diff options
Diffstat (limited to 'usr.bin/nc/netcat.c')
| -rw-r--r-- | usr.bin/nc/netcat.c | 64 |
1 files changed, 24 insertions, 40 deletions
diff --git a/usr.bin/nc/netcat.c b/usr.bin/nc/netcat.c index cc62f4a6837..6a7b1bc0d60 100644 --- a/usr.bin/nc/netcat.c +++ b/usr.bin/nc/netcat.c @@ -1,4 +1,4 @@ -/* $OpenBSD: netcat.c,v 1.16 2000/09/26 17:46:40 ericj Exp $ */ +/* $OpenBSD: netcat.c,v 1.17 2000/09/26 18:53:13 ericj Exp $ */ /* Netcat 1.10 RELEASE 960320 * @@ -29,8 +29,6 @@ */ -#define HAVE_BIND /* ASSUMPTION -- seems to work everywhere! */ - #include <sys/types.h> #include <sys/time.h> #include <sys/select.h> @@ -105,9 +103,9 @@ unsigned int o_wait = 0; u_short o_zero = 0; /* Function Prototype's */ -void help __P(()); -void usage __P((int)); +void help __P(()); void nlog __P((int, char *, ...)); +void usage __P((int)); /* * support routines -- the bulk of this thing. Placed in such an order that @@ -121,8 +119,7 @@ void nlog __P((int, char *, ...)); void catch() { - errno = 0; - if (o_verbose > 1) /* normally we don't care */ + if (o_verbose) /* normally we don't care */ nlog(1, "Sent %i Rcvd %i", wrote_net, wrote_out); nlog(1, " punt!"); } @@ -199,7 +196,6 @@ comparehosts(hinfo, hp) struct host_info *hinfo; struct hostent *hp; { - errno = 0; if (strcasecmp(hinfo->name, hp->h_name) != 0) { nlog(0, "DNS fwd/rev mismatch: %s != %s", hinfo->name, hp->h_name); return (1); @@ -224,7 +220,6 @@ gethinfo(name, numeric) struct host_info *hinfo = NULL; int x; - errno = 0; if (name) hinfo = (struct host_info *) calloc(1, sizeof(struct host_info)); @@ -325,9 +320,6 @@ getpinfo(pstring, pnum) struct servent *servent; int x; int y; - char *whichp = "tcp"; - if (o_udpmode) - whichp = "udp"; pinfo->name[0] = '?';/* fast preload */ pinfo->name[1] = '\0'; @@ -345,10 +337,10 @@ getpinfo(pstring, pnum) if (o_nflag) /* go faster, skip getservbyblah */ goto gp_finish; y = htons(x); /* gotta do this -- see Fig.1 below */ - servent = getservbyport(y, whichp); + servent = getservbyport(y, o_udpmode ? "udp" : "tcp"); if (servent) { y = ntohs(servent->s_port); - if (x != y) /* "never happen" */ + if (x != y) nlog(0, "Warning: port-bynum mismatch, %d != %d", x, y); strlcpy(pinfo->name, servent->s_name, sizeof(pinfo->name)); @@ -371,9 +363,9 @@ getpinfo(pstring, pnum) if (x) return (getpinfo(NULL, x)); /* recurse for * numeric-string-arg */ - if (o_nflag) /* can't use names! */ + if (o_nflag) return (0); - servent = getservbyname(pstring, whichp); + servent = getservbyname(pstring, o_udpmode ? "udp" : "tcp"); if (servent) { strlcpy(pinfo->name, servent->s_name, sizeof(pinfo->name)); @@ -481,7 +473,6 @@ doconnect(rad, rp, lad, lp) int nnetfd = 0; int rr; int x, y; - errno = 0; /* grab a socket; set opts */ while (nnetfd == 0) { @@ -522,7 +513,6 @@ doconnect(rad, rp, lad, lp) else { nlog(0, "retrying local %s:%d", inet_ntoa(lclend->sin_addr), lp); sleep(2); - errno = 0; /* clear from sleep */ } } } @@ -572,7 +562,6 @@ dolisten(rad, rp, lad, lp) int x; char *cp; u_short z; - errno = 0; /* * Pass everything off to doconnect, @@ -652,14 +641,13 @@ whoisit: cp = &bigbuf_net[32]; x = sizeof(struct sockaddr); rr = getsockname(nnetfd, (struct sockaddr *) lclend, &x); - if (rr < 0 && o_verbose) + if (rr < 0) nlog(0, "post-rcv getsockname failed"); strcpy(cp, inet_ntoa(lclend->sin_addr)); z = ntohs(remend->sin_port); strcpy(bigbuf_net, inet_ntoa(remend->sin_addr)); whozis = gethinfo(bigbuf_net, o_nflag); - errno = 0; x = 0; if (rad) /* xxx: