mirror of
https://github.com/sheumann/hush.git
synced 2024-09-12 00:55:11 +00:00
udhcp: MAC_BCAST_ADDR and blank_chaddr are in fact constant, move to rodata.
a few global variables reduced to smallints function old new delta add_lease 75 227 +152 static.blank_chaddr - 16 +16 MAC_BCAST_ADDR - 6 +6 sockfd 4 8 +4 udhcp_run_script 1153 1155 +2 state 8 5 -3 listen_mode 4 1 -3 perform_release 152 148 -4 fd 8 4 -4 blank_chaddr 16 - -16 udhcpc_main 2518 2497 -21 .rodata 131864 131832 -32 oldest_expired_lease 61 - -61 clear_lease 127 - -127 ------------------------------------------------------------------------------ (add/remove: 2/3 grow/shrink: 3/6 up/down: 180/-271) Total: -91 bytes
This commit is contained in:
parent
bb5b01c7c7
commit
fbd2918f5c
@ -15,6 +15,8 @@
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#include "common.h"
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const uint8_t MAC_BCAST_ADDR[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
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long uptime(void)
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{
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struct sysinfo info;
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@ -14,8 +14,7 @@
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#define DEFAULT_SCRIPT "/usr/share/udhcpc/default.script"
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#define COMBINED_BINARY
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extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */
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/*** packet.h ***/
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@ -52,7 +51,8 @@ int udhcp_get_packet(struct dhcpMessage *packet, int fd);
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uint16_t udhcp_checksum(void *addr, int count);
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int udhcp_raw_packet(struct dhcpMessage *payload,
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uint32_t source_ip, int source_port,
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uint32_t dest_ip, int dest_port, uint8_t *dest_arp, int ifindex);
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uint32_t dest_ip, int dest_port,
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const uint8_t *dest_arp, int ifindex);
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int udhcp_kernel_packet(struct dhcpMessage *payload,
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uint32_t source_ip, int source_port,
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uint32_t dest_ip, int dest_port);
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@ -17,22 +17,23 @@
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#include "options.h"
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static int state;
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/* Something is definitely wrong here. IPv4 addresses
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* in variables of type long?? BTW, we use inet_ntoa()
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* in the code. Manpage says that struct in_addr has a member of type long (!)
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* which holds IPv4 address, and the struct is passed by value (!!)
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*/
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static unsigned long timeout;
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static unsigned long requested_ip; /* = 0 */
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static uint32_t server_addr;
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static unsigned long timeout;
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static int packet_num; /* = 0 */
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static int fd = -1;
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static int sockfd = -1;
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#define LISTEN_NONE 0
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#define LISTEN_KERNEL 1
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#define LISTEN_RAW 2
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static int listen_mode;
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static smallint listen_mode;
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static smallint state;
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struct client_config_t client_config;
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@ -42,8 +43,10 @@ static void change_mode(int new_mode)
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{
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DEBUG("entering %s listen mode",
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new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
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if (fd >= 0) close(fd);
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fd = -1;
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if (sockfd >= 0) {
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close(sockfd);
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sockfd = -1;
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}
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listen_mode = new_mode;
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}
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@ -111,6 +114,7 @@ static void client_background(void)
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* If that will be properly disabled for NOMMU, client_background()
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* will work on NOMMU too */
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#else
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// chdir(/) is problematic. Imagine that e.g. pidfile name is RELATIVE! what will unlink do then, eh?
