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Diffstat (limited to 'source/lib/netmask.c')
| -rw-r--r-- | source/lib/netmask.c | 353 |
1 files changed, 353 insertions, 0 deletions
diff --git a/source/lib/netmask.c b/source/lib/netmask.c new file mode 100644 index 00000000000..d9bc06c47a9 --- /dev/null +++ b/source/lib/netmask.c @@ -0,0 +1,353 @@ +/* + Unix SMB/Netbios implementation. + Version 1.9. + code to query kernel netmask + Copyright (C) Andrew Tridgell 1998 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + + +/* working out the netmask for an interface is an incredibly non-portable + thing. We have several possible implementations below, and autoconf + tries each of them to see what works + + Note that this file does _not_ include includes.h. That is so this code + can be called directly from the autoconf tests. That also means + this code cannot use any of the normal Samba debug stuff or defines. + This is standalone code. + +*/ + +#ifndef AUTOCONF +#include "config.h" +#endif + +#ifdef HAVE_NETMASK_IFCONF + +#include <stdio.h> +#include <unistd.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <netdb.h> +#include <sys/ioctl.h> +#include <net/if.h> + +#ifndef SIOCGIFCONF +#include <sys/sockio.h> +#endif + + +/**************************************************************************** + get the netmask address for a local interface +****************************************************************************/ +int get_netmask(struct in_addr *ipaddr, struct in_addr *nmask) +{ + struct ifconf ifc; + char buff[2048]; + int fd, i, n; + struct ifreq *ifr=NULL; + + if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { +#ifdef DEBUG + fprintf(stderr,"socket failed\n"); +#endif + return -1; + } + + ifc.ifc_len = sizeof(buff); + ifc.ifc_buf = buff; + if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) { +#ifdef DEBUG + fprintf(stderr,"SIOCGIFCONF failed\n"); +#endif + close(fd); + return -1; + } + + ifr = ifc.ifc_req; + + n = ifc.ifc_len / sizeof(struct ifreq); + +#ifdef DEBUG + fprintf(stderr,"%d interfaces - looking for %s\n", + n, inet_ntoa(*ipaddr)); +#endif + + /* Loop through interfaces, looking for given IP address */ + for (i=n-1;i>=0;i--) { + if (ioctl(fd, SIOCGIFADDR, &ifr[i]) != 0) { +#ifdef DEBUG + fprintf(stderr,"SIOCGIFADDR failed\n"); +#endif + continue; + } + +#ifdef DEBUG + fprintf(stderr,"interface %s\n", + inet_ntoa((*(struct sockaddr_in *)&ifr[i].ifr_addr).sin_addr)); +#endif + if (ipaddr->s_addr != + (*(struct sockaddr_in *)&ifr[i].ifr_addr).sin_addr.s_addr) { + continue; + } + + if (ioctl(fd, SIOCGIFNETMASK, &ifr[i]) != 0) { +#ifdef DEBUG + fprintf(stderr,"SIOCGIFNETMASK failed\n"); +#endif + close(fd); + return -1; + } + close(fd); + (*nmask) = ((struct sockaddr_in *)&ifr[i].ifr_addr)->sin_addr; +#ifdef DEBUG + fprintf(stderr,"netmask %s\n", inet_ntoa(*nmask)); +#endif + return 0; + } + +#ifdef DEBUG + fprintf(stderr,"interface not found\n"); +#endif + + close(fd); + return -1; +} + +#elif defined(HAVE_NETMASK_IFREQ) + +#include <stdio.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <netdb.h> +#include <sys/ioctl.h> +#include <net/if.h> + +#ifndef SIOCGIFCONF +#include <sys/sockio.h> +#endif + +#ifndef I_STR +#include <sys/stropts.h> +#endif + + +/**************************************************************************** +this should cover most of the rest of systems +****************************************************************************/ + int get_netmask(struct in_addr *ipaddr, struct in_addr *nmask) +{ + struct ifreq ifreq; + struct strioctl strioctl; + struct ifconf *ifc; + char buff[2048]; + int fd, i, n; + struct ifreq *ifr=NULL; + + if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { +#ifdef DEBUG + fprintf(stderr,"socket failed\n"); +#endif + return -1; + } + + ifc = (struct