Implement src/testclient-promisc.c

Implement src/testclient-promisc.c to demonstrate raw packet access
("promiscuous mode") to interfaces

src/Makefile

@@ -14,7 +14,8 @@ HEADERS		= kiss.h ax25.h ax25/if.h ax25/macros.h ax25/proto.h \
 OBJS		= kiss.o ax25.o if.o call.o frame.o sock.o route.o server.o \
 		  list.o hash.o dict.o print.o
 
-EXAMPLES	= testserver testclient-connect testclient-listen decode
+EXAMPLES	= testserver testclient-connect testclient-listen testclient-promisc \
+		  decode
 
 HEADERS_BUILD	= $(addprefix $(INCLUDE_PATH)/$(HEADER_SUBDIR)/, $(HEADERS))
 

src/testclient-promisc.c

@@ -0,0 +1,114 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <fcntl.h>
+#include <errno.h>
+
+#include <patty/ax25.h>
+#include <patty/print.h>
+
+static void usage(int argc, char **argv, const char *message, ...) {
+    if (message != NULL) {
+        va_list args;
+
+        va_start(args, message);
+        vfprintf(stderr, message, args);
+         fprintf(stderr, "\n");
+        va_end(args);
+    }
+
+    fprintf(stderr, "usage: %s /var/run/patty/patty.sock\n", argv[0]);
+
+    exit(1);
+}
+
+int main(int argc, char **argv) {
+    struct sockaddr_un addr;
+
+    int fd,
+        sock,
+        pty;
+
+    patty_ax25_addr peer;
+    char path[PATTY_AX25_SOCK_PATH_SIZE];
+
+    uint8_t buf[4096];
+    ssize_t readlen;
+
+    if (argc != 2) {
+        usage(argc, argv, "No patty socket provided");
+    }
+
+    patty_ax25_pton("KZ3ROX", 0, &peer);
+
+    if ((fd = socket(PF_UNIX, SOCK_STREAM, 0)) < 0) {
+        fprintf(stderr, "%s: %s: %s: %s\n",
+            argv[0], "socket()", argv[1], strerror(errno));
+
+        goto error_socket;
+    }
+
+    memset(&addr, '\0', sizeof(addr));
+    addr.sun_family = AF_UNIX;
+    strncpy(addr.sun_path, argv[1], sizeof(addr.sun_path));
+
+    if (connect(fd, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
+        goto error_connect;
+    }
+
+    if ((sock = patty_ax25_call_openif(fd, "kiss0", path, sizeof(path))) < 0) {
+        fprintf(stderr, "%s: %s: %s\n",
+            argv[0], "patty_ax25_call_openif()", strerror(errno));
+
+        goto error_call_socket;
+    }
+
+    if ((pty = open(path, O_RDWR)) < 0) {
+        fprintf(stderr, "%s: %s: %s: %s\n",
+            argv[0], path, "open()", strerror(errno));
+
+        goto error_open_pty;
+    }
+
+    while ((readlen = read(pty, buf, sizeof(buf))) > 0) {
+        patty_ax25_frame frame;
+
+        if (patty_ax25_frame_decode(&frame, PATTY_AX25_FRAME_NORMAL, buf, readlen) < 0) {
+            perror("Unable to decode frame");
+
+            goto error_ax25_frame_decode;
+        }
+
+        if (patty_print_frame(stdout, &frame, buf, readlen) < 0) {
+            perror("Unable to print frame");
+
+            goto error_print_frame;
+        }
+    }
+
+    close(pty);
+
+    patty_ax25_call_close(fd, sock);
+
+    close(fd);
+
+    return 0;
+
+error_print_frame:
+error_ax25_frame_decode:
+error_open_pty:
+    patty_ax25_call_close(fd, sock);
+
+error_call_socket:
+    close(fd);
+
+error_connect:
+error_socket:
+    return 1;
+}