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annotate toys/other/mkpasswd.c @ 1727:c0ef9b7976f0 draft

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Use xsignal() instead of signal().
author Rob Landley <rob@landley.net>
date Tue, 10 Mar 2015 11:07:28 -0500
parents def326708e49
children
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1 /* mkpasswd.c - encrypt the given passwd using salt
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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 * No Standard
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7
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8 USE_MKPASSWD(NEWTOY(mkpasswd, ">2S:m:P#=0<0", TOYFLAG_USR|TOYFLAG_BIN))
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9
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10 config MKPASSWD
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11 bool "mkpasswd"
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12 default y
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13 help
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14 usage: mkpasswd [-P FD] [-m TYPE] [-S SALT] [PASSWORD] [SALT]
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15
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16 Crypt PASSWORD using crypt(3)
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17
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18 -P FD Read password from file descriptor FD
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19 -m TYPE Encryption method (des, md5, sha256, or sha512; default is des)
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20 -S SALT
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21 */
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22
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23 #define FOR_mkpasswd
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24 #include "toys.h"
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25
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26 GLOBALS(
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27 long pfd;
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28 char *method;
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29 char *salt;
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30 )
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31
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32 void mkpasswd_main(void)
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33 {
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34 char salt[MAX_SALT_LEN] = {0,};
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35 int i;
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36
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37 if (!TT.method) TT.method = "des";
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38 if (toys.optc == 2) {
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39 if (TT.salt) error_exit("duplicate salt");
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40 TT.salt = toys.optargs[1];
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41 }
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42
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43 if (-1 == (i = get_salt(salt, TT.method))) error_exit("bad -m");
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44 if (TT.salt) {
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45 char *s = TT.salt;
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46
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47 // In C locale, isalnum() means [A-Za-Z0-0]
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48 while (isalnum(*s) || *s == '.' || *s == '/') s++;
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49 if (*s) error_exit("salt not in [./A-Za-z0-9]");
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50
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51 snprintf(salt+i, sizeof(salt)-i, "%s", TT.salt);
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52 }
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53
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54 // Because read_password() doesn't have an fd argument
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55 if (TT.pfd) {
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56 if (dup2(TT.pfd, 0) == -1) perror_exit("fd");
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57 close(TT.pfd);
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58 }
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59
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60 // If we haven't got a password on the command line, read it from tty or FD
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61 if (!*toys.optargs) {
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62 // Prompt and read interactively?
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63 if (isatty(0)) {
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64 if (read_password(toybuf, sizeof(toybuf), "Password: "))
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65 perror_exit("password read failed");
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66 } else {
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67 for (i = 0; i<sizeof(toybuf)-1; i++) {
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68 if (!xread(0, toybuf+i, 1)) break;
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69 if (toybuf[i] == '\n' || toybuf[i] == '\r') break;
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70 }
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71 toybuf[i] = 0;
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72 }
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73 }
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74
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75 // encrypt & print the password
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76 xprintf("%s\n",crypt(*toys.optargs ? *toys.optargs : toybuf, salt));
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77 }