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bb_daemonize(DAEMON_CHDIR_ROOT);
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logmode &= ~LOGMODE_STDIO;
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#endif
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@ -289,13 +293,13 @@ int udhcpc_main(int argc, char **argv)
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tv.tv_sec = timeout - uptime();
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tv.tv_usec = 0;
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if (listen_mode != LISTEN_NONE && fd < 0) {
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if (listen_mode != LISTEN_NONE && sockfd < 0) {
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if (listen_mode == LISTEN_KERNEL)
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fd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
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sockfd = listen_socket(INADDR_ANY, CLIENT_PORT, client_config.interface);
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else
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fd = raw_socket(client_config.ifindex);
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sockfd = raw_socket(client_config.ifindex);
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}
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max_fd = udhcp_sp_fd_set(&rfds, fd);
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max_fd = udhcp_sp_fd_set(&rfds, sockfd);
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if (tv.tv_sec > 0) {
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DEBUG("Waiting on select...");
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@ -342,7 +346,8 @@ int udhcpc_main(int argc, char **argv)
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packet_num++;
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} else {
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/* timed out, go back to init state */
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if (state == RENEW_REQUESTED) udhcp_run_script(NULL, "deconfig");
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if (state == RENEW_REQUESTED)
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udhcp_run_script(NULL, "deconfig");
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state = INIT_SELECTING;
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timeout = now;
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packet_num = 0;
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@ -393,12 +398,12 @@ int udhcpc_main(int argc, char **argv)
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timeout = 0x7fffffff;
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break;
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}
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} else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(fd, &rfds)) {
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} else if (retval > 0 && listen_mode != LISTEN_NONE && FD_ISSET(sockfd, &rfds)) {
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/* a packet is ready, read it */
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if (listen_mode == LISTEN_KERNEL)
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len = udhcp_get_packet(&packet, fd);
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else len = get_raw_packet(&packet, fd);
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len = udhcp_get_packet(&packet, sockfd);
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else len = get_raw_packet(&packet, sockfd);
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if (len == -1 && errno != EINTR) {
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DEBUG("error on read, %s, reopening socket", strerror(errno));
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@ -418,7 +423,8 @@ int udhcpc_main(int argc, char **argv)
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continue;
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}
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if ((message = get_option(&packet, DHCP_MESSAGE_TYPE)) == NULL) {
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message = get_option(&packet, DHCP_MESSAGE_TYPE);
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if (message == NULL) {
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bb_error_msg("cannot get option from packet - ignoring");
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continue;
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}
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@ -14,81 +14,6 @@
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/* where to find the DHCP server configuration file */
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#define DHCPD_CONF_FILE "/etc/udhcpd.conf"
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/*****************************************************************/
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/* Do not modify below here unless you know what you are doing!! */
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/*****************************************************************/
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/* DHCP protocol -- see RFC 2131 */
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#define SERVER_PORT 67
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#define CLIENT_PORT 68
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#define DHCP_MAGIC 0x63825363
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/* DHCP option codes (partial list) */
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#define DHCP_PADDING 0x00
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#define DHCP_SUBNET 0x01
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#define DHCP_TIME_OFFSET 0x02
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#define DHCP_ROUTER 0x03
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#define DHCP_TIME_SERVER 0x04
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#define DHCP_NAME_SERVER 0x05
