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import of dnsmasq-2.6.tar.gz

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This commit is contained in:
Simon Kelley
2004-04-03 21:10:00 +01:00
parent 8a911ccc75
commit 33820b7ed9
16 changed files with 865 additions and 365 deletions
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152
src/rfc2131.c
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@@ -63,8 +63,12 @@ static unsigned char *do_req_options(struct dhcp_context *context,
char *domainname, char *hostname,
struct in_addr router,
struct in_addr iface_addr,
int iface_mtu);
int iface_mtu, char *netid);
static int have_config(struct dhcp_config *config, unsigned int mask)
{
return config && (config->flags & mask);
}
int dhcp_reply(struct dhcp_context *context,
struct in_addr iface_addr,
@@ -88,13 +92,27 @@ int dhcp_reply(struct dhcp_context *context,
char *message = NULL;
unsigned int renewal_time, expires_time, def_time;
struct dhcp_config *config;
char *netid;
if (mess->op != BOOTREQUEST ||
mess->htype != ARPHRD_ETHER ||
mess->hlen != ETHER_ADDR_LEN ||
mess->cookie != htonl(DHCP_COOKIE))
return 0;
return 0;
/* Token ring is supported when we have packet sockets
to make the HW headers for us. We don't have the code to build
token ring headers when using BPF. We rely on the fact that
token ring hwaddrs are the same size as ethernet hwaddrs. */
#ifdef HAVE_BPF
if (mess->htype != ARPHRD_ETHER)
return 0;
#else
if (mess->htype != ARPHRD_ETHER &&
mess->htype != ARPHRD_IEEE802)
return 0;
#endif
mess->op = BOOTREPLY;
if ((opt = option_find(mess, sz, OPTION_MAXMESSAGE)))
@@ -130,9 +148,9 @@ int dhcp_reply(struct dhcp_context *context,
memcpy(req_options, option_ptr(opt), len);
req_options[len] = OPTION_END;
}
if ((config = find_config(dhcp_configs, context, clid, clid_len, mess->chaddr, NULL)) &&
config->hostname)
have_config(config, CONFIG_NAME))
hostname = config->hostname;
else if ((opt = option_find(mess, sz, OPTION_HOSTNAME)))
{
@@ -164,7 +182,8 @@ int dhcp_reply(struct dhcp_context *context,
/* search again now we have a hostname */
config = find_config(dhcp_configs, context, clid, clid_len, mess->chaddr, hostname);
def_time = config && config->lease_time ? config->lease_time : context->lease_time;
def_time = have_config(config, CONFIG_TIME) ? config->lease_time : context->lease_time;
netid = have_config(config, CONFIG_NETID) ? config->netid : context->netid;
if ((opt = option_find(mess, sz, OPTION_LEASE_TIME)))
{
@@ -219,11 +238,11 @@ int dhcp_reply(struct dhcp_context *context,
if (lease && lease->addr.s_addr == option_addr(opt).s_addr)
lease_prune(lease, now);
if (config && config->addr.s_addr &&
if (have_config(config, CONFIG_ADDR) &&
config->addr.s_addr == option_addr(opt).s_addr)
{
syslog(LOG_WARNING, "disabling DHCP static address %s", inet_ntoa(config->addr));
config->addr.s_addr = 0;
config->flags &= ~CONFIG_ADDR ;
}
return 0;
@@ -244,9 +263,9 @@ int dhcp_reply(struct dhcp_context *context,
if ((opt = option_find(mess, sz, OPTION_REQUESTED_IP)))
mess->yiaddr = option_addr(opt);
log_packet("DISCOVER", opt ? &mess->yiaddr : NULL, mess->chaddr, iface_name, NULL);
if (config && config->addr.s_addr && !lease_find_by_addr(config->addr))
if (have_config(config, CONFIG_DISABLE))
message = "ignored";
else if (have_config(config, CONFIG_ADDR) && !lease_find_by_addr(config->addr))
mess->yiaddr = config->addr;
else if (lease &&
((lease->addr.s_addr & context->netmask.s_addr) ==
@@ -254,18 +273,19 @@ int dhcp_reply(struct dhcp_context *context,
mess->yiaddr = lease->addr;
else if ((!opt || !address_available(context, mess->yiaddr)) &&
!address_allocate(context, dhcp_configs, &mess->yiaddr))
{
syslog(LOG_WARNING, "address pool exhausted");
return 0;
}
message = "no address available";
log_packet("DISCOVER", opt ? &mess->yiaddr : NULL, mess->chaddr, iface_name, message);
if (message)
return 0;
bootp_option_put(mess, dhcp_file, dhcp_sname);
mess->siaddr = dhcp_next_server;
p = option_put(p, end, OPTION_MESSAGE_TYPE, 1, DHCPOFFER);
p = option_put(p, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(iface_addr.s_addr));
p = option_put(p, end, OPTION_LEASE_TIME, 4, expires_time);
p = do_req_options(context, p, end, req_options, dhcp_opts, domain_suffix,
NULL, router, iface_addr, iface_mtu);
NULL, router, iface_addr, iface_mtu, netid);
p = option_put(p, end, OPTION_END, 0, 0);
log_packet("OFFER" , &mess->yiaddr, mess->chaddr, iface_name, NULL);
@@ -297,7 +317,7 @@ int dhcp_reply(struct dhcp_context *context,
if (!lease)
{
if (!address_available(context, mess->yiaddr) &&
