Fix return code of write_file()

[oweals/ucert.git] / usign-exec.c

diff --git a/usign-exec.c b/usign-exec.c
index fe24f69b9f263e372cccdb9fa2953f057e02acf8..7f6106580b166ca110f0f0e10bce0ff54a7f9cd6 100644 (file)
--- a/usign-exec.c
+++ b/usign-exec.c
@@ -20,13 +20,41 @@
 
 #include "usign.h"
 
+#ifdef UCERT_HOST_BUILD
+#define USIGN_EXEC "usign"
+#else
+#define USIGN_EXEC "/usr/bin/usign"
+#endif
+
+/*
+ * check for revoker deadlink in pubkeydir
+ * return true if a revoker exists, false otherwise
+ */
+int _usign_key_is_revoked(const char *fingerprint, const char *pubkeydir) {
+       char tml[64] = {0};
+       char rfname[256] = {0};
+
+       snprintf(rfname, sizeof(rfname)-1, "%s/%s", pubkeydir, fingerprint);
+       if (readlink(rfname, tml, sizeof(tml)) > 0 &&
+           !strcmp(tml, ".revoked.")) {
+               return true;
+       };
+
+       return false;
+}
+
+#ifdef UCERT_FULL
+/*
+ * call usign -S ...
+ * return WEXITSTATUS or -1 if fork or execv fails
+ */
 int usign_s(const char *msgfile, const char *seckeyfile, const char *sigfile, bool quiet) {
        pid_t pid;
        int status;
        const char *usign_argv[16] = {0};
        unsigned int usign_argc = 0;
 
-       usign_argv[usign_argc++] = "/usr/bin/usign";
+       usign_argv[usign_argc++] = USIGN_EXEC;
        usign_argv[usign_argc++] = "-S";
        usign_argv[usign_argc++] = "-m";
        usign_argv[usign_argc++] = msgfile;
@@ -44,7 +72,13 @@ int usign_s(const char *msgfile, const char *seckeyfile, const char *sigfile, bo
                return -1;
 
        case 0:
-               if (execv(usign_argv[0], usign_argv))
+               if (
+#ifdef UCERT_HOST_BUILD
+                       execvp(usign_argv[0], (char *const *)usign_argv)
+#else
+                       execv(usign_argv[0], (char *const *)usign_argv)
+#endif
+                  )
                        return -1;
 
                break;
@@ -56,7 +90,16 @@ int usign_s(const char *msgfile, const char *seckeyfile, const char *sigfile, bo
 
        return -1;
 }
+#else
+int usign_s(const char *msgfile, const char *seckeyfile, const char *sigfile, bool quiet) {
+       return -1;
+};
+#endif
 
+/*
+ * call usign -F ... and set fingerprint returned
+ * return WEXITSTATUS or -1 if fork or execv fails
+ */
 static int usign_f(char *fingerprint, const char *pubkeyfile, const char *seckeyfile, const char *sigfile) {
        int fds[2];
        pid_t pid;
@@ -67,7 +110,7 @@ static int usign_f(char *fingerprint, const char *pubkeyfile, const char *seckey
        if (pipe(fds))
                return -1;
 
-       usign_argv[usign_argc++] = "/usr/bin/usign";
+       usign_argv[usign_argc++] = USIGN_EXEC;
        usign_argv[usign_argc++] = "-F";
 
        if (pubkeyfile) {
@@ -98,51 +141,64 @@ static int usign_f(char *fingerprint, const char *pubkeyfile, const char *seckey
                close(fds[0]);
                close(fds[1]);
 
-               if (execv(usign_argv[0], usign_argv))
+               if (
+#ifdef UCERT_HOST_BUILD
+                   execvp(usign_argv[0], (char *const *)usign_argv)
+#else
+                   execv(usign_argv[0], (char *const *)usign_argv)
+#endif
+                  )
                        return -1;
 
                break;
 
        default:
                waitpid(pid, &status, 0);
+               status = WEXITSTATUS(status);
                if (fingerprint && !WEXITSTATUS(status)) {
-                       memset(fingerprint, 0, 16);
-                       read(fds[0], fingerprint, 16);
+                       ssize_t r;
+                       memset(fingerprint, 0, 17);
+                       r = read(fds[0], fingerprint, 17);
+                       if (r < 16)
+                               status = -1;
+
                        fingerprint[16] = '\0';
+
                }
                close(fds[0]);
                close(fds[1]);
-               return WEXITSTATUS(status);
+               return status;
        }
 
        return -1;
 }
 
+/*
+ * call usign -F -p ...
+ */
 int usign_f_pubkey(char *fingerprint, const char *pubkeyfile) {
        return usign_f(fingerprint, pubkeyfile, NULL, NULL);
 }
 
+/*
+ * call usign -F -s ...
+ */
 int usign_f_seckey(char *fingerprint, const char *seckeyfile) {
        return usign_f(fingerprint, NULL, seckeyfile, NULL);
 }
 
+/*
+ * call usign -F -x ...
+ */
 int usign_f_sig(char *fingerprint, const char *sigfile) {
        return usign_f(fingerprint, NULL, NULL, sigfile);
 }
 
-int _usign_key_is_revoked(const char *fingerprint, const char *pubkeydir) {
-       char tml[64] = {0};
-       char rfname[256] = {0};
-
-       snprintf(rfname, sizeof(rfname)-1, "%s/%s", pubkeydir, fingerprint);
-       if (readlink(rfname, tml, sizeof(tml)) > 0 &&
-           !strcmp(tml, ".revoked.")) {
-               return true;
-       };
-
-       return false;
-}
 
+/*
+ * call usign -V ...
+ * return WEXITSTATUS or -1 if fork or execv fails
+ */
 int usign_v(const char *msgfile, const char *pubkeyfile,
            const char *pubkeydir, const char *sigfile, bool quiet) {
        pid_t pid;
@@ -151,13 +207,18 @@ int usign_v(const char *msgfile, const char *pubkeyfile,
        unsigned int usign_argc = 0;
        char fingerprint[17];
 
-       if (usign_f_sig(fingerprint, sigfile))
+       if (usign_f_sig(fingerprint, sigfile)) {
+               if (!quiet)
+                       fprintf(stderr, "cannot get signing key fingerprint\n");
                return 1;
+       }
 
-       if (pubkeydir && _usign_key_is_revoked(fingerprint, pubkeydir))
+       if (pubkeydir && _usign_key_is_revoked(fingerprint, pubkeydir)) {
+               if (!quiet)
+                       fprintf(stderr, "key %s has been revoked!\n", fingerprint);
                return 1;
-
-       usign_argv[usign_argc++] = "/usr/bin/usign";
+       }
+       usign_argv[usign_argc++] = USIGN_EXEC;
        usign_argv[usign_argc++] = "-V";
        usign_argv[usign_argc++] = "-m";
        usign_argv[usign_argc++] = msgfile;
@@ -186,7 +247,13 @@ int usign_v(const char *msgfile, const char *pubkeyfile,
                return -1;
 
        case 0:
-               if (execv(usign_argv[0], usign_argv))
+               if (
+#ifdef UCERT_HOST_BUILD
+                   execvp(usign_argv[0], (char *const *)usign_argv)
+#else
+                   execv(usign_argv[0], (char *const *)usign_argv)
+#endif
+                  )
                        return -1;
 
                break;