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annotate toys/pending/groupadd.c @ 1396:e0c9c5424864 draft

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Isaac Dunham spotted that dhcp was also reimplementing daemon().
author Rob Landley <rob@landley.net>
date Sun, 20 Jul 2014 21:34:49 -0500
parents 0752b2d58909
children ed28d4d9558d
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1 /* groupadd.c - create a new group
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2 *
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3 * Copyright 2013 Ashwini Kumar <ak.ashwini@gmail.com>
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4 * Copyright 2013 Kyungwan Han <asura321@gmail.com>
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5 *
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6 * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/groupadd.html
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7
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8 USE_GROUPADD(NEWTOY(groupadd, "<1>2g#<0S", TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
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9 USE_GROUPADD(OLDTOY(addgroup, groupadd, OPTSTR_groupadd, TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
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10
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11 config GROUPADD
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12 bool "groupadd"
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13 default n
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14 help
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15 usage: groupadd [-S] [-g GID] [USER] GROUP
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16
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17 Add a group or add a user to a group
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18
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19 -g GID Group id
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20 -S Create a system group
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21 */
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22
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23 #define FOR_groupadd
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24 #include "toys.h"
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25
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26 #define GROUP_PATH "/etc/group"
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27 #define SECURE_GROUP_PATH "/etc/gshadow"
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28
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29 GLOBALS(
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30 long gid;
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31 )
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32
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33 /* Add a new group to the system, if GID is given then that is validated
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34 * to be free, else a free GID is choosen by self.
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35 * SYSTEM IDs are considered in the range 100 ... 999
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36 * update_group(), updates the entries in /etc/group, /etc/gshadow files
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37 */
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38 static void new_group()
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39 {
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40 char *entry = NULL;
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41 int max = INT_MAX;
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42
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43 if (toys.optflags & FLAG_g) {
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44 if (TT.gid > INT_MAX) error_exit("gid should be less than '%d' ", INT_MAX);
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45 if (getgrgid(TT.gid)) error_exit("group '%ld' is in use", TT.gid);
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46 } else {
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47 if (toys.optflags & FLAG_S) {
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48 TT.gid = SYS_FIRST_ID;
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49 max = SYS_LAST_ID;
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50 } else {
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51 TT.gid = SYS_LAST_ID + 1; //i.e. starting from 1000
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52 max = 60000; // as per config file on Linux desktop
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53 }
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54 //find unused gid
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55 while (TT.gid <= max) {
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56 if (!getgrgid(TT.gid)) break;
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57 if (TT.gid == max) error_exit("no more free gids left");
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58 TT.gid++;
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59 }
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60 }
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61
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62 entry = xmprintf("%s:%s:%d:", *toys.optargs, "x", TT.gid);
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63 update_password(GROUP_PATH, *toys.optargs, entry);
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64 free(entry);
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65 entry = xmprintf("%s:%s::", *toys.optargs, "!");
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66 update_password(SECURE_GROUP_PATH, *toys.optargs, entry);
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67 free(entry);
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68 }
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69
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70 void groupadd_main(void)
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71 {
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72 struct group *grp = NULL;
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73 char *entry = NULL;
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74
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75 if (toys.optflags && toys.optc == 2) {
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76 toys.exithelp = 1;
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77 error_exit("options, user and group can't be together");
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78 }
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79
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80 if (toys.optc == 2) { //add user to group
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81 //toys.optargs[0]- user, toys.optargs[1] - group
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82 xgetpwnam(*toys.optargs);
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83 if (!(grp = getgrnam(toys.optargs[1])))
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84 error_exit("group '%s' does not exist", toys.optargs[1]);
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85 if (!grp->gr_mem) entry = xmprintf("%s", *toys.optargs);
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86 else {
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87 int i;
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88
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89 for (i = 0; grp->gr_mem[i]; i++)
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90 if (!strcmp(grp->gr_mem[i], *toys.optargs)) return;
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91
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92 entry = xstrdup("");
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93 for (i=0; grp->gr_mem[i]; i++) {
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94 entry = xrealloc(entry, strlen(entry) + strlen(grp->gr_mem[i]) + 2);
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95 strcat(entry, grp->gr_mem[i]);
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96 strcat(entry, ",");
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97 }
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98 entry = xrealloc(entry, strlen(entry) + strlen(*toys.optargs) + 1);
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99 strcat(entry, *toys.optargs);
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100 }
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101 update_password(GROUP_PATH, grp->gr_name, entry);
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102 update_password(SECURE_GROUP_PATH, grp->gr_name, entry);
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103 free(entry);
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104 } else { //new group to be created
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105 /* investigate the group to be created */
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106 if ((grp = getgrnam(*toys.optargs)))
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107 error_exit("group '%s' is in use", *toys.optargs);
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108 setlocale(LC_ALL, "C");
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109 is_valid_username(*toys.optargs);
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110 new_group();
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111 }
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112 }