iputils-ss020927.zip_iputi_iputils-ss

/* * Rdisc (this program) was developed by 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 Rdisc without charge, and they may freely * distribute it. * * RDISC 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. * * Rdisc 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 RDISC * 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 */ #include <stdio.h> #include <errno.h> #include <signal.h> #include <unistd.h> #include <stdlib.h> #include <sys/types.h> #include <sys/time.h> /* Do not use "improved" glibc version! */ #include <linux/limits.h> #include <sys/param.h> #include <sys/socket.h> #include <sys/file.h> #include <malloc.h> #include <sys/ioctl.h> #include <linux/if.h> #include <linux/route.h> #include <netinet/in.h> #include <netinet/ip.h> #include <netinet/ip_icmp.h> /* * The next include contains all defs and structures for multicast * that are not in SunOS 4.1.x. On a SunOS 4.1.x system none of this code * is ever used because it does not support multicast * Fraser Gardiner - Sun Microsystems Australia */ #include <netdb.h> #include <arpa/inet.h> #include <string.h> #include <syslog.h> #include "SNAPSHOT.h" struct interface { struct in_addr address; /* Used to identify the interface */ struct in_addr localaddr; /* Actual address if the interface */ int preference; int flags; struct in_addr bcastaddr; struct in_addr remoteaddr; struct in_addr netmask; int ifindex; char name[IFNAMSIZ]; }; /* * TBD * Use 255.255.255.255 for broadcasts - not the interface broadcast * address. */ #define ALLIGN(ptr) (ptr) static int join(int sock, struct sockaddr_in *sin); static void solicitor(struct sockaddr_in *); #ifdef RDISC_SERVER static void advertise(struct sockaddr_in *, int lft); #endif static char *pr_name(struct in_addr addr); static void pr_pack(char *buf, int cc, struct sockaddr_in *from); static void age_table(int time); static void record_router(struct in_addr router, int preference, int ttl); static void add_route(struct in_addr addr); static void del_route(struct in_addr addr); static void rtioctl(struct in_addr addr, int op); static int support_multicast(void); static int sendbcast(int s, char *packet, int packetlen); static int sendmcast(int s, char *packet, int packetlen, struct sockaddr_in *); static int sendbcastif(int s, char *packet, int packetlen, struct interface *ifp); static int sendmcastif(int s, char *packet, int packetlen, struct sockaddr_in *sin, struct interface *ifp); static int is_directly_connected(struct in_addr in); static void initlog(void); static void discard_table(void); static void init(void); #define ICMP_ROUTER_ADVERTISEMENT 9 #define ICMP_ROUTER_SOLICITATION 10 #define ALL_HOSTS_ADDRESS "224.0.0.1" #define ALL_ROUTERS_ADDRESS "224.0.0.2" #define MAXIFS 32 #if !defined(__GLIBC__) || __GLIBC__ < 2 /* For router advertisement */ struct icmp_ra { u_char icmp_type; /* type of message, see below */ u_char icmp_code; /* type sub code */ u_short icmp_cksum; /* ones complement cksum of struct */ u_char icmp_num_addrs; u_char icmp_wpa; /* Words per address */ short icmp_lifetime; }; struct icmp_ra_addr { __u32 ira_addr; __u32 ira_preference; }; #else #define icmp_ra icmp #endif /* Router constants */ #define MAX_INITIAL_ADVERT_INTERVAL 16 #define MAX_INITIAL_ADVERTISEMENTS 3 #define MAX_RESPONSE_DELAY 2 /* Not used */ /* Host constants */ #define MAX_SOLICITATIONS 3 #define SOLICITATION_INTERVAL 