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authorDenys Vlasenko <vda.linux@googlemail.com>2010-03-25 19:32:38 (GMT)
committer Denys Vlasenko <vda.linux@googlemail.com>2010-03-25 19:32:38 (GMT)
commit7e6add1dfca95183bf409820066fab975979bf06 (patch)
tree0da56954d93e9b10e956235a32f0d0644a60063b
parent0454d9d6c314f381eee8022ad4e7447d2fa1dcf1 (diff)
downloadbusybox-7e6add1dfca95183bf409820066fab975979bf06.tar.gz
busybox-7e6add1dfca95183bf409820066fab975979bf06.tar.bz2
udhcpc: add -x OPT:VAL option
function old new delta udhcp_str2optset - 443 +443 add_client_options - 160 +160 udhcpc_main 2753 2857 +104 packed_usage 26670 26689 +19 attach_option 380 385 +5 udhcpd_main 1964 1965 +1 udhcp_add_option_string 94 86 -8 add_param_req_option 128 - -128 read_opt 443 - -443 ------------------------------------------------------------------------------ (add/remove: 2/2 grow/shrink: 4/1 up/down: 732/-579) Total: 153 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
-rw-r--r--include/usage.h2
-rw-r--r--networking/udhcp/common.h8
-rw-r--r--networking/udhcp/dhcpc.c53
-rw-r--r--networking/udhcp/dhcpc.h1
-rw-r--r--networking/udhcp/dhcpd.h5
-rw-r--r--networking/udhcp/files.c6
-rw-r--r--networking/udhcp/options.c10
7 files changed, 61 insertions, 24 deletions
diff --git a/include/usage.h b/include/usage.h
index 40cb6b2..a343b41 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -4821,6 +4821,7 @@
"\n -t,--retries N Send up to N discover packets" \
"\n -T,--timeout N Pause between packets (default 3 seconds)" \
"\n -A,--tryagain N Wait N seconds (default 20) after failure" \
+ "\n -x OPT:VAL Include option OPT in sent packets (cumulative)" \
"\n -O,--request-option OPT Request DHCP option OPT (cumulative)" \
"\n -o,--no-default-options Don't request any options (unless -O is given)" \
"\n -f,--foreground Run in foreground" \
@@ -4851,6 +4852,7 @@
"\n -t N Send up to N discover packets" \
"\n -T N Pause between packets (default 3 seconds)" \
"\n -A N Wait N seconds (default 20) after failure" \
+ "\n -x OPT:VAL Include option OPT in sent packets" \
"\n -O OPT Request DHCP option OPT (cumulative)" \
"\n -o Don't request any options (unless -O is given)" \
"\n -f Run in foreground" \
diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h
index 15fe785..9c3b496 100644
--- a/networking/udhcp/common.h
+++ b/networking/udhcp/common.h
@@ -161,6 +161,11 @@ struct dhcp_option {
uint8_t code;
};
+struct option_set {
+ uint8_t *data;
+ struct option_set *next;
+};
+
extern const struct dhcp_option dhcp_options[];
extern const char dhcp_option_strings[];
extern const uint8_t dhcp_option_lengths[];
@@ -173,6 +178,9 @@ void udhcp_add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) FA
char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC;
uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC;
#endif
+/* 2nd param is actually "struct option_set**" */
+int FAST_FUNC udhcp_str2optset(const char *const_line, void *arg);
+
// RFC 2131 Table 5: Fields and options used by DHCP clients
//
diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c
index 7587509..4565d7f 100644
--- a/networking/udhcp/dhcpc.c
+++ b/networking/udhcp/dhcpc.c
@@ -331,11 +331,11 @@ static void init_packet(struct dhcp_packet *packet, char type)
}
}
-/* Add a parameter request list for stubborn DHCP servers. Pull the data
- * from the struct in options.c. Don't do bounds checking here because it
- * goes towards the head of the packet. */
-static void add_param_req_option(struct dhcp_packet *packet)
+static void add_client_options(struct dhcp_packet *packet)
{
+ /* Add am "param req" option with the list of options we'd like to have
+ * from stubborn DHCP servers. Pull the data from the struct in options.c.
