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[unix-history] / usr / src / usr.bin / netstat / main.c

#ifndef lint
static char sccsid[] = "@(#)main.c      4.2 82/10/06";
#endif

#include <sys/param.h>
#include <sys/pte.h>
#include <ctype.h>
#include <errno.h>
#include <netdb.h>
#include <nlist.h>
#include <stdio.h>

struct nlist nl[] = {
#define N_MBSTAT        0
       { "_mbstat" },
#define N_IPSTAT        1
       { "_ipstat" },
#define N_TCB           2
       { "_tcb" },
#define N_TCPSTAT       3
       { "_tcpstat" },
#define N_UDB           4
       { "_udb" },
#define N_UDPSTAT       5
       { "_udpstat" },
#define N_RAWCB         6
       { "_rawcb" },
#define N_SYSMAP        7
       { "_Sysmap" },
#define N_SYSSIZE       8
       { "_Syssize" },
#define N_IFNET         9
       { "_ifnet" },
#define N_HOSTS         10
       { "_hosts" },
#define N_RTHOST        11
       { "_rthost" },
#define N_RTNET         12
       { "_rtnet" },
       0,
};

struct protox {
       short   pr_index;       /* index into nlist of cb head */
       short   pr_wanted;      /* 1 if wanted, 0 otherwise */
       char    *pr_name;       /* well-known name */
} protox[] = {
       { N_TCB,        1,      "tcp" },
       { N_UDB,        1,      "udp" },
       { -1,           0,      0 }
};

struct  pte *Sysmap;

char    *system = "/vmunix";
char    *kmemf = "/dev/kmem";
int     kmem;
int     kflag;
int     Aflag;
int     aflag;
int     hflag;
int     iflag;
int     mflag;
int     nflag;
int     rflag;
int     sflag;
int     tflag;
int     interval;
char    usage[] = "[ -Aaihmnrst ] [ interval ] [ system ] [ core ]";

main(argc, argv)
       int argc;
       char *argv[];
{
       int i;
       char *cp, *name;
       register struct protoent *p;

       name = argv[0];
       argc--, argv++;
       while (argc > 0 && **argv == '-') {
               for (cp = &argv[0][1]; *cp; cp++)
               switch(argv[0][1]) {

               case 'A':
                       Aflag++;
                       break;

               case 'a':
                       aflag++;
                       break;

               case 'h':
                       hflag++;
                       break;

               case 'i':
                       iflag++;
                       break;

               case 'm':
                       mflag++;
                       break;

               case 'n':
                       nflag++;
                       break;

               case 'r':
                       rflag++;
                       break;

               case 's':
                       sflag++;
                       break;

               case 't':
                       tflag++;
                       break;

               default:
use:
                       printf("usage: %s %s\n", name, usage);
                       exit(1);
               }
               argv++, argc--;
       }
       if (argc > 0 && isdigit(argv[0][0])) {
               interval = atoi(argv[0]);
               if (interval <= 0)
                       goto use;
               argv++, argc--;
               iflag++;
       }
       if (argc > 0) {
               system = *argv;
               argv++, argc--;
       }
       nlist(system, nl);
       if (nl[0].n_type == 0) {
               fprintf(stderr, "%s: no namelist\n", system);
               exit(1);
       }
       if (argc > 0) {
               kmemf = *argv;
               kflag++;
       }
       kmem = open(kmemf, 0);
       if (kmem < 0) {
               fprintf(stderr, "cannot open ");
               perror(kmemf);
               exit(1);
       }
       if (kflag) {
               off_t off;

               off = nl[N_SYSMAP].n_value & 0x7fffffff;
               lseek(kmem, off, 0);
               nl[N_SYSSIZE].n_value *= 4;
               Sysmap = (struct pte *)malloc(nl[N_SYSSIZE].n_value);
               if (Sysmap == 0) {
                       perror("Sysmap");
                       exit(1);
               }
               read(kmem, Sysmap, nl[N_SYSSIZE].n_value);
       }
       if (mflag) {
               mbpr(nl[N_MBSTAT].n_value);
               exit(0);
       }
       /*
        * Keep file descriptors open to avoid overhead
        * of open/close on each call to get* routines.
        */
       sethostent(1);
       setnetent(1);
       if (iflag) {
               intpr(interval, nl[N_IFNET].n_value);
               exit(0);
       }
       if (hflag) {
               hostpr(nl[N_HOSTS].n_value);
               exit(0);
       }
       if (rflag) {
               routepr(nl[N_RTHOST].n_value, nl[N_RTNET].n_value);
               exit(0);
       }
       setprotoent(1);
       setservent(1);
       while (p = getprotoent()) {
               register struct protox *tp;

               for (tp = protox; tp->pr_index >= 0; tp++)
                       if (strcmp(tp->pr_name, p->p_name) == 0)
                               break;
               if (tp->pr_index < 0 || tp->pr_wanted == 0)
                       continue;
               protopr(nl[tp->pr_index].n_value, p->p_name);
       }
       endprotoent();
}

/*
* Seek into the kernel for a value.
*/
klseek(fd, base, off)
       int fd, base, off;
{

       if (kflag) {
               /* get kernel pte */
               base &= 0x7fffffff;
               base = Sysmap[base >> 9].pg_pfnum * 512 + (base & 0x1ff);
       }
       lseek(fd, base, off);
}