client/server - Raspberry Pi Forums

i want tcp client/server communication between raspberry pi , laptop ubuntu os running using vmware workstation. raspberry pi act client , ubuntu act server. able compile client , server program.but on client side throws error error, no such host. made changes in ubuntu network settings share other computers. still communication not taking place. able ping between raspberry pi , ubuntu. not able communicate between client , server side. can solve issue , suggest me how network settings in ubuntu pi , ubuntu can communicate.

client.c

code: select all

#include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <netdb.h>   void error(const char *msg) {     perror(msg);     exit(0); }  int main(int argc, char *argv[]) {     int sockfd, portno, n;     struct sockaddr_in serv_addr;     struct hostent *server;      char buffer[256];     if (argc < 3) {         fprintf(stderr,"usage %s hostname port\n", argv[0]);         exit(0);     }     portno = atoi(argv[2]);     sockfd = socket(af_inet, sock_stream, 0);     if (sockfd < 0)          error("error opening socket");     server = gethostbyname(argv[1]);     if (server == null) {         fprintf(stderr,"error, no such host\n");         exit(0);     }     bzero((char *) &serv_addr, sizeof(serv_addr));     serv_addr.sin_family = af_inet;     bcopy((char *)server->h_addr,          (char *)&serv_addr.sin_addr.s_addr,         server->h_length);     serv_addr.sin_port = htons(portno);     if (connect(sockfd,(struct sockaddr *) &serv_addr,sizeof(serv_addr)) < 0)          error("error connecting");     printf("please enter message: ");     bzero(buffer,256);     fgets(buffer,255,stdin);     n = write(sockfd,buffer,strlen(buffer));     if (n < 0)          error("error writing socket");     bzero(buffer,256);     n = read(sockfd,buffer,255);     if (n < 0)          error("error reading socket");     printf("%s\n",buffer);     close(sockfd);     return 0; }   server.c  /* simple server in internet domain using tcp    port number passed argument */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <sys/types.h>  #include <sys/socket.h> #include <netinet/in.h>  void error(const char *msg) {     perror(msg);     exit(1); }  int main(int argc, char *argv[]) {     int sockfd, newsockfd, portno;     socklen_t clilen;     char buffer[256];     struct sockaddr_in serv_addr, cli_addr;     int n;     if (argc < 2) {          fprintf(stderr,"error, no port provided\n");          exit(1);     }     sockfd = socket(af_inet, sock_stream, 0);     if (sockfd < 0)          error("error opening socket");     bzero((char *) &serv_addr, sizeof(serv_addr));         portno = atoi(argv[1]);     serv_addr.sin_family = af_inet;     serv_addr.sin_addr.s_addr = inaddr_any;     serv_addr.sin_port = htons(portno);     if (bind(sockfd, (struct sockaddr *) &serv_addr,         sizeof(serv_addr)) < 0)          error("error on binding");     listen(sockfd,5);     clilen = sizeof(cli_addr);     newsockfd = accept(sockfd,                  (struct sockaddr *) &cli_addr,                  &clilen);     if (newsockfd < 0)          error("error on accept");     bzero(buffer,256);     n = read(newsockfd,buffer,255);     if (n < 0)         error("error reading socket");     printf("here message: %s\n",buffer);     n = write(newsockfd,"i got message",18);     if (n < 0)         error("error writing socket");     close(newsockfd);     close(sockfd);     return 0;  }

do have dns server on local network capable of resolving hostname enter ip address?

or have configured hostname locally in /etc/hosts ?

(the underlying question is: how rpi find out ip address of server?)

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