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cherrysafe.c
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cherrysafe.c
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#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <sys/wait.h>
#include <signal.h>
#define PORT "24377" // cherr
#define BACKLOG 10
#define MSGLEN 255 // length of incoming message
#define HASH ""
// thanks djb: http://www.cse.yorku.ca/~oz/hash.html
unsigned long hash(unsigned char *str)
{
unsigned long hash = 5381;
int c;
while (c = *str++)
hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
return hash;
}
// code taken from http://beej.us/guide/bgnet/output/html/multipage/clientserver.html
void sigchld_handler(int s)
{
while(waitpid(-1, NULL, WNOHANG) > 0);
}
// get sockaddr, ipv4 or ipv6
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);
}
int main (int argc, char **argv)
{
// open simple socket
int sockfd, new_fd;
struct addrinfo hints, *servinfo, *p;
struct sockaddr_storage their_addr;
socklen_t sin_size;
struct sigaction sa;
int yes = 1;
char s[INET6_ADDRSTRLEN];
int rv;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_PASSIVE;
if ((rv = getaddrinfo(NULL, PORT, &hints, &servinfo)) != 0 )
{
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(rv));
return -1;
}
for (p = servinfo; p != NULL; p = p->ai_next)
{
if ( (sockfd = socket(p->ai_family, p->ai_socktype,
p->ai_protocol) ) == -1)
{
perror("server: socket");
continue;
}
if ( setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &yes,
sizeof(int)) == -1 )
{
perror("setsockopt");
exit(-1);
}
if ( bind(sockfd, p->ai_addr, p->ai_addrlen) == -1 )
{
close(sockfd);
perror("server: bind");
continue;
}
break;
}
if ( p == NULL )
{
fprintf(stderr, "server: failed to bind\n");
return -2;
}
freeaddrinfo(servinfo);
// listen with select
if ( listen(sockfd, BACKLOG) == -1 )
{
perror("listen");
exit(-1);
}
sa.sa_handler = sigchld_handler; // reap zombies
sigemptyset(&sa.sa_mask);
sa.sa_flags = SA_RESTART;
if ( sigaction(SIGCHLD, &sa, NULL) == -1 )
{
perror("sigaction");
exit(-1);
}
printf("server: waiting for connections...\n");
while(1)
{
sin_size = sizeof their_addr;
new_fd = accept(sockfd, (struct sockaddr*) &their_addr,
&sin_size);
if ( new_fd == -1 )
{
perror("accept");
continue;
}
inet_ntop(their_addr.ss_family,
get_in_addr((struct sockaddr*) &their_addr),
s, sizeof s);
printf("server: got connection from %s\n", s);
if (!fork()) // child
{
close(sockfd); // no need to listen
// read string
unsigned char* datain;
datain = malloc(sizeof(char) * MSGLEN);
memset(datain, 0, sizeof(char) * MSGLEN);
ssize_t read_data = read(new_fd, datain, MSGLEN);
if ( read_data < 0 )
{
perror("read");
exit(-1);
}
printf("read %zd chars: %s ", read_data, datain);
memset(datain+read_data-1, 0, sizeof(char) * MSGLEN - read_data + 1);
// hash it
unsigned long result = hash(datain);
printf("%zd\n", result);
// exec qmail-inject + local IRC?
close(new_fd);
exit(0);
}
close(new_fd); // parent doesn't need this
}
return 0;
}