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dhcpreplay: code shrink, -40 bytes

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This commit is contained in:
Denis Vlasenko 2007-09-30 17:54:10 +00:00
parent 5fb09656ca
commit d7b3350eb3
1 changed files with 29 additions and 31 deletions
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60
networking/udhcp/dhcprelay.c
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@ -11,17 +11,15 @@
*/ */
#include "common.h" #include "common.h"
#include "dhcpd.h"
#include "options.h" #include "options.h"
/* constants */ /* constants */
#define SELECT_TIMEOUT 5 /* select timeout in sec. */ #define SELECT_TIMEOUT 5 /* select timeout in sec. */
#define MAX_LIFETIME 2*60 /* lifetime of an xid entry in sec. */ #define MAX_LIFETIME 2*60 /* lifetime of an xid entry in sec. */
#define MAX_INTERFACES 9
/* This list holds information about clients. The xid_* functions manipulate this list. */ /* This list holds information about clients. The xid_* functions manipulate this list. */
struct xid_item { struct xid_item {
time_t timestamp; unsigned timestamp;
int client; int client;
uint32_t xid; uint32_t xid;
struct sockaddr_in ip; struct sockaddr_in ip;
@ -41,7 +39,7 @@ static struct xid_item *xid_add(uint32_t xid, struct sockaddr_in *ip, int client
item->ip = *ip; item->ip = *ip;
item->xid = xid; item->xid = xid;
item->client = client; item->client = client;
item->timestamp = time(NULL); item->timestamp = monotonic_sec();
item->next = dhcprelay_xid_list.next; item->next = dhcprelay_xid_list.next;
dhcprelay_xid_list.next = item; dhcprelay_xid_list.next = item;
@ -52,7 +50,7 @@ static void xid_expire(void)
{ {
struct xid_item *item = dhcprelay_xid_list.next; struct xid_item *item = dhcprelay_xid_list.next;
struct xid_item *last = &dhcprelay_xid_list; struct xid_item *last = &dhcprelay_xid_list;
time_t current_time = time(NULL); unsigned current_time = monotonic_sec();
while (item != NULL) { while (item != NULL) {
if ((current_time - item->timestamp) > MAX_LIFETIME) { if ((current_time - item->timestamp) > MAX_LIFETIME) {
@ -120,31 +118,32 @@ static int get_dhcp_packet_type(struct dhcpMessage *p)
*/ */
static char **get_client_devices(char *dev_list, int *client_number) static char **get_client_devices(char *dev_list, int *client_number)
{ {
char *s, *list, **client_dev; char *s, **client_dev;
int i, cn; int i, cn;
/* copy list */ /* copy list */
list = xstrdup(dev_list); dev_list = xstrdup(dev_list);
if (list == NULL) return NULL;
/* get number of items */ /* get number of items, replace ',' with NULs */
for (s = dev_list, cn = 1; *s; s++) s = dev_list;
if (*s == ',') cn = 1;
while (*s) {
if (*s == ',') {
*s = '\0';
cn++; cn++;
}
client_dev = xzalloc(cn * sizeof(*client_dev)); s++;
/* parse list */
s = strtok(list, ",");
i = 0;
while (s != NULL) {
client_dev[i++] = xstrdup(s);
s = strtok(NULL, ",");
} }
/* free copy and exit */
free(list);
*client_number = cn; *client_number = cn;
/* create vector of pointers */
client_dev = xzalloc(cn * sizeof(*client_dev));
client_dev[0] = dev_list;
i = 1;
while (i != cn) {
client_dev[i] = client_dev[i - 1] + strlen(client_dev[i - 1]) + 1;
i++;
}
return client_dev; return client_dev;
} }
@ -161,7 +160,7 @@ static int init_sockets(char **client, int num_clients,
for (i = 1; i < num_clients; i++) { for (i = 1; i < num_clients; i++) {
/* listen for clients on bootps */ /* listen for clients on bootps */
fds[i] = listen_socket(/*NADDR_ANY,*/ 67, client[i-1]); fds[i] = listen_socket(/*INADDR_ANY,*/ 67, client[i-1]);
if (fds[i] > n) if (fds[i] > n)
n = fds[i]; n = fds[i];
} }
@ -224,8 +223,6 @@ static void pass_back(struct dhcpMessage *p, int packet_len, int *fds)
if (item->ip.sin_addr.s_addr == htonl(INADDR_ANY)) if (item->ip.sin_addr.s_addr == htonl(INADDR_ANY))
item->ip.sin_addr.s_addr = htonl(INADDR_BROADCAST); item->ip.sin_addr.s_addr = htonl(INADDR_BROADCAST);
if (item->client > MAX_INTERFACES)
return;
res = sendto(fds[item->client], p, packet_len, 0, (struct sockaddr*)(&item->ip), res = sendto(fds[item->client], p, packet_len, 0, (struct sockaddr*)(&item->ip),
sizeof(item->ip)); sizeof(item->ip));
if (res != packet_len) { if (res != packet_len) {
@ -285,7 +282,8 @@ static void dhcprelay_loop(int *fds, int num_sockets, int max_socket, char **cli
int dhcprelay_main(int argc, char **argv); int dhcprelay_main(int argc, char **argv);
int dhcprelay_main(int argc, char **argv) int dhcprelay_main(int argc, char **argv)
{ {
int num_sockets, max_socket, fds[MAX_INTERFACES]; int num_sockets, max_socket;
int *fds;
uint32_t gw_ip; uint32_t gw_ip;
char **clients; char **clients;
struct sockaddr_in server_addr; struct sockaddr_in server_addr;
@ -300,10 +298,10 @@ int dhcprelay_main(int argc, char **argv)
} else { } else {
bb_show_usage(); bb_show_usage();
} }
clients = get_client_devices(argv[1], &num_sockets);
if (!clients) return 0;
clients = get_client_devices(argv[1], &num_sockets);
num_sockets++; /* for server socket at fds[0] */ num_sockets++; /* for server socket at fds[0] */
fds = xmalloc(num_sockets * sizeof(fds[0]));
max_socket = init_sockets(clients, num_sockets, argv[2], fds); max_socket = init_sockets(clients, num_sockets, argv[2], fds);
if (read_interface(argv[2], NULL, &gw_ip, NULL)) if (read_interface(argv[2], NULL, &gw_ip, NULL))