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#include <stdio.h>
#include <string.h>
#include <assert.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <netinet/in.h>
#include <errno.h>
#include <poll.h>
#include "util.h"
uint32_t
sock_get_ipv4_addr(int fd)
{
struct sockaddr_storage storage;
struct sockaddr_in *own = (struct sockaddr_in *) &storage;
socklen_t addrlen = sizeof(struct sockaddr_storage);
assert(getsockname(fd, (struct sockaddr *) &storage, &addrlen) == 0);
return own->sin_addr.s_addr;
}
uint32_t
sock_get_netmask(int fd)
{
#if 0
struct ifreq ifreq;
#endif
struct ifconf ifconf;
struct ifreq ifreqs[16];
int i;
uint32_t own_ip, ip;
own_ip = sock_get_ipv4_addr(fd);
#if 0
memset(&ifreq, 0, sizeof ifreq);
#endif
ifconf.ifc_len = sizeof ifreqs;
ifconf.ifc_req = ifreqs;
if (ioctl(fd, SIOCGIFCONF, &ifconf) < 0) {
fprintf(stderr, "retrieving interfaces failed: %s\n",
strerror(errno));
return 0;
}
for (i = 0; i < ifconf.ifc_len/sizeof(ifreqs[0]); i++) {
ip = ((struct sockaddr_in *) &ifreqs[i].ifr_addr)->sin_addr.s_addr;
printf("ifname: %s: ip: %08x", ifreqs[i].ifr_name,
((struct sockaddr_in *) &ifreqs[i].ifr_addr)->sin_addr.s_addr);
if (ip == own_ip) {
if (ioctl(fd, SIOCGIFNETMASK, &ifreqs[i]) < 0)
continue;
printf(", netmask: %08x\n",
((struct sockaddr_in *) &ifreqs[i].ifr_netmask)->sin_addr.s_addr);
return ((struct sockaddr_in *) &ifreqs[i].ifr_netmask)->sin_addr.s_addr;
}
printf("\n");
}
/* Failure */
return 0;
#if 0
/* FIXME: do not hardcode interface name */
strcpy(ifreq.ifr_name, "wlp3s0");
if (ioctl(fd, SIOCGIFNETMASK, &ifreq) < 0) {
fprintf(stderr, "get netmask failed: %s\n", strerror(errno));
return 0;
}
return ((struct sockaddr_in *) &ifreq.ifr_netmask)->sin_addr.s_addr;
#endif
}
uint32_t
sock_get_peer_ipv4_addr(int fd)
{
struct sockaddr_storage storage;
struct sockaddr_in *own = (struct sockaddr_in *) &storage;
socklen_t addrlen = sizeof(struct sockaddr_storage);
assert(getpeername(fd, (struct sockaddr *) &storage, &addrlen) == 0);
return own->sin_addr.s_addr;
}
void
set_ip(uint8_t *ipbuf, uint32_t ip)
{
ipbuf[0] = (ip & 0xFF);
ipbuf[1] = (ip & 0xFF00) >> 8;
ipbuf[2] = (ip & 0xFF0000) >> 16;
ipbuf[3] = (ip & 0xFF000000) >> 24;
}
int
bind_socket(int socktype, const char *host, const char *port)
{
struct addrinfo hints, *result, *rp;
int reuseaddr = 1, s;
int fd;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_INET;
hints.ai_socktype = socktype;
printf("bind to host: %s, port: %s\n", host, port);
s = getaddrinfo(host, 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) {
fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (fd == -1)
continue;
if (setsockopt(fd, SOL_SOCKET, SO_REUSEADDR,
&reuseaddr, sizeof(reuseaddr)) == -1)
continue;
/*ip = ((struct sockaddr_in *)rp->ai_addr)->sin_addr.s_addr;*/
if (bind(fd, rp->ai_addr, rp->ai_addrlen) == 0)
break;
close(fd);
}
freeaddrinfo(result);
if (rp == NULL) {
fprintf(stderr, "Failed to bind: %s\n", strerror(errno));
return -1;
}
if (socktype == SOCK_STREAM &&
listen(fd, 1) < 0) {
fprintf(stderr, "Failed to listen: %s\n", strerror(errno));
close(fd);
return -1;
}
return fd;
}
int
connect_to_host(int socktype, const char *host, const char *port)
{
struct addrinfo hints, *result, *rp;
int fd, s;
memset(&hints, 0, sizeof hints);
hints.ai_family = AF_INET;
hints.ai_socktype = socktype;
printf("connect to host: %s, port: %s\n", host, port);
s = getaddrinfo(host, 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) {
fd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
if (fd == -1)
continue;
if (connect(fd, rp->ai_addr, rp->ai_addrlen) != -1)
break;
close(fd);
}
freeaddrinfo(result);
if (rp == NULL) {
fprintf(stderr, "Failed to bind: %s\n", strerror(errno));
return -1;
}
return fd;
}
/* From systemd:src/shared/util.c */
ssize_t
loop_read(int fd, void *buf, size_t nbytes, uint8_t do_poll)
{
uint8_t *p;
ssize_t n = 0;
assert(fd >= 0);
assert(buf);
p = buf;
while (nbytes > 0) {
ssize_t k;
if ((k = read(fd, p, nbytes)) <= 0) {
if (k < 0 && errno == EINTR)
continue;
if (k < 0 && errno == EAGAIN && do_poll) {
struct pollfd pollfd;
memset(&pollfd, 0, sizeof pollfd);
pollfd.fd = fd;
pollfd.events = POLLIN;
if (poll(&pollfd, 1, -1) < 0) {
if (errno == EINTR)
continue;
return n > 0 ? n : -errno;
}
if (pollfd.revents != POLLIN)
return n > 0 ? n : -EIO;
continue;
}
return n > 0 ? n : (k < 0 ? -errno : 0);
}
p += k;
nbytes -= k;
n += k;
}
return n;
}
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