8171eb0b3d
A sort of quick hack for dhcpd to work as a client with lwip server. - The functionality is not changed unless --lwip switch is supplied. dhcpd does not use broadcast udp sockets but some sort of raw sockets and changes their behavior during their life by ioctls. - I thought there is no need to polute lwip just to make dhcp client work. Instead I decided to twist the client a little bit. - It is so far the only big collision I found between inet and lwip.
347 lines
8.6 KiB
C
347 lines
8.6 KiB
C
/* devices.c - Handle network devices.
|
|
* Author: Kees J. Bot
|
|
* 11 Jun 1999
|
|
*/
|
|
#include <sys/types.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
#include <string.h>
|
|
#include <limits.h>
|
|
#include <signal.h>
|
|
#include <time.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/asynchio.h>
|
|
#include <net/hton.h>
|
|
#include <net/gen/in.h>
|
|
#include <netinet/in.h>
|
|
#include <sys/socket.h>
|
|
#include <net/gen/ether.h>
|
|
#include <net/gen/eth_hdr.h>
|
|
#include <net/gen/eth_io.h>
|
|
#include <net/gen/ip_hdr.h>
|
|
#include <net/gen/ip_io.h>
|
|
#include <net/gen/udp.h>
|
|
#include <net/gen/udp_hdr.h>
|
|
#include <net/gen/udp_io.h>
|
|
#include <net/gen/dhcp.h>
|
|
#include "dhcpd.h"
|
|
|
|
void get_buf(buf_t **bp)
|
|
{
|
|
/* Allocate and return a buffer pointer iff *bp == nil. */
|
|
if (*bp != nil) {
|
|
/* Already has one. */
|
|
} else {
|
|
/* Get one from the heap. */
|
|
buf_t *new= allocate(sizeof(*new));
|
|
new->dhcp= (dhcp_t *) (new->buf + sizeof(eth_hdr_t)
|
|
+ sizeof(ip_hdr_t) + sizeof(udp_hdr_t));
|
|
new->udpio= ((udp_io_hdr_t *) new->dhcp) - 1;
|
|
new->udp= ((udp_hdr_t *) new->dhcp) - 1;
|
|
new->ip= ((ip_hdr_t *) new->udp) - 1;
|
|
new->eth= ((eth_hdr_t *) new->ip) - 1;
|
|
*bp= new;
|
|
}
|
|
}
|
|
|
|
void put_buf(buf_t **bp)
|
|
{
|
|
/* Return a buffer to the heap. */
|
|
if (*bp != nil) {
|
|
free(*bp);
|
|
*bp= nil;
|
|
}
|
|
}
|
|
|
|
void give_buf(buf_t **dbp, buf_t **sbp)
|
|
{
|
|
/* Hand over a buffer to another variable. */
|
|
put_buf(dbp);
|
|
*dbp= *sbp;
|
|
*sbp= nil;
|
|
}
|
|
|
|
#define N_FDS 16 /* Minix can go async on many fds. */
|
|
|
|
static fd_t fds[N_FDS]; /* List of open descriptors. */
|
|
static struct network *fdwaitq; /* Queue of nets waiting for fds. */
|
|
|
|
network_t *newnetwork(void)
|
|
{
|
|
/* Create and initialize a network structure. */
|
|
network_t *new;
|
|
|
|
new= allocate(sizeof(*new));
|
|
memset(new, 0, sizeof(*new));
|
|
new->hostname= nil;
|
|
new->solicit= NEVER;
|
|
new->sol_ct= -1;
|
|
return new;
|
|
}
|
|
|
|
void closefd(fd_t *fdp)
|
|
{
|
|
/* Close a descriptor. */
|
|
if (fdp->fdtype != FT_CLOSED) {
|
|
asyn_close(&asyn, fdp->fd);
|
|
close(fdp->fd);
|
|
fdp->fdtype= FT_CLOSED;
|
|
fdp->since= 0;
|
|
put_buf(&fdp->bp);
|
|
if (debug >= 3) printf("%s: Closed\n", fdp->device);
|
|
}
|
|
}
|
|
|
|
static void timeout(int signum)
|
|
{
|
|
/* nothing to do, ioctl will be aborted automatically */
|
|
if (alarm(1) < 0) fatal("alarm(1)");
|
|
}
|
|
|
|
int opendev(network_t *np, fdtype_t fdtype, int compete)
|
|
{
|
|
/* Make sure that a network has the proper device open and configured.
|
|
* Return true if this is made so, or false if the device doesn't exist.
|
|
* If compete is true then the caller competes for old descriptors.
|
|
* The errno value is EAGAIN if we're out of descriptors.
