minix/servers/lwip/inet_config.c

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/*
inet/inet_config.c
Created: Nov 11, 1992 by Philip Homburg
Modified: Apr 07, 2001 by Kees J. Bot
Read the configuration file and fill in the xx_conf[] arrays.
Copyright 1995 Philip Homburg
*/
#define _POSIX_SOURCE 1
#define _NETBSD_SOURCE 1
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <minix/type.h>
#include <minix/sysutil.h>
#include <minix/syslib.h>
#include "inet_config.h"
#include "proto.h"
#include <minix/netsock.h>
struct eth_conf eth_conf[IP_PORT_MAX];
struct psip_conf psip_conf[IP_PORT_MAX];
struct ip_conf ip_conf[IP_PORT_MAX];
struct tcp_conf tcp_conf[IP_PORT_MAX];
struct udp_conf udp_conf[IP_PORT_MAX];
dev_t ip_dev;
int eth_conf_nr;
int psip_conf_nr;
int ip_conf_nr;
int tcp_conf_nr;
int udp_conf_nr;
int ip_forward_directed_bcast= 0; /* Default is off */
static int ifdefault= -1; /* Default network interface. */
__dead
static void fatal(const char *label)
{
printf("init: %s: %s\n", label, strerror(errno));
exit(1);
}
static void check_mknod(const char *device, mode_t mode, int minor)
/* Check if a device exists with the proper device number. */
{
dev_t dev;
dev= (ip_dev & 0xFF00) | minor;
unlink(device);
if (mknod(device, S_IFCHR | mode, dev) < 0) fatal(device);
printf("mknod %s c %d %d\n", device, (ip_dev >> 8), minor);
}
static int cfg_fd;
static char word[16];
static unsigned char line[256], *lineptr;
static unsigned int linenr;
static __dead void error(void)
{
printf("inet: error on line %u\n", linenr);
exit(1);
}
static int nextline(void)
{
/* Read a line from the configuration file, to be used by subsequent
* token() calls. Skip empty lines, and lines where the first character
* after leading "whitespace" is '#'. The last line of the file need
* not be terminated by a newline. Return 1 if a line was read in
* successfully, and 0 on EOF or error.
*/
unsigned char *lp, c;
int r, skip;
lineptr = lp = line;
linenr++;
skip = -1;
while ((r = read(cfg_fd, &c, 1)) == 1) {
if (c == '\n') {
if (skip == 0)
break;
linenr++;
skip = -1;
continue;
}
if (skip == -1 && c > ' ')
skip = (c == '#');
if (skip == 0 && lp < (unsigned char *) line + sizeof(line)-1)
*lp++ = c;
}
*lp = 0;
return (r == 1 || lp != line);
}
static void token(int need)
{
/* Read a word from the configuration line. Return a null string on
* EOL. Return a punctuation as a one character word. If 'need' is
* true then an actual word is expected at this point, so err out if
* not.
*/
unsigned char *wp;
static unsigned char c= '\n';
wp= (unsigned char *) word;
*wp = 0;
while (c <= ' ') {
if (*lineptr == 0) {
if (need) error();
return;
}
c = *lineptr++;
}
do {
if (wp < (unsigned char *) word + sizeof(word)-1) *wp++ = c;
c = (*lineptr != 0) ? *lineptr++ : ' ';
if (word[0] == ';' || word[0] == '{' || word[0] == '}') {
if (need) error();
break;
}
} while (c > ' ' && c != ';' && c != '{' && c != '}');
*wp = 0;
}
void inet_read_conf(void)
{
int ifno, enable;
struct stat st;
{ static int first= 1;
if (!first)
panic(( "LWIP : read_conf: called a second time" ));
first= 0;
#if 0
*(u8_t *)0 = 0xcc; /* INT 3 */
#endif
}
/* Open the configuration file. */
if ((cfg_fd= open(PATH_INET_CONF, O_RDONLY)) == -1)
fatal(PATH_INET_CONF);
while (nextline()) {
token(1);
char drv_name[128];
unsigned int instance;
if (strncmp(word, "eth", 3) == 0) {
ifno = strtol(word+3, NULL, 10);
token(1);
#if 1
strncpy(drv_name, word, 128);
#else
sprintf(drv_name, "%s_debug", word);
#endif
token(1);
instance = strtol(word, NULL, 10);
} else {
printf("inet: Unknown device '%s'\n", word);
error();
}
enable= 7; /* 1 = IP, 2 = TCP, 4 = UDP */
token(0);
if (word[0] == '{') {
token(0);
while (word[0] != '}') {
if (strcmp(word, "default") == 0) {
if (ifdefault != -1) {
printf(
"inet: ip%d and ip%d can't both be default\n",
ifdefault, ifno);
error();
}
ifdefault= ifno;
token(0);
} else
if (strcmp(word, "no") == 0) {
token(1);
if (strcmp(word, "ip") == 0) {
enable= 0;
} else
if (strcmp(word, "tcp") == 0) {
enable &= ~2;
} else
if (strcmp(word, "udp") == 0) {
enable &= ~4;
} else {
printf(
"inet: Can't do 'no %s'\n",
word);
exit(1);
}
token(0);
} else {
printf("inet: Unknown option '%s'\n",
word);
exit(1);
}
if (word[0] == ';') token(0);
else
if (word[0] != '}') error();
}
token(0);
}
if (word[0] != ';' && word[0] != 0) error();
nic_assign_driver("eth", ifno, drv_name, instance, ifdefault == ifno);
}
if (ifdefault == -1) {
printf("inet: No networks or no default network defined\n");
exit(1);
}
/* Set umask 0 so we can creat mode 666 devices. */
(void) umask(0);
/* See what the device number of /dev/ip is. That's what we
* used last time for the network devices, so we keep doing so.
*/
if (stat("/dev/ip", &st) < 0) fatal("/dev/ip");
ip_dev= st.st_rdev;
/* create protocol devices */
check_mknod("/dev/ip", 0600, SOCK_TYPE_IP);
check_mknod("/dev/tcp", 0666, SOCK_TYPE_TCP);
check_mknod("/dev/udp", 0666, SOCK_TYPE_UDP);
/*
* create hw devices, to configure ip we need also ip devices for each
*/
check_mknod("/dev/ip0", 0600, SOCK_TYPES + 0);
check_mknod("/dev/eth0", 0600, SOCK_TYPES + 0);
check_mknod("/dev/ip1", 0600, SOCK_TYPES + 1);
check_mknod("/dev/eth1", 0600, SOCK_TYPES + 1);
check_mknod("/dev/ip2", 0600, SOCK_TYPES + 2);
check_mknod("/dev/eth2", 0600, SOCK_TYPES + 2);
check_mknod("/dev/ip3", 0600, SOCK_TYPES + 3);
check_mknod("/dev/eth3", 0600, SOCK_TYPES + 3);
check_mknod("/dev/ip4", 0600, SOCK_TYPES + 4);
check_mknod("/dev/eth4", 0600, SOCK_TYPES + 4);
}