From 3a86bcb58a7c081df22b6f55e973d5e3c99065d8 Mon Sep 17 00:00:00 2001
From: Pavel Zhukov <pzhukov@redhat.com>
Date: Thu, 21 Feb 2019 10:19:47 +0100
Subject: [PATCH 02/21] additional dhclient options
Cc: pzhukov@redhat.com
---
client/clparse.c | 10 +-
client/dhclient.8 | 27 ++++++
client/dhclient.c | 271 +++++++++++++++++++++++++++++++++++++++++++++++++++-
common/conflex.c | 2 +
includes/dhcpd.h | 3 +
includes/dhctoken.h | 1 +
6 files changed, 308 insertions(+), 6 deletions(-)
diff --git a/client/clparse.c b/client/clparse.c
index eaf48a8..7212e3a 100644
--- a/client/clparse.c
+++ b/client/clparse.c
@@ -189,6 +189,7 @@ isc_result_t read_client_conf ()
/* Requested lease time, used by DHCPv6 (DHCPv4 uses the option cache)
*/
top_level_config.requested_lease = 7200;
+ top_level_config.bootp_broadcast_always = 0;
group_allocate (&top_level_config.on_receipt, MDL);
if (!top_level_config.on_receipt)
@@ -394,7 +395,8 @@ void read_client_leases ()
interface-declaration |
LEASE client-lease-statement |
ALIAS client-lease-statement |
- KEY key-definition */
+ KEY key-definition |
+ BOOTP_BROADCAST_ALWAYS */
void parse_client_statement (cfile, ip, config)
struct parse *cfile;
@@ -817,6 +819,12 @@ void parse_client_statement (cfile, ip, config)
parse_lease_id_format(cfile);
break;
+ case BOOTP_BROADCAST_ALWAYS:
+ token = next_token(&val, (unsigned*)0, cfile);
+ config -> bootp_broadcast_always = 1;
+ parse_semi (cfile);
+ return;
+
default:
lose = 0;
diff --git a/client/dhclient.8 b/client/dhclient.8
index ebc750f..6d7fbdb 100644
--- a/client/dhclient.8
+++ b/client/dhclient.8
@@ -134,6 +134,33 @@ dhclient - Dynamic Host Configuration Protocol Client
.B -w
]
[
+.B -B
+]
+[
+.B -C
+.I dhcp-client-identifier
+]
+[
+.B -H
+.I host-name
+]
+[
+.B -F
+.I fqdn.fqdn
+]
+[
+.B -V
+.I vendor-class-identifier
+]
+[
+.B --request-options
+.I request-option-list
+]
+[
+.B --timeout
+.I timeout
+]
+[
.B --dad-wait-time
.I seconds
]
diff --git a/client/dhclient.c b/client/dhclient.c
index 825ab00..26a333c 100644
--- a/client/dhclient.c
+++ b/client/dhclient.c
@@ -41,6 +41,12 @@
#include <sys/wait.h>
#include <limits.h>
+/*
+ * Defined in stdio.h when _GNU_SOURCE is set, but we don't want to define
+ * that when building ISC code.
+ */
+extern int asprintf(char **strp, const char *fmt, ...);
+
TIME default_lease_time = 43200; /* 12 hours... */
TIME max_lease_time = 86400; /* 24 hours... */
@@ -110,6 +116,10 @@ char *mockup_relay = NULL;
char *progname = NULL;
+int bootp_broadcast_always = 0;
+
+extern struct option *default_requested_options[];
+
void run_stateless(int exit_mode, u_int16_t port);
static isc_result_t write_duid(struct data_string *duid);
@@ -183,8 +193,12 @@ static const char use_v6command[] = "Command not used for DHCPv4: %s";
" [-s server-addr] [-cf config-file]\n" \
" [-df duid-file] [-lf lease-file]\n" \
" [-pf pid-file] [--no-pid] [-e VAR=val]\n" \
-" [-sf script-file] [interface]*"
-
+" [-sf script-file] [interface]*\n" \
+" [-C <dhcp-client-identifier>] [-B]\n" \
+" [-H <host-name> | -F <fqdn.fqdn>] [--timeout <timeout>]\n" \
+" [-V <vendor-class-identifier>]\n" \
+" [--request-options <request option list>]"
+
#define DHCLIENT_USAGEH "{--version|--help|-h}"
static void
@@ -243,6 +257,16 @@ main(int argc, char **argv) {
#else
progname = argv[0];
#endif
+ char *dhcp_client_identifier_arg = NULL;
+ char *dhcp_host_name_arg = NULL;
+ char *dhcp_fqdn_arg = NULL;
+ char *dhcp_vendor_class_identifier_arg = NULL;
+ char *dhclient_request_options = NULL;
+
+ int timeout_arg = 0;
+ char *arg_conf = NULL;
+ int arg_conf_len = 0;
+
/* Initialize client globals. */
memset(&default_duid, 0, sizeof(default_duid));