|
|
*/
|
|
fd_t *fdp, *fdold;
|
|
time_t oldest;
|
|
nwio_ethstat_t ethstat;
|
|
nwio_ethopt_t ethopt;
|
|
nwio_ipopt_t ipopt;
|
|
nwio_udpopt_t udpopt;
|
|
network_t **pqp;
|
|
static char devbytype[][4] = { "", "eth", "ip", "udp", "udp" };
|
|
|
|
/* Don't attempt to open higher level devices if not bound. */
|
|
if (!(np->flags & NF_BOUND) && fdtype > FT_ETHERNET) {
|
|
errno= EAGAIN;
|
|
return 0;
|
|
}
|
|
|
|
/* Check if already open / Find the oldest descriptor. */
|
|
fdold= nil;
|
|
oldest= NEVER;
|
|
for (fdp= fds; fdp < arraylimit(fds); fdp++) {
|
|
if (fdp->n == np->n && fdp->fdtype == fdtype) {
|
|
/* Already open. */
|
|
np->fdp= fdp;
|
|
return 1;
|
|
}
|
|
if (fdp->since <= oldest) { fdold= fdp; oldest= fdp->since; }
|
|
}
|
|
|
|
/* None free? Then wait for one to get old if so desired. */
|
|
if (fdold->fdtype != FT_CLOSED && !compete) {
|
|
errno= EAGAIN;
|
|
return 0;
|
|
}
|
|
|
|
if (!(np->flags & NF_WAIT)) {
|
|
for (pqp= &fdwaitq; *pqp != nil; pqp= &(*pqp)->wait) {}
|
|
*pqp= np;
|
|
np->wait= nil;
|
|
np->flags |= NF_WAIT;
|
|
}
|
|
|
|
/* We allow a net to keep a descriptor for half of the fast period. */
|
|
oldest += DELTA_FAST/2;
|
|
|
|
if (fdwaitq != np || (fdold->fdtype != FT_CLOSED && oldest > now)) {
|
|
/* This net is not the first in the queue, or the oldest isn't
|
|
* old enough. Forget it for now.
|
|
*/
|
|
if (oldest < event) event= oldest;
|
|
errno= EAGAIN;
|
|
return 0;
|
|
}
|
|
|
|
/* The oldest is mine. */
|
|
np->flags &= ~NF_WAIT;
|
|
fdwaitq= np->wait;
|
|
closefd(fdold);
|
|
|
|
/* Open the proper device in the proper mode. */
|
|
fdp= fdold;
|
|
fdp->n= np->n;
|
|
if (lwip && (fdtype == FT_ETHERNET || fdtype == FT_ICMP))
|
|
sprintf(fdp->device, "/dev/ip");
|
|
else
|
|
sprintf(fdp->device, "/dev/%s%d", devbytype[fdtype], np->n);
|
|
np->fdp= fdp;
|
|
|
|
if ((fdp->fd= open(fdp->device, O_RDWR)) < 0) {
|
|
if (errno == ENOENT || errno == ENODEV || errno == ENXIO) return 0;
|
|
fatal(fdp->device);
|
|
}
|
|
|
|
switch (fdtype) {
|
|
case FT_ETHERNET:
|
|
if (lwip) {
|
|
nwio_ipopt_t ipopt;
|
|
int result;
|
|
char ethdev[64];
|
|
int efd;
|
|
|
|
sprintf(ethdev, "/dev/eth%d", np->n);
|
|
|
|
if ((efd = open(fdp->device, O_RDWR)) < 0) {
|
|
if (errno == ENOENT || errno == ENODEV ||
|
|
errno == ENXIO)
|
|
return 0;
|
|
fatal(ethdev);
|
|
}
|
|
|
|
if (ioctl(efd, NWIOGETHSTAT, ðstat) < 0) {
|
|
/* Not an Ethernet. */
|
|
close(efd);
|
|
return 0;
|
|
}
|
|
close(efd);
|
|
|
|
np->eth= ethstat.nwes_addr;
|
|
|
|
ipopt.nwio_flags= NWIO_COPY | NWIO_PROTOSPEC;
|
|
ipopt.nwio_proto= 17; /* UDP */
|
|
result= ioctl (fdp->fd, NWIOSIPOPT, &ipopt);
|
|
if (result<0)
|
|
perror("ioctl (NWIOSIPOPT)"), exit(1);
|
|
|
|
break;
|
|
}
|
|
/* Cannot use NWIOGETHSTAT in non-blocking mode due to a race between
|
|
* the reply from the ethernet driver and the cancel message from VFS
|
|
* for reaching inet. Hence, a signal is used to interrupt NWIOGETHSTAT
|
|
* in case the driver isn't ready yet.
