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udhcp: optional support for non-standard DHCP ports (+300 bytes when selected)
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@ -3892,7 +3892,7 @@ USE_FEATURE_RUN_PARTS_FANCY("\n -l Prints names of all matching files even when
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#define udhcpc_trivial_usage \
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"[-Cfbnqtv] [-c CID] [-V VCLS] [-H HOSTNAME] [-i INTERFACE]\n" \
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" [-p pidfile] [-r IP] [-s script] [-O dhcp-option]..."
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" [-p pidfile] [-r IP] [-s script] [-O dhcp-option]..." USE_FEATURE_UDHCP_PORT(" [-P N]")
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#define udhcpc_full_usage \
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USE_GETOPT_LONG( \
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" -V,--vendorclass=CLASSID Vendor class identifier" \
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@ -3913,6 +3913,9 @@ USE_FEATURE_RUN_PARTS_FANCY("\n -l Prints names of all matching files even when
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"\n -q,--quit Quit after obtaining lease" \
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"\n -R,--release Release IP on quit" \
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"\n -O,--request-option=OPT Request DHCP option OPT from server" \
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USE_FEATURE_UDHCP_PORT( \
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"\n -P,--client-port N Use port N instead of default 68" \
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) \
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USE_FEATURE_UDHCPC_ARPING( \
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"\n -a,--arping Use arping to validate offered address" \
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) \
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@ -3936,18 +3939,24 @@ USE_FEATURE_RUN_PARTS_FANCY("\n -l Prints names of all matching files even when
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"\n -q Quit after obtaining lease" \
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"\n -R Release IP on quit" \
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"\n -O OPT Request DHCP option OPT from server" \
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USE_FEATURE_UDHCP_PORT( \
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"\n -P N Use port N instead of default 68" \
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) \
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USE_FEATURE_UDHCPC_ARPING( \
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"\n -a Use arping to validate offered address" \
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) \
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)
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#define udhcpd_trivial_usage \
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"[-fS] [configfile]" \
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"[-fS]" USE_FEATURE_UDHCP_PORT(" [-P N]") " [configfile]" \
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#define udhcpd_full_usage \
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"DHCP server" \
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"\n -f Run in foreground" \
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"\n -S Log to syslog too"
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"\n -S Log to syslog too" \
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USE_FEATURE_UDHCP_PORT( \
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"\n -P N Use port N instead of default 67" \
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)
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#define umount_trivial_usage \
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"[flags] FILESYSTEM|DIRECTORY"
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@ -63,6 +63,13 @@ config FEATURE_UDHCPC_ARPING
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is really available. The client will DHCPDECLINE the offer if the
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address is in use, and restart the discover process.
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config FEATURE_UDHCP_PORT
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bool "Enable '-P port' option for udhcpd and udhcpc"
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default n
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depends on APP_UDHCPD || APP_UDHCPC
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help
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At the cost of ~300 bytes, enables -P port option.
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This feature is typically not needed.
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config FEATURE_UDHCP_DEBUG
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bool "Compile udhcp with noisy debugging messages"
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@ -33,8 +33,8 @@
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#include <linux/filter.h>
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#include "common.h"
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#define SERVER_AND_CLIENT_PORTS ((SERVER_PORT << 16) + CLIENT_PORT)
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#include "dhcpd.h"
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#include "dhcpc.h"
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int raw_socket(int ifindex)
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{
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@ -62,6 +62,7 @@ int raw_socket(int ifindex)
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*
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* TODO: make conditional?
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*/
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#define SERVER_AND_CLIENT_PORTS ((67 << 16) + 68)
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static const struct sock_filter filter_instr[] = {
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/* check for udp */
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BPF_STMT(BPF_LD|BPF_B|BPF_ABS, 9),
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@ -89,10 +90,13 @@ int raw_socket(int ifindex)
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fd = xsocket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
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DEBUG("got raw socket fd %d", fd);
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/* Ignoring error (kernel may lack support for this) */
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if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter_prog,
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if (SERVER_PORT == 67 && CLIENT_PORT == 68) {
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/* Use only if standard ports are in use */
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/* Ignoring error (kernel may lack support for this) */
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if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter_prog,
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sizeof(filter_prog)) >= 0)
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DEBUG("attached filter to raw socket fd %d", fd);
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DEBUG("attached filter to raw socket fd %d", fd);
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}
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sock.sll_family = AF_PACKET;
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sock.sll_protocol = htons(ETH_P_IP);
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@ -14,9 +14,6 @@
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#define DEFAULT_SCRIPT "/usr/share/udhcpc/default.script"
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#define SERVER_PORT 67
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#define CLIENT_PORT 68
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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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@ -133,6 +133,7 @@ int udhcpc_main(int argc, char **argv)
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{
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uint8_t *temp, *message;
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char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_A, *str_t;
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USE_FEATURE_UDHCP_PORT(char *str_P;)
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llist_t *list_O = NULL;
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#if ENABLE_FEATURE_UDHCPC_ARPING
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char *str_W;
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@ -181,6 +182,7 @@ int udhcpc_main(int argc, char **argv)
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OPT_a = 1 << 20,
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OPT_W = 1 << 21,
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#endif
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OPT_P = 1 << 22,
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};
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#if ENABLE_GETOPT_LONG
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static const char udhcpc_longopts[] ALIGN1 =
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@ -207,9 +209,16 @@ int udhcpc_main(int argc, char **argv)
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"arping\0" No_argument "a"
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#endif
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"request-option\0" Required_argument "O"
