usign-exec.c

   1 #include <stdbool.h>
   2 #include <string.h>
   3 #include <unistd.h>
   4 #include <sys/wait.h>
   5
   6 #include "usign.h"
   7
   8 int usign_v(const char *msgfile, const char *pubkeyfile,
   9             const char *pubkeydir, const char *sigfile, bool quiet) {
  10         pid_t pid;
  11         int status;
  12         const char *usign_argv[16] = {0};
  13         unsigned int usign_argc = 0;
  14
  15         usign_argv[usign_argc++] = "/usr/bin/usign";
  16         usign_argv[usign_argc++] = "-V";
  17         usign_argv[usign_argc++] = "-m";
  18         usign_argv[usign_argc++] = msgfile;
  19
  20         if (quiet)
  21                 usign_argv[usign_argc++] = "-q";
  22
  23         if (pubkeyfile) {
  24                 usign_argv[usign_argc++] = "-p";
  25                 usign_argv[usign_argc++] = pubkeyfile;
  26         }
  27
  28         if (pubkeydir) {
  29                 usign_argv[usign_argc++] = "-P";
  30                 usign_argv[usign_argc++] = pubkeydir;
  31         }
  32
  33         pid = fork();
  34         switch (pid) {
  35         case -1:
  36                 return -1;
  37
  38         case 0:
  39                 if (execv(usign_argv[0], usign_argv))
  40                         return -1;
  41
  42                 break;
  43
  44         default:
  45                 waitpid(pid, &status, 0);
  46                 return WEXITSTATUS(status);
  47         }
  48
  49         return -1;
  50 }
  51
  52 int usign_s(const char *msgfile, const char *seckeyfile, const char *sigfile, bool quiet) {
  53         pid_t pid;
  54         int status;
  55         const char *usign_argv[16] = {0};
  56         unsigned int usign_argc = 0;
  57
  58         usign_argv[usign_argc++] = "/usr/bin/usign";
  59         usign_argv[usign_argc++] = "-S";
  60         usign_argv[usign_argc++] = "-m";
  61         usign_argv[usign_argc++] = msgfile;
  62         usign_argv[usign_argc++] = "-s";
  63         usign_argv[usign_argc++] = seckeyfile;
  64         usign_argv[usign_argc++] = "-x";
  65         usign_argv[usign_argc++] = sigfile;
  66
  67         if (quiet)
  68                 usign_argv[usign_argc++] = "-q";
  69
  70         pid = fork();
  71         switch (pid) {
  72         case -1:
  73                 return -1;
  74
  75         case 0:
  76                 if (execv(usign_argv[0], usign_argv))
  77                         return -1;
  78
  79                 break;
  80
  81         default:
  82                 waitpid(pid, &status, 0);
  83                 return WEXITSTATUS(status);
  84         }
  85
  86         return -1;
  87 }
  88
  89 static int usign_f(char *fingerprint, const char *pubkeyfile, const char *seckeyfile, const char *sigfile) {
  90         int fds[2];
  91         pid_t pid;
  92         int status;
  93         const char *usign_argv[16] = {0};
  94         unsigned int usign_argc = 0;
  95
  96         if (pipe(fds))
  97                 return -1;
  98
  99         usign_argv[usign_argc++] = "/usr/bin/usign";
 100         usign_argv[usign_argc++] = "-F";
 101
 102         if (pubkeyfile) {
 103                 usign_argv[usign_argc++] = "-p";
 104                 usign_argv[usign_argc++] = pubkeyfile;
 105         }
 106
 107         if (seckeyfile) {
 108                 usign_argv[usign_argc++] = "-s";
 109                 usign_argv[usign_argc++] = seckeyfile;
 110         }
 111
 112         if (sigfile) {
 113                 usign_argv[usign_argc++] = "-x";
 114                 usign_argv[usign_argc++] = sigfile;
 115         }
 116
 117         pid = fork();
 118         switch (pid) {
 119         case -1:
 120                 return -1;
 121
 122         case 0:
 123                 dup2(fds[1], 1);
 124
 125                 close(0);
 126                 close(2);
 127                 close(fds[0]);
 128                 close(fds[1]);
 129
 130                 if (execv(usign_argv[0], usign_argv))
 131                         return -1;
 132
 133                 break;
 134
 135         default:
 136                 waitpid(pid, &status, 0);
 137                 if (fingerprint && !WEXITSTATUS(status)) {
 138                         memset(fingerprint, 0, 16);
 139                         read(fds[0], fingerprint, 16);
 140                         fingerprint[16] = '\0';
 141                 }
 142                 close(fds[0]);
 143                 close(fds[1]);
 144                 return WEXITSTATUS(status);
 145         }
 146
 147         return -1;
 148 }
 149
 150 int usign_f_pubkey(char *fingerprint, const char *pubkeyfile) {
 151         return usign_f(fingerprint, pubkeyfile, NULL, NULL);
 152 }
 153
 154 int usign_f_seckey(char *fingerprint, const char *seckeyfile) {
 155         return usign_f(fingerprint, NULL, seckeyfile, NULL);
 156 }
 157
 158 int usign_f_sig(char *fingerprint, const char *sigfile) {
 159         return usign_f(fingerprint, NULL, NULL, sigfile);
 160 }