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annotate toys/id.c @ 493:42a322adbd17

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update id to be SUS compliant * add -n and -G flag * allow a username to be given as argument * display complete list of groups * include it in default build
author Daniel Walter <d.walter@0x90.at>
date Tue, 21 Feb 2012 21:39:20 -0600
parents 74f152c5fa30
children 31215cc6c9f2
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 <sys/types.h>
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29 #include <pwd.h>
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30 #include <grp.h>
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31 #include "toys.h"
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32
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33 #define FLAG_n (1<<4)
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34 #define FLAG_G (1<<3)
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35 #define FLAG_g (1<<2)
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36 #define FLAG_r (1<<1)
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37 #define FLAG_u 1
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38
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39 void
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40 pretty_print(struct passwd *pw, struct group *grp, struct group **grps, int n)
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41 {
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42 int i;
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43 printf("uid= %d(%s) gid= %d(%s)", pw->pw_uid, pw->pw_name,
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44 grp->gr_gid, grp->gr_name);
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45 if (n) {
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46 printf(" groups= ");
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47 }
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48 for (i = 0; i < n; i++) {
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49 printf("%d(%s)%s", grps[i]->gr_gid, grps[i]->gr_name,
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50 (i < n-1) ? ",": "");
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51 }
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52 printf("\n");
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53 }
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54
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55 void id_main(void)
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56 {
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57 int flags = toys.optflags;
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58
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59 struct passwd *pw;
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60 struct group *grp;
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61 struct group **grps;
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62 uid_t uid;
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63 gid_t gid;
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64 gid_t *groups;
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65 int i;
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66 int ngroups;
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67 char *username;
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68
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69 /* check if a username is given */
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70 if (*toys.optargs) {
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71 username = *(toys.optargs);
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72 pw = getpwnam(username);
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73 if (!pw) {
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74 printf("id: %s: no such user\n", username);
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75 toys.exitval = 1;
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76 return;
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77 }
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78 uid = pw->pw_uid;
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79 gid = pw->pw_gid;
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80 } else {
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81 /* show effective, unless user specifies real */
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82 if (flags & FLAG_r) {
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83 uid = getuid();
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84 gid = getgid();
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85 } else {
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86 uid = geteuid();
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87 gid = getegid();
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88 }
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89 }
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90
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91 pw = getpwuid(uid);
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92 if (!pw) {
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93 perror("id");
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94 toys.exitval = 1;
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95 return;
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96 }
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97
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98 grp = getgrgid(pw->pw_gid);
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99 if (!grp) {
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100 perror("id");
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101 toys.exitval = 1;
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102 return;
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103 }
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104
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105 if (flags & FLAG_u) {
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106 if (flags & FLAG_n)
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107 printf("%s\n", pw->pw_name);
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108 else
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109 printf("%d\n", pw->pw_uid);
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110 return;
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111 }
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112 if (flags & FLAG_g) {
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113 if (flags & FLAG_n)
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114 printf("%s\n", grp->gr_name);
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115 else
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116 printf("%d\n", grp->gr_gid);
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117 return;
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118 }
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119
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120
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121 if (flags & FLAG_r) {
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122 printf("-r can only be used in combination with -u or -g\n");
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123 toys.exitval = 1;
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124 return;
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125 }
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126 ngroups = sysconf(_SC_NGROUPS_MAX);
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127 /* fallback for number of groups to 32 */
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128 if (ngroups < 0)
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129 ngroups = 32;
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130 groups = malloc(ngroups * sizeof(gid_t));
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131 if (!groups) {
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132 perror("id");
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133 toys.exitval = 1;
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134 return;
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135 }
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136 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) < 0) {
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137 perror("id");
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138 toys.exitval = 1;
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139 return;
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140 }
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141 grps = malloc(ngroups * sizeof(struct group *));
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142 for (i = 0; i < ngroups; i++) {
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143 struct group *tmp;
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144 grps[i] = malloc(sizeof(struct group));
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145 size_t f = sysconf(_SC_GETGR_R_SIZE_MAX);
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146 char *buf = malloc(f);
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147 if (getgrgid_r(groups[i], grps[i], buf, f, &tmp) < 0) {
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148 perror("id");
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149 continue;
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150 }
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151 if (tmp == NULL) {
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152 perror("id");
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153 continue;
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154 }
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155 }
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156
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157 if (flags & FLAG_G) {
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158 for (i = 0; i < ngroups; i++) {
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159 if (flags & FLAG_n)
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160 printf("%s%s", !i ? "" : " ", grps[i]->gr_name);
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
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161 else
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
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162 printf("%s%d", !i ? "" : " ", grps[i]->gr_gid);
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
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163 }
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
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164 printf("\n");
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
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165 return;
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
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166 }
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
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167
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
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168 pretty_print(pw, grp, grps, ngroups);
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
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169 for (i=0; i < ngroups; i++)
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
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170 free(grps[i]);
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Daniel Walter <d.walter@0x90.at>
parents: 430
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171
413
12add511705e Add id command from Tim Bird.
Rob Landley <rob@landley.net>
parents:
diff changeset
172 }