let the ykpiv_connect() function select as well

lib/error.c

@@ -45,6 +45,7 @@ static const err_t errors[] = {
   ERR (YKPIV_MEMORY_ERROR, "Error allocating memory"),
   ERR (YKPIV_PCSC_ERROR, "Error in PCSC call"),
   ERR (YKPIV_SIZE_ERROR, "Wrong buffer size"),
+  ERR (YKPIV_APPLET_ERROR, "No PIV applet found"),
 };
 
 /**

lib/ykpiv.c

@@ -145,6 +145,28 @@ ykpiv_rc ykpiv_connect(ykpiv_state *state, const char *wanted) {
     return YKPIV_PCSC_ERROR;
   }
 
+  {
+    APDU apdu;
+    unsigned char data[0xff];
+    unsigned long recv_len = sizeof(data);
+    int sw;
+    ykpiv_rc res;
+
+    memset(apdu.raw, 0, sizeof(apdu));
+    apdu.st.ins = 0xa4;
+    apdu.st.p1 = 0x04;
+    apdu.st.lc = sizeof(aid);
+    memcpy(apdu.st.data, aid, sizeof(aid));
+
+    if((res = ykpiv_send_data(state, apdu.raw, data, &recv_len, &sw) != YKPIV_OK)) {
+      return res;
+    } else if(sw == 0x9000) {
+      return YKPIV_OK;
+    }
+
+    return YKPIV_APPLET_ERROR;
+  }
+
   return YKPIV_OK;
 }
 

lib/ykpiv.h

@@ -44,6 +44,7 @@ extern "C"
 		YKPIV_MEMORY_ERROR = -1,
 		YKPIV_PCSC_ERROR = -2,
 		YKPIV_SIZE_ERROR = -3,
+		YKPIV_APPLET_ERROR = -4,
 	} ykpiv_rc;
 
 	const char *ykpiv_strerror(ykpiv_rc err);

tool/yubico-piv-tool.c

@@ -41,11 +41,6 @@
 
 #include "cmdline.h"
 
-unsigned const char aid[] = {
-  0xa0, 0x00, 0x00, 0x03, 0x08
-};
-
-
 /* FASC-N containing S9999F9999F999999F0F1F0000000000300001E encoded in
  * 4-bit BCD with 1 bit parity. run through the tools/fasc.pl script to get
  * bytes. */
@@ -95,27 +90,6 @@ static bool sign_data(ykpiv_state*, unsigned char*, int, unsigned char, unsigned
     ASN1_BIT_STRING*);
 static int get_object_id(enum enum_slot slot);
 
-static bool select_applet(ykpiv_state *state) {
-  APDU apdu;
-  unsigned char data[0xff];
-  unsigned long recv_len = sizeof(data);
-  int sw;
-
-  memset(apdu.raw, 0, sizeof(apdu));
-  apdu.st.ins = 0xa4;
-  apdu.st.p1 = 0x04;
-  apdu.st.lc = sizeof(aid);
-  memcpy(apdu.st.data, aid, sizeof(aid));
-
-  if(ykpiv_send_data(state, apdu.raw, data, &recv_len, &sw) != YKPIV_OK) {
-    return false;
-  } else if(sw == 0x9000) {
-    return true;
-  }
-
-  return false;
-}
-
 static bool authenticate(ykpiv_state *state, unsigned const char *key) {
   APDU apdu;
   unsigned char data[0xff];
@@ -1314,11 +1288,6 @@ int main(int argc, char *argv[]) {
     return EXIT_FAILURE;
   }
 
-  if(select_applet(state) == false) {
-    fprintf(stderr, "Failed to select applet.\n");
-    return EXIT_FAILURE;
-  }
-
   if(authenticate(state, key) == false) {
     fprintf(stderr, "Failed authentication with the applet.\n");
     return EXIT_FAILURE;