+ * No bounds checking because it goes towards the head of the packet. */
uint8_t c;
int end = udhcp_end_option(packet->options);
int i, len = 0;
@@ -355,6 +355,19 @@ static void add_param_req_option(struct dhcp_packet *packet)
packet->options[end + OPT_LEN] = len;
packet->options[end + OPT_DATA + len] = DHCP_END;
}
+
+ /* Add -x options if any */
+ {
+ struct option_set *curr = client_config.options;
+ while (curr) {
+ udhcp_add_option_string(packet->options, curr->data);
+ curr = curr->next;
+ }
+// if (client_config.sname)
+// strncpy((char*)packet->sname, client_config.sname, sizeof(packet->sname) - 1);
+// if (client_config.boot_file)
+// strncpy((char*)packet->file, client_config.boot_file, sizeof(packet->file) - 1);
+ }
}
/* RFC 2131
@@ -395,7 +408,7 @@ static int send_discover(uint32_t xid, uint32_t requested)
/* Explicitly saying that we want RFC-compliant packets helps
* some buggy DHCP servers to NOT send bigger packets */
udhcp_add_simple_option(packet.options, DHCP_MAX_SIZE, htons(576));
- add_param_req_option(&packet);
+ add_client_options(&packet);
bb_info_msg("Sending discover...");
return raw_bcast_from_client_config_ifindex(&packet);
@@ -414,7 +427,7 @@ static int send_select(uint32_t xid, uint32_t server, uint32_t requested)
packet.xid = xid;
udhcp_add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
udhcp_add_simple_option(packet.options, DHCP_SERVER_ID, server);
- add_param_req_option(&packet);
+ add_client_options(&packet);
addr.s_addr = requested;
bb_info_msg("Sending select for %s...", inet_ntoa(addr));
@@ -429,7 +442,7 @@ static int send_renew(uint32_t xid, uint32_t server, uint32_t ciaddr)
init_packet(&packet, DHCPREQUEST);
packet.xid = xid;
packet.ciaddr = ciaddr;
- add_param_req_option(&packet);
+ add_client_options(&packet);
bb_info_msg("Sending renew...");
if (server)
@@ -728,6 +741,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
const char *str_c, *str_V, *str_h, *str_F, *str_r;
IF_FEATURE_UDHCP_PORT(char *str_P;)
llist_t *list_O = NULL;
+ llist_t *list_x = NULL;
int tryagain_timeout = 20;
int discover_timeout = 3;
int discover_retries = 3;
@@ -792,9 +806,10 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
OPT_A = 1 << 16,
OPT_O = 1 << 17,
OPT_o = 1 << 18,
- OPT_f = 1 << 19,
+ OPT_x = 1 << 19,
+ OPT_f = 1 << 20,
/* The rest has variable bit positions, need to be clever */
- OPTBIT_f = 19,
+ OPTBIT_f = 20,
USE_FOR_MMU( OPTBIT_b,)
IF_FEATURE_UDHCPC_ARPING(OPTBIT_a,)
IF_FEATURE_UDHCP_PORT( OPTBIT_P,)
@@ -811,14 +826,14 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
str_V = "udhcp "BB_VER;
/* Parse command line */
- /* Cc: mutually exclusive; O: list; -T,-t,-A take numeric param */
- opt_complementary = "c--C:C--c:O::T+:t+:A+"
+ /* Cc: mutually exclusive; O,x: list; -T,-t,-A take numeric param */
+ opt_complementary = "c--C:C--c:O::x::T+:t+:A+"
#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
":vv"
#endif
;
IF_LONG_OPTS(applet_long_options = udhcpc_longopts;)
- opt = getopt32(argv, "c:CV:H:h:F:i:np:qRr:s:T:t:SA:O:of"
+ opt = getopt32(argv, "c:CV:H:h:F:i:np:qRr:s:T:t:SA:O:ox:f"
USE_FOR_MMU("b")
IF_FEATURE_UDHCPC_ARPING("a")
IF_FEATURE_UDHCP_PORT("P:")
@@ -828,6 +843,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
, &client_config.script /* s */
, &discover_timeout, &discover_retries, &tryagain_timeout /* T,t,A */
, &list_O
+ , &list_x
IF_FEATURE_UDHCP_PORT(, &str_P)
#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
, &dhcp_verbose
@@ -868,6 +884,19 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv)
n = dhcp_options[n].code;
client_config.opt_mask[n >> 3] |= 1 << (n & 7);
}
+ while (list_x) {
+ int n;
+ char *optstr = llist_pop(&list_x);
+ char *colon = strchr(optstr, ':');
