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/******************************************************************************
Curse of War -- Real Time Strategy Game for Linux.
Copyright (C) 2013 Alexey Nikolaev.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
******************************************************************************/
#include "network.h"
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);
}
/* returns port number */
in_port_t get_in_port(struct sockaddr *sa) {
if (sa->sa_family == AF_INET) {
return (((struct sockaddr_in*)sa)->sin_port);
}
return (((struct sockaddr_in6*)sa)->sin6_port);
}
#define SIZE6 16
/* Equality of two arrays of size SIZE6 (two IPv6 addresses) */
int eq_6_addr (uint8_t s1[SIZE6], uint8_t s2[SIZE6]) {
int i;
for(i=0; i<SIZE6; ++i) {
if (s1[i] != s2[i]) return 0;
}
return 1;
}
/* Equality of two addresses (both IP number and port number) */
int sa_match (struct sockaddr_storage *sa1, struct sockaddr_storage *sa2) {
struct sockaddr *s1 = (struct sockaddr*) sa1;
struct sockaddr *s2 = (struct sockaddr*) sa2;
return (
/* IPv4 equality */
( s1->sa_family == AF_INET && s2->sa_family == AF_INET &&
((struct sockaddr_in*)s1)->sin_addr.s_addr == ((struct sockaddr_in*)s2)->sin_addr.s_addr )
||
/* IPv6 equality */
( s1->sa_family == AF_INET6 && s2->sa_family == AF_INET6 &&
eq_6_addr (
((struct sockaddr_in6*)s1)->sin6_addr.s6_addr,
((struct sockaddr_in6*)s2)->sin6_addr.s6_addr ) )
)
&&
( get_in_port(s1) == get_in_port(s2) );
}
/* Initialize server socket */
int server_init (int *p_sfd, char*str_port) {
struct addrinfo hints;
struct addrinfo *result, *rp;
int s;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
hints.ai_flags = AI_PASSIVE; /* For wildcard IP address */
hints.ai_protocol = 0; /* Any protocol */
hints.ai_canonname = NULL;
hints.ai_addr = NULL;
hints.ai_next = NULL;
s = getaddrinfo(NULL, str_port, &hints, &result);
if (s != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
return -1;
}
/* getaddrinfo() returns a list of address structures.
* Try each address until we successfully bind(2).
* If socket(2) (or bind(2)) fails, we (close the socket
* and) try the next address. */
for (rp = result; rp != NULL; rp = rp->ai_next) {
*p_sfd = socket(rp->ai_family, rp->ai_socktype,
rp->ai_protocol);
if (*p_sfd == -1)
continue;
if (bind(*p_sfd, rp->ai_addr, rp->ai_addrlen) == 0)
break; /* Success */
close(*p_sfd);
}
if (rp == NULL) { /* No address succeeded */
fprintf(stderr, "Could not bind\n");
return -1;
}
freeaddrinfo(result); /* No longer needed */
return 0;
}
/* initialize client socket, and fill struct addrinfo *srv (split into two functions!) */
int client_init_session (int *p_sfd, char* str_my_port, struct addrinfo *srv, char *str_server_addr, char *str_server_port) {
struct addrinfo hints;
struct addrinfo *result, *rp;
int s;
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
hints.ai_flags = AI_PASSIVE; /* For wildcard IP address */
hints.ai_protocol = 0; /* Any protocol */
hints.ai_canonname = NULL;
hints.ai_addr = NULL;
hints.ai_next = NULL;
s = getaddrinfo(NULL, str_my_port, &hints, &result);
if (s != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
return -1;
}
/* getaddrinfo() returns a list of address structures.
* Try each address until we successfully bind(2).
* If socket(2) (or bind(2)) fails, we (close the socket
* and) try the next address. */
for (rp = result; rp != NULL; rp = rp->ai_next) {
*p_sfd = socket(rp->ai_family, rp->ai_socktype,
rp->ai_protocol);
if (*p_sfd == -1)
continue;
if (bind(*p_sfd, rp->ai_addr, rp->ai_addrlen) == 0)
break; /* Success */
close(*p_sfd);
}
if (rp == NULL) { /* No address succeeded */
fprintf(stderr, "Could not bind\n");
return -1;
}
freeaddrinfo(result); /* No longer needed */
/* Second half */
/* get info about the server */
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
hints.ai_flags = 0;
hints.ai_protocol = 0; /* Any protocol */
s = getaddrinfo(str_server_addr, str_server_port, &hints, &result);
if (s != 0) {
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
return -1;
}
/*
for (rp = result; rp != NULL; rp = rp->ai_next) {
int tmp_df = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (tmp_df == -1) continue;
close(tmp_df);
}
*/
rp = result;
if (rp == NULL) { /* No address succeeded */
fprintf(stderr, "Could not connect\n");
return -1;
}
*srv = *rp;
return 0;
}
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