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#if ENABLE_FEATURE_UDHCP_PORT
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"client-port\0" Required_argument "P"
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#endif
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;
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#endif
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/* Default options. */
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#if ENABLE_FEATURE_UDHCP_PORT
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SERVER_PORT = 67;
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CLIENT_PORT = 68;
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#endif
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client_config.interface = "eth0";
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client_config.script = DEFAULT_SCRIPT;
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@ -220,11 +229,13 @@ int udhcpc_main(int argc, char **argv)
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#endif
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opt = getopt32(argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:vSA:"
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USE_FEATURE_UDHCPC_ARPING("aW:")
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USE_FEATURE_UDHCP_PORT("P:")
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"O:"
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, &str_c, &str_V, &str_h, &str_h, &str_F
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, &client_config.interface, &client_config.pidfile, &str_r
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, &client_config.script, &str_T, &str_t, &str_A
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USE_FEATURE_UDHCPC_ARPING(, &str_W)
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USE_FEATURE_UDHCP_PORT(, &str_P)
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, &list_O
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);
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@ -276,6 +287,12 @@ int udhcpc_main(int argc, char **argv)
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openlog(applet_name, LOG_PID, LOG_LOCAL0);
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logmode |= LOGMODE_SYSLOG;
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}
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#if ENABLE_FEATURE_UDHCP_PORT
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if (opt & OPT_P) {
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CLIENT_PORT = xatou16(str_P);
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SERVER_PORT = CLIENT_PORT - 1;
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}
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#endif
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while (list_O) {
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int n = index_in_strings(dhcp_option_strings, list_O->data);
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if (n < 0)
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@ -29,11 +29,19 @@ struct client_config_t {
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uint8_t *hostname; /* Optional hostname to use */
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uint8_t *fqdn; /* Optional fully qualified domain name to use */
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int ifindex; /* Index number of the interface to use */
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uint16_t port;
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uint8_t arp[6]; /* Our arp address */
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uint8_t opt_mask[256 / 8]; /* Bitmask of options to send (-O option) */
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};
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#define client_config (*(struct client_config_t*)&bb_common_bufsiz1)
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/* server_config sits in 1st half of bb_common_bufsiz1 */
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#define client_config (*(struct client_config_t*)(&bb_common_bufsiz1[COMMON_BUFSIZE/2]))
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#if ENABLE_FEATURE_UDHCP_PORT
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#define CLIENT_PORT (client_config.port)
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#else
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#define CLIENT_PORT 68
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#endif
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/*** clientpacket.h ***/
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@ -12,6 +12,7 @@
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#include <syslog.h>
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#include "common.h"
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#include "dhcpc.h"
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#include "dhcpd.h"
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#include "options.h"
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@ -35,8 +36,14 @@ int udhcpd_main(int argc, char **argv)
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unsigned opt;
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struct option_set *option;
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struct dhcpOfferedAddr *lease, static_lease;
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USE_FEATURE_UDHCP_PORT(char *str_P;)
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opt = getopt32(argv, "fS");
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#if ENABLE_FEATURE_UDHCP_PORT
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SERVER_PORT = 67;
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CLIENT_PORT = 68;
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#endif
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opt = getopt32(argv, "fS" USE_FEATURE_UDHCP_PORT("P:", &str_P));
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argv += optind;
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if (!(opt & 1)) { /* no -f */
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@ -48,7 +55,12 @@ int udhcpd_main(int argc, char **argv)
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openlog(applet_name, LOG_PID, LOG_LOCAL0);
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logmode |= LOGMODE_SYSLOG;
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}
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#if ENABLE_FEATURE_UDHCP_PORT
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if (opt & 4) { /* -P */
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SERVER_PORT = xatou16(str_P);
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CLIENT_PORT = SERVER_PORT + 1;
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}
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#endif
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/* Would rather not do read_config before daemonization -
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* otherwise NOMMU machines will parse config twice */
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read_config(argv[0] ? argv[0] : DHCPD_CONF_FILE);
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/* vi: set sw=4 ts=4: */
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/* dhcpd.h */
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#ifndef _DHCPD_H
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#define _DHCPD_H
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@ -27,6 +28,7 @@ struct static_lease {
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struct server_config_t {
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uint32_t server; /* Our IP, in network order */
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uint16_t port;
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/* start,end are in host order: we need to compare start <= ip <= end */
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uint32_t start_ip; /* Start address of leases, in host order */
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uint32_t end_ip; /* End of leases, in host order */
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@ -55,6 +57,13 @@ struct server_config_t {
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};
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#define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
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/* client_config sits in 2nd half of bb_common_bufsiz1 */
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#if ENABLE_FEATURE_UDHCP_PORT
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#define SERVER_PORT (server_config.port)
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#else
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#define SERVER_PORT 67
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#endif
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extern struct dhcpOfferedAddr *leases;
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#include "options.h"
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/* constants */
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#define SERVER_PORT 67
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#define SELECT_TIMEOUT 5 /* select timeout in sec. */
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#define MAX_LIFETIME 2*60 /* lifetime of an xid entry in sec. */
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*/
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#include "common.h"
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#include "dhcpc.h"
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#include "dhcpd.h"
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#include "options.h"
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