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netutils.c
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netutils.c
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#include "netutils.h"
#include "logutils.h"
#include "chinadns.h"
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stddef.h>
#include <errno.h>
#include <ctype.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include "radix.h"
#include <err.h>
#include <netdb.h>
/* since linux 3.9 */
#ifndef SO_REUSEPORT
#define SO_REUSEPORT 15
#endif
#define s6_addr8 __u6_addr.__u6_addr8
#define s6_addr16 __u6_addr.__u6_addr16
#define s6_addr32 __u6_addr.__u6_addr32
#define s6_addr __u6_addr.__u6_addr8
#define FILLIN_SIN(sin, addr) \
do { \
(sin).sin_len = sizeof(sin); \
(sin).sin_family = AF_INET; \
(sin).sin_addr = (addr); \
} while (0)
#define FILLIN_SIN6(sin6, addr) \
do { \
(sin6).sin6_len = sizeof(sin6); \
(sin6).sin6_family = AF_INET6; \
(sin6).sin6_addr = (addr); \
} while (0)
/* setsockopt(IPV6_V6ONLY) */
static inline void set_ipv6_only(int sockfd) {
if (setsockopt(sockfd, IPPROTO_IPV6, IPV6_V6ONLY, &(int){1}, sizeof(int))) {
LOGERR("[set_ipv6_only] setsockopt(%d, IPV6_V6ONLY): (%d) %s", sockfd, errno, strerror(errno));
exit(errno);
}
}
/* setsockopt(SO_REUSEADDR) */
static inline void set_reuse_addr(int sockfd) {
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &(int){1}, sizeof(int))) {
LOGERR("[set_reuse_addr] setsockopt(%d, SO_REUSEADDR): (%d) %s", sockfd, errno, strerror(errno));
exit(errno);
}
}
/* setsockopt(SO_REUSEPORT) */
void set_reuse_port(int sockfd) {
if (setsockopt(sockfd, SOL_SOCKET, SO_REUSEPORT, &(int){1}, sizeof(int))) {
LOGERR("[set_reuse_port] setsockopt(%d, SO_REUSEPORT): (%d) %s", sockfd, errno, strerror(errno));
exit(errno);
}
}
/* create a udp socket (v4/v6) */
int new_udp_socket(int family) {
int sockfd = socket(family, SOCK_DGRAM | SOCK_NONBLOCK, 0); /* since Linux 2.6.27 */
if (sockfd < 0) {
LOGERR("[new_udp_socket] failed to create udp%c socket: (%d) %s", family == AF_INET ? '4' : '6', errno, strerror(errno));
exit(errno);
}
if (family == AF_INET6) set_ipv6_only(sockfd);
set_reuse_addr(sockfd);
return sockfd;
}
/* AF_INET or AF_INET6 or -1(invalid) */
int get_ipstr_family(const char *ipstr) {
if (!ipstr) return -1;
char buffer[IPV6_BINADDR_LEN]; /* v4 or v6 */
if (inet_pton(AF_INET, ipstr, buffer) == 1) {
return AF_INET;
} else if (inet_pton(AF_INET6, ipstr, buffer) == 1) {
return AF_INET6;
} else {
return -1;
}
}
/* build ipv4 address structure */
static inline void build_socket_addr4(skaddr4_t *skaddr, const char *ipstr, portno_t port) {
skaddr->sin_family = AF_INET;
inet_pton(AF_INET, ipstr, &skaddr->sin_addr);
skaddr->sin_port = htons(port);
}
/* build ipv6 address structure */
static inline void build_socket_addr6(skaddr6_t *skaddr, const char *ipstr, portno_t port) {
skaddr->sin6_family = AF_INET6;
inet_pton(AF_INET6, ipstr, &skaddr->sin6_addr);
skaddr->sin6_port = htons(port);
}
/* build v4/v6 address structure */
void build_socket_addr(int family, void *skaddr, const char *ipstr, portno_t portno) {
if (family == AF_INET) {
build_socket_addr4(skaddr, ipstr, portno);
} else {
build_socket_addr6(skaddr, ipstr, portno);
}
}
/* parse ipv4 address structure */
static inline void parse_socket_addr4(const skaddr4_t *skaddr, char *ipstr, portno_t *port) {
inet_ntop(AF_INET, &skaddr->sin_addr, ipstr, INET_ADDRSTRLEN);
*port = ntohs(skaddr->sin_port);
}
/* parse ipv6 address structure */
static inline void parse_socket_addr6(const skaddr6_t *skaddr, char *ipstr, portno_t *port) {
inet_ntop(AF_INET6, &skaddr->sin6_addr, ipstr, INET6_ADDRSTRLEN);
*port = ntohs(skaddr->sin6_port);
}
/* parse v4/v6 address structure */
void parse_socket_addr(const void *skaddr, char *ipstr, portno_t *portno) {
if (((const skaddr4_t *)skaddr)->sin_family == AF_INET) {
parse_socket_addr4(skaddr, ipstr, portno);
} else {