ifconf *)buff; + ifc->ifc_len = BUFSIZ - sizeof(struct ifconf); + strioctl.ic_cmd = SIOCGIFCONF; + strioctl.ic_dp = (char *)ifc; + strioctl.ic_len = sizeof(buff); + if (ioctl(fd, I_STR, &strioctl) < 0) { +#ifdef DEBUG + fprintf(stderr,"SIOCGIFCONF failed\n"); +#endif + close(fd); + return -1; + } + + ifr = (struct ifreq *)ifc->ifc_req; + + /* Loop through interfaces, looking for given IP address */ + n = ifc->ifc_len / sizeof(struct ifreq); + + for (i = 0; i<n; i++, ifr++) { +#ifdef DEBUG + fprintf(stderr,"interface %s\n", + inet_ntoa((*(struct sockaddr_in *)&ifr->ifr_addr).sin_addr.s_addr)); +#endif + if (ipaddr->s_addr == + (*(struct sockaddr_in *) &ifr->ifr_addr).sin_addr.s_addr) { + break; + } + } + +#ifdef DEBUG + if (i == n) { + fprintf(stderr,"interface not found\n"); + close(fd); + return -1; + } +#endif + + ifreq = *ifr; + + strioctl.ic_cmd = SIOCGIFNETMASK; + strioctl.ic_dp = (char *)&ifreq; + strioctl.ic_len = sizeof(struct ifreq); + if (ioctl(fd, I_STR, &strioctl) != 0) { +#ifdef DEBUG + fprintf(stderr,"Failed SIOCGIFNETMASK\n"); +#endif + close(fd); + return -1; + } + + close(fd); + *nmask = ((struct sockaddr_in *)&ifreq.ifr_addr)->sin_addr; +#ifdef DEBUG + fprintf(stderr,"netmask %s\n", inet_ntoa(*nmask)); +#endif + return 0; +} + +#elif defined(HAVE_NETMASK_AIX) + +#include <stdio.h> +#include <sys/types.h> +#include <sys/socket.h> +#include <netinet/in.h> +#include <arpa/inet.h> +#include <netdb.h> +#include <sys/ioctl.h> +#include <net/if.h> + +#ifndef SIOCGIFCONF +#include <sys/sockio.h> +#endif + +/**************************************************************************** +this one is for AIX +****************************************************************************/ + int get_netmask(struct in_addr *ipaddr, struct in_addr *nmask) +{ + char buff[2048]; + int fd, i, n; + struct ifconf ifc; + struct ifreq *ifr=NULL; + + if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { +#ifdef DEBUG + fprintf(stderr,"socket failed\n"); +#endif + return -1; + } + + + ifc.ifc_len = sizeof(buff); + ifc.ifc_buf = buff; + + if (ioctl(fd, SIOCGIFCONF, &ifc) != 0) { +#ifdef DEBUG + fprintf(stderr,"SIOCGIFCONF failed\n"); +#endif + close(fd); + return -1; + } + + ifr = ifc.ifc_req; + /* Loop through interfaces, looking for given IP address */ + i = ifc.ifc_len; + while (i > 0) { +#ifdef DEBUG + fprintf(stderr,"interface %s\n", + inet_ntoa((*(struct sockaddr_in *)&ifr->ifr_addr).sin_addr)); +#endif + if (ipaddr->s_addr == + (*(struct sockaddr_in *) &ifr->ifr_addr).sin_addr.s_addr) { + break; + } + i -= ifr->ifr_addr.sa_len + IFNAMSIZ; + ifr = (struct ifreq*) ((char*) ifr + ifr->ifr_addr.sa_len + + IFNAMSIZ); + } + + +#ifdef DEBUG + if (i <= 0) { + fprintf(stderr,"interface not found\n"); + close(fd); + return -1; + } +#endif + + if (ioctl(fd, SIOCGIFNETMASK, ifr) != 0) { +#ifdef DEBUG + fprintf(stderr,"SIOCGIFNETMASK failed\n"); +#endif + close(fd); + return -1; + } + + close(fd); + + (*nmask) = ((struct sockaddr_in *)&ifr->ifr_addr)->sin_addr; +#ifdef DEBUG + fprintf(stderr,"netmask %s\n", inet_ntoa(*nmask)); +#endif + return 0; +} + +#else /* a dummy version */ +struct in_addr; /* it may not have been declared before */ + int get_netmask(struct in_addr *ipaddr, struct in_addr *nmask) +{ + return -1; +} +#endif + + +#ifdef AUTOCONF +/* this is the autoconf driver to test get_netmask() */ + + main() +{ + char buf[1024]; + struct hostent *hp; + struct in_addr ip, nmask; + + if (gethostname(buf, sizeof(buf)-1) != 0) { + fprintf(stderr,"gethostname failed\n"); + exit(1); + } + + hp = gethostbyname(buf); + + if (!hp) { + fprintf(stderr,"gethostbyname failed\n"); + exit(1); + } + + memcpy((char *)&ip, (char *)hp->h_addr, hp->h_length); + + if (get_netmask(&ip, &nmask) == 0) exit(0); + + fprintf(stderr,"get_netmask failed\n"); + exit(1); +} +#endif |