Mercurial > hg > toybox

annotate lib/password.c @ 847:2506cbdccd20

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Partial cleanup of find - Remove unnecessary headers - dump_node is not used anywhere - exec_buf is unused - Replace SUCCESS with 1 and simplify code accordingly - a==0 -> !a - Simplify an incremation pattern using pre-increments - Add static keyword to functions - Make error messages print to stderr
author Felix Janda <felix.janda@posteo.de>
date Wed, 10 Apr 2013 19:25:06 +0200
parents 786841fdb1e0
children 77235d224b1d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 /* pwdutils.c - password read/update helper functions.
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2 *
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3 * Copyright 2012 Ashwini Kumar <ak.ashwini@gmail.com>
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4 */
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5
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6 #include "toys.h"
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7 #include <time.h>
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8
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9 int read_password(char * buff, int buflen, char* mesg)
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10 {
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11 int i = 0;
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12 struct termios termio, oldtermio;
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13 tcgetattr(0, &oldtermio);
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14 tcflush(0, TCIFLUSH);
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15 termio = oldtermio;
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17 termio.c_iflag &= ~(IUCLC|IXON|IXOFF|IXANY);
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18 termio.c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|TOSTOP);
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19 tcsetattr(0, TCSANOW, &termio);
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21 fputs(mesg, stdout);
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22 fflush(stdout);
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24 while (1) {
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25 int ret = read(0, &buff[i], 1);
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26 if ( ret < 0 ) {
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27 buff[0] = 0;
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28 tcsetattr(0, TCSANOW, &oldtermio);
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29 return 1;
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30 } else if (ret == 0 || buff[i] == '\n' || buff[i] == '\r' || buflen == i+1)
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31 {
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32 buff[i] = '\0';
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33 break;
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34 }
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35 i++;
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36 }
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37
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38 tcsetattr(0, TCSANOW, &oldtermio);
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39 puts("");
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40 fflush(stdout);
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41 return 0;
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42 }
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43
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44 static char *get_nextcolon(const char *line, char delim)
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45 {
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46 char *current_ptr = NULL;
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47 if((current_ptr = strchr(line, ':')) == NULL) error_exit("Invalid Entry\n");
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48 return current_ptr;
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49 }
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50
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9aeea680acc7 Use "_password" instead of "_passwd" for names in lib/password.c.
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51 int update_password(char *filename, char* username, char* encrypted)
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52 {
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53 char *filenamesfx = NULL, *namesfx = NULL;
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54 char *shadow = NULL, *sfx = NULL;
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55 FILE *exfp, *newfp;
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56 int ret = -1; //fail
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57 struct flock lock;
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58 char *line = NULL;
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59
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60 shadow = strstr(filename, "shadow");
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61 filenamesfx = xmsprintf("%s+", filename);
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62 sfx = strchr(filenamesfx, '+');
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64 exfp = fopen(filename, "r+");
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65 if(!exfp) {
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66 perror_msg("Couldn't open file %s",filename);
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67 goto free_storage;
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68 }
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70 *sfx = '-';
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71 ret = unlink(filenamesfx);
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72 ret = link(filename, filenamesfx);
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73 if(ret < 0) error_msg("can't create backup file");
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74
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75 *sfx = '+';
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76 lock.l_type = F_WRLCK;
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77 lock.l_whence = SEEK_SET;
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78 lock.l_start = 0;
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79 lock.l_len = 0;
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80
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81 ret = fcntl(fileno(exfp), F_SETLK, &lock);
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82 if(ret < 0) perror_msg("Couldn't lock file %s",filename);
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83
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84 lock.l_type = F_UNLCK; //unlocking at a later stage
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85
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86 newfp = fopen(filenamesfx, "w+");
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87 if(!newfp) {
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88 error_msg("couldn't open file for writing");
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89 ret = -1;
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90 fclose(exfp);
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91 goto free_storage;
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92 }
626
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93
694
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94 ret = 0;
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95 namesfx = xmsprintf("%s:",username);
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96 while((line = get_line(fileno(exfp))) != NULL)
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97 {
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98 if(strncmp(line, namesfx, strlen(namesfx)) != 0)
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99 fprintf(newfp, "%s\n", line);
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100 else {
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101 char *current_ptr = NULL;
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102 fprintf(newfp, "%s%s:",namesfx,encrypted);
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103 current_ptr = get_nextcolon(line, ':'); //past username
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104 current_ptr++; //past colon ':' after username
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105 current_ptr = get_nextcolon(current_ptr, ':'); //past passwd
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106 current_ptr++; //past colon ':' after passwd
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107 if(shadow) {
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108 fprintf(newfp, "%u:",(unsigned)(time(NULL))/(24*60*60));
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109 current_ptr = get_nextcolon(current_ptr, ':');
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110 current_ptr++; //past time stamp colon.
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111 fprintf(newfp, "%s\n",current_ptr);
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112 }
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113 else fprintf(newfp, "%s\n",current_ptr);
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114 }
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115
694
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116 free(line);
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117 }
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118 free(namesfx);
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119 fcntl(fileno(exfp), F_SETLK, &lock);
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120 fclose(exfp);
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121
694
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122 errno = 0;
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123 fflush(newfp);
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124 fsync(fileno(newfp));
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125 fclose(newfp);
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126 rename(filenamesfx, filename);
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127 if(errno) {
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128 perror_msg("File Writing/Saving failed: ");
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129 unlink(filenamesfx);
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130 ret = -1;
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131 }
626
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132
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133 free_storage:
694
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134 free(filenamesfx);
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135 return ret;
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136 }