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#define DHCP_DNS_SERVER 0x06
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#define DHCP_LOG_SERVER 0x07
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#define DHCP_COOKIE_SERVER 0x08
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#define DHCP_LPR_SERVER 0x09
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#define DHCP_HOST_NAME 0x0c
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#define DHCP_BOOT_SIZE 0x0d
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#define DHCP_DOMAIN_NAME 0x0f
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#define DHCP_SWAP_SERVER 0x10
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#define DHCP_ROOT_PATH 0x11
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#define DHCP_IP_TTL 0x17
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#define DHCP_MTU 0x1a
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#define DHCP_BROADCAST 0x1c
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#define DHCP_NTP_SERVER 0x2a
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#define DHCP_WINS_SERVER 0x2c
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#define DHCP_REQUESTED_IP 0x32
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#define DHCP_LEASE_TIME 0x33
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#define DHCP_OPTION_OVER 0x34
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#define DHCP_MESSAGE_TYPE 0x35
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#define DHCP_SERVER_ID 0x36
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#define DHCP_PARAM_REQ 0x37
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#define DHCP_MESSAGE 0x38
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#define DHCP_MAX_SIZE 0x39
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#define DHCP_T1 0x3a
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#define DHCP_T2 0x3b
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#define DHCP_VENDOR 0x3c
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#define DHCP_CLIENT_ID 0x3d
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#define DHCP_FQDN 0x51
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#define DHCP_END 0xFF
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#define BOOTREQUEST 1
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#define BOOTREPLY 2
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#define ETH_10MB 1
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#define ETH_10MB_LEN 6
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#define DHCPDISCOVER 1
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#define DHCPOFFER 2
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#define DHCPREQUEST 3
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#define DHCPDECLINE 4
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#define DHCPACK 5
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#define DHCPNAK 6
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#define DHCPRELEASE 7
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#define DHCPINFORM 8
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#define BROADCAST_FLAG 0x8000
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#define OPTION_FIELD 0
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#define FILE_FIELD 1
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#define SNAME_FIELD 2
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/* miscellaneous defines */
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#define MAC_BCAST_ADDR (uint8_t *) "\xff\xff\xff\xff\xff\xff"
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#define OPT_CODE 0
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#define OPT_LEN 1
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#define OPT_DATA 2
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struct option_set {
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uint8_t *data;
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struct option_set *next;
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@ -140,13 +65,9 @@ struct dhcpOfferedAddr {
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uint32_t expires; /* host order */
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};
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extern uint8_t blank_chaddr[];
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void clear_lease(uint8_t *chaddr, uint32_t yiaddr);
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struct dhcpOfferedAddr *add_lease(uint8_t *chaddr, uint32_t yiaddr, unsigned long lease);
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struct dhcpOfferedAddr *add_lease(const uint8_t *chaddr, uint32_t yiaddr, unsigned long lease);
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int lease_expired(struct dhcpOfferedAddr *lease);
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struct dhcpOfferedAddr *oldest_expired_lease(void);
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struct dhcpOfferedAddr *find_lease_by_chaddr(uint8_t *chaddr);
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struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr);
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struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr);
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uint32_t find_address(int check_expired);
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#include "dhcpd.h"
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uint8_t blank_chaddr[] = {[0 ... 15] = 0};
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/* Find the oldest expired lease, NULL if there are no expired leases */
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static struct dhcpOfferedAddr *oldest_expired_lease(void)
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{
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struct dhcpOfferedAddr *oldest = NULL;
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unsigned long oldest_lease = time(0);
