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annotate sqlickrypt.c @ 18:59ea628abb81

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sqlickrypt.c: add the ability to register new users. When sqlickrypt is run with the option "register", it expects a username, password, and email, and adds them to the database if the username is not already in use.
author John "Elwin" Edwards <elwin@sdf.org>
date Mon, 21 May 2012 21:40:56 -0700
parents d3e3d6b4016b
children 9d5da43c0e83
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #include <stdio.h>
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2 #include <stdlib.h>
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3 #include <string.h>
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4 #include <ctype.h>
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5 #include <sqlite3.h>
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6 #include <unistd.h>
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7 #include <crypt.h>
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8
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9 #define DATABASE "/dgldir/dgamelaunch.db"
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10 #define IBUFSIZE 200
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11
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12 int xcallback(void *targ, int ncols, char **vals, char **colnames) {
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13 char *pws;
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14 int j;
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15 pws = *((char **) targ);
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16 if (pws == NULL) {
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17 for (j = 0; j < ncols; j++) {
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18 if (!strcmp(colnames[j], "password"))
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19 *((char **) targ) = strdup(vals[j]);
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20 }
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21 }
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22 /* Otherwise, this isn't the first row. */
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23 return 0;
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24 }
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25
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26 /* Simple callback, for checking if there are any matches. */
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27 int searchcallback(void *targ, int ncols, char **vals, char **colnames) {
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28 *((int *) targ) = 1;
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29 return 0;
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30 }
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31
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32 int check(char *uname, char *pw) {
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33 char finduser_sql[160];
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34 char *pwhash = NULL, *comphash;
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35 int status;
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36 sqlite3 *db;
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37
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38 strcpy(finduser_sql, "SELECT * FROM dglusers WHERE username='");
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39 strncat(finduser_sql, uname, 40);
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40 strcat(finduser_sql, "';");
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41
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42 status = sqlite3_open(DATABASE, &db);
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43 if (status) {
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44 sqlite3_close(db);
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45 return 1;
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46 }
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47 sqlite3_exec(db, finduser_sql, xcallback, (void *) &pwhash, NULL);
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48
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49 sqlite3_close(db);
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50 /* Now check the password. */
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51 if (pwhash == NULL) {
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52 return 2;
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53 }
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54 comphash = crypt(pw, pwhash);
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55 if (!strcmp(pwhash, comphash))
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56 return 0;
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57 return 1;
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58 }
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60 int insertuser(char *uname, char *pw, char *email) {
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61 char finduser_sql[160];
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62 int status;
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63 sqlite3 *db;
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64
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65 strcpy(finduser_sql, "BEGIN; SELECT * FROM dglusers WHERE username='");
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66 strncat(finduser_sql, uname, 40);
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67 strcat(finduser_sql, "';");
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68
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69 status = sqlite3_open(DATABASE, &db);
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70 if (status) {
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71 sqlite3_close(db);
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72 return 1;
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73 }
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74 status = 0;
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75 sqlite3_exec(db, finduser_sql, searchcallback, (void *) &status, NULL);
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76 if (!status) {
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77 /* FIXME This is ugly, and email is unsanitzed. */
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78 strcpy(finduser_sql, "INSERT INTO dglusers (username, password, email) VALUES ('");
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79 strncat(finduser_sql, uname, 20);
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80 strcat(finduser_sql, "', '");
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81 strcat(finduser_sql, crypt(pw, pw));
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82 strcat(finduser_sql, "', '");
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83 strncat(finduser_sql, email, 40);
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84 strcat(finduser_sql, "');");
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85 sqlite3_exec(db, finduser_sql, NULL, NULL, NULL);
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86 }
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87 sqlite3_exec(db, "COMMIT;", NULL, NULL, NULL);
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88 sqlite3_close(db);
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89 return status;
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90 }
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91
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92 int main(int argc, char *argv[]) {
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93 char ibuf[IBUFSIZE], *uname, *pw, *email;
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94 char *cptr; // Utility pointer
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95 int status;
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96
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97 /* Read in the username and password */
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98 fgets(ibuf, IBUFSIZE, stdin);
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99 uname = ibuf;
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100 pw = strchr(uname, '\n');
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101 if (pw == NULL)
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102 exit(4); /* Truncated */
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103 *pw = '\0';
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104 pw++;
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105 fgets(pw, IBUFSIZE - (pw - ibuf), stdin);
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106 if (pw[strlen(pw) - 1] == '\n')
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107 pw[strlen(pw) - 1] = '\0';
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108 else
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109 exit(4); /* Truncated */
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110 if (argc > 1 && !strcmp(argv[1], "register")) {
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111 email = pw + strlen(pw) + 1;
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112 fgets(email, IBUFSIZE - (email - ibuf), stdin);
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113 if (email[strlen(email) - 1] == '\n')
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114 email[strlen(email) - 1] = '\0';
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115 else
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116 exit(4);
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117 for (cptr = email; *cptr != '\0'; cptr++) {
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118 if (!isalnum(*cptr) && !strchr("@._-", *cptr)) {
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119 exit(4);
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120 }
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121 }
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122 }
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123 /* Sanitize the username, because it gets put into a query. */
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124 for (cptr = uname; *cptr != '\0'; cptr++) {
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125 if (!isalnum(*cptr)) {
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126 exit(4);
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127 }
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128 }
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parents: 17
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129 if (argc == 1 || !strcmp(argv[1], "check"))
59ea628abb81 sqlickrypt.c: add the ability to register new users.
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parents: 17
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130 status = check(uname, pw);
59ea628abb81 sqlickrypt.c: add the ability to register new users.
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parents: 17
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131 else if (!strcmp(argv[1], "register")) {
59ea628abb81 sqlickrypt.c: add the ability to register new users.
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132 status = insertuser(uname, pw, email);
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parents: 17
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133 }
59ea628abb81 sqlickrypt.c: add the ability to register new users.
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parents: 17
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134 else
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135 status = 127;
59ea628abb81 sqlickrypt.c: add the ability to register new users.
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136 return status;
59ea628abb81 sqlickrypt.c: add the ability to register new users.
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parents: 17
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137 }