(!config || config->addr.s_addr == 0 || config->addr.s_addr != mess->yiaddr.s_addr))
(!have_config(config, CONFIG_ADDR) || config->addr.s_addr != mess->yiaddr.s_addr))
message = "address unavailable";
else if (!(lease = lease_allocate(clid, clid_len, mess->yiaddr)))
message = "no leases left";
@@ -319,6 +339,9 @@ int dhcp_reply(struct dhcp_context *context,
if ((mess->yiaddr.s_addr & context->netmask.s_addr) != (context->start.s_addr & context->netmask.s_addr))
message = "wrong network";
if (have_config(config, CONFIG_DISABLE))
message = "disabled";
log_packet("REQUEST", &mess->yiaddr, mess->chaddr, iface_name, NULL);
if (message)
@@ -354,17 +377,23 @@ int dhcp_reply(struct dhcp_context *context,
p = option_put(p, end, OPTION_T2, 4, ((renewal_time * 7)/8) - fuzz);
}
p = do_req_options(context, p, end, req_options, dhcp_opts, domain_suffix,
hostname, router, iface_addr, iface_mtu);
hostname, router, iface_addr, iface_mtu, netid);
p = option_put(p, end, OPTION_END, 0, 0);
return p - (unsigned char *)mess;
case DHCPINFORM:
if (have_config(config, CONFIG_DISABLE))
{
log_packet("INFORM", &mess->ciaddr, mess->chaddr, iface_name, "ignored");
return 0;
}
log_packet("INFORM", &mess->ciaddr, mess->chaddr, iface_name, NULL);
p = option_put(p, end, OPTION_MESSAGE_TYPE, 1, DHCPACK);
p = option_put(p, end, OPTION_SERVER_IDENTIFIER, INADDRSZ, ntohl(iface_addr.s_addr));
p = do_req_options(context, p, end, req_options, dhcp_opts, domain_suffix,
hostname, router, iface_addr, iface_mtu);
hostname, router, iface_addr, iface_mtu, netid);
p = option_put(p, end, OPTION_END, 0, 0);
log_packet("ACK", &mess->ciaddr, mess->chaddr, iface_name, hostname);
@@ -524,11 +553,11 @@ static int in_list(unsigned char *list, int opt)
return 0;
}
static struct dhcp_opt *option_find2(struct dhcp_context *context, struct dhcp_opt *opts, int opt)
static struct dhcp_opt *option_find2(char *netid, struct dhcp_opt *opts, int opt)
{
for (; opts; opts = opts->next)
if (opts->opt == opt &&
(!opts->netid || (context->netid && strcmp(opts->netid, context->netid) == 0)))
(!opts->netid || (netid && strcmp(opts->netid, netid) == 0)))
return opts;
return NULL;
}
@@ -540,7 +569,7 @@ static unsigned char *do_req_options(struct dhcp_context *context,
char *domainname, char *hostname,
struct in_addr router,
struct in_addr iface_addr,
int iface_mtu)
int iface_mtu, char *netid)
{
int i;
@@ -553,24 +582,24 @@ static unsigned char *do_req_options(struct dhcp_context *context,
iface_mtu : DNSMASQ_PACKETSZ);
if (in_list(req_options, OPTION_NETMASK) &&
!option_find2(context, config_opts, OPTION_NETMASK))
!option_find2(netid, config_opts, OPTION_NETMASK))
p = option_put(p, end, OPTION_NETMASK, INADDRSZ, ntohl(context->netmask.s_addr));
if (in_list(req_options, OPTION_BROADCAST) &&
!option_find2(context, config_opts, OPTION_BROADCAST))
!option_find2(netid, config_opts, OPTION_BROADCAST))
p = option_put(p, end, OPTION_BROADCAST, INADDRSZ, ntohl(context->broadcast.s_addr));
if (in_list(req_options, OPTION_ROUTER) &&
!option_find2(context, config_opts, OPTION_ROUTER))
!option_find2(netid, config_opts, OPTION_ROUTER))
p = option_put(p, end, OPTION_ROUTER, INADDRSZ,
ntohl(router.s_addr));
if (in_list(req_options, OPTION_DNSSERVER) &&
!option_find2(context, config_opts, OPTION_DNSSERVER))
!option_find2(netid, config_opts, OPTION_DNSSERVER))
p = option_put(p, end, OPTION_DNSSERVER, INADDRSZ, ntohl(iface_addr.s_addr));
if (domainname && in_list(req_options, OPTION_DOMAINNAME) &&
!option_find2(context, config_opts, OPTION_DOMAINNAME))
!option_find2(netid, config_opts, OPTION_DOMAINNAME))
p = option_put_string(p, end, OPTION_DOMAINNAME, domainname);
/* Note that we ignore attempts to set the hostname using
@@ -580,38 +609,49 @@ static unsigned char *do_req_options(struct dhcp_context *context,
for (i = 0; req_options[i] != OPTION_END; i++)
{
struct dhcp_opt *opt = option_find2(context, config_opts, req_options[i]);
if (req_options[i] != OPTION_HOSTNAME &&
req_options[i] != OPTION_MAXMESSAGE &&
opt && (p + opt->len + 3 < end))
struct dhcp_opt *opt;
if (req_options[i] == OPTION_HOSTNAME ||
req_options[i] == OPTION_MAXMESSAGE ||
!(opt = option_find2(netid, config_opts, req_options[i])) ||
(p + opt->len + 3 >= end))
continue;
/* For the options we have default values on
dhc-option=<optionno> means "don't include this option"
not "include a zero-length option" */
if (opt->len == 0 &&
(opt->opt == OPTION_NETMASK ||
opt->opt == OPTION_BROADCAST ||
opt->opt == OPTION_ROUTER ||
opt->opt == OPTION_DNSSERVER))
continue;
*(p++) = opt->opt;
*(p++) = opt->