@@ -558,6 +582,89 @@ main(int argc, char **argv) {
std_dhcid = 1;
} else if (!strcmp(argv[i], "-v")) {
quiet = 0;
+ } else if (!strcmp(argv[i], "-C")) {
+ if ((++i == argc) || (argv[i] == NULL) || (*(argv[i])=='\0')) {
+ usage(use_noarg, argv[i-1]);
+ exit(1);
+ }
+
+ if (strlen(argv[i]) >= DHCP_MAX_OPTION_LEN) {
+ log_error("-C option dhcp-client-identifier string \"%s\" is too long - maximum length is: %d", argv[i], DHCP_MAX_OPTION_LEN-1);
+ exit(1);
+ }
+
+ dhcp_client_identifier_arg = argv[i];
+ } else if (!strcmp(argv[i], "-B")) {
+ bootp_broadcast_always = 1;
+ } else if (!strcmp(argv[i], "-H")) {
+ if ((++i == argc) || (argv[i] == NULL) || (*(argv[i])=='\0')) {
+ usage(use_noarg, argv[i-1]);
+ exit(1);
+ }
+
+ if (strlen(argv[i]) >= DHCP_MAX_OPTION_LEN) {
+ log_error("-H option host-name string \"%s\" is too long - maximum length is: %d", argv[i], DHCP_MAX_OPTION_LEN-1);
+ exit(1);
+ }
+
+ if (dhcp_host_name_arg != NULL) {
+ log_error("The -H <host-name> and -F <fqdn> arguments are mutually exclusive");
+ exit(1);
+ }
+
+ dhcp_host_name_arg = argv[i];
+ } else if (!strcmp(argv[i], "-F")) {
+ if ((++i == argc) || (argv[i] == NULL) || (*(argv[i])=='\0')) {
+ usage(use_noarg, argv[i-1]);
+ exit(1);
+ }
+
+ if (strlen(argv[i]) >= DHCP_MAX_OPTION_LEN) {
+ log_error("-F option fqdn.fqdn string \"%s\" is too long - maximum length is: %d", argv[i], DHCP_MAX_OPTION_LEN-1);
+ exit(1);
+ }
+
+ if (dhcp_fqdn_arg != NULL) {
+ log_error("Only one -F <fqdn> argument can be specified");
+ exit(1);
+ }
+
+ if (dhcp_host_name_arg != NULL) {
+ log_error("The -F <fqdn> and -H <host-name> arguments are mutually exclusive");
+ exit(1);
+ }
+
+ dhcp_fqdn_arg = argv[i];
+ } else if (!strcmp(argv[i], "--timeout")) {
+ if ((++i == argc) || (argv[i] == NULL) || (*(argv[i])=='\0')) {
+ usage(use_noarg, argv[i-1]);
+ exit(1);
+ }
+
+ if ((timeout_arg = atoi(argv[i])) <= 0) {
+ log_error("timeout option must be > 0 - bad value: %s",argv[i]);
+ exit(1);
+ }
+ } else if (!strcmp(argv[i], "-V")) {
+ if ((++i == argc) || (argv[i] == NULL) || (*(argv[i])=='\0')) {
+ usage(use_noarg, argv[i-1]);
+ exit(1);
+ }
+
+ if (strlen(argv[i]) >= DHCP_MAX_OPTION_LEN) {
+ log_error("-V option vendor-class-identifier string \"%s\" is too long - maximum length is: %d", argv[i], DHCP_MAX_OPTION_LEN-1);
+ exit(1);
+ }
+
+ dhcp_vendor_class_identifier_arg = argv[i];
+ } else if (!strcmp(argv[i], "--request-options")) {
+ if ((++i == argc) || (argv[i] == NULL) || (*(argv[i])=='\0')) {
+ usage(use_noarg, argv[i-1]);
+ exit(1);
+ }
+
+ dhclient_request_options = argv[i];
+
} else if (argv[i][0] == '-') {
usage("Unknown command: %s", argv[i]);
} else if (interfaces_requested < 0) {
@@ -754,6 +861,156 @@ main(int argc, char **argv) {
/* Parse the dhclient.conf file. */
read_client_conf();
+ /* Parse any extra command line configuration arguments: */
+ if ((dhcp_client_identifier_arg != NULL) && (*dhcp_client_identifier_arg != '\0')) {
+ arg_conf_len = asprintf(&arg_conf, "send dhcp-client-identifier \"%s\";", dhcp_client_identifier_arg);
+
+ if ((arg_conf == 0) || (arg_conf_len <= 0))
+ log_fatal("Unable to send -C option dhcp-client-identifier");
+ }
+
+ if ((dhcp_host_name_arg != NULL) && (*dhcp_host_name_arg != '\0')) {
+ if (arg_conf == 0) {
+ arg_conf_len = asprintf(&arg_conf, "send host-name \"%s\";", dhcp_host_name_arg);
+
+ if ((arg_conf == 0) || (arg_conf_len <= 0))
+ log_fatal("Unable to send -H option host-name");
+ } else {
+ char *last_arg_conf = arg_conf;
+ arg_conf = NULL;
+ arg_conf_len = asprintf(&arg_conf, "%s\nsend host-name \"%s\";", last_arg_conf, dhcp_host_name_arg);
+
+ if ((arg_conf == 0) || (arg_conf_len <= 0))
