1 /* 2 * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 3 * Use is subject to license terms. 4 */ 5 6 /* Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */ 7 /* All Rights Reserved */ 8 9 10 /* 11 * Copyright (c) 1980 Regents of the University of California. 12 * All rights reserved. The Berkeley software License Agreement 13 * specifies the terms and conditions for redistribution. 14 */ 15 16 #pragma ident "%Z%%M% %I% %E% SMI" 17 18 /* 19 * groups 20 */ 21 22 #include <sys/types.h> 23 #include <sys/param.h> 24 #include <grp.h> 25 #include <pwd.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <unistd.h> 29 #include <string.h> 30 31 static void showgroups(char *user); 32 33 int 34 main(int argc, char *argv[]) 35 { 36 int ngroups, i; 37 char *sep = ""; 38 struct group *gr; 39 gid_t groups[NGROUPS_UMAX]; 40 41 if (argc > 1) { 42 for (i = 1; i < argc; i++) 43 showgroups(argv[i]); 44 exit(0); 45 } 46 47 ngroups = getgroups(NGROUPS_UMAX, groups); 48 if (getpwuid(getuid()) == NULL) { 49 (void) fprintf(stderr, "groups: could not find passwd entry\n"); 50 exit(1); 51 } 52 53 for (i = 0; i < ngroups; i++) { 54 gr = getgrgid(groups[i]); 55 if (gr == NULL) { 56 (void) printf("%s%ld", sep, groups[i]); 57 sep = " "; 58 continue; 59 } 60 (void) printf("%s%s", sep, gr->gr_name); 61 sep = " "; 62 } 63 64 (void) printf("\n"); 65 return (0); 66 } 67 68 static void 69 showgroups(char *user) 70 { 71 struct group *gr; 72 struct passwd *pw; 73 char **cp; 74 char *sep = ""; 75 int pwgid_printed = 0; 76 77 if ((pw = getpwnam(user)) == NULL) { 78 (void) fprintf(stderr, "groups: %s : No such user\n", user); 79 return; 80 } 81 setgrent(); 82 (void) printf("%s : ", user); 83 while (gr = getgrent()) { 84 if (pw->pw_gid == gr->gr_gid) { 85 /* 86 * To avoid duplicate group entries 87 */ 88 if (pwgid_printed == 0) { 89 (void) printf("%s%s", sep, gr->gr_name); 90 sep = " "; 91 pwgid_printed = 1; 92 } 93 continue; 94 } 95 for (cp = gr->gr_mem; cp && *cp; cp++) 96 if (strcmp(*cp, user) == 0) { 97 (void) printf("%s%s", sep, gr->gr_name); 98 sep = " "; 99 break; 100 } 101 } 102 (void) printf("\n"); 103 endgrent(); 104 } 105