/* * "$Id: network.c,v 1.1.1.6 2002/12/24 00:07:31 jlovell Exp $" * * Network interface functions for the Common UNIX Printing System * (CUPS) scheduler. * * Copyright 1997-2003 by Easy Software Products, all rights reserved. * * These coded instructions, statements, and computer programs are the * property of Easy Software Products and are protected by Federal * copyright law. Distribution and use rights are outlined in the file * "LICENSE" which should have been included with this file. If this * file is missing or damaged please contact Easy Software Products * at: * * Attn: CUPS Licensing Information * Easy Software Products * 44141 Airport View Drive, Suite 204 * Hollywood, Maryland 20636-3111 USA * * Voice: (301) 373-9603 * EMail: cups-info@cups.org * WWW: http://www.cups.org */ /* * Include necessary headers. */ #include "cupsd.h" #include #ifdef HAVE_GETIFADDRS /* * Use native getifaddrs() function... */ # include #else /* * Use getifaddrs() emulation... */ # include # ifdef HAVE_SYS_SOCKIO_H # include # endif # ifdef ifa_dstaddr # undef ifa_dstaddr # endif /* ifa_dstaddr */ # ifndef ifr_netmask # define ifr_netmask ifr_addr # endif /* !ifr_netmask */ struct ifaddrs /**** Interface Structure ****/ { struct ifaddrs *ifa_next; /* Next interface in list */ char *ifa_name; /* Name of interface */ unsigned int ifa_flags; /* Flags (up, point-to-point, etc.) */ struct sockaddr *ifa_addr, /* Network address */ *ifa_netmask, /* Address mask */ *ifa_dstaddr; /* Broadcast or destination address */ void *ifa_data; /* Interface statistics */ }; int getifaddrs(struct ifaddrs **addrs); void freeifaddrs(struct ifaddrs *addrs); #endif /* HAVE_GETIFADDRS */ /* * 'NetIFFind()' - Find a network interface. */ cups_netif_t * /* O - Network interface data */ NetIFFind(const char *name) /* I - Name of interface */ { cups_netif_t *temp; /* Current network interface */ /* * Update the interface list as needed... */ NetIFUpdate(); /* * Search for the named interface... */ for (temp = NetIFList; temp != NULL; temp = temp->next) if (strcasecmp(name, temp->name) == 0) return (temp); return (NULL); } /* * 'NetIFFree()' - Free the current network interface list. */ void NetIFFree(void) { cups_netif_t *next; /* Next interface in list */ /* * Loop through the interface list and free all the records... */ while (NetIFList != NULL) { next = NetIFList->next; free(NetIFList); NetIFList = next; } } /* * 'NetIFUpdate()' - Update the network interface list as needed... */ void NetIFUpdate(void) { cups_netif_t *temp; /* Current interface */ struct ifaddrs *addrs, /* Interface address list */ *addr; /* Current interface address */ struct hostent *host; /* Host lookup info */ /* * Update the network interface list no more often than once a * minute... */ if ((time(NULL) - NetIFTime) < 60) return; NetIFTime = time(NULL); /* * Free the old interfaces... */ NetIFFree(); /* * Grab a new list of interfaces... */ if (getifaddrs(&addrs) < 0) return; for (addr = addrs; addr != NULL; addr = addr->ifa_next) { /* * See if this interface address is IPv4... */ if (addr->ifa_addr == NULL || addr->ifa_addr->sa_family != AF_INET || addr->ifa_netmask == NULL || addr->ifa_name == NULL) continue; /* * OK, we have an IPv4 address, so create a new list node... */ if ((temp = calloc(1, sizeof(cups_netif_t))) == NULL) break; temp->next = NetIFList; NetIFList = temp; /* * Then copy all of the information... */ strlcpy(temp->name, addr->ifa_name, sizeof(temp->name)); memcpy(&(temp->address), addr->ifa_addr, sizeof(temp->address)); memcpy(&(temp->mask), addr->ifa_netmask, sizeof(temp->mask)); if (addr->ifa_dstaddr) memcpy(&(temp->broadcast), addr->ifa_dstaddr, sizeof(temp->broadcast)); if (!(addr->ifa_flags & IFF_POINTOPOINT) && ntohl(temp->address.sin_addr.s_addr) != 0x7f000001) temp->is_local = 1; /* * Finally, try looking up the hostname for the address as needed... */ if (HostNameLookups) { #ifndef __sgi host = gethostbyaddr((char *)&(temp->address.sin_addr), sizeof(struct in_addr), AF_INET); #else host = gethostbyaddr(&(temp->address.sin_addr), sizeof(struct in_addr), AF_INET); #endif /* !__sgi */ } else host = NULL; /* * Map the default server address and localhost to the server name * and localhost, respectively; for all other addresses, use the * dotted notation... */ if (host != NULL) strlcpy(temp->hostname, host->h_name, sizeof(temp->hostname)); else if (ntohl(temp->address.sin_addr.s_addr) == 0x7f000001) strcpy(temp->hostname, "localhost"); else if (temp->address.sin_addr.s_addr == ServerAddr.sin_addr.s_addr) strlcpy(temp->hostname, ServerName, sizeof(temp->hostname)); else { unsigned ip = ntohl(temp->address.sin_addr.s_addr); snprintf(temp->hostname, sizeof(temp->hostname), "%d.