+ log_fatal("Unable to send -H option host-name");
+
+ free(last_arg_conf);
+ }
+ }
+
+ if ((dhcp_fqdn_arg != NULL) && (*dhcp_fqdn_arg != '\0')) {
+ if (arg_conf == 0) {
+ arg_conf_len = asprintf(&arg_conf, "send fqdn.fqdn \"%s\";", dhcp_fqdn_arg);
+
+ if ((arg_conf == 0) || (arg_conf_len <= 0))
+ log_fatal("Unable to send -F option fqdn.fqdn");
+ } else {
+ char *last_arg_conf = arg_conf;
+ arg_conf = NULL;
+ arg_conf_len = asprintf(&arg_conf, "%s\nsend fqdn.fqdn \"%s\";", last_arg_conf, dhcp_fqdn_arg);
+
+ if ((arg_conf == 0) || (arg_conf_len <= 0))
+ log_fatal("Unable to send -F option fqdn.fqdn");
+
+ free(last_arg_conf);
+ }
+ }
+
+ if (timeout_arg) {
+ if (arg_conf == 0) {
+ arg_conf_len = asprintf(&arg_conf, "timeout %d;", timeout_arg);
+
+ if ((arg_conf == 0) || (arg_conf_len <= 0))
+ log_fatal("Unable to process --timeout timeout argument");
+ } else {
+ char *last_arg_conf = arg_conf;
+ arg_conf = NULL;
+ arg_conf_len = asprintf(&arg_conf, "%s\ntimeout %d;", last_arg_conf, timeout_arg);
+
+ if ((arg_conf == 0) || (arg_conf_len == 0))
+ log_fatal("Unable to process --timeout timeout argument");
+
+ free(last_arg_conf);
+ }
+ }
+
+ if ((dhcp_vendor_class_identifier_arg != NULL) && (*dhcp_vendor_class_identifier_arg != '\0')) {
+ if (arg_conf == 0) {
+ arg_conf_len = asprintf(&arg_conf, "send vendor-class-identifier \"%s\";", dhcp_vendor_class_identifier_arg);
+
+ if ((arg_conf == 0) || (arg_conf_len <= 0))
+ log_fatal("Unable to send -V option vendor-class-identifier");
+ } else {
+ char *last_arg_conf = arg_conf;
+ arg_conf = NULL;
+ arg_conf_len = asprintf(&arg_conf, "%s\nsend vendor-class-identifier \"%s\";", last_arg_conf, dhcp_vendor_class_identifier_arg);
+
+ if ((arg_conf == 0) || (arg_conf_len <= 0))
+ log_fatal("Unable to send -V option vendor-class-identifier");
+
+ free(last_arg_conf);
+ }
+ }
+
+ if (dhclient_request_options != NULL) {
+ if (arg_conf == 0) {
+ arg_conf_len = asprintf(&arg_conf, "request %s;", dhclient_request_options);
+
+ if ((arg_conf == 0) || (arg_conf_len <= 0))
+ log_fatal("Unable to parse --request-options <request options list> argument");
+ } else {
+ char *last_arg_conf = arg_conf;
+ arg_conf = NULL;
+ arg_conf_len = asprintf(&arg_conf, "%s\nrequest %s;", last_arg_conf, dhclient_request_options);
+
+ if ((arg_conf == 0) || (arg_conf_len <= 0))
+ log_fatal("Unable to parse --request-options <request options list> argument");
+
+ free(last_arg_conf);
+ }
+ }
+
+ if (arg_conf) {
+ if (arg_conf_len == 0)
+ if ((arg_conf_len = strlen(arg_conf)) == 0)
+ /* huh ? cannot happen ! */
+ log_fatal("Unable to process -C/-H/-F/--timeout/-V/--request-options configuration arguments");
+
+ /* parse the extra dhclient.conf configuration arguments
+ * into top level config: */
+ struct parse *cfile = (struct parse *)0;
+ const char *val = NULL;
+ int token;
+
+ status = new_parse(&cfile, -1, arg_conf, arg_conf_len, "extra dhclient -C/-H/-F/--timeout/-V/--request-options configuration arguments", 0);
+
+ if ((status != ISC_R_SUCCESS) || (cfile -> warnings_occurred))
+ log_fatal("Cannot parse -C/-H/-F/--timeout/-V/--request-options configuration arguments !");
+ /* more detailed parse failures will be logged */
+
+ do {
+ token = peek_token(&val, (unsigned *)0, cfile);
+ if (token == END_OF_FILE)
+ break;
+
+ parse_client_statement(cfile, (struct interface_info *)0, &top_level_config);
+ } while (1);
+
+ if (cfile -> warnings_occurred)
+ log_fatal("Cannot parse -C/-H/-F/--timeout/-V/--request-options configuration arguments !");
+ end_parse(&cfile);
+
+ if (timeout_arg) {
+ /* we just set the toplevel timeout, but per-client
+ * timeouts may still be at defaults.
