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udhcpc: add -o "do not request options by default" switch

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(by L. Gabriel Somlo <somlo AT cmu.edu>)

function                                             old     new   delta
udhcpc_main                                         2513    2554     +41
static.udhcpc_longopts                               226     247     +21
add_param_req_option                                 119     132     +13
packed_usage                                       23952   23964     +12
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/0 up/down: 87/0)               Total: 87 bytes
This commit is contained in:
Denis Vlasenko 2008-04-02 13:04:19 +00:00
parent 0edbdd8ac8
commit 2e4c3c4cc3
6 changed files with 30 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
include/usage.h
View File

@ -4116,7 +4116,7 @@
"Adjust filesystem options on ext[23] filesystems"
#define udhcpc_trivial_usage \
"[-Cfbnqtv] [-c CID] [-V VCLS] [-H HOSTNAME] [-i INTERFACE]\n" \
"[-Cfbnqtvo] [-c CID] [-V VCLS] [-H HOSTNAME] [-i INTERFACE]\n" \
" [-p pidfile] [-r IP] [-s script] [-O dhcp-option]..." USE_FEATURE_UDHCP_PORT(" [-P N]")
#define udhcpc_full_usage \
USE_GETOPT_LONG( \
@ -4127,17 +4127,18 @@
"\n -C,--clientid-none Suppress default client identifier" \
"\n -p,--pidfile=file Create pidfile" \
"\n -r,--request=IP IP address to request" \
"\n -s,--script=file Run file at dhcp events (default /usr/share/udhcpc/default.script)" \
"\n -s,--script=file Run file at DHCP events (default "CONFIG_DHCPC_DEFAULT_SCRIPT")" \
"\n -t,--retries=N Send up to N request packets" \
"\n -T,--timeout=N Try to get a lease for N seconds (default 3)" \
"\n -A,--tryagain=N Wait N seconds (default 20) after failure" \
"\n -O,--request-option=OPT Request DHCP option OPT (cumulative)" \
"\n -o,--no-default-options Do not request any options (unless -O is also given)" \
"\n -f,--foreground Run in foreground" \
"\n -b,--background Background if lease is not immediately obtained" \
"\n -S,--syslog Log to syslog too" \
"\n -n,--now Exit with failure if lease is not immediately obtained" \
"\n -q,--quit Quit after obtaining lease" \
"\n -R,--release Release IP on quit" \
"\n -O,--request-option=OPT Request DHCP option OPT from server" \
USE_FEATURE_UDHCP_PORT( \
"\n -P,--client-port N Use port N instead of default 68" \
) \
@ -4153,17 +4154,18 @@
"\n -C Suppress default client identifier" \
"\n -p file Create pidfile" \
"\n -r IP IP address to request" \
"\n -s file Run file at dhcp events (default /usr/share/udhcpc/default.script)" \
"\n -s file Run file at DHCP events (default "CONFIG_DHCPC_DEFAULT_SCRIPT")" \
"\n -t N Send up to N request packets" \
"\n -T N Try to get a lease for N seconds (default 3)" \
"\n -A N Wait N seconds (default 20) after failure" \
"\n -O OPT Request DHCP option OPT (cumulative)" \
"\n -o Do not request any options (unless -O is also given)" \
"\n -f Run in foreground" \
"\n -b Background if lease is not immediately obtained" \
"\n -S Log to syslog too" \
"\n -n Exit with failure if lease is not immediately obtained" \
"\n -q Quit after obtaining lease" \
"\n -R Release IP on quit" \
"\n -O OPT Request DHCP option OPT from server" \
USE_FEATURE_UDHCP_PORT( \
"\n -P N Use port N instead of default 68" \
) \

5
networking/ifupdown.c
View File

@ -476,7 +476,8 @@ static const struct dhcp_client_t ext_dhcp_clients[] = {
"pump -i %iface% -k",
},
{ "udhcpc",
"udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]][[ -t %retries%]]",
"udhcpc -R -n -p /var/run/udhcpc.%iface%.pid -i %iface%[[ -H %hostname%]][[ -c %clientid%]]"
"[[ -s %script%]][[ %udhcpc_opts%]]",
"kill `cat /var/run/udhcpc.%iface%.pid` 2>/dev/null",
},
};
@ -507,7 +508,7 @@ static int dhcp_up(struct interface_defn_t *ifd, execfn *exec)
return 0;
#endif
return execute("udhcpc -R -n -p /var/run/udhcpc.%iface%.pid "
"-i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]][[ -t %retries%]]",
"-i %iface%[[ -H %hostname%]][[ -c %clientid%]][[ -s %script%]][[ %udhcpc_opts%]]",
ifd, exec);
}
#else

