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annotate toys/pending/userdel.c @ 1776:7bf68329eb3b draft default tip

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Repository switched to git at https://github.com/landley/toybox
author Rob Landley <rob@landley.net>
date Thu, 09 Apr 2015 02:28:32 -0500
parents 5fac2769a159
children
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rev   line source
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Ashwini Sharma <ak.ashwini1981@gmail.com>
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1 /* userdel.c - delete a user
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2 *
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3 * Copyright 2014 Ashwini Kumar <ak.ashwini1981@gmail.com>
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4 *
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5 * See http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/userdel.html
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6
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7 USE_USERDEL(NEWTOY(userdel, "<1>1r", TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
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5fac2769a159 Redo option parsing infrastructure so #define FORCE_FLAGS can unzero flag macros for a disabled command (needed when multiple commands share infrastructure with a common set of flags).
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8 USE_USERDEL(OLDTOY(deluser, userdel, TOYFLAG_NEEDROOT|TOYFLAG_SBIN))
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9
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10 config USERDEL
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11 bool "userdel"
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12 default n
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13 help
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14 usage: userdel [-r] USER
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15 usage: deluser [-r] USER
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16
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17 Options:
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18 -r remove home directory
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19 Delete USER from the SYSTEM
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20 */
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21
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22 #define FOR_userdel
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23 #include "toys.h"
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24
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25 static void update_groupfiles(char *filename, char* username)
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26 {
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27 char *filenamesfx = NULL, *sfx = NULL, *line = NULL;
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28 FILE *exfp, *newfp;
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29 int ulen = strlen(username);
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30 struct flock lock;
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31
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32 filenamesfx = xmprintf("%s+", filename);
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33 sfx = strchr(filenamesfx, '+');
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34 exfp = xfopen(filename, "r+");
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35
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36 *sfx = '-';
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37 unlink(filenamesfx);
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38 if (link(filename, filenamesfx)) error_msg("Can't create backup file");
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39
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40 *sfx = '+';
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41 lock.l_type = F_WRLCK;
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42 lock.l_whence = SEEK_SET;
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43 lock.l_start = lock.l_len = 0;
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44
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45 if (fcntl(fileno(exfp), F_SETLK, &lock) < 0)
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46 perror_msg("Couldn't lock file %s",filename);
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47
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48 lock.l_type = F_UNLCK; //unlocking at a later stage
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49
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50 newfp = xfopen(filenamesfx, "w+");
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51
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52 while ((line = get_line(fileno(exfp))) != NULL){
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53 sprintf(toybuf, "%s:",username);
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54 if (!strncmp(line, toybuf, ulen+1)) goto LOOP;
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55 else {
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56 char *n, *p = strrchr(line, ':');
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57
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58 if (p && *++p && (n = strstr(p, username))) {
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59 do {
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60 if (n[ulen] == ',') {
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61 *n = '\0';
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62 n += ulen + 1;
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63 fprintf(newfp, "%s%s\n", line, n);
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64 break;
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65 } else if (!n[ulen]) {
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66 if (n[-1] == ',') n[-1] = *n = '\0';
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67 if (n[-1] == ':') *n = '\0';
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68 fprintf(newfp, "%s%s\n", line, n);
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69 break;
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70 } else n += ulen;
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71 } while (*n && (n=strstr(n, username)));
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72 if (!n) fprintf(newfp, "%s\n", line);
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73 } else fprintf(newfp, "%s\n", line);
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74 }
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75 LOOP:
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76 free(line);
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77 }
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78 fcntl(fileno(exfp), F_SETLK, &lock);
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79 fclose(exfp);
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80 errno = 0;
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81 fflush(newfp);
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82 fsync(fileno(newfp));
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83 fclose(newfp);
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84 rename(filenamesfx, filename);
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85 if (errno){
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86 perror_msg("File Writing/Saving failed: ");
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87 unlink(filenamesfx);
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88 }
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89 free(filenamesfx);
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90 }
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91
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92 void userdel_main(void)
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93 {
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94 struct passwd *pwd = NULL;
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95
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96 pwd = xgetpwnam(*toys.optargs);
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97 update_password("/etc/passwd", pwd->pw_name, NULL);
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98 update_password("/etc/shadow", pwd->pw_name, NULL);
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99
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100 // delete the group named USER, and remove user from group.
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101 // could update_password() be used for this?
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102 // not a good idea, as update_passwd() updates one entry at a time
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103 // in this case it will be modifying the files as many times the
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104 // USER appears in group database files. So the customized version
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105 // of update_passwd() is here.
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106 update_groupfiles("/etc/group", *toys.optargs);
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107 update_groupfiles("/etc/gshadow", *toys.optargs);
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108
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109 if (toys.optflags & FLAG_r) {
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110 char *arg[] = {"rm", "-fr", pwd->pw_dir, NULL, NULL};
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111
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112 sprintf(toybuf, "/var/spool/mail/%s",pwd->pw_name);
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113 arg[3] = toybuf;
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114 xexec(arg);
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115 }
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116 }