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annotate toys/id.c @ 533:31215cc6c9f2

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Consolidate headers.
author Rob Landley <rob@landley.net>
date Wed, 07 Mar 2012 19:04:50 -0600
parents 42a322adbd17
children 06763d1a2f9d
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
533
31215cc6c9f2 Consolidate headers.
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36 void pretty_print(struct passwd *pw, struct group *grp, struct group **grps,
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37 int n)
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38 {
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39 int i;
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40 printf("uid= %d(%s) gid= %d(%s)", pw->pw_uid, pw->pw_name,
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41 grp->gr_gid, grp->gr_name);
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42 if (n) {
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43 printf(" groups= ");
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44 }
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45 for (i = 0; i < n; i++) {
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46 printf("%d(%s)%s", grps[i]->gr_gid, grps[i]->gr_name,
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47 (i < n-1) ? ",": "");
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48 }
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49 printf("\n");
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50 }
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51
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52 void id_main(void)
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53 {
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54 int flags = toys.optflags;
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55
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56 struct passwd *pw;
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57 struct group *grp;
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58 struct group **grps;
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59 uid_t uid;
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60 gid_t gid;
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61 gid_t *groups;
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62 int i;
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63 int ngroups;
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64 char *username;
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65
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66 /* check if a username is given */
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67 if (*toys.optargs) {
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68 username = *(toys.optargs);
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69 pw = getpwnam(username);
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70 if (!pw) {
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71 printf("id: %s: no such user\n", username);
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72 toys.exitval = 1;
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73 return;
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74 }
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75 uid = pw->pw_uid;
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76 gid = pw->pw_gid;
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77 } else {
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78 /* show effective, unless user specifies real */
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79 if (flags & FLAG_r) {
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80 uid = getuid();
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81 gid = getgid();
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82 } else {
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83 uid = geteuid();
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84 gid = getegid();
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85 }
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86 }
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87
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88 pw = getpwuid(uid);
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89 if (!pw) {
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90 perror("id");
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91 toys.exitval = 1;
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92 return;
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93 }
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94
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95 grp = getgrgid(pw->pw_gid);
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96 if (!grp) {
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97 perror("id");
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98 toys.exitval = 1;
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99 return;
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100 }
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101
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102 if (flags & FLAG_u) {
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103 if (flags & FLAG_n)
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104 printf("%s\n", pw->pw_name);
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105 else
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106 printf("%d\n", pw->pw_uid);
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107 return;
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108 }
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109 if (flags & FLAG_g) {
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110 if (flags & FLAG_n)
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111 printf("%s\n", grp->gr_name);
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112 else
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113 printf("%d\n", grp->gr_gid);
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114 return;
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115 }
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116
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117
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118 if (flags & FLAG_r) {
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119 printf("-r can only be used in combination with -u or -g\n");
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120 toys.exitval = 1;
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121 return;
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122 }
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123 ngroups = sysconf(_SC_NGROUPS_MAX);
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124 /* fallback for number of groups to 32 */
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125 if (ngroups < 0)
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126 ngroups = 32;
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127 groups = malloc(ngroups * sizeof(gid_t));
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128 if (!groups) {
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129 perror("id");
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130 toys.exitval = 1;
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131 return;
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132 }
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133 if (getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups) < 0) {
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134 perror("id");
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135 toys.exitval = 1;
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136 return;
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137 }
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138 grps = malloc(ngroups * sizeof(struct group *));
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139 for (i = 0; i < ngroups; i++) {
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140 struct group *tmp;
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141 grps[i] = malloc(sizeof(struct group));
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142 size_t f = sysconf(_SC_GETGR_R_SIZE_MAX);
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143 char *buf = malloc(f);
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144 if (getgrgid_r(groups[i], grps[i], buf, f, &tmp) < 0) {
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145 perror("id");
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146 continue;
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147 }
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148 if (tmp == NULL) {
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149 perror("id");
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150 continue;
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151 }
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152 }
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153
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154 if (flags & FLAG_G) {
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155 for (i = 0; i < ngroups; i++) {
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156 if (flags & FLAG_n)
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157 printf("%s%s", !i ? "" : " ", grps[i]->gr_name);
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158 else
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159 printf("%s%d", !i ? "" : " ", grps[i]->gr_gid);
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160 }
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
diff changeset
161 printf("\n");
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
diff changeset
162 return;
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
diff changeset
163 }
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
diff changeset
164
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
diff changeset
165 pretty_print(pw, grp, grps, ngroups);
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
diff changeset
166 for (i=0; i < ngroups; i++)
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
diff changeset
167 free(grps[i]);
42a322adbd17 update id to be SUS compliant
Daniel Walter <d.walter@0x90.at>
parents: 430
diff changeset
168
413
12add511705e Add id command from Tim Bird.
Rob Landley <rob@landley.net>
parents:
diff changeset
169 }