|
|
*/
|
|
if (signal(SIGALRM, timeout) == SIG_ERR) fatal("signal(SIGALRM)");
|
|
if (alarm(1) < 0) fatal("alarm(1)");
|
|
if (ioctl(np->fdp->fd, NWIOGETHSTAT, ðstat) < 0) {
|
|
/* Not an Ethernet. */
|
|
close(fdp->fd);
|
|
return 0;
|
|
}
|
|
if (alarm(0) < 0) fatal("alarm(0)");
|
|
np->eth= ethstat.nwes_addr;
|
|
ethopt.nweo_flags= NWEO_COPY | NWEO_EN_LOC | NWEO_EN_BROAD
|
|
| NWEO_REMANY | NWEO_TYPEANY | NWEO_RWDATALL;
|
|
|
|
if (ioctl(fdp->fd, NWIOSETHOPT, ðopt) < 0) {
|
|
fprintf(stderr, "%s: %s: Unable to set eth options: %s\n",
|
|
program, fdp->device, strerror(errno));
|
|
exit(1);
|
|
}
|
|
break;
|
|
|
|
case FT_ICMP:
|
|
ipopt.nwio_flags= NWIO_COPY | NWIO_EN_LOC | NWIO_EN_BROAD
|
|
| NWIO_REMANY | NWIO_PROTOSPEC
|
|
| NWIO_HDR_O_SPEC | NWIO_RWDATALL;
|
|
ipopt.nwio_tos= 0;
|
|
ipopt.nwio_ttl= 1;
|
|
ipopt.nwio_df= 0;
|
|
ipopt.nwio_hdropt.iho_opt_siz= 0;
|
|
ipopt.nwio_proto= IPPROTO_ICMP;
|
|
|
|
if (ioctl(fdp->fd, NWIOSIPOPT, &ipopt) < 0) {
|
|
fprintf(stderr, "%s: %s: Unable to set IP options: %s\n",
|
|
program, fdp->device, strerror(errno));
|
|
exit(1);
|
|
}
|
|
break;
|
|
|
|
case FT_BOOTPC:
|
|
if (lwip) {
|
|
struct sockaddr_in si_me;
|
|
|
|
close(fdp->fd);
|
|
fdp->fd = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
|
|
if (fdp->fd < 0)
|
|
return 0;
|
|
memset((char *) &si_me, 0, sizeof(si_me));
|
|
si_me.sin_family = AF_INET;
|
|
si_me.sin_addr.s_addr = htonl(INADDR_ANY);
|
|
si_me.sin_port = htons(port_client);
|
|
if (bind(fdp->fd, (struct sockaddr *) &si_me,
|
|
sizeof(si_me)) == -1) {
|
|
close(fdp->fd);
|
|
printf("DHCP : cannot bind client socket to port %d\n",
|
|
port_client);
|
|
return 0;
|
|
}
|
|
break;
|
|
}
|
|
udpopt.nwuo_flags= NWUO_COPY | NWUO_EN_LOC | NWUO_EN_BROAD
|
|
| NWUO_RP_ANY | NWUO_RA_ANY | NWUO_RWDATALL
|
|
| NWUO_DI_IPOPT | NWUO_LP_SET;
|
|
udpopt.nwuo_locport= port_client;
|
|
goto udp;
|
|
|
|
case FT_BOOTPS:
|
|
udpopt.nwuo_flags= NWUO_EXCL | NWUO_EN_LOC | NWUO_EN_BROAD
|
|
| NWUO_RP_ANY | NWUO_RA_ANY | NWUO_RWDATALL
|
|
| NWUO_DI_IPOPT | NWUO_LP_SET;
|
|
udpopt.nwuo_locport= port_server;
|
|
udp:
|
|
if (ioctl(fdp->fd, NWIOSUDPOPT, &udpopt) == -1) {
|
|
fprintf(stderr, "%s: %s: Unable to set UDP options: %s\n",
|
|
program, fdp->device, strerror(errno));
|
|
exit(1);
|
|
}
|
|
break;
|
|
|
|
default:;
|
|
}
|
|
|
|
fdp->fdtype= fdtype;
|
|
fdp->since= now;
|
|
if (debug >= 3) printf("%s: Opened\n", fdp->device);
|
|
return 1;
|
|
}
|
|
|
|
void closedev(network_t *np, fdtype_t fdtype)
|
|
{
|
|
/* We no longer need a given type of device to be open. */
|
|
fd_t *fdp;
|
|
|
|
for (fdp= fds; fdp < arraylimit(fds); fdp++) {
|
|
if (fdp->n == np->n && (fdp->fdtype == fdtype || fdtype == FT_ALL)) {
|
|
closefd(fdp);
|
|
}
|
|
}
|
|
}
|
|
|
|
char *ipdev(int n)
|
|
{
|
|
/* IP device for network #n. */
|
|
static char device[sizeof("/dev/ipNNN")];
|
|
|
|
sprintf(device, "/dev/ip%d", n);
|
|
return device;
|
|
}
|
|
|
|
void set_ipconf(char *device, ipaddr_t ip, ipaddr_t mask, unsigned mtu)
|
|
{
|
|
/* Set IP address and netmask of an IP device. */
|
|
int fd;
|
|
nwio_ipconf_t ipconf;
|
|
|
|
if (test > 0) return;
|
|
|
|
if ((fd= open(device, O_RDWR)) < 0) fatal(device);
|
|
ipconf.nwic_flags= NWIC_IPADDR_SET | NWIC_NETMASK_SET;
|
|
ipconf.nwic_ipaddr= ip;
|
|
ipconf.nwic_netmask= mask;
|
|
#ifdef NWIC_MTU_SET
|
|
if (mtu != 0) {
|
|
ipconf.nwic_flags |= NWIC_MTU_SET;
|
|
ipconf.nwic_mtu= mtu;
|
|
}
|
|
#endif
|
|
if (ioctl(fd, NWIOSIPCONF, &ipconf) < 0) fatal(device);
|
|
close(fd);
|
|
}
|