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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <netdb.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <ctype.h>
#include <sys/wait.h>
#include <signal.h>
#include <time.h>
#include <dirent.h>
#define LENGTH 512
#define MAXDATASIZE 1000
typedef enum {FALSE, TRUE} bool;
/* inout() - This function prints out the results of the file descriptor
* after finishing sending the request to the server
*/
int inout(int in, int out)
{
char *s;
int i = 0;
s = (char *) malloc (1000*sizeof(char));
while(read(in, s+i, 1) != 0) {
if (s[i] == '\n') {
write(out, s, i+1);
return i+1;
}
i++;
}
return 0;
}
void *get_in_addr(struct sockaddr *sa)
{
if (sa->sa_family == AF_INET) {
return &(((struct sockaddr_in*)sa)->sin_addr);
}
return &(((struct sockaddr_in6*)sa)->sin6_addr);
}
/* isvalidip() - Uses the inet_pton() function to check whether or not
* the specified IP address is valid. Returns TRUE if valid and FALSE
* otherwise.
*/
bool isvalidip(char *ip)
{
struct sockaddr_in sa;
int valid = inet_pton(AF_INET, ip, &(sa.sin_addr));
return valid != 0;
}
/* send_request() - Contains the principal code the for the program.
* The function creates a HTTP GET string to send to the server
* and returns everything on a file descriptor to pass it to main().
*/
int send_request(char *dns, char *port,char *reqtype)
{
int sockfd, bindfd; // socket and bind file descriptors
char *ptr, *host, path[100];
char getrequest[1024];
struct addrinfo hints, *res;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
// conditions to differentiate between an IP address and a hostname
if ( isvalidip(dns) ) { // when an IP is found then no paths are specified
sprintf(getrequest, "%s / HTTP/1.0\nHOST: %s\n\n",reqtype, dns); // create a get request only for the IP
} else { // if it's not an IP, then it should be a DNS name
if ( (ptr = strstr(dns, "/")) == NULL) { // if the DNS name does not contain a slash at the end
sprintf(getrequest, "%s / HTTP/1.0\nHOST: %s\n\n",reqtype, dns);// we send a request only for the dns name
}
else { // it there is a slash right after the DNS name then there is path to a filename
strcpy(path, ptr);
host = strtok(dns, "/"); //truncate the argument to a PATH and DNS name
sprintf(getrequest, "%s %s HTTP/1.0\nHOST: %s\n\n",reqtype, path, dns);
}
}
// gets linked list of results of a specified hostname
if ( getaddrinfo(dns, port, &hints, &res) != 0 ){
fprintf(stderr, "Host or IP not valid\n"); //quits program if the hostname was not found
exit(0);
}
// creates a socket from hostname results and passes everything to a file descriptor
sockfd = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
// bind the socket to the port passed to getaddrinfo()
bindfd = bind(sockfd, res->ai_addr, res->ai_addrlen);
// establish a connection and quits if there is a connection error
if ( connect(sockfd, res->ai_addr, res->ai_addrlen) != 0 ){
fprintf(stderr, "Connection error\n");
exit(0);
}
int optval = 1; //is
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &optval, sizeof optval);
// writes the HTTP request to the socked file descriptor
write(sockfd, getrequest, strlen(getrequest));
return sockfd; //returns the results to main
}
int main(int argc, char **argv)
{
int port, sockfd;
char *host, *ptr;
port = atoi(argv[2]);
sprintf(host,"%s/%s",argv[1],argv[4]);
if(argv[3][0]=='G'&&argv[3][1]=='E'&&argv[3][2]=='T') //For GET requests
{
sockfd = send_request(host, argv[2],argv[3]);
while(inout(sockfd, 1) > 0);
} else if(argv[3][0]=='P'&&argv[3][1]=='U'&&argv[3][2]=='T') //For PUT requests
{
char* fs_name = argv[4];
char sdbuf[LENGTH];
printf("\nclient>> Sending %s to the Server... ", fs_name);
FILE *fs = fopen(fs_name, "r");
if(fs == NULL)
{
printf("\nclient>> ERROR: File %s not found.", fs_name);
exit(1);
}
sockfd = send_request(host, argv[2],argv[3]);
bzero(sdbuf, LENGTH);
int fs_block_sz;
while((fs_block_sz = fread(sdbuf, sizeof(char), LENGTH, fs)) > 0)
{
if(send(sockfd, sdbuf, fs_block_sz, 0) < 0)
{
fprintf(stderr, "ERROR: Failed to send file %s. (errno = %d)", fs_name, errno);
exit(1);
}
bzero(sdbuf, LENGTH);
}
shutdown(sockfd, SHUT_WR);
printf("\nclient>> Ok File %s from Client was Sent!\n", fs_name);
} else { //For INVALID requests
printf("\nclient>> Invalid request.\n");
exit(1);
}
close(sockfd);
return 0;
}
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