add concurrent, iterative and UDP servers

2 files changed, 79 insertions, 0 deletions

diff --git a/q6/c/client.c b/q6/c/client.c
new file mode 100644
index 0000000..12e00fa
--- /dev/null
+++ b/q6/c/client.c
@@ -0,0 +1,41 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+#include <string.h>
+
+int main(int argc, char *argv[]) {
+    int sockfd;
+    struct sockaddr_in servaddr;
+    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+
+    servaddr.sin_family = AF_INET; 
+    servaddr.sin_addr.s_addr = htonl(INADDR_ANY); 
+
+    int port = atoi(argv[1]);
+    servaddr.sin_port = htons(port);
+
+    int n; 
+
+    socklen_t len = sizeof(servaddr);
+    char *buf = malloc(100);
+    fgets(buf, 100, stdin);
+    while(strcmp(buf, "quit\n") != 0) {
+        sendto(sockfd, buf, strlen(buf), 
+                MSG_CONFIRM, (const struct sockaddr *) &servaddr,  
+                sizeof(servaddr)); 
+
+        n = recvfrom(sockfd, buf, 100,  
+                MSG_WAITALL, (struct sockaddr *) &servaddr, 
+                &len); 
+        printf("Recieved: %s", buf);
+        fgets(buf, 100, stdin);
+    }
+
+    close(sockfd); 
+    return 0;
+}
diff --git a/q6/c/server.c b/q6/c/server.c
new file mode 100644
index 0000000..4b25070
--- /dev/null
+++ b/q6/c/server.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+int main(int argc, char *argv[]) {
+    int sockfd;
+    struct sockaddr_in servaddr, cli; 
+    sockfd = socket(AF_INET, SOCK_DGRAM, 0);
+
+    servaddr.sin_family = AF_INET; 
+    servaddr.sin_addr.s_addr = htonl(INADDR_ANY); 
+
+    int port = atoi(argv[1]);
+    servaddr.sin_port = htons(port);
+
+    bind(sockfd, (struct sockaddr *)&servaddr, sizeof(servaddr));
+
+    socklen_t len = sizeof(cli);
+    while(1) {
+        int n;
+        char *buf = malloc(100);
+        while(
+                (n = recvfrom(sockfd, (char *)buf, 100, MSG_WAITALL, (struct sockaddr*) &cli, &len))
+                > 0
+             ) {
+            printf("Client message: %s\n", buf);
+            fflush(stdout);
+            sendto(sockfd, buf, n, MSG_CONFIRM, (const struct sockaddr *) &cli, len);
+        }
+    }
+    close(sockfd);
+    return 0;
+}