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CS 471/571

CS 471/571. Sockets 3. Echo UDP Client in C. //includes not shown int main(int argc, char *argv[]) { int sockfd; struct sockaddr_in server; unsigned int clen; int len; char msg[100]; sockfd = socket(AF_INET, SOCK_DGRAM, 0); memset(&server, 0, sizeof(struct sockaddr_in));

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CS 471/571

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  1. CS 471/571 Sockets 3

  2. Echo UDP Client in C //includes not shown int main(int argc, char *argv[]) { int sockfd; struct sockaddr_in server; unsigned int clen; int len; char msg[100]; sockfd = socket(AF_INET, SOCK_DGRAM, 0); memset(&server, 0, sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_addr.s_addr = inet_addr("127.0.0.1"); server.sin_port = htons(12000); }

  3. Echo UDP Client in C clen = sizeof(server); len = strlen(argv[1]); sendto(sockfd, argv[1], len, 0, (struct sockaddr *) &server, clen); len = recvfrom(sockfd, msg, 100, 0, NULL, NULL); msg[len] = '\0'; printf("%s\n", msg); close(sockfd); }

  4. Echo UDP Server in C //includes not shown int main(int argc, char *argv[]) { int sockfd; struct sockaddr_in server; struct sockaddr_in client; char msg[100]; unsigned int clen; int len; int i; sockfd = socket(AF_INET, SOCK_DGRAM, 0); memset(&server, 0, sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_addr.s_addr = inet_addr("127.0.0.1"); server.sin_port = htons(12000);

  5. Echo UDP Server in C bind(sockfd, (struct sockaddr *) &server, sizeof(struct sockaddr_in)); clen = sizeof(client); len = recvfrom(sockfd, msg, 100, 0, (struct sockaddr *) &client, &clen); for (i = 0; i < len; i++) msg[i] = toupper(msg[i]); sendto(sockfd, msg, len, 0, (struct sockaddr *) &client, clen); close(sockfd); }

  6. C Version of TCP Echo Client #include <stdlib.h> #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <string.h> #include <arpa/inet.h> #include <unistd.h>

  7. C Version of TCP Echo Client int main(int argc, char *argv[]) { int sockfd; struct sockaddr_in server; char msg[100]; sockfd = socket(AF_INET, SOCK_STREAM, 0); memset(&server, 0, sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_addr.s_addr = inet_addr("127.0.0.1"); server.sin_port = htons(12000); connect(sockfd, (struct sockaddr *) &server, sizeof(struct sockaddr_in)); send(sockfd, argv[1], strlen(argv[1]),0); int len = recv(sockfd, msg, 100, 0); msg[len] = '\0'; printf("%s\n", msg); close(sockfd); }

  8. C Version of TCP Echo Server #include <stdlib.h> #include <stdio.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <string.h> #include <arpa/inet.h> #include <unistd.h> #include <ctype.h>

  9. C Version of TCP Echo Server int main(int argc, char *argv[]) { int sockfd1, sockfd2; struct sockaddr_in server; struct sockaddr_in client; char msg[100]; unsigned int clen; int len; int i; sockfd1 = socket(AF_INET, SOCK_STREAM, 0); memset(&server, 0, sizeof(struct sockaddr_in)); server.sin_family = AF_INET; server.sin_addr.s_addr = inet_addr("127.0.0.1"); server.sin_port = htons(12000); bind(sockfd1, (struct sockaddr *) &server, sizeof(struct sockaddr_in));

  10. C Version of TCP Echo Server listen(sockfd1, 5); sockfd2 = accept(sockfd1, (struct sockaddr *) &client, &clen); len = recv(sockfd2, msg, 100, 0); for (i = 0; i < len; i++) msg[i] = toupper(msg[i]); send(sockfd2, msg, len, 0); close(sockfd2); close(sockfd1); }

  11. Java Line Number Client (TCP) import java.io.*; import java.net.*; public class LineNumClient { public static void main(String[] args) throws Exception { Socket mySock = new Socket("localhost", 12000); BufferedReader inSock = new BufferedReader( new InputStreamReader(mySock.getInputStream())); PrintStream outSock = new PrintStream( mySock.getOutputStream()); BufferedReader inFile = new BufferedReader(new FileReader(args[0])); String line = inFile.readLine(); while (line != null) { outSock.println(line); System.out.println(inSock.readLine()); line = inFile.readLine(); } mySock.close(); } }

  12. Java Line Number Server (TCP) with Threads import java.io.*; import java.net.*; public class LineNumServer implements Runnable { Socket client; public LineNumServer(Socket s) { client = s; }

  13. Java Line Number Server (TCP) with Threads public void run() { int num = 0; try { BufferedReader inSock = new BufferedReader( new InputStreamReader(client.getInputStream())); PrintStream outSock = new PrintStream( client.getOutputStream()); String line = inSock.readLine(); while (line != null) { num++; outSock.println( "("+num+","+line.length()+")\t"+line); line = inSock.readLine(); } client.close(); } catch (Exception e) { } }

  14. Java Line Number Server (TCP) with Threads public static void main(String[] args) throws Exception { ServerSocket mySock = new ServerSocket(12000); while (true) { Socket client = mySock.accept(); LineNumServer s = new LineNumServer(client); Thread t = new Thread(s); t.start(); } } }

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