From 2a02a3a7dfda2679ebda86fa830023fe996a06c9 Mon Sep 17 00:00:00 2001
From: Harsh Sharma <92harshsharma@gmail.com>
Date: Wed, 13 Jun 2018 13:26:38 -0500
Subject: Initial commit

---
 util_sink/src/util_sink.c | 125 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 125 insertions(+)
 create mode 100644 util_sink/src/util_sink.c

(limited to 'util_sink/src/util_sink.c')

diff --git a/util_sink/src/util_sink.c b/util_sink/src/util_sink.c
new file mode 100644
index 0000000..3c09c9b
--- /dev/null
+++ b/util_sink/src/util_sink.c
@@ -0,0 +1,125 @@
+/*
+ / _____)             _              | |
+( (____  _____ ____ _| |_ _____  ____| |__
+ \____ \| ___ |    (_   _) ___ |/ ___)  _ \
+ _____) ) ____| | | || |_| ____( (___| | | |
+(______/|_____)_|_|_| \__)_____)\____)_| |_|
+  (C)2013 Semtech-Cycleo
+
+Description:
+    Network sink, receives UDP packets on certain ports and discards them
+
+License: Revised BSD License, see LICENSE.TXT file include in the project
+Maintainer: Sylvain Miermont
+*/
+
+
+/* -------------------------------------------------------------------------- */
+/* --- DEPENDANCIES --------------------------------------------------------- */
+
+/* fix an issue between POSIX and C99 */
+#if __STDC_VERSION__ >= 199901L
+    #define _XOPEN_SOURCE 600
+#else
+    #define _XOPEN_SOURCE 500
+#endif
+
+#include <stdint.h>     /* C99 types */
+#include <stdio.h>      /* printf, fprintf, sprintf, fopen, fputs */
+
+#include <string.h>     /* memset */
+#include <time.h>       /* time, clock_gettime, strftime, gmtime, clock_nanosleep*/
+#include <stdlib.h>     /* atoi, exit */
+#include <errno.h>      /* error messages */
+
+#include <sys/socket.h> /* socket specific definitions */
+#include <netinet/in.h> /* INET constants and stuff */
+#include <arpa/inet.h>  /* IP address conversion stuff */
+#include <netdb.h>      /* gai_strerror */
+
+/* -------------------------------------------------------------------------- */
+/* --- PRIVATE MACROS ------------------------------------------------------- */
+
+#define ARRAY_SIZE(a)   (sizeof(a) / sizeof((a)[0]))
+#define STRINGIFY(x)    #x
+#define STR(x)          STRINGIFY(x)
+#define MSG(args...)    fprintf(stderr, args) /* message that is destined to the user */
+
+/* -------------------------------------------------------------------------- */
+/* --- MAIN FUNCTION -------------------------------------------------------- */
+
+int main(int argc, char **argv)
+{
+    int i; /* loop variable and temporary variable for return value */
+
+    /* server socket creation */
+    int sock; /* socket file descriptor */
+    struct addrinfo hints;
+    struct addrinfo *result; /* store result of getaddrinfo */
+    struct addrinfo *q; /* pointer to move into *result data */
+    char host_name[64];
+    char port_name[64];
+
+    /* variables for receiving packets */
+    struct sockaddr_storage dist_addr;
+    socklen_t addr_len = sizeof dist_addr;
+    uint8_t databuf[4096];
+    int byte_nb;
+
+    /* check if port number was passed as parameter */
+    if (argc != 2) {
+        MSG("Usage: util_sink <port number>\n");
+        exit(EXIT_FAILURE);
+    }
+
+    /* prepare hints to open network sockets */
+    memset(&hints, 0, sizeof hints);
+    hints.ai_family = AF_UNSPEC; /* should handle IP v4 or v6 automatically */
+    hints.ai_socktype = SOCK_DGRAM;
+    hints.ai_flags = AI_PASSIVE; /* will assign local IP automatically */
+
+    /* look for address */
+    i = getaddrinfo(NULL, argv[1], &hints, &result);
+    if (i != 0) {
+        MSG("ERROR: getaddrinfo returned %s\n", gai_strerror(i));
+        exit(EXIT_FAILURE);
+    }
+
+    /* try to open socket and bind it */
+    for (q=result; q!=NULL; q=q->ai_next) {
+        sock = socket(q->ai_family, q->ai_socktype,q->ai_protocol);
+        if (sock == -1) {
+            continue; /* socket failed, try next field */
+        } else {
+            i = bind(sock, q->ai_addr, q->ai_addrlen);
+            if (i == -1) {
+                shutdown(sock, SHUT_RDWR);
+                continue; /* bind failed, try next field */
+            } else {
+                break; /* success, get out of loop */
+            }
+        }
+    }
+    if (q == NULL) {
+        MSG("ERROR: failed to open socket or to bind to it\n");
+        i = 1;
+        for (q=result; q!=NULL; q=q->ai_next) {
+            getnameinfo(q->ai_addr, q->ai_addrlen, host_name, sizeof host_name, port_name, sizeof port_name, NI_NUMERICHOST);
+            MSG("result %i host:%s service:%s\n", i, host_name, port_name);
+            ++i;
+        }
+        exit(EXIT_FAILURE);
+    }
+    MSG("INFO: util_sink listening on port %s\n", argv[1]);
+    freeaddrinfo(result);
+
+    while (1) {
+        byte_nb = recvfrom(sock, databuf, sizeof databuf, 0, (struct sockaddr *)&dist_addr, &addr_len);
+        if (byte_nb == -1) {
+            MSG("ERROR: recvfrom returned %s \n", strerror(errno));
+            exit(EXIT_FAILURE);
+        }
+        getnameinfo((struct sockaddr *)&dist_addr, addr_len, host_name, sizeof host_name, port_name, sizeof port_name, NI_NUMERICHOST);
+        printf("Got packet from host %s port %s, %i bytes long\n", host_name, port_name, byte_nb);
+    }
+}
-- 
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