111 lines
2.4 KiB
C
111 lines
2.4 KiB
C
char prwtmp_c_rcs_id[] =
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"$Id: prwtmp.c,v 1.2 1998-05-28 16:18:21 hjp Exp $";
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/*
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* prwtmp - print wtmp to stdout
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*
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* $Log: prwtmp.c,v $
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* Revision 1.2 1998-05-28 16:18:21 hjp
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* use GNUmakerules/GNUmakevars for CC and INSTALL.
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* Bug fix: initial offset wasn't initialized
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* Bug fix: #include <unistd.h> and a cast (both needed for glibc2)
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*
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* Revision 1.1 1997/01/13 14:59:40 hjp
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* Checked into CVS.
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* Added -o and -s options.
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*
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*/
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <utmp.h>
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char *cmnd;
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void usage(void) {
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fprintf(stderr, "Usage: %s [-o] [-s start] [file]\n", cmnd);
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exit(1);
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}
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int main (int argc, char **argv) {
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FILE *fp;
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struct utmp u;
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char *filename = WTMP_FILE;
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long off = 0;
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int print_offset = 0;
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int c;
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char *p;
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cmnd = argv[0];
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while ((c = getopt(argc, argv, "s:o")) != EOF) {
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switch(c) {
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case 's':
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off = strtoul(optarg, &p, 0);
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if (p == optarg || *p != '\0') usage();
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break;
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case 'o':
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print_offset = 1;
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break;
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case '?':
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usage();
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default:
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assert(0);
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}
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}
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if (argc > optind) filename = argv[optind];
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fp = fopen(filename, "rb");
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if (!fp) {
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fprintf(stderr, "%s: cannot open %s: %s\n",
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cmnd, filename, strerror(errno));
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exit(1);
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}
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if (fseek(fp, off, SEEK_SET) == -1) {
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fprintf(stderr, "%s: cannot seek to %ld on %s: %s\n",
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cmnd, off, filename, strerror(errno));
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exit(1);
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}
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while (fread(&u, (int)sizeof(u), 1, fp) == 1) {
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char tbuf[20];
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if (print_offset) printf ("%8ld: ", off);
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off += sizeof(u);
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strftime(tbuf, (int)sizeof(tbuf), "%Y-%m-%d %H:%M:%S",
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localtime(&u.ut_time));
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printf("%s ", tbuf);
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printf("%-*.*s ",
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(int)sizeof(u.ut_user),
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(int)sizeof(u.ut_user),
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u.ut_user);
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printf("%-*.*s ",
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(int)sizeof(u.ut_id),
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(int)sizeof(u.ut_id),
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u.ut_id);
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printf("%-*.*s ",
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(int)sizeof(u.ut_line),
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(int)sizeof(u.ut_line),
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u.ut_line);
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printf("%5d ", (int)u.ut_pid); /* PID is typically < 30000 */
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printf("%5d ", (int)u.ut_type); /* short on HP-UX */
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printf("%5d ", (int)u.ut_exit.e_termination); /* short on HP-UX */
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printf("%5d ", (int)u.ut_exit.e_exit); /* short on HP-UX */
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printf("%-*.*s ",
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(int)sizeof(u.ut_host),
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(int)sizeof(u.ut_host),
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u.ut_host);
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printf("%08lx", (unsigned long)u.ut_addr);
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printf("\n");
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}
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return 0;
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}
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