/* $OpenBSD: who.c,v 1.17 2004/08/18 21:24:27 jmc Exp $ */ /* $NetBSD: who.c,v 1.4 1994/12/07 04:28:49 jtc Exp $ */ /* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Michael Fischbein. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef lint static char copyright[] = "@(#) Copyright (c) 1989, 1993\n\ The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint #if 0 static char sccsid[] = "@(#)who.c 8.1 (Berkeley) 6/6/93"; #endif static char rcsid[] = "$OpenBSD: who.c,v 1.17 2004/08/18 21:24:27 jmc Exp $"; #endif /* not lint */ #include #include #include #include #include #include #include #include #include #include #include #include void output(struct utmp *); void output_labels(void); void who_am_i(FILE *); void usage(void); FILE *file(char *); int only_current_term; /* show info about the current terminal only */ int show_term; /* show term state */ int show_idle; /* show idle time */ int show_labels; /* show column labels */ int show_quick; /* quick, names only */ #define NAME_WIDTH 8 #define HOST_WIDTH 32 int main(int argc, char *argv[]) { struct utmp usr; FILE *ufp; int c; setlocale(LC_ALL, ""); only_current_term = show_term = show_idle = show_labels = 0; show_quick = 0; while ((c = getopt(argc, argv, "HmqTu")) != -1) { switch (c) { case 'H': show_labels = 1; break; case 'm': only_current_term = 1; break; case 'q': show_quick = 1; break; case 'T': show_term = 1; break; case 'u': show_idle = 1; break; default: usage(); /* NOTREACHED */ } } argc -= optind; argv += optind; if (show_quick) { only_current_term = show_term = show_idle = show_labels = 0; } if (show_labels) output_labels(); switch (argc) { case 0: /* who */ ufp = file(_PATH_UTMP); if (only_current_term) { who_am_i(ufp); } else if (show_quick) { int count = 0; while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) { if (*usr.ut_name && *usr.ut_line) { (void)printf("%-*.*s ", NAME_WIDTH, UT_NAMESIZE, usr.ut_name); if ((++count % 8) == 0) (void) printf("\n"); } } if (count % 8) (void) printf("\n"); (void) printf ("# users=%d\n", count); } else { /* only entries with both name and line fields */ while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) if (*usr.ut_name && *usr.ut_line) output(&usr); } break; case 1: /* who utmp_file */ ufp = file(*argv); if (only_current_term) { who_am_i(ufp); } else if (show_quick) { int count = 0; while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) { if (*usr.ut_name && *usr.ut_line) { (void)printf("%-*.*s ", NAME_WIDTH, UT_NAMESIZE, usr.ut_name); if ((++count % 8) == 0) (void) printf("\n"); } } if (count % 8) (void) printf("\n"); (void) printf ("# users=%d\n", count); } else { /* all entries */ while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) output(&usr); } break; case 2: /* who am i */ ufp = file(_PATH_UTMP); who_am_i(ufp); break; default: usage(); /* NOTREACHED */ } exit(0); } void who_am_i(FILE *ufp) { struct utmp usr; struct passwd *pw; char *p; char *t; /* search through the utmp and find an entry for this tty */ if ((p = ttyname(0))) { /* strip any directory component */ if ((t = strrchr(p, '/'))) p = t + 1; while (fread((char *)&usr, sizeof(usr), 1, ufp) == 1) if (*usr.ut_name && !strcmp(usr.ut_line, p)) { output(&usr); return; } /* well, at least we know what the tty is */ (void)strncpy(usr.ut_line, p, UT_LINESIZE); } else (void)strncpy(usr.ut_line, "tty??", UT_LINESIZE); pw = getpwuid(getuid()); (void)strncpy(usr.ut_name, pw ? pw->pw_name : "?", UT_NAMESIZE); (void)time(&usr.ut_time); *usr.ut_host = '\0'; output(&usr); } void output(struct utmp *up) { struct stat sb; char line[sizeof(_PATH_DEV) + sizeof (up->ut_line)]; char state = '?'; static time_t now = 0; time_t idle = 0; if (show_term || show_idle) { if (now == 0) time(&now); memset(line, 0, sizeof line); strlcpy(line, _PATH_DEV, sizeof line); strlcat(line, up->ut_line, sizeof line); if (stat(line, &sb) == 0) { state = (sb.st_mode & 020) ? '+' : '-'; idle = now - sb.st_atime; } else { state = '?'; idle = 0; } } (void)printf("%-*.*s ", NAME_WIDTH, UT_NAMESIZE, up->ut_name); if (show_term) { (void)printf("%c ", state); } (void)printf("%-*.*s ", UT_LINESIZE, UT_LINESIZE, up->ut_line); (void)printf("%.12s ", ctime(&up->ut_time) + 4); if (show_idle) { if (idle < 60) (void)printf(" . "); else if (idle < (24 * 60 * 60)) (void)printf("%02d:%02d ", (idle / (60 * 60)), (idle % (60 * 60)) / 60); else (void)printf(" old "); } if (*up->ut_host) printf(" (%.*s)", HOST_WIDTH, up->ut_host); (void)putchar('\n'); } void output_labels(void) { (void)printf("%-*.*s ", NAME_WIDTH, UT_NAMESIZE, "USER"); if (show_term) (void)printf("S "); (void)printf("%-*.*s ", UT_LINESIZE, UT_LINESIZE, "LINE"); (void)printf("WHEN "); if (show_idle) (void)printf("IDLE "); (void)printf(" %.*s", HOST_WIDTH, "FROM"); (void)putchar('\n'); } FILE * file(char *name) { FILE *ufp; if (!(ufp = fopen(name, "r"))) { err(1, "%s", name); /* NOTREACHED */ } return(ufp); } void usage(void) { (void)fprintf(stderr, "usage: who [-HmqTu] [file]\n who am i\n"); exit(1); }