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HTTP Request in C using low level write to socket functionality
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| all: socket.c | |
| gcc socket.c -o soc | |
| clean: | |
| rm -f *~ | |
| rm -f *.o | |
| rm -f soc |
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| /*! | |
| * \file socket.c | |
| * | |
| * Compile with: | |
| * | |
| * gcc socket.c -o soc | |
| * | |
| * Invoke as: | |
| * | |
| * ./soc https://www.google.com 80 | |
| */ | |
| #include <stdio.h> | |
| #include <string.h> | |
| #include <stdlib.h> | |
| #include <unistd.h> | |
| #include <fcntl.h> | |
| #include <netinet/tcp.h> | |
| #include <sys/socket.h> | |
| #include <sys/types.h> | |
| #include <netinet/in.h> | |
| #include <netdb.h> | |
| int | |
| socket_connect (char *host, in_port_t port) | |
| { | |
| struct hostent *hp; | |
| struct sockaddr_in addr; | |
| int on = 1, sock; | |
| if ((hp = gethostbyname (host)) == NULL) | |
| { | |
| herror ("gethostbyname"); | |
| exit (1); | |
| } | |
| bcopy (hp->h_addr, &addr.sin_addr, hp->h_length); | |
| addr.sin_port = htons (port); | |
| addr.sin_family = AF_INET; | |
| sock = socket (PF_INET, SOCK_STREAM, IPPROTO_TCP); | |
| setsockopt (sock, IPPROTO_TCP, TCP_NODELAY, (const char *) &on, sizeof (int)); | |
| if (sock == -1) | |
| { | |
| perror ("setsockopt"); | |
| exit (1); | |
| } | |
| if (connect (sock, (struct sockaddr *) &addr, sizeof (struct sockaddr_in)) == -1) | |
| { | |
| perror ("connect"); | |
| exit (1); | |
| } | |
| return sock; | |
| } | |
| #define BUFFER_SIZE 1024 | |
| int | |
| main (int argc, char *argv[]) | |
| { | |
| int fd; | |
| char buffer[BUFFER_SIZE]; | |
| if(argc < 3) | |
| { | |
| fprintf (stderr, "Usage: %s <hostname> <port>\n", argv[0]); | |
| exit (1); | |
| } | |
| fd = socket_connect (argv[1], atoi (argv[2])); | |
| write (fd, "GET /\r\n", strlen ("GET /\r\n")); /* write(fd, char[]*, len); */ | |
| bzero (buffer, BUFFER_SIZE); | |
| while (read (fd, buffer, BUFFER_SIZE - 1) != 0) | |
| { | |
| fprintf (stderr, "%s", buffer); | |
| bzero (buffer, BUFFER_SIZE); | |
| } | |
| shutdown (fd, SHUT_RDWR); | |
| close (fd); | |
| return 0; | |
| } | |
| /* EOF */ |
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