parse_socket_addr6(skaddr, ipstr, portno);
}
}
struct radix_node_head *pfrkt_ip4;
struct radix_node_head *pfrkt_ip6;
//
// Purpose:
//
void trim( char *str )
{
char *start = str;
char *end = start + strlen( str );
while( --end >= start ) { /* trim right */
if( !isspace( *end ) )
break;
}
*(++end) = '\0';
while( isspace( *start ) ) /* trim left */
start++;
if( start != str ) /* there is a string */
memmove( str, start, end - start + 1 );
}
static void
pfr_prepare_network(union sockaddr_union *sa, int af, int net)
{
int i;
bzero(sa, sizeof(*sa));
if (af == AF_INET) {
sa->sin.sin_len = sizeof(sa->sin);
sa->sin.sin_family = AF_INET;
sa->sin.sin_addr.s_addr = net ? htonl(-1 << (32-net)) : 0;
} else if (af == AF_INET6) {
sa->sin6.sin6_len = sizeof(sa->sin6);
sa->sin6.sin6_family = AF_INET6;
for (i = 0; i < 4; i++) {
if (net <= 32) {
sa->sin6.sin6_addr.s6_addr32[i] =
net ? htonl(-1 << (32-net)) : 0;
break;
}
sa->sin6.sin6_addr.s6_addr32[i] = 0xFFFFFFFF;
net -= 32;
}
}
}
static void load_chnroute4(void)
{
char filename[256];
char ipstr[128];
char ip[64];
char maskstr[32];
FILE *fh;
union sockaddr_union sa, mask;
struct in_addr addr;
struct pfr_kentry *ke;
struct radix_node *rn;
sprintf(filename, "%s.txt", g_ipset_setname4);
fh = fopen(filename, "r");
if (fh == NULL) {
err(EXIT_FAILURE, "fopen failed");
}
while(fgets(ipstr, sizeof(ipstr)-1, fh) != NULL)
{
trim(ipstr);
char *s = strstr(ipstr, "/");
if(!s) {
continue;
}
memset(ip, 0, sizeof(ip));
memcpy(ip, ipstr, s-ipstr);
s++;
strcpy(maskstr, s);
addr.s_addr = inet_addr(ip);
FILLIN_SIN(sa.sin, addr);
pfr_prepare_network(&mask, AF_INET, atoi(maskstr));
ke = malloc(sizeof(struct pfr_kentry));
bzero(ke, sizeof(struct pfr_kentry));
FILLIN_SIN(ke->pfrke_sa.sin, addr);
ke->pfrke_af = AF_INET;
ke->pfrke_net = atoi(maskstr);
rn = rn_addroute(&ke->pfrke_sa, &mask, &pfrkt_ip4->rh, ke->pfrke_node);
}
fclose(fh);
}
static void load_chnroute6(void)
{
char filename[256];
char ipstr[128];
char ip[64];
char maskstr[32];
FILE *fh;
union sockaddr_union sa, mask;
struct in6_addr addr;
struct pfr_kentry *ke;
struct radix_node *rn;
struct addrinfo hints, *res;
sprintf(filename, "%s.txt", g_ipset_setname6);
fh = fopen(filename, "r");
if (fh == NULL) {
err(EXIT_FAILURE, "fopen failed");
}
while(fgets(ipstr, sizeof(ipstr)-1, fh) != NULL)
{
trim(ipstr);
char *s = strrchr(ipstr, '/');
if(!s) {
continue;
}
memset(ip, 0, sizeof(ip));
memcpy(ip, ipstr, s-ipstr);
s++;
strcpy(maskstr, s);
res = NULL;
memset(&hints, 0, sizeof(hints));
hints.ai_family = AF_INET6;
hints.ai_socktype = SOCK_DGRAM; /*dummy*/
hints.ai_flags = AI_NUMERICHOST;
if (getaddrinfo(ip, "0", &hints, &res) != 0) {
err(EXIT_FAILURE, "bad ipv6 addr:%s\n", ip);
}
memcpy(&addr,
&((struct sockaddr_in6 *)res->ai_addr)->sin6_addr,
sizeof(addr));
freeaddrinfo(res);
FILLIN_SIN6(sa.sin6, addr);
pfr_prepare_network(&mask, AF_INET6, atoi(maskstr));
ke = malloc(sizeof(struct pfr_kentry));
bzero(ke, sizeof(struct pfr_kentry));
FILLIN_SIN6(ke->pfrke_sa.sin6, addr);
ke->pfrke_af = AF_INET6;
ke->pfrke_net = atoi(maskstr);
rn = rn_addroute(&ke->pfrke_sa, &mask, &pfrkt_ip6->rh, ke->pfrke_node);
}
fclose(fh);
}
void chnroute_init(void) {
if (!rn_inithead((void **)&pfrkt_ip4, offsetof(struct sockaddr_in, sin_addr) * 8) ||
!rn_inithead((void **)&pfrkt_ip6, offsetof(struct sockaddr_in6, sin6_addr) * 8))
{
err(EXIT_FAILURE, "rn_inithead failed");
}
load_chnroute4();
load_chnroute6();
}
/* check given ipaddr is exists in ipset */
bool ipset_addr_is_exists(const void *addr_ptr, bool is_ipv4) {
union sockaddr_union sa;
struct in_addr addr;
struct in6_addr addr6;
void *rn;
if(is_ipv4) {
memcpy(&addr, addr_ptr, sizeof(struct in_addr));
FILLIN_SIN(sa.sin, addr);
rn = rn_match(&sa, &pfrkt_ip4->rh);
return rn != NULL;
}
memcpy(&addr6, addr_ptr, sizeof(struct in6_addr));
FILLIN_SIN6(sa.sin6, addr6);
rn = rn_match(&sa, &pfrkt_ip6->rh);
return rn != NULL;
}