picc_to_pcsc now runs as a daemon if the parameters verbose or debug are not defined

git-svn-id: https://vsmartcard.svn.sourceforge.net/svnroot/vsmartcard@333 96b47cad-a561-4643-ad3b-153ac7d7599c

picc_to_pcsc/src/picc_to_pcsc.c

@@ -37,13 +37,49 @@ static FILE *picc_fd = NULL; /*filehandle used for PICCDEV*/
 static LPSTR readers = NULL;
 static SCARDCONTEXT hContext = 0;
 static SCARDHANDLE hCard = 0;
+static int verbose = 0, debug = 0;
 
 /* Forward declaration */
+static void daemonize();
 static void cleanup_exit(int signo);
 static void cleanup(void);
 static size_t picc_decode_apdu(char *inbuf, size_t inlen, unsigned char **outbuf);
 static size_t picc_encode_rapdu(unsigned char *inbuf, size_t inlen, char **outbuf);
 
+void daemonize() {
+    pid_t pid, sid;
+
+    /*Fork and continue as child process*/
+    pid = fork();
+    if (pid < 0)
+        goto err;
+    if (pid > 0) /* Exit the parent */
+        exit(0);
+
+    umask(0);
+
+    /* Create new session and set the process group ID */
+    sid = setsid();
+    if (sid < 0)
+        goto err;
+         
+    /* Change the current working directory.  This prevents the current
+       directory from being locked; hence not being able to remove it. */
+    if (chdir("/") < 0)
+        goto err;
+
+    /* Redirect standard files to /dev/null */
+    close(STDIN_FILENO);
+    close(STDOUT_FILENO);
+    close(STDERR_FILENO);
+
+    return;
+
+err:
+    fprintf(stderr, "Failed to start the daemon. Exiting.\n");
+    exit(1);
+}
+
 void cleanup_exit(int signo){
     cleanup();
     exit(0);
@@ -76,7 +112,8 @@ size_t picc_decode_apdu(char *inbuf, size_t inlen, unsigned char **outbuf)
 
     p = realloc(*outbuf, length);
     if (!p) {
-        fprintf(stderr, "Error allocating memory for decoded C-APDU\n");
+        if (debug || verbose)
+            fprintf(stderr, "Error allocating memory for decoded C-APDU\n");
         goto noapdu;
     }
     *outbuf = p;
@@ -85,7 +122,8 @@ size_t picc_decode_apdu(char *inbuf, size_t inlen, unsigned char **outbuf)
     while(inbuf+inlen > end && length > pos) {
         b = strtoul(end, &end, 16);
         if (b > 0xff) {
-            fprintf(stderr, "%s:%u Error decoding C-APDU\n", __FILE__, __LINE__);
+            if (debug || verbose)
+                fprintf(stderr, "%s:%u Error decoding C-APDU\n", __FILE__, __LINE__);
             goto noapdu;
         }
 
@@ -110,7 +148,8 @@ size_t picc_encode_rapdu(unsigned char *inbuf, size_t inlen, char **outbuf)
     length = 5+inlen*3+1;
     p = realloc(*outbuf, length);
     if (!p) {
-        fprintf(stderr, "Error allocating memory for encoded R-APDU\n");
+        if (debug || verbose)
+            fprintf(stderr, "Error allocating memory for encoded R-APDU\n");
         goto err;
     }
     *outbuf = p;
@@ -149,7 +188,6 @@ int main (int argc, char **argv)
     ssize_t linelen;
 
     unsigned int readernum = 0;
-    int verbose = 0;
 
     struct sigaction new_sig, old_sig;
 
@@ -157,31 +195,42 @@ int main (int argc, char **argv)
     if (argc > 1) {
         readernum = strtoul(argv[1], NULL, 10);
         if (argc > 2) {
-            if (0 != strcmp(argv[2], "verbose") || argc > 3) {
+            if (0 == strcmp(argv[2], "verbose")) 
+                verbose++;
+            else if (0 == strcmp(argv[2], "debug"))
+                debug++;
+            else
+                goto parse_err;
+            if (argc > 3) {
+parse_err:                
                 fprintf(stderr, "Usage:  "
-                        "%s [reader number] [verbose]\n", argv[0]);
+                        "%s [reader number] [verbose | debug]\n", argv[0]);
                 exit(2);
             }
-            verbose++;
         }
     }
 
+    if (!verbose && !debug)
+        daemonize();
 
     /* Register signal handlers */
     new_sig.sa_handler = cleanup_exit;
     sigemptyset(&new_sig.sa_mask);
     new_sig.sa_flags = SA_RESTART;
-    if (sigaction(SIGINT, &new_sig, &old_sig) < 0)
+    if ((sigaction(SIGINT, &new_sig, &old_sig) < 0)
+            || (sigaction(SIGTERM, &new_sig, &old_sig) < 0))
         goto err;
 
 
     /* Open the device */
     picc_fd = fopen(PICCDEV, "a+"); /*O_NOCTTY ?*/
     if (!picc_fd) {
-        fprintf(stderr,"Error opening %s\n", PICCDEV);
+        if (debug || verbose)
+            fprintf(stderr,"Error opening %s\n", PICCDEV);
         goto err;
     }
-    printf("Connected to %s\n", PICCDEV);
+    if (debug || verbose)
+        printf("Connected to %s\n", PICCDEV);
 
 
     /* connect to reader and card */
@@ -196,7 +245,8 @@ int main (int argc, char **argv)
         linelen = getline(&read, &readlen, picc_fd);
         if (linelen < 0) {
             if (linelen < 0) {
-                fprintf(stderr,"Error reading from %s\n", PICCDEV);
+                if (debug || verbose)
+                    fprintf(stderr,"Error reading from %s\n", PICCDEV);
                 goto err;
             }
         }
@@ -204,7 +254,7 @@ int main (int argc, char **argv)
             continue;
         fflush(picc_fd);
 
-        if (verbose)
+        if (debug)
             printf("%s\n", read);
 
 
@@ -232,10 +282,10 @@ int main (int argc, char **argv)
 
 
         /* write R-APDU */
-        if (verbose)
+        if (debug)
-            printf("INF: Writing R-APDU\n\n%s\n\n", buf);
+            printf("INF: Writing R-APDU\n\n%s\n\n", (char *) buf);
 
-        fprintf(picc_fd,"%s\r\n", buf);
+        fprintf(picc_fd,"%s\r\n", (char *) buf);
         fflush(picc_fd);
     }