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// Taken from ax25-tools 0.0.10-rc4 kissattach.c
// SPDX-License-Identifier: GPL-2.0-only
#include <stdio.h>
#define __USE_XOPEN
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <termios.h>
#include <fcntl.h>
#include <signal.h>
#include <ctype.h>
#include <netdb.h>
#include <syslog.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netax25/ax25.h>
#define FALSE 0
#define TRUE 1
static struct speed_struct {
int user_speed;
speed_t termios_speed;
} speed_table[] = {
{300, B300},
{600, B600},
{1200, B1200},
{2400, B2400},
{4800, B4800},
{9600, B9600},
{19200, B19200},
{38400, B38400},
#ifdef B57600
{57600, B57600},
#endif
#ifdef B115200
{115200, B115200},
#endif
#ifdef B230400
{230400, B230400},
#endif
#ifdef B460800
{460800, B460800},
#endif
{-1, B0}
};
static int tty_speed(int fd, int speed)
{
struct termios term;
struct speed_struct *s;
for (s = speed_table; s->user_speed != -1; s++)
if (s->user_speed == speed)
break;
if (s->user_speed == -1) {
fprintf(stderr, "tty_speed: invalid speed %d\n", speed);
return FALSE;
}
if (tcgetattr(fd, &term) == -1) {
perror("tty_speed: tcgetattr");
return FALSE;
}
cfsetispeed(&term, s->termios_speed);
cfsetospeed(&term, s->termios_speed);
if (tcsetattr(fd, TCSANOW, &term) == -1) {
perror("tty_speed: tcsetattr");
return FALSE;
}
return TRUE;
}
static int ax25_aton_entry(const char *name, char *buf)
{
int ct = 0;
int ssid = 0;
const char *p = name;
char c;
while (ct < 6) {
c = toupper(*p);
if (c == '-' || c == '\0')
break;
if (!isalnum(c)) {
printf("axutils: invalid symbol in callsign '%s'\n", name);
return -1;
}
buf[ct] = c << 1;
p++;
ct++;
}
while (ct < 6) {
buf[ct] = ' ' << 1;
ct++;
}
if (*p != '\0') {
p++;
if (sscanf(p, "%d", &ssid) != 1 || ssid < 0 || ssid > 15) {
printf("axutils: SSID must follow '-' and be numeric in the range 0-15 - '%s'\n", name);
return -1;
}
}
buf[6] = ((ssid + '0') << 1) & 0x1E;
return 0;
}
static int setifcall(int fd, char *name)
{
char call[7];
if (ax25_aton_entry(name, call) == -1)
return FALSE;
if (ioctl(fd, SIOCSIFHWADDR, call) != 0) {
close(fd);
perror("SIOCSIFHWADDR");
return FALSE;
}
return TRUE;
}
static int startiface(char *dev, int mtu, int allow_broadcast)
{
struct ifreq ifr;
int fd;
if ((fd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("socket");
return FALSE;
}
strcpy(ifr.ifr_name, dev);
ifr.ifr_mtu = mtu;
if (ioctl(fd, SIOCSIFMTU, &ifr) < 0) {
perror("SIOCSIFMTU");
return FALSE;
}
if (ioctl(fd, SIOCGIFFLAGS, &ifr) < 0) {
perror("SIOCGIFFLAGS");
return FALSE;
}
ifr.ifr_flags &= IFF_NOARP;
ifr.ifr_flags |= IFF_UP;
ifr.ifr_flags |= IFF_RUNNING;
if (allow_broadcast)
ifr.ifr_flags |= IFF_BROADCAST; /* samba broadcasts are a pain.. */
else
ifr.ifr_flags &= ~(IFF_BROADCAST); /* samba broadcasts are a pain.. */
if (ioctl(fd, SIOCSIFFLAGS, &ifr) < 0) {
perror("SIOCSIFFLAGS");
return FALSE;
}
close(fd);
return TRUE;
}
int32_t kissattach(
char *callsign,
int32_t speed,
int32_t mtu,
char *kttyname,
int32_t allow_broadcast)
{
int fd;
int disc = N_AX25;
char dev[64];
if ((fd = open(kttyname, O_RDONLY | O_NONBLOCK)) == -1) {
perror("open");
return 0;
}
if (speed != 0 && !tty_speed(fd, speed))
return 0;
if (ioctl(fd, TIOCSETD, &disc) == -1) {
//Error setting line discipline
perror("TIOCSETD");
fprintf(stderr, "Are you sure you have enabled %s support in the kernel\n",
disc == N_AX25 ? "MKISS" : "6PACK");
fprintf(stderr, "or, if you made it a module, that the module is loaded?\n");
return 0;
}
if (ioctl(fd, SIOCGIFNAME, dev) == -1) {
perror("SIOCGIFNAME");
return 0;
}
if (!setifcall(fd, callsign))
return 0;
/* Now set the encapsulation */
int v = 4;
if (ioctl(fd, SIOCSIFENCAP, &v) == -1) {
perror("SIOCSIFENCAP");
return 0;
}
/* ax25 ifaces should not really need to have an IP address assigned to */
if (!startiface(dev, mtu, allow_broadcast))
return 0;
return 1;
}
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