+ */
+ for (ip=interfaces; ip; ip = ip->next) {
+ if (ip->client->config->timeout == 60)
+ ip->client->config->timeout = timeout_arg;
+ }
+ }
+
+ if ((dhclient_request_options != 0) && (top_level_config.requested_options != default_requested_options)) {
+ for (ip=interfaces; ip; ip = ip->next) {
+ if (ip->client->config->requested_options == default_requested_options)
+ ip->client->config->requested_options = top_level_config.requested_options;
+ }
+ }
+
+ free(arg_conf);
+ arg_conf = NULL;
+ arg_conf_len = 0;
+ }
+
/* Parse the lease database. */
read_client_leases();
@@ -3226,7 +3483,8 @@ void make_discover (client, lease)
client -> packet.xid = random ();
client -> packet.secs = 0; /* filled in by send_discover. */
- if (can_receive_unicast_unconfigured (client -> interface))
+ if ((!(bootp_broadcast_always || client->config->bootp_broadcast_always))
+ && can_receive_unicast_unconfigured(client->interface))
client -> packet.flags = 0;
else
client -> packet.flags = htons (BOOTP_BROADCAST);
@@ -3311,7 +3569,9 @@ void make_request (client, lease)
} else {
memset (&client -> packet.ciaddr, 0,
sizeof client -> packet.ciaddr);
- if (can_receive_unicast_unconfigured (client -> interface))
+ if ((!(bootp_broadcast_always ||
+ client ->config->bootp_broadcast_always)) &&
+ can_receive_unicast_unconfigured (client -> interface))
client -> packet.flags = 0;
else
client -> packet.flags = htons (BOOTP_BROADCAST);
@@ -3374,7 +3634,8 @@ void make_decline (client, lease)
client -> packet.hops = 0;
client -> packet.xid = client -> xid;
client -> packet.secs = 0; /* Filled in by send_request. */
- if (can_receive_unicast_unconfigured (client -> interface))
+ if ((!(bootp_broadcast_always || client->config-> bootp_broadcast_always))
+ && can_receive_unicast_unconfigured (client->interface))
client -> packet.flags = 0;
else
client -> packet.flags = htons (BOOTP_BROADCAST);
diff --git a/common/conflex.c b/common/conflex.c
index 045b655..71c0bf5 100644
--- a/common/conflex.c
+++ b/common/conflex.c
@@ -832,6 +832,8 @@ intern(char *atom, enum dhcp_token dfv) {
if (!strcasecmp(atom+1, "ig-endian")) {
return TOKEN_BIG_ENDIAN;
}
+ if (!strcasecmp (atom + 1, "ootp-broadcast-always"))
+ return BOOTP_BROADCAST_ALWAYS;
break;
case 'c':
if (!strcasecmp(atom + 1, "ase"))
diff --git a/includes/dhcpd.h b/includes/dhcpd.h
index 5930e6a..018fa34 100644
--- a/includes/dhcpd.h
+++ b/includes/dhcpd.h
@@ -1269,6 +1269,9 @@ struct client_config {
int lease_id_format; /* format for IDs in lease file,
TOKEN_OCTAL or TOKEN_HEX */
+
+ int bootp_broadcast_always; /* If nonzero, always set the BOOTP_BROADCAST
+ flag in requests */
};
/* Per-interface state used in the dhcp client... */
diff --git a/includes/dhctoken.h b/includes/dhctoken.h
index 5920f4f..7e7215a 100644
--- a/includes/dhctoken.h
+++ b/includes/dhctoken.h
@@ -377,6 +377,7 @@ enum dhcp_token {
TOKEN_HEX = 677,
TOKEN_OCTAL = 678,
KEY_ALGORITHM = 679
+ BOOTP_BROADCAST_ALWAYS = 680
};
#define is_identifier(x) ((x) >= FIRST_TOKEN && \
--
2.14.5