diff options
Diffstat (limited to 'usr.sbin/portmap/from_local.c')
| -rw-r--r-- | usr.sbin/portmap/from_local.c | 147 |
1 files changed, 147 insertions, 0 deletions
diff --git a/usr.sbin/portmap/from_local.c b/usr.sbin/portmap/from_local.c new file mode 100644 index 0000000..dc5583a --- /dev/null +++ b/usr.sbin/portmap/from_local.c @@ -0,0 +1,147 @@ + /* + * Check if an address belongs to the local system. Adapted from: + * + * @(#)pmap_svc.c 1.32 91/03/11 Copyright 1984,1990 Sun Microsystems, Inc. + * @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC. + */ + +/* + * Sun RPC is a product of Sun Microsystems, Inc. and is provided for + * unrestricted use provided that this legend is included on all tape + * media and as a part of the software program in whole or part. Users + * may copy or modify Sun RPC without charge, but are not authorized + * to license or distribute it to anyone else except as part of a product or + * program developed by the user or with the express written consent of + * Sun Microsystems, Inc. + * + * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE + * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR + * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. + * + * Sun RPC is provided with no support and without any obligation on the + * part of Sun Microsystems, Inc. to assist in its use, correction, + * modification or enhancement. + * + * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE + * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC + * OR ANY PART THEREOF. + * + * In no event will Sun Microsystems, Inc. be liable for any lost revenue + * or profits or other special, indirect and consequential damages, even if + * Sun has been advised of the possibility of such damages. + * + * Sun Microsystems, Inc. + * 2550 Garcia Avenue + * Mountain View, California 94043 + */ + +#ifndef lint +static char sccsid[] = "@(#) from_local.c 1.2 93/11/16 21:50:02"; +#endif + +#ifdef TEST +#undef perror +#endif + +#include <sys/types.h> +#include <sys/socket.h> +#include <netdb.h> +#include <netinet/in.h> +#include <net/if.h> +#include <sys/ioctl.h> +#include <syslog.h> + +#ifndef TRUE +#define TRUE 1 +#define FALSE 0 +#endif + +/* How many interfaces could there be on a computer? */ + +#define MAX_LOCAL 16 +static int num_local = -1; +static struct in_addr addrs[MAX_LOCAL]; + +/* find_local - find all IP addresses for this host */ + +find_local() +{ + struct ifconf ifc; + struct ifreq ifreq; + struct ifreq *ifr; + struct ifreq *the_end; + int sock; + char buf[MAX_LOCAL * sizeof(struct ifreq)]; + + /* Get list of network interfaces. */ + + if ((sock = socket(PF_INET, SOCK_DGRAM, 0)) < 0) { + perror("socket"); + return (0); + } + ifc.ifc_len = sizeof(buf); + ifc.ifc_buf = buf; + if (ioctl(sock, SIOCGIFCONF, (char *) &ifc) < 0) { + perror("SIOCGIFCONF"); + (void) close(sock); + return (0); + } + /* Get IP address of each active IP network interface. */ + + the_end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); + num_local = 0; + for (ifr = ifc.ifc_req; ifr < the_end; ifr++) { + if (ifr->ifr_addr.sa_family == AF_INET) { /* IP net interface */ + ifreq = *ifr; + if (ioctl(sock, SIOCGIFFLAGS, (char *) &ifreq) < 0) { + perror("SIOCGIFFLAGS"); + } else if (ifreq.ifr_flags & IFF_UP) { /* active interface */ + if (ioctl(sock, SIOCGIFADDR, (char *) &ifreq) < 0) { + perror("SIOCGIFADDR"); + } else { + addrs[num_local++] = ((struct sockaddr_in *) + & ifreq.ifr_addr)->sin_addr; + } + } + } + if (num_local >= MAX_LOCAL) + break; + /* Support for variable-length addresses. */ + ifr = (struct ifreq *) ((caddr_t) ifr + + ifr->ifr_addr.sa_len - sizeof(struct sockaddr)); + } + (void) close(sock); + return (num_local); +} + +/* from_local - determine whether request comes from the local system */ + +from_local(addr) +struct sockaddr_in *addr; +{ + int i; + + if (num_local == -1 && find_local() == 0) + syslog(LOG_ERR, "cannot find any active local network interfaces"); + + for (i = 0; i < num_local; i++) { + if (memcmp((char *) &(addr->sin_addr), (char *) &(addrs[i]), + sizeof(struct in_addr)) == 0) + return (TRUE); + } + return (FALSE); +} + +#ifdef TEST + +main() +{ + char *inet_ntoa(); + int i; + + find_local(); + for (i = 0; i < num_local; i++) + printf("%s\n", inet_ntoa(addrs[i])); +} + +#endif |