15
networking/udhcp/clientpacket.c
View File

@ -62,17 +62,20 @@ static void add_param_req_option(struct dhcpMessage *packet)
int end = end_option(packet->options);
int i, len = 0;
packet->options[end + OPT_CODE] = DHCP_PARAM_REQ;
for (i = 0; (c = dhcp_options[i].code) != 0; i++) {
if ((dhcp_options[i].flags & OPTION_REQ)
if (((dhcp_options[i].flags & OPTION_REQ)
&& !client_config.no_default_options)
|| (client_config.opt_mask[c >> 3] & (1 << (c & 7)))
) {
packet->options[end + OPT_DATA + len] = c;
len++;
}
}
packet->options[end + OPT_LEN] = len;
packet->options[end + OPT_DATA + len] = DHCP_END;
if (len) {
packet->options[end + OPT_CODE] = DHCP_PARAM_REQ;
packet->options[end + OPT_LEN] = len;
packet->options[end + OPT_DATA + len] = DHCP_END;
}
}
@ -107,7 +110,9 @@ 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 */
add_simple_option(packet.options, DHCP_MAX_SIZE, htons(576));
add_param_req_option(&packet);
bb_info_msg("Sending discover...");
return udhcp_send_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,
SERVER_PORT, MAC_BCAST_ADDR, client_config.ifindex);
@ -125,8 +130,8 @@ int send_selecting(uint32_t xid, uint32_t server, uint32_t requested)
add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
add_simple_option(packet.options, DHCP_SERVER_ID, server);
add_param_req_option(&packet);
addr.s_addr = requested;
bb_info_msg("Sending select for %s...", inet_ntoa(addr));
return udhcp_send_raw_packet(&packet, INADDR_ANY, CLIENT_PORT, INADDR_BROADCAST,

6
networking/udhcp/dhcpc.c
View File

@ -182,6 +182,7 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv)
OPT_W = 1 << 21,
#endif
OPT_P = 1 << 22,
OPT_o = 1 << 23,
};
#if ENABLE_GETOPT_LONG
static const char udhcpc_longopts[] ALIGN1 =
@ -211,6 +212,7 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv)
#if ENABLE_FEATURE_UDHCP_PORT
"client-port\0" Required_argument "P"
#endif
"no-default-options\0" No_argument "o"
;
#endif
/* Default options. */
@ -230,7 +232,7 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv)
opt = getopt32(argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:vSA:"
USE_FEATURE_UDHCPC_ARPING("aW:")
USE_FEATURE_UDHCP_PORT("P:")
"O:"
"O:o"
, &str_c, &str_V, &str_h, &str_h, &str_F
, &client_config.interface, &client_config.pidfile, &str_r
, &client_config.script
@ -291,6 +293,8 @@ int udhcpc_main(int argc ATTRIBUTE_UNUSED, char **argv)
SERVER_PORT = CLIENT_PORT - 1;
}
#endif
if (opt & OPT_o)
client_config.no_default_options = 1;
while (list_O) {
int n = index_in_strings(dhcp_option_strings, list_O->data);
if (n < 0)

1
networking/udhcp/dhcpc.h
View File

@ -21,6 +21,7 @@ struct client_config_t {
char release_on_quit; /* Perform release on quit */
char abort_if_no_lease; /* Abort if no lease */
char background_if_no_lease; /* Fork to background if no lease */
char no_default_options; /* Do not include default optins in request */
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 */

6
networking/udhcp/files.c
View File

@ -396,6 +396,7 @@ void write_leases(void)
close(fp);
if (server_config.notify_file) {
// TODO: vfork-based child creation
char *cmd = xasprintf("%s %s", server_config.notify_file, server_config.lease_file);
system(cmd);
free(cmd);
@ -406,7 +407,7 @@ void write_leases(void)
void read_leases(const char *file)
{
int fp;
unsigned int i = 0;
unsigned i;
struct dhcpOfferedAddr lease;
fp = open_or_warn(file, O_RDONLY);
@ -414,6 +415,7 @@ void read_leases(const char *file)
return;
}
i = 0;
while (i < server_config.max_leases
&& full_read(fp, &lease, sizeof(lease)) == sizeof(lease)
) {
@ -422,7 +424,7 @@ void read_leases(const char *file)
if (y >= server_config.start_ip && y <= server_config.end_ip) {
lease.expires = ntohl(lease.expires);
if (!server_config.remaining)
lease.expires -= time(0);
lease.expires -= time(NULL);
if (!(add_lease(lease.chaddr, lease.yiaddr, lease.expires))) {
bb_error_msg("too many leases while loading %s", file);
break;