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annotate toys/id.c @ 587:82ffae226c40

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Convert another realpath use to xrealpath().
author Rob Landley <rob@landley.net>
date Fri, 01 Jun 2012 17:59:11 -0500
parents 60b97ba66a70
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /* vi: set sw=4 ts=4:
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2 *
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3 * id.c - print real and effective user and group IDs
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4 *
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5 * Copyright 2012 Sony Network Entertainment, Inc.
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6 *
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7 * by Tim Bird <tim.bird@am.sony.com>
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8 *
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9 * See http://www.opengroup.org/onlinepubs/009695399/utilities/id.html
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10
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11 USE_ID(NEWTOY(id, "nGgru", TOYFLAG_BIN))
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12
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13 config ID
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14 bool "id"
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15 default y
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16 help
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17 usage: id [-nGgru]
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18
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19 Print user and group ID.
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20
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21 -n print names instead of numeric IDs (to be used with -Ggu)
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22 -G Show only the group IDs
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23 -g Show only the effective group ID
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24 -r Show real ID instead of effective ID
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25 -u Show only the effective user ID
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26 */
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27
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28 #include "toys.h"
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29
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30 #define FLAG_n (1<<4)
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31 #define FLAG_G (1<<3)
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32 #define FLAG_g (1<<2)
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33 #define FLAG_r (1<<1)
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34 #define FLAG_u 1
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35
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36 static void s_or_u(char *s, unsigned u, int done)
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37 {
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38 if (toys.optflags & FLAG_n) printf("%s", s);
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39 else printf("%u", u);
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40 if (done) {
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41 xputc('\n');
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42 exit(0);
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43 }
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44 }
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45
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46 static void showid(char *header, unsigned u, char *s)
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47 {
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48 printf("%s%u(%s)", header, u, s);
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49 }
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50
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51 struct passwd *xgetpwuid(uid_t uid)
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52 {
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53 struct passwd *pwd = getpwuid(uid);
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54 if (!pwd) error_exit(NULL);
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55 return pwd;
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56 }
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57
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58 struct group *xgetgrgid(gid_t gid)
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59 {
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60 struct group *group = getgrgid(gid);
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61 if (!group) error_exit(NULL);
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62 return group;
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63 }
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64
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65 void id_main(void)
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66 {
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67 int flags = toys.optflags, i, ngroups;
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68 struct passwd *pw;
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69 struct group *grp;
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70 uid_t uid = getuid(), euid = geteuid();
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71 gid_t gid = getgid(), egid = getegid(), *groups;
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72
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73 /* check if a username is given */
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74 if (*toys.optargs) {
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75 if (!(pw = getpwnam(*toys.optargs)))
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76 error_exit("no such user '%s'", *toys.optargs);
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77 uid = euid = pw->pw_uid;
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78 gid = egid = pw->pw_gid;
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79 }
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80
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81 i = toys.optflags & FLAG_r;
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82 pw = xgetpwuid(i ? uid : euid);
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83 if (flags & FLAG_u) s_or_u(pw->pw_name, pw->pw_uid, 1);
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84
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85 grp = xgetgrgid(i ? gid : egid);
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86 if (flags & FLAG_g) s_or_u(grp->gr_name, grp->gr_gid, 1);
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87
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88 if (!(flags & FLAG_G)) {
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89 showid("uid=", pw->pw_uid, pw->pw_name);
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90 showid(" gid=", grp->gr_gid, grp->gr_name);
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91
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92 if (!i) {
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93 if (uid != euid) {
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94 pw = xgetpwuid(euid);
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95 showid(" euid=", pw->pw_uid, pw->pw_name);
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96 }
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97 if (gid != egid) {
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98 grp = xgetgrgid(egid);
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99 showid(" egid=", grp->gr_gid, grp->gr_name);
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100 }
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101 }
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102
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103 showid(" groups=", grp->gr_gid, grp->gr_name);
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104 }
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105
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106
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107 groups = (gid_t *)toybuf;
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108 if (0 >= (ngroups = getgroups(sizeof(toybuf)/sizeof(gid_t), groups)))
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109 perror_exit(0);
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110
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111 for (i = 0; i < ngroups; i++) {
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112 xputc(' ');
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113 if (!(grp = getgrgid(groups[i]))) perror_msg(0);
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114 else if (flags & FLAG_G)
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115 s_or_u(grp->gr_name, grp->gr_gid, 0);
60b97ba66a70 Extensive semi-gratuitous refactoring: factor out common code, handle euid!=uid and egid!=gid cases. (Note: test suite requires root access, possibly container support.)
Rob Landley <rob@landley.net>
parents: 542
diff changeset
116 else if (grp->gr_gid != egid) showid("", grp->gr_gid, grp->gr_name);
493
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
diff changeset
117 }
543
60b97ba66a70 Extensive semi-gratuitous refactoring: factor out common code, handle euid!=uid and egid!=gid cases. (Note: test suite requires root access, possibly container support.)
Rob Landley <rob@landley.net>
parents: 542
diff changeset
118 xputc('\n');
413
12add511705e Add id command from Tim Bird.
Rob Landley <rob@landley.net>
parents:
diff changeset
119 }