diff options
Diffstat (limited to 'usr.sbin/mrouted/inet.c')
| -rw-r--r-- | usr.sbin/mrouted/inet.c | 235 |
1 files changed, 0 insertions, 235 deletions
diff --git a/usr.sbin/mrouted/inet.c b/usr.sbin/mrouted/inet.c deleted file mode 100644 index 53aad7c63a94..000000000000 --- a/usr.sbin/mrouted/inet.c +++ /dev/null @@ -1,235 +0,0 @@ -/* - * The mrouted program is covered by the license in the accompanying file - * named "LICENSE". Use of the mrouted program represents acceptance of - * the terms and conditions listed in that file. - * - * The mrouted program is COPYRIGHT 1989 by The Board of Trustees of - * Leland Stanford Junior University. - * - * - * inet.c,v 3.8.4.2 1998/01/06 01:57:44 fenner Exp - */ - -#ifndef lint -static const char rcsid[] = - "$FreeBSD$"; -#endif /* not lint */ - -#include "defs.h" - -/* - * Exported variables. - */ -char s1[19]; /* buffers to hold the string representations */ -char s2[19]; /* of IP addresses, to be passed to inet_fmt() */ -char s3[19]; /* or inet_fmts(). */ -char s4[19]; - - -/* - * Verify that a given IP address is credible as a host address. - * (Without a mask, cannot detect addresses of the form {subnet,0} or - * {subnet,-1}.) - */ -int -inet_valid_host(naddr) - u_int32 naddr; -{ - register u_int32 addr; - - addr = ntohl(naddr); - - return (!(IN_MULTICAST(addr) || - IN_BADCLASS (addr) || - (addr & 0xff000000) == 0)); -} - -/* - * Verify that a given netmask is plausible; - * make sure that it is a series of 1's followed by - * a series of 0's with no discontiguous 1's. - */ -int -inet_valid_mask(mask) - u_int32 mask; -{ - if (~(((mask & -mask) - 1) | mask) != 0) { - /* Mask is not contiguous */ - return (FALSE); - } - - return (TRUE); -} - -/* - * Verify that a given subnet number and mask pair are credible. - * - * With CIDR, almost any subnet and mask are credible. mrouted still - * can't handle aggregated class A's, so we still check that, but - * otherwise the only requirements are that the subnet address is - * within the [ABC] range and that the host bits of the subnet - * are all 0. - */ -int -inet_valid_subnet(nsubnet, nmask) - u_int32 nsubnet, nmask; -{ - register u_int32 subnet, mask; - - subnet = ntohl(nsubnet); - mask = ntohl(nmask); - - if ((subnet & mask) != subnet) return (FALSE); - - if (subnet == 0) - return (mask == 0); - - if (IN_CLASSA(subnet)) { - if (mask < 0xff000000 || - (subnet & 0xff000000) == 0x7f000000 || - (subnet & 0xff000000) == 0x00000000) return (FALSE); - } - else if (IN_CLASSD(subnet) || IN_BADCLASS(subnet)) { - /* Above Class C address space */ - return (FALSE); - } - if (subnet & ~mask) { - /* Host bits are set in the subnet */ - return (FALSE); - } - if (!inet_valid_mask(mask)) { - /* Netmask is not contiguous */ - return (FALSE); - } - - return (TRUE); -} - - -/* - * Convert an IP address in u_long (network) format into a printable string. - */ -char * -inet_fmt(addr, s) - u_int32 addr; - char *s; -{ - register u_char *a; - - a = (u_char *)&addr; - sprintf(s, "%u.%u.%u.%u", a[0], a[1], a[2], a[3]); - return (s); -} - - -/* - * Convert an IP subnet number in u_long (network) format into a printable - * string including the netmask as a number of bits. - */ -char * -inet_fmts(addr, mask, s) - u_int32 addr, mask; - char *s; -{ - register u_char *a, *m; - int bits; - - if ((addr == 0) && (mask == 0)) { - sprintf(s, "default"); - return (s); - } - a = (u_char *)&addr; - m = (u_char *)&mask; - bits = 33 - ffs(ntohl(mask)); - - if (m[3] != 0) sprintf(s, "%u.%u.%u.%u/%d", a[0], a[1], a[2], a[3], - bits); - else if (m[2] != 0) sprintf(s, "%u.%u.%u/%d", a[0], a[1], a[2], bits); - else if (m[1] != 0) sprintf(s, "%u.%u/%d", a[0], a[1], bits); - else sprintf(s, "%u/%d", a[0], bits); - - return (s); -} - -/* - * Convert the printable string representation of an IP address into the - * u_long (network) format. Return 0xffffffff on error. (To detect the - * legal address with that value, you must explicitly compare the string - * with "255.255.255.255".) - */ -u_int32 -inet_parse(s,n) - char *s; - int n; -{ - u_int32 a = 0; - u_int a0 = 0, a1 = 0, a2 = 0, a3 = 0; - int i; - char c; - - i = sscanf(s, "%u.%u.%u.%u%c", &a0, &a1, &a2, &a3, &c); - if (i < n || i > 4 || a0 > 255 || a1 > 255 || a2 > 255 || a3 > 255) - return (0xffffffff); - - ((u_char *)&a)[0] = a0; - ((u_char *)&a)[1] = a1; - ((u_char *)&a)[2] = a2; - ((u_char *)&a)[3] = a3; - - return (a); -} - - -/* - * inet_cksum extracted from: - * P I N G . C - * - * Author - - * Mike Muuss - * U. S. Army Ballistic Research Laboratory - * December, 1983 - * Modified at Uc Berkeley - * - * (ping.c) Status - - * Public Domain. Distribution Unlimited. - * - * I N _ C K S U M - * - * Checksum routine for Internet Protocol family headers (C Version) - * - */ -int -inet_cksum(addr, len) - u_short *addr; - u_int len; -{ - register int nleft = (int)len; - register u_short *w = addr; - u_short answer = 0; - register int sum = 0; - - /* - * Our algorithm is simple, using a 32 bit accumulator (sum), - * we add sequential 16 bit words to it, and at the end, fold - * back all the carry bits from the top 16 bits into the lower - * 16 bits. - */ - while (nleft > 1) { - sum += *w++; - nleft -= 2; - } - - /* mop up an odd byte, if necessary */ - if (nleft == 1) { - *(u_char *) (&answer) = *(u_char *)w ; - sum += answer; - } - - /* - * add back carry outs from top 16 bits to low 16 bits - */ - sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */ - sum += (sum >> 16); /* add carry */ - answer = ~sum; /* truncate to 16 bits */ - return (answer); -} |