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#include <stdio.h>#include <sys/types.h>#include <sys/socket.h>#include <netinet/in.h>#include <netdb.h>void error(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[2560];    char header_buff[1000];    char *wbuffer;    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,&serv_addr,sizeof(serv_addr)) < 0)        error("ERROR connecting");    bzero(buffer,2560);    strcpy(buffer,"GET /debian/pool/main/j/jabber/jabber-dev_1.4.3-3.3_i386.deb HTTP/1.0\r\n\r\n");    n = write(sockfd,buffer,strlen(buffer));        FILE *file;        file = fopen("/tmp/hello.deb", "wb");    if (n < 0)         error("ERROR writing to socket");    bzero(buffer,2560);    bzero(header_buff,1000);        int nb,o;    o=0;while ( !(strstr(header_buff, "\r\n\r\n")) ) {        nb=read(sockfd,buffer,18);      /*can read with any buffer chunks size<buffer size*/        printf("%d bytes header_c recieved \n",nb);        strncpy(header_buff+o,buffer,nb);        /*copy data from general socket buffer to header+data buffer*/        o=strlen(header_buff);        printf("%d bytes of header and data \n",o);        bzero(buffer,2560);    }/*calculate header size*/int header_bytes;header_bytes=strlen(header_buff)-strlen((strstr(header_buff, "\r\n\r\n")));strncpy(buffer,header_buff,header_bytes);printf("begin header\n%s\nend header\n",buffer);/*write remind afrer header an \r\n\r\n as data */fwrite((strstr(header_buff, "\r\n\r\n") + 4),1,strlen((strstr(header_buff, "\r\n\r\n") + 4)),file);bzero(buffer,2560);    while ( (nb=read(sockfd,buffer,2560)) ) {        printf("%d bytes of data recieved \n",nb);        //printf("%s",buffer);        fwrite(buffer,1,nb,file);        bzero(buffer,2560);    }        fclose(file);        return 0;}