3 #define MAX_SOLICITATION_DELAY 1 /* Not used */ #define INELIGIBLE_PREF 0x80000000 /* Maximum negative */ #define MAX_ADV_INT 600 /* Statics */ static int num_interfaces; static struct interface *interfaces; static int interfaces_size; /* Number of elements in interfaces */ #define MAXPACKET 4096 /* max packet size */ /* fraser */ int debugfile; char usage[] = "Usage: rdisc [-b] [-d] [-s] [-v] [-f] [-a] [-V] [send_address] [receive_address]\n" #ifdef RDISC_SERVER " rdisc -r [-b] [-d] [-s] [-v] [-f] [-a] [-V] [-p <preference>] [-T <secs>] \n" " [send_address] [receive_address]\n" #endif ; int s; /* Socket file descriptor */ struct sockaddr_in whereto;/* Address to send to */ /* Common variables */ int verbose = 0; int debug = 0; int trace = 0; int solicit = 0; int ntransmitted = 0; int nreceived = 0; int forever = 0; /* Never give up on host. If 0 defer fork until * first response. */ #ifdef RDISC_SERVER /* Router variables */ int responder; int max_adv_int = MAX_ADV_INT; int min_adv_int; int lifetime; int initial_advert_interval = MAX_INITIAL_ADVERT_INTERVAL; int initial_advertisements = MAX_INITIAL_ADVERTISEMENTS; int preference = 0; /* Setable with -p option */ #endif /* Host variables */ int max_solicitations = MAX_SOLICITATIONS; unsigned int solicitation_interval = SOLICITATION_INTERVAL; int best_preference = 1; /* Set to record only the router(s) with the best preference in the kernel. Not set puts all routes in the kernel. */ static void graceful_finish(void); static void finish(void); static void timer(void); static void initifs(void); static u_short in_cksum(u_short *addr, int len); static int logging = 0; #define logerr(fmt...) ({ if (logging) syslog(LOG_ERR, fmt); \ else fprintf(stderr, fmt); }) #define logtrace(fmt...) ({ if (logging) syslog(LOG_INFO, fmt); \ else fprintf(stderr, fmt); }) #define logdebug(fmt...) ({ if (logging) syslog(LOG_DEBUG, fmt); \ else fprintf(stderr, fmt); }) static void logperror(char *str); static __inline__ int isbroadcast(struct sockaddr_in *sin) { return (sin->sin_addr.s_addr == INADDR_BROADCAST); } static __inline__ int ismulticast(struct sockaddr_in *sin) { return IN_CLASSD(ntohl(sin->sin_addr.s_addr)); } static void prusage(void) { (void) fprintf(stderr, usage); exit(1); } void do_fork(void) { int t; pid_t pid; if (trace) return; if ((pid=fork()) != 0) exit(0); for (t = 0; t < OPEN_MAX; t++) if (t != s) close(t); setsid(); initlog(); } void signal_setup(int signo, void (*handler)(void)) { struct sigaction sa; memset(&sa, 0, sizeof(sa)); sa.sa_handler = (void (*)(int))handler; #ifdef SA_INTERRUPT sa.sa_flags = SA_INTERRUPT; #endif sigaction(signo, &sa, NULL); } /* * M A I N */ char *sendaddress, *recvaddress; int main(int argc, char **argv) { struct sockaddr_in from; char **av = argv; struct sockaddr_in *to = &whereto; struct sockaddr_in joinaddr; sigset_t sset, sset_empty; #ifdef RDISC_SERVER int val; min_adv_int =( max_adv_int * 3 / 4); lifetime = (3*max_adv_int); #endif argc--, av++; while (argc > 0 && *av[0] == '-') { while (*++av[0]) { switch (*av[0]) { case 'd': debug = 1; break; case 't': trace = 1; break; case 'v': verbose++; break; case 's': solicit = 1; break; #ifdef RDISC_SERVER case 'r': responder = 1; break; #endif case 'a': best_preference = 0; break; case 'b': best_preference = 1; break; case 'f': forever = 1; break; case 'V': printf("rdisc utility, iputils-ss%s\n", SNAPSHOT); exit(0); #ifdef