+ if (colon)
+ *colon = '\0';
+ n = index_in_strings(dhcp_option_strings, optstr);
+ if (n < 0)
+ bb_error_msg_and_die("unknown option '%s'", optstr);
+ if (colon)
+ *colon = ' ';
+ udhcp_str2optset(optstr, &client_config.options);
+ }
if (udhcp_read_interface(client_config.interface,
&client_config.ifindex,
diff --git a/networking/udhcp/dhcpc.h b/networking/udhcp/dhcpc.h
index 4c17353..fba747f 100644
--- a/networking/udhcp/dhcpc.h
+++ b/networking/udhcp/dhcpc.h
@@ -13,6 +13,7 @@ struct client_config_t {
const char *interface; /* The name of the interface to use */
char *pidfile; /* Optionally store the process ID */
const char *script; /* User script to run at dhcp events */
+ struct option_set *options; /* list of DHCP options to send to server */
uint8_t *clientid; /* Optional client id to use */
uint8_t *vendorclass; /* Optional vendor class-id to use */
uint8_t *hostname; /* Optional hostname to use */
diff --git a/networking/udhcp/dhcpd.h b/networking/udhcp/dhcpd.h
index b163ce7..a4e9a58 100644
--- a/networking/udhcp/dhcpd.h
+++ b/networking/udhcp/dhcpd.h
@@ -13,11 +13,6 @@ PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
#define DHCPD_CONF_FILE "/etc/udhcpd.conf"
-struct option_set {
- uint8_t *data;
- struct option_set *next;
-};
-
struct static_lease {
struct static_lease *next;
uint32_t nip;
diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c
index 05a7b99..fddda4c 100644
--- a/networking/udhcp/files.c
+++ b/networking/udhcp/files.c
@@ -145,7 +145,7 @@ static NOINLINE void attach_option(
}
/* read a dhcp option and add it to opt_list */
-static int FAST_FUNC read_opt(const char *const_line, void *arg)
+int FAST_FUNC udhcp_str2optset(const char *const_line, void *arg)
{
struct option_set **opt_list = arg;
char *opt, *val, *endptr;
@@ -292,8 +292,8 @@ static const struct config_keyword keywords[] = {
{"pidfile", read_str, &(server_config.pidfile), "/var/run/udhcpd.pid"},
{"siaddr", read_nip, &(server_config.siaddr_nip), "0.0.0.0"},
/* keywords with no defaults must be last! */
- {"option", read_opt, &(server_config.options), ""},
- {"opt", read_opt, &(server_config.options), ""},
+ {"option", udhcp_str2optset, &(server_config.options), ""},
+ {"opt", udhcp_str2optset, &(server_config.options), ""},
{"notify_file", read_str, &(server_config.notify_file), ""},
{"sname", read_str, &(server_config.sname), ""},
{"boot_file", read_str, &(server_config.boot_file), ""},
diff --git a/networking/udhcp/options.c b/networking/udhcp/options.c
index b4d2d2d..af3c217 100644
--- a/networking/udhcp/options.c
+++ b/networking/udhcp/options.c
@@ -212,7 +212,7 @@ int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
while (optionptr[i] != DHCP_END) {
if (optionptr[i] != DHCP_PADDING)
- i += optionptr[i + OPT_LEN] + 1;
+ i += optionptr[i + OPT_LEN] + OPT_DATA-1;
i++;
}
return i;
@@ -222,7 +222,8 @@ int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
/* option bytes: [code][len][data1][data2]..[dataLEN] */
void FAST_FUNC udhcp_add_option_string(uint8_t *optionptr, uint8_t *string)
{
- int end = udhcp_end_option(optionptr);
+ unsigned len;
+ unsigned end = udhcp_end_option(optionptr);
/* end position + string length + option code/length + end option */
if (end + string[OPT_LEN] + 2 + 1 >= DHCP_OPTIONS_BUFSIZE) {
@@ -231,8 +232,9 @@ void FAST_FUNC udhcp_add_option_string(uint8_t *optionptr, uint8_t *string)
return;
}
log_option("Adding option", string);
- memcpy(optionptr + end, string, string[OPT_LEN] + 2);
- optionptr[end + string[OPT_LEN] + 2] = DHCP_END;
+ len = OPT_DATA + string[OPT_LEN];
+ memcpy(optionptr + end, string, len);
+ optionptr[end + len] = DHCP_END;
}
/* add a one to four byte option to a packet */