FD_ZERO(&mask);
	FD_SET(fileno(cin), &mask);
	if (din) { 
		FD_SET(fileno(din), &mask);
	}
	if ((nfnd = empty(&mask, 10)) <= 0) {
		if (nfnd < 0) {
			warn("abort");
		}
		if (ptabflg)
			code = -1;
		lostpeer();
	}
	if (din && FD_ISSET(fileno(din), &mask)) {
		while (read(fileno(din), buf, BUFSIZ) > 0)
			/* LOOP */;
	}
	if (getreply(0) == ERROR && code == 552) {
		/* 552 needed for nic style abort */
		(void) getreply(0);
	}
	(void) getreply(0);
}