fix to go down the *list* if we have * one? */ @@ -705,8 +693,8 @@ udptest(fd, where) int rr; rr = write(fd, bigbuf_in, 1); - if (rr != 1 && o_verbose) - nlog(0, "udptest first write failed?! errno %d", errno); + if (rr != 1) + nlog(0, "udptest first write failed: "); if (o_wait) sleep(o_wait); else { @@ -718,7 +706,6 @@ udptest(fd, where) o_wait = 0; o_udpmode++; } - errno = 0; rr = write(fd, bigbuf_in, 1); if (rr == 1) return (fd); @@ -727,7 +714,7 @@ udptest(fd, where) } /* - * oprint : + * oprint : * Hexdump bytes shoveled either way to a running logfile, in the format: * D offset - - - - --- 16 bytes --- - - - - # .... ascii ..... * where "which" sets the direction indicator, D: @@ -918,7 +905,6 @@ readwrite(fd) } if (o_interval) sleep(o_interval); - errno = 0; while (FD_ISSET(fd, &fds1)) { /* i.e. till the *net* closes! */ struct timeval *tv; @@ -1035,7 +1021,6 @@ shovel: } if (o_interval) { sleep(o_interval); - errno = 0; continue; } if ((rzleft) || (rnleft)) { @@ -1069,16 +1054,14 @@ main(argc, argv) u_short curport = 0; char *randports = NULL; -#ifdef HAVE_BIND res_init(); -#endif + lclend = (struct sockaddr_in *) calloc(1, sizeof(struct sockaddr)); remend = (struct sockaddr_in *) calloc(1, sizeof(struct sockaddr)); bigbuf_in = calloc(1, BIGSIZ); bigbuf_net = calloc(1, BIGSIZ); pinfo= (struct port_info *) calloc(1, sizeof(struct port_info)); - errno = 0; gatesptr = 4; /* @@ -1229,14 +1212,14 @@ main(argc, argv) } /* other misc initialization */ - FD_SET(0, &fds1); /* stdin *is* initially open */ + FD_SET(0, &fds1); /* stdin *is* initially open */ if (o_random) { randports = calloc(1, 65536); /* big flag array for ports */ } if (o_wfile) { ofd = open(stage, O_WRONLY | O_CREAT | O_TRUNC, 0664); if (ofd <= 0) /* must be > extant 0/1/2 */ - nlog(1, "Can't open %s", stage); + nlog(1, "%s: ", stage); stage = (unsigned char *) calloc(1, 100); } /* optind is now index of first non -x arg */ @@ -1246,7 +1229,6 @@ main(argc, argv) themaddr = &whereto->iaddrs[0]; if (themaddr) optind++; /* skip past valid host lookup */ - errno = 0; /* * Handle listen mode here, and exit afterward. Only does one connect; @@ -1281,14 +1263,13 @@ main(argc, argv) while (argv[optind]) { hiport = loport = 0; - cp = strchr(argv[optind], '-'); - if (cp) { + if (cp = strchr(argv[optind], '-')) { *cp = '\0'; cp++; hiport = getpinfo(cp, 0); if (hiport == 0) nlog(1, "invalid port %s", cp); - } /* if found a dash */ + } loport = getpinfo(argv[optind], 0); if (loport == 0) nlog(1, "invalid port %s", argv[optind]); @@ -1299,7 +1280,7 @@ main(argc, argv) curport = nextport(randports); } else curport = hiport; - } else /* not a range, including args like "25-25" */ + } else curport = loport; /* * Now start connecting to these things. @@ -1323,7 +1304,7 @@ main(argc, argv) x = readwrite(netfd); } else { x = 1; - if ((Single || (o_verbose > 1)) + if ((Single || (o_verbose)) || (errno != ECONNREFUSED)) { nlog(0, "%s [%s] %d (%s)", whereto->name, whereto->addrs[0], @@ -1337,11 +1318,10 @@ main(argc, argv) curport = nextport(randports); else curport--; - } + } optind++; } - errno = 0; nlog(0, "Sent %i Rcvd %i", wrote_net, wrote_out); if (Single) exit(x); @@ -1364,6 +1344,8 @@ nlog(doexit, fmt) vfprintf(stderr, fmt, args); if (h_errno) herror(NULL); + else if (errno) + fprintf(stderr, "%s\n", strerror(errno)); else putc('\n', stderr); va_end(args); @@ -1371,6 +1353,8 @@ nlog(doexit, fmt) if (doexit) exit(1); + + h_errno = errno = 0; } void |