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unsigned i;
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for (i = 0; i < server_config.max_leases; i++)
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if (oldest_lease > leases[i].expires) {
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oldest_lease = leases[i].expires;
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oldest = &(leases[i]);
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}
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return oldest;
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}
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/* clear every lease out that chaddr OR yiaddr matches and is nonzero */
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void clear_lease(uint8_t *chaddr, uint32_t yiaddr)
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static void clear_lease(const uint8_t *chaddr, uint32_t yiaddr)
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{
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unsigned int i, j;
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unsigned i, j;
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for (j = 0; j < 16 && !chaddr[j]; j++);
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for (i = 0; i < server_config.max_leases; i++)
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if ((j != 16 && !memcmp(leases[i].chaddr, chaddr, 16)) ||
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(yiaddr && leases[i].yiaddr == yiaddr)) {
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if ((j != 16 && memcmp(leases[i].chaddr, chaddr, 16) != 0)
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|| (yiaddr && leases[i].yiaddr == yiaddr)
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) {
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memset(&(leases[i]), 0, sizeof(struct dhcpOfferedAddr));
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}
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}
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/* add a lease into the table, clearing out any old ones */
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struct dhcpOfferedAddr *add_lease(uint8_t *chaddr, uint32_t yiaddr, unsigned long lease)
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struct dhcpOfferedAddr *add_lease(const uint8_t *chaddr, uint32_t yiaddr, unsigned long lease)
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{
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struct dhcpOfferedAddr *oldest;
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@ -52,31 +68,14 @@ int lease_expired(struct dhcpOfferedAddr *lease)
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}
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/* Find the oldest expired lease, NULL if there are no expired leases */
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struct dhcpOfferedAddr *oldest_expired_lease(void)
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{
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struct dhcpOfferedAddr *oldest = NULL;
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unsigned long oldest_lease = time(0);
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unsigned int i;
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for (i = 0; i < server_config.max_leases; i++)
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if (oldest_lease > leases[i].expires) {
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oldest_lease = leases[i].expires;
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oldest = &(leases[i]);
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}
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return oldest;
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}
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/* Find the first lease that matches chaddr, NULL if no match */
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struct dhcpOfferedAddr *find_lease_by_chaddr(uint8_t *chaddr)
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struct dhcpOfferedAddr *find_lease_by_chaddr(const uint8_t *chaddr)
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{
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unsigned int i;
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unsigned i;
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for (i = 0; i < server_config.max_leases; i++)
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if (!memcmp(leases[i].chaddr, chaddr, 16)) return &(leases[i]);
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if (!memcmp(leases[i].chaddr, chaddr, 16))
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return &(leases[i]);
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return NULL;
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}
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@ -85,10 +84,11 @@ struct dhcpOfferedAddr *find_lease_by_chaddr(uint8_t *chaddr)
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/* Find the first lease that matches yiaddr, NULL is no match */
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struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr)
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{
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unsigned int i;
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unsigned i;
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for (i = 0; i < server_config.max_leases; i++)
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if (leases[i].yiaddr == yiaddr) return &(leases[i]);
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if (leases[i].yiaddr == yiaddr)
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return &(leases[i]);
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return NULL;
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}
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@ -97,6 +97,8 @@ struct dhcpOfferedAddr *find_lease_by_yiaddr(uint32_t yiaddr)
