diff options
Diffstat (limited to 'networking/udhcp/dhcpc.c')
| -rw-r--r-- | networking/udhcp/dhcpc.c | 65 |
1 files changed, 53 insertions, 12 deletions
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c index c6f9fe4..b3b8945 100644 --- a/networking/udhcp/dhcpc.c +++ b/networking/udhcp/dhcpc.c @@ -145,6 +145,13 @@ int udhcpc_main(int argc, char **argv) { uint8_t *temp, *message; char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_A, *str_t; + int tryagain_timeout = 60; + int discover_timeout = 3; + int discover_retries = 3; +#if ENABLE_FEATURE_UDHCPC_ARPING + int decline_wait = 10; + char *str_W; +#endif uint32_t xid = 0; uint32_t lease = 0; /* can be given as 32-bit quantity */ unsigned t1 = 0, t2 = 0; /* what a wonderful names */ @@ -180,6 +187,10 @@ int udhcpc_main(int argc, char **argv) OPT_v = 1 << 17, OPT_S = 1 << 18, OPT_A = 1 << 19, +#if ENABLE_FEATURE_UDHCPC_ARPING + OPT_a = 1 << 20, + OPT_W = 1 << 21, +#endif }; #if ENABLE_GETOPT_LONG static const char udhcpc_longopts[] ALIGN1 = @@ -203,14 +214,15 @@ int udhcpc_main(int argc, char **argv) "retries\0" Required_argument "t" "tryagain\0" Required_argument "A" "syslog\0" No_argument "S" +#if ENABLE_FEATURE_UDHCPC_ARPING + "arping\0" No_argument "a" + "wait\0" Required_argument "W" +#endif ; #endif /* Default options. */ client_config.interface = "eth0"; client_config.script = DEFAULT_SCRIPT; - client_config.retries = 3; - client_config.timeout = 3; - client_config.tryagain = 60; /* Parse command line */ opt_complementary = "c--C:C--c" // mutually exclusive @@ -218,10 +230,12 @@ int udhcpc_main(int argc, char **argv) #if ENABLE_GETOPT_LONG applet_long_options = udhcpc_longopts; #endif - opt = getopt32(argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:vSA:", - &str_c, &str_V, &str_h, &str_h, &str_F, + opt = getopt32(argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:vSA:" + USE_FEATURE_UDHCPC_ARPING("aW:") + , &str_c, &str_V, &str_h, &str_h, &str_F, &client_config.interface, &client_config.pidfile, &str_r, &client_config.script, &str_T, &str_t, &str_A + USE_FEATURE_UDHCPC_ARPING(, &str_W) ); if (opt & OPT_c) @@ -259,11 +273,11 @@ int udhcpc_main(int argc, char **argv) requested_ip = inet_addr(str_r); // if (opt & OPT_s) client_config.script = ... if (opt & OPT_T) - client_config.timeout = xatoi_u(str_T); + discover_timeout = xatoi_u(str_T); if (opt & OPT_t) - client_config.retries = xatoi_u(str_t); + discover_retries = xatoi_u(str_t); if (opt & OPT_A) - client_config.tryagain = xatoi_u(str_A); + tryagain_timeout = xatoi_u(str_A); if (opt & OPT_v) { puts("version "BB_VER); return 0; @@ -274,6 +288,11 @@ int udhcpc_main(int argc, char **argv) logmode |= LOGMODE_SYSLOG; } +#if ENABLE_FEATURE_UDHCPC_ARPING + if (opt & OPT_W) + decline_wait = xatou_range(str_W, 10, INT_MAX); +#endif + if (read_interface(client_config.interface, &client_config.ifindex, NULL, client_config.arp)) return 1; @@ -339,14 +358,14 @@ int udhcpc_main(int argc, char **argv) /* timeout dropped to zero */ switch (state) { case INIT_SELECTING: - if (packet_num < client_config.retries) { + if (packet_num < discover_retries) { if (packet_num == 0) xid = random_xid(); /* send discover packet */ send_discover(xid, requested_ip); /* broadcast */ - timeout = now + client_config.timeout; + timeout = now + discover_timeout; packet_num++; } else { udhcp_run_script(NULL, "leasefail"); @@ -360,12 +379,12 @@ int udhcpc_main(int argc, char **argv) } /* wait to try again */ packet_num = 0; - timeout = now + client_config.tryagain; + timeout = now + tryagain_timeout; } break; case RENEW_REQUESTED: case REQUESTING: - if (packet_num < client_config.retries) { + if (packet_num < discover_retries) { /* send request packet */ if (state == RENEW_REQUESTED) send_renew(xid, server_addr, requested_ip); /* unicast */ @@ -491,6 +510,28 @@ int udhcpc_main(int argc, char **argv) lease = ntohl(lease); } +#if ENABLE_FEATURE_UDHCPC_ARPING + if (opt & OPT_a) { + if (!arpping(packet.yiaddr, + (uint32_t) 0, + client_config.arp, + client_config.interface) + ) { + bb_info_msg("offered address is in use," + " declining"); + send_decline(xid, server_addr); + + if (state != REQUESTING) + udhcp_run_script(NULL, "deconfig"); + state = INIT_SELECTING; + requested_ip = 0; + packet_num = 0; + change_mode(LISTEN_RAW); + timeout = now + decline_wait; + break; + } + } +#endif /* enter bound state */ t1 = lease / 2; |