From 74e5e824defa0a2bb111625e325c93bbf2e3f4bd Mon Sep 17 00:00:00 2001
From: Cody Hiar <cody@hiar.ca>
Date: Sat, 27 Mar 2021 13:59:05 -0600
Subject: add port to file code

---
 port2file/Makefile    |   6 +++
 port2file/README.md   |   3 ++
 port2file/port2file.c | 139 ++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 148 insertions(+)
 create mode 100644 port2file/Makefile
 create mode 100644 port2file/README.md
 create mode 100644 port2file/port2file.c

diff --git a/port2file/Makefile b/port2file/Makefile
new file mode 100644
index 0000000..3c57cf7
--- /dev/null
+++ b/port2file/Makefile
@@ -0,0 +1,6 @@
+
+build:
+	gcc -Wall -Wextra -Wpedantic --std=gnu99 port2file.c -o port2file
+
+lint:
+	splint port2file.c
diff --git a/port2file/README.md b/port2file/README.md
new file mode 100644
index 0000000..7266ab3
--- /dev/null
+++ b/port2file/README.md
@@ -0,0 +1,3 @@
+# port2file
+
+A program that listens on a a port and writes to a file when it receives data
diff --git a/port2file/port2file.c b/port2file/port2file.c
new file mode 100644
index 0000000..9d641d4
--- /dev/null
+++ b/port2file/port2file.c
@@ -0,0 +1,139 @@
+#include <arpa/inet.h>
+#include <fcntl.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <time.h>
+#include <unistd.h>
+#include <errno.h>
+
+#define BUFF_SIZE 1024
+#define ONE_SECOND_IN_NANOSECONDS 1000000000
+#define ONE_SECOND_IN_MICROSECONDS 1000000
+
+static long int calulate_difference(struct timespec a, struct timespec b);
+
+int 
+main() {
+    int server_fd, new_socket;
+    struct sockaddr_in address;
+    int opt = 1;
+    int port = 41401;
+    int addrlen = sizeof(address);
+
+    // Create socket
+    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0)
+    {
+        perror("Could not create socket");
+        exit(EXIT_FAILURE);
+    }
+
+    // Set socket options
+    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR, 
+                &opt, sizeof(opt))) 
+    { 
+        perror("Error during setsockopt"); 
+        exit(EXIT_FAILURE); 
+    } 
+    address.sin_family = AF_INET; 
+    address.sin_addr.s_addr = INADDR_ANY; 
+    address.sin_port = htons( port ); 
+
+    //Bind
+    if(bind(server_fd,(struct sockaddr *)&address , sizeof(address)) < 0)
+    {
+        perror("Bind failure");
+        exit(EXIT_FAILURE); 
+    }
+
+    if (listen(server_fd, 20) < 0) 
+    { 
+        perror("Listen failure"); 
+        exit(EXIT_FAILURE); 
+    } 
+
+
+    while (true) {
+        new_socket = accept(server_fd, (struct sockaddr *)&address, (socklen_t*)&addrlen);
+
+        printf("new connection\n");
+        if (new_socket < 0) {
+            perror("accept"); 
+            exit(EXIT_FAILURE); 
+        }
+
+        // Set the socket to non blocking
+        fcntl(new_socket, F_SETFL, O_NONBLOCK);
+
+        char *buffer;
+        buffer = malloc(sizeof(char) * BUFF_SIZE);
+
+        /* int res = 0; */
+        int count = 0;
+        int idx = 0;
+        int size_recv = 0;
+        long int timeout = ONE_SECOND_IN_NANOSECONDS / 10;
+        struct timespec begin;
+        struct timespec now;
+        long int timediff;
+        char chunk[BUFF_SIZE];
+
+        clock_gettime(CLOCK_MONOTONIC, &begin);
+
+        while (true) {
+            clock_gettime(CLOCK_MONOTONIC, &now);
+
+            timediff = calulate_difference(now, begin);
+
+            //if you got some data, then break after timeout
+            if( count > 0 && timediff > timeout )
+            {
+                break;
+            }
+
+            memset(chunk, 0, BUFF_SIZE);	//clear the variable
+            size_recv = recv(new_socket, chunk, BUFF_SIZE, 0);
+            /* printf("chunk: %s\n", chunk); */
+
+
+            if (size_recv > 0)
+            {
+                buffer = realloc(buffer, (idx + BUFF_SIZE) * sizeof(char));
+                memcpy((char *)buffer + idx, chunk, BUFF_SIZE);
+                clock_gettime(CLOCK_MONOTONIC, &begin);
+                /* printf("buff: %s\n", buffer); */
+                count++;
+                idx = count * BUFF_SIZE;
+            }
+            else if (errno != EWOULDBLOCK)
+            {
+                (void) usleep(ONE_SECOND_IN_MICROSECONDS / 100);
+            } else { 
+                (void) usleep(ONE_SECOND_IN_MICROSECONDS / 100);
+            }
+
+        }
+
+        FILE *f = fopen("output.log", "w");
+        if (f == NULL)
+        {
+            printf("Error opening file!\n");
+            exit(1);
+        }
+
+        fprintf(f, "%s", buffer);
+
+        (void) fclose(f);
+        (void) close(new_socket);
+        (void) free(buffer);
+    }
+}
+
+static long int 
+calulate_difference(struct timespec a, struct timespec b) {
+    int seconds_to_nanoseconds = (a.tv_sec - b.tv_sec) * 1000000000;
+    return seconds_to_nanoseconds + a.tv_nsec - b.tv_nsec;
+}
+
-- 
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