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Diffstat (limited to 'contrib/amd/libamu/wire.c')
| -rw-r--r-- | contrib/amd/libamu/wire.c | 404 |
1 files changed, 404 insertions, 0 deletions
diff --git a/contrib/amd/libamu/wire.c b/contrib/amd/libamu/wire.c new file mode 100644 index 0000000..f610f92 --- /dev/null +++ b/contrib/amd/libamu/wire.c @@ -0,0 +1,404 @@ +/* + * Copyright (c) 1997-1998 Erez Zadok + * Copyright (c) 1990 Jan-Simon Pendry + * Copyright (c) 1990 Imperial College of Science, Technology & Medicine + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Jan-Simon Pendry at Imperial College, London. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * %W% (Berkeley) %G% + * + * $Id: wire.c,v 5.2.2.2 1992/06/07 18:06:46 jsp Exp jsp $ + * + */ + +/* + * This function returns the subnet (address&netmask) for the primary network + * interface. If the resulting address has an entry in the hosts file, the + * corresponding name is retuned, otherwise the address is returned in + * standard internet format. + * As a side-effect, a list of local IP/net address is recorded for use + * by the islocalnet() function. + * + * Derived from original by Paul Anderson (23/4/90) + * Updates from Dirk Grunwald (11/11/91) + */ + +#ifdef HAVE_CONFIG_H +# include <config.h> +#endif /* HAVE_CONFIG_H */ +#include <am_defs.h> +#include <amu.h> + + +/* + * List of locally connected networks + */ +typedef struct addrlist addrlist; +struct addrlist { + addrlist *ip_next; + u_long ip_addr; /* address of network */ + u_long ip_mask; + char *ip_net_num; /* number of network */ + char *ip_net_name; /* name of network */ +}; +static addrlist *localnets = NULL; + +#if defined(IFF_LOCAL_LOOPBACK) && !defined(IFF_LOOPBACK) +# define IFF_LOOPBACK IFF_LOCAL_LOOPBACK +#endif /* defined(IFF_LOCAL_LOOPBACK) && !defined(IFF_LOOPBACK) */ + +#if defined(HAVE_FIELD_STRUCT_IFREQ_IFR_ADDR) && defined(HAVE_FIELD_STRUCT_SOCKADDR_SA_LEN) +# define SIZE(ifr) (MAX((ifr)->ifr_addr.sa_len, sizeof((ifr)->ifr_addr)) + sizeof(ifr->ifr_name)) +#else /* not defined(HAVE_FIELD_STRUCT_IFREQ_IFR_ADDR) && defined(HAVE_FIELD_STRUCT_SOCKADDR_SA_LEN) */ +# define SIZE(ifr) sizeof(struct ifreq) +#endif /* not defined(HAVE_FIELD_STRUCT_IFREQ_IFR_ADDR) && defined(HAVE_FIELD_STRUCT_SOCKADDR_SA_LEN) */ + +#define C(x) ((x) & 0xff) +#define GFBUFLEN 1024 +#define clist (ifc.ifc_ifcu.ifcu_req) +#define count (ifc.ifc_len/sizeof(struct ifreq)) + + +/* return malloc'ed buffer. caller must free it */ +char * +print_wires(void) +{ + addrlist *al; + char s[256]; + int i; + char *buf; + int bufcount = 0; + int buf_size = 1024; + + buf = malloc(1024); + if (!buf) + return NULL; + + if (!localnets) { + sprintf(buf, "No networks.\n"); + return buf; + } + /* check if there's more than one network */ + if (!localnets->ip_next) { + sprintf(buf, + "Network: wire=\"%s\" (netnumber=%s).\n", + localnets->ip_net_name, localnets->ip_net_num); + return buf; + } + buf[0] = '\0'; /* null out buffer before appending */ + for (i = 1, al = localnets; al; al = al->ip_next, i++) { + sprintf(s, "Network %d: wire=\"%s\" (netnumber=%s).\n", + i, al->ip_net_name, al->ip_net_num); + bufcount += strlen(s); + if (bufcount > buf_size) { + buf_size *= 2; + buf = xrealloc(buf, buf_size); + } + strcat(buf, s); + } + return buf; +} + + +void +getwire(char **name1, char **number1) +{ + struct hostent *hp; + struct netent *np; + struct ifconf ifc; + struct ifreq *ifr; + caddr_t cp, cplim; + u_long address, netmask, subnet; + char buf[GFBUFLEN], *s; + int fd = -1; + u_long net; + u_long mask; + u_long subnetshift; + char netNumberBuf[64]; + addrlist *al = NULL, *tail = NULL; + +#ifndef SIOCGIFFLAGS + /* if cannot get interface flags, return nothing */ + plog(XLOG_ERROR, "getwire unable to get interface flags"); + localnets = NULL; + return; +#endif /* not SIOCGIFFLAGS */ + + /* + * Get suitable socket + */ + if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) + goto out; + + /* + * Fill in ifconf details + */ + memset(&buf[0], 0, GFBUFLEN); + ifc.ifc_len = sizeof(buf); + ifc.ifc_buf = buf; + + /* + * Get network interface configurations + */ + if (ioctl(fd, SIOCGIFCONF, (caddr_t) & ifc) < 0) + goto out; + + /* + * Upper bound on array + */ + cplim = buf + ifc.ifc_len; + + /* + * This is some magic to cope with both "traditional" and the + * new 4.4BSD-style struct sockaddrs. The new structure has + * variable length and a size field to support longer addresses. + * AF_LINK is a new definition for 4.4BSD. + */ + + /* + * Scan the list looking for a suitable interface + */ + for (cp = buf; cp < cplim; cp += SIZE(ifr)) { + ifr = (struct ifreq *) cp; + + if (ifr->ifr_addr.sa_family != AF_INET) + continue; + else + address = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; + + /* + * Get interface flags + */ + if (ioctl(fd, SIOCGIFFLAGS, (caddr_t) ifr) < 0) + continue; + + /* + * If the interface is a loopback, or its not running + * then ignore it. + */ +#ifdef IFF_LOOPBACK + if ((ifr->ifr_flags & IFF_LOOPBACK) != 0) + continue; +#endif /* IFF_LOOPBACK */ + /* + * Fix for 0.0.0.0 loopback on SunOS 3.X which defines IFF_ROUTE + * instead of IFF_LOOPBACK. + */ +#ifdef IFF_ROUTE + if (ifr->ifr_flags == (IFF_UP|IFF_RUNNING)) + continue; +#endif /* IFF_ROUTE */ + + /* if the interface is not UP or not RUNNING, skip it */ + if ((ifr->ifr_flags & IFF_RUNNING) == 0 || + (ifr->ifr_flags & IFF_UP) == 0) + continue; + + /* + * Get the netmask of this interface + */ + if (ioctl(fd, SIOCGIFNETMASK, (caddr_t) ifr) < 0) + continue; + + netmask = ((struct sockaddr_in *) &ifr->ifr_addr)->sin_addr.s_addr; + + /* + * Add interface to local network singly linked list + */ + al = ALLOC(struct addrlist); + al->ip_addr = address; + al->ip_mask = netmask; + al->ip_net_name = NO_SUBNET; /* fill in a bit later */ + al->ip_net_num = "0.0.0.0"; /* fill in a bit later */ + al->ip_next = NULL; + /* append to the end of the list */ + if (!localnets) { + localnets = tail = al; + tail->ip_next = NULL; + } else { + tail->ip_next = al; + tail = al; + } + + /* + * Figure out the subnet's network address + */ + subnet = address & netmask; + +#ifdef IN_CLASSA + subnet = htonl(subnet); + + if (IN_CLASSA(subnet)) { + mask = IN_CLASSA_NET; + subnetshift = 8; + } else if (IN_CLASSB(subnet)) { + mask = IN_CLASSB_NET; + subnetshift = 8; + } else { + mask = IN_CLASSC_NET; + subnetshift = 4; + } + + /* + * If there are more bits than the standard mask + * would suggest, subnets must be in use. + * Guess at the subnet mask, assuming reasonable + * width subnet fields. + * XXX: Or-in at least 1 byte's worth of 1s to make + * sure the top bits remain set. + */ + while (subnet & ~mask) + mask = (mask >> subnetshift) | 0xff000000; + + net = subnet & mask; + while ((mask & 1) == 0) + mask >>= 1, net >>= 1; + + /* + * Now get a usable name. + * First use the network database, + * then the host database, + * and finally just make a dotted quad. + */ + np = getnetbyaddr(net, AF_INET); + + /* the network address has been masked off */ + if ((subnet & 0xffffff) == 0) { + sprintf(netNumberBuf, "%lu", C(subnet >> 24)); + } else if ((subnet & 0xffff) == 0) { + sprintf(netNumberBuf, "%lu.%lu", + C(subnet >> 24), C(subnet >> 16)); + } else if ((subnet & 0xff) == 0) { + sprintf(netNumberBuf, "%lu.%lu.%lu", + C(subnet >> 24), C(subnet >> 16), + C(subnet >> 8)); + } else { + sprintf(netNumberBuf, "%lu.%lu.%lu.%lu", + C(subnet >> 24), C(subnet >> 16), + C(subnet >> 8), C(subnet)); + } + + /* fill in network number (string) */ + al->ip_net_num = strdup(netNumberBuf); + +#else /* not IN_CLASSA */ + /* This is probably very wrong. */ + np = getnetbyaddr(subnet, AF_INET); +#endif /* not IN_CLASSA */ + + if (np) + s = np->n_name; + else { + subnet = address & netmask; + hp = gethostbyaddr((char *) &subnet, 4, AF_INET); + if (hp) + s = (char *) hp->h_name; + else + s = inet_dquad(buf, subnet); + } + + /* fill in network name (string) */ + al->ip_net_name = strdup(s); + } + +out: + if (fd >= 0) + close(fd); + if (localnets) { + *name1 = localnets->ip_net_name; + *number1 = localnets->ip_net_num; + } else { + *name1 = NO_SUBNET; + *number1 = "0.0.0.0"; + } +} + + +/* + * Make a dotted quad from a 32bit IP address + * addr is in network byte order. + * sizeof(buf) needs to be at least 16. + */ +char * +inet_dquad(char *buf, u_long addr) +{ + addr = ntohl(addr); + sprintf(buf, "%ld.%ld.%ld.%ld", + ((addr >> 24) & 0xff), + ((addr >> 16) & 0xff), + ((addr >> 8) & 0xff), + ((addr >> 0) & 0xff)); + return buf; +} + + +/* + * Determine whether a network is on a local network + * (addr) is in network byte order. + */ +int +islocalnet(u_long addr) +{ + addrlist *al; +#ifdef DEBUG + char buf[16]; +#endif /* DEBUG */ + + for (al = localnets; al; al = al->ip_next) + if (((addr ^ al->ip_addr) & al->ip_mask) == 0) + return TRUE; + +#ifdef DEBUG + plog(XLOG_INFO, "%s is on a remote network", inet_dquad(buf, addr)); +#endif /* DEBUG */ + + return FALSE; +} + + +/* + * Determine whether a network name is one of the local networks + * of a host. + */ +int +is_network_member(const char *net) +{ + addrlist *al; + + for (al = localnets; al; al = al->ip_next) + if (STREQ(net, al->ip_net_name) || STREQ(net, al->ip_net_num)) + return TRUE; + + return FALSE; +} |