%d.%d.%d", (ip >> 24) & 255, (ip >> 16) & 255, (ip >> 8) & 255, ip & 255); } } freeifaddrs(addrs); } #ifndef HAVE_GETIFADDRS /* * 'getifaddrs()' - Get a list of network interfaces on the system. */ int /* O - 0 on success, -1 on error */ getifaddrs(struct ifaddrs **addrs) /* O - List of interfaces */ { int sock; /* Socket */ char buffer[65536], /* Buffer for address info */ *bufptr, /* Pointer into buffer */ *bufend; /* End of buffer */ struct ifconf conf; /* Interface configurations */ struct sockaddr addr; /* Address data */ struct ifreq *ifp; /* Interface data */ int ifpsize; /* Size of interface data */ struct ifaddrs *temp; /* Pointer to current interface */ struct ifreq request; /* Interface request */ /* * Start with an empty list... */ if (addrs == NULL) return (-1); *addrs = NULL; /* * Create a UDP socket to get the interface data... */ memset (&addr, 0, sizeof(addr)); if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) return (-1); /* * Try to get the list of interfaces... */ conf.ifc_len = sizeof(buffer); conf.ifc_buf = buffer; if (ioctl(sock, SIOCGIFCONF, &conf) < 0) { /* * Couldn't get the list of interfaces... */ close(sock); return (-1); } /* * OK, got the list of interfaces, now lets step through the * buffer to pull them out... */ # ifdef HAVE_STRUCT_SOCKADDR_SA_LEN # define sockaddr_len(a) ((a)->sa_len) # else # define sockaddr_len(a) (sizeof(struct sockaddr)) # endif /* HAVE_STRUCT_SOCKADDR_SA_LEN */ for (bufptr = buffer, bufend = buffer + conf.ifc_len; bufptr < bufend; bufptr += ifpsize) { /* * Get the current interface information... */ ifp = (struct ifreq *)bufptr; ifpsize = sizeof(ifp->ifr_name) + sockaddr_len(&(ifp->ifr_addr)); if (ifpsize < sizeof(struct ifreq)) ifpsize = sizeof(struct ifreq); memset(&request, 0, sizeof(request)); memcpy(request.ifr_name, ifp->ifr_name, sizeof(ifp->ifr_name)); /* * Check the status of the interface... */ if (ioctl(sock, SIOCGIFFLAGS, &request) < 0) continue; /* * Allocate memory for a single interface record... */ if ((temp = calloc(1, sizeof(struct ifaddrs))) == NULL) { /* * Unable to allocate memory... */ close(sock); return (-1); } /* * Add this record to the front of the list and copy the name, flags, * and network address... */ temp->ifa_next = *addrs; *addrs = temp; temp->ifa_name = strdup(ifp->ifr_name); temp->ifa_flags = request.ifr_flags; if ((temp->ifa_addr = calloc(1, sockaddr_len(&(ifp->ifr_addr)))) != NULL) memcpy(temp->ifa_addr, &(ifp->ifr_addr), sockaddr_len(&(ifp->ifr_addr))); /* * Try to get the netmask for the interface... */ if (!ioctl(sock, SIOCGIFNETMASK, &request)) { /* * Got it, make a copy... */ if ((temp->ifa_netmask = calloc(1, sizeof(request.ifr_netmask))) != NULL) memcpy(temp->ifa_netmask, &(request.ifr_netmask), sizeof(request.ifr_netmask)); } /* * Then get the broadcast or point-to-point (destination) address, * if applicable... */ if (temp->ifa_flags & IFF_BROADCAST) { /* * Have a broadcast address, so get it! */ if (!ioctl(sock, SIOCGIFBRDADDR, &request)) { /* * Got it, make a copy... */ if ((temp->ifa_dstaddr = calloc(1, sizeof(request.ifr_broadaddr))) != NULL) memcpy(temp->ifa_dstaddr, &(request.ifr_broadaddr), sizeof(request.ifr_broadaddr)); } } else if (temp->ifa_flags & IFF_POINTOPOINT) { /* * Point-to-point interface; grab the remote address... */ if (!ioctl(sock, SIOCGIFDSTADDR, &request)) { temp->ifa_dstaddr = malloc(sizeof(request.ifr_dstaddr)); memcpy(temp->ifa_dstaddr, &(request.ifr_dstaddr), sizeof(request.ifr_dstaddr)); } } } /* * OK, we're done with the socket, close it and return 0... */ close(sock); return (0); } /* * 'freeifaddrs()' - Free an interface list... */ void freeifaddrs(struct ifaddrs *addrs) /* I - Interface list to free */ { struct ifaddrs *next; /* Next interface in list */ while (addrs != NULL) { /* * Make a copy of the next interface pointer... */ next = addrs->ifa_next; /* * Free data values as needed... */ if (addrs->ifa_name) { free(addrs->ifa_name); addrs->ifa_name = NULL; } if (addrs->ifa_addr) { free(addrs->ifa_addr); addrs->ifa_addr = NULL; } if (addrs->ifa_netmask) { free(addrs->ifa_netmask); addrs->ifa_netmask = NULL; } if (addrs->ifa_dstaddr) { free(addrs->ifa_dstaddr); addrs->ifa_dstaddr = NULL; } /* * Free this node and continue to the next... */ free(addrs); addrs = next; } } #endif /* !HAVE_GETIFADDRS */ /* * End of "$Id: network.c,v 1.1.1.6 2002/12/24 00:07:31 jlovell Exp $". */