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/* check is an IP is taken, if it is, add it to the lease table */
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static int check_ip(uint32_t addr)
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{
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static const uint8_t blank_chaddr[16]; /* 16 zero bytes */
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struct in_addr temp;
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if (arpping(addr, server_config.server, server_config.arp, server_config.interface) == 0) {
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@ -105,7 +107,8 @@ static int check_ip(uint32_t addr)
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inet_ntoa(temp), server_config.conflict_time);
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add_lease(blank_chaddr, addr, server_config.conflict_time);
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return 1;
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} else return 0;
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}
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return 0;
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}
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@ -125,7 +128,7 @@ uint32_t find_address(int check_expired)
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/* ie, 192.168.55.255 */
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if ((addr & 0xFF) == 0xFF) continue;
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/* Only do if it isn't an assigned as a static lease */
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/* Only do if it isn't assigned as a static lease */
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if (!reservedIp(server_config.static_leases, htonl(addr))) {
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/* lease is not taken */
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@ -133,11 +136,10 @@ uint32_t find_address(int check_expired)
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lease = find_lease_by_yiaddr(ret);
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/* no lease or it expired and we are checking for expired leases */
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if ( (!lease || (check_expired && lease_expired(lease)))
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if ((!lease || (check_expired && lease_expired(lease)))
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&& /* and it isn't on the network */ !check_ip(ret)
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) {
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return ret;
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break;
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}
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}
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}
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@ -23,6 +23,80 @@ enum {
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#define OPTION_REQ 0x10 /* have the client request this option */
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#define OPTION_LIST 0x20 /* There can be a list of 1 or more of these */
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/*****************************************************************/
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/* Do not modify below here unless you know what you are doing!! */
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/*****************************************************************/
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/* DHCP protocol -- see RFC 2131 */
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#define SERVER_PORT 67
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#define CLIENT_PORT 68
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#define DHCP_MAGIC 0x63825363
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/* DHCP option codes (partial list) */
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#define DHCP_PADDING 0x00
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#define DHCP_SUBNET 0x01
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#define DHCP_TIME_OFFSET 0x02
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#define DHCP_ROUTER 0x03
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#define DHCP_TIME_SERVER 0x04
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#define DHCP_NAME_SERVER 0x05
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#define DHCP_DNS_SERVER 0x06
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#define DHCP_LOG_SERVER 0x07
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#define DHCP_COOKIE_SERVER 0x08
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#define DHCP_LPR_SERVER 0x09
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#define DHCP_HOST_NAME 0x0c
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#define DHCP_BOOT_SIZE 0x0d
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#define DHCP_DOMAIN_NAME 0x0f
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#define DHCP_SWAP_SERVER 0x10
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#define DHCP_ROOT_PATH 0x11
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#define DHCP_IP_TTL 0x17
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#define DHCP_MTU 0x1a
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#define DHCP_BROADCAST 0x1c
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#define DHCP_NTP_SERVER 0x2a
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#define DHCP_WINS_SERVER 0x2c
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#define DHCP_REQUESTED_IP 0x32
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#define DHCP_LEASE_TIME 0x33
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#define DHCP_OPTION_OVER 0x34
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#define DHCP_MESSAGE_TYPE 0x35
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#define DHCP_SERVER_ID 0x36
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#define DHCP_PARAM_REQ 0x37
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#define DHCP_MESSAGE 0x38
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#define DHCP_MAX_SIZE 0x39
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#define DHCP_T1 0x3a
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#define DHCP_T2 0x3b
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#define DHCP_VENDOR 0x3c
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#define DHCP_CLIENT_ID 0x3d
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#define DHCP_FQDN 0x51
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#define DHCP_END 0xFF
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#define BOOTREQUEST 1
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#define BOOTREPLY 2
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#define ETH_10MB 1
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#define ETH_10MB_LEN 6
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#define DHCPDISCOVER 1
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#define DHCPOFFER 2
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#define DHCPREQUEST 3
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#define DHCPDECLINE 4
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#define DHCPACK 5
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#define DHCPNAK 6
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#define DHCPRELEASE 7
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#define DHCPINFORM 8
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||||
|
||||
#define BROADCAST_FLAG 0x8000
|
||||
|
||||
#define OPTION_FIELD 0
|
||||
#define FILE_FIELD 1
|
||||
#define SNAME_FIELD 2
|
||||
|
||||
/* miscellaneous defines */
|
||||
#define OPT_CODE 0
|
||||
#define OPT_LEN 1
|
||||
#define OPT_DATA 2
|
||||
|
||||
struct dhcp_option {
|
||||
char name[12];
|
||||
char flags;
|
||||
|
@ -112,7 +112,7 @@ uint16_t udhcp_checksum(void *addr, int count)
|
||||
void BUG_sizeof_struct_udp_dhcp_packet_must_be_576(void);
|
||||
int udhcp_raw_packet(struct dhcpMessage *payload,
|
||||
uint32_t source_ip, int source_port,
|
||||
uint32_t dest_ip, int dest_port, uint8_t *dest_arp, int ifindex)
|
||||
uint32_t dest_ip, int dest_port, const uint8_t *dest_arp, int ifindex)
|
||||
{
|
||||
int fd;
|
||||
int result;
|
||||
|
@ -9,7 +9,6 @@
|
||||
*/
|
||||
|
||||
#include "common.h"
|
||||
#include "dhcpd.h"
|
||||
#include "dhcpc.h"
|
||||
#include "options.h"
|
||||
|
||||
@ -77,7 +76,7 @@ static char *alloc_fill_opts(uint8_t *option, const struct dhcp_option *type_p)
|
||||
switch (type) {
|
||||
case OPTION_IP_PAIR:
|
||||
dest += sprintip(dest, "", option);
|
||||
*(dest++) = '/';
|
||||
*dest++ = '/';
|
||||
option += 4;
|
||||
optlen = 4;
|
||||
case OPTION_IP: /* Works regardless of host byte order. */
|
||||
@ -132,34 +131,42 @@ static char **fill_envp(struct dhcpMessage *packet)
|
||||
int num_options = 0;
|
||||
int i, j;
|
||||
char **envp;
|
||||
char *var;
|
||||
uint8_t *temp;
|
||||
struct in_addr subnet;
|
||||
char over = 0;
|
||||
|
||||
if (packet == NULL)
|
||||
num_options = 0;
|
||||
else {
|
||||
for (i = 0; dhcp_options[i].code; i++)
|
||||
if (packet) {
|
||||
for (i = 0; dhcp_options[i].code; i++) {
|
||||
if (get_option(packet, dhcp_options[i].code)) {
|
||||
num_options++;
|
||||
if (dhcp_options[i].code == DHCP_SUBNET)
|
||||
num_options++; /* for mton */
|
||||
}
|
||||
if (packet->siaddr) num_options++;
|
||||
if ((temp = get_option(packet, DHCP_OPTION_OVER)))
|
||||
}
|
||||
if (packet->siaddr)
|
||||
num_options++;
|
||||
temp = get_option(packet, DHCP_OPTION_OVER);
|
||||
if (temp)
|
||||
over = *temp;
|
||||
if (!(over & FILE_FIELD) && packet->file[0]) num_options++;
|
||||
if (!(over & SNAME_FIELD) && packet->sname[0]) num_options++;
|
||||
if (!(over & FILE_FIELD) && packet->file[0])
|
||||
num_options++;
|
||||
if (!(over & SNAME_FIELD) && packet->sname[0])
|
||||
num_options++;
|
||||
}
|
||||
|
||||
envp = xzalloc(sizeof(char *) * (num_options + 5));
|
||||
j = 0;
|
||||
envp[j++] = xasprintf("interface=%s", client_config.interface);
|
||||
envp[j++] = xasprintf("PATH=%s",
|
||||
getenv("PATH") ? : "/bin:/usr/bin:/sbin:/usr/sbin");
|
||||
envp[j++] = xasprintf("HOME=%s", getenv("HOME") ? : "/");
|
||||
var = getenv("PATH");
|
||||
if (var)
|
||||
envp[j++] = xasprintf("PATH=%s", var);
|
||||
var = getenv("HOME");
|
||||
if (var)
|
||||
envp[j++] = xasprintf("HOME=%s", var);
|
||||
|
||||
if (packet == NULL) return envp;
|
||||
if (packet == NULL)
|
||||
return envp;
|
||||
|
||||
envp[j] = xmalloc(sizeof("ip=255.255.255.255"));
|
||||
sprintip(envp[j++], "ip=", (uint8_t *) &packet->yiaddr);
|
||||
@ -206,19 +213,20 @@ void udhcp_run_script(struct dhcpMessage *packet, const char *name)
|
||||
DEBUG("vfork'ing and execle'ing %s", client_config.script);
|
||||
|
||||
envp = fill_envp(packet);
|
||||
|
||||
/* call script */
|
||||
// can we use wait4pid(spawn(...)) here?
|
||||
pid = vfork();
|
||||
if (pid) {
|
||||
waitpid(pid, NULL, 0);
|
||||
for (curr = envp; *curr; curr++) free(*curr);
|
||||
free(envp);
|
||||
return;
|
||||
} else if (pid == 0) {
|
||||
if (pid < 0) return;
|
||||
if (pid == 0) {
|
||||
/* close fd's? */
|
||||
/* exec script */
|
||||
execle(client_config.script, client_config.script,
|
||||
name, NULL, envp);
|
||||
bb_perror_msg("script %s failed", client_config.script);
|
||||
exit(1);
|
||||
bb_perror_msg_and_die("script %s failed", client_config.script);
|
||||
}
|
||||
waitpid(pid, NULL, 0);
|
||||
for (curr = envp; *curr; curr++)
|
||||
free(*curr);
|
||||
free(envp);
|
||||
}
|
||||
|
@ -38,7 +38,7 @@ static int send_packet_to_relay(struct dhcpMessage *payload)
|
||||
/* send a packet to a specific arp address and ip address by creating our own ip packet */
|
||||
static int send_packet_to_client(struct dhcpMessage *payload, int force_broadcast)
|
||||
{
|
||||
uint8_t *chaddr;
|
||||
const uint8_t *chaddr;
|
||||
uint32_t ciaddr;
|
||||
|
||||
if (force_broadcast) {
|
||||
|
Loading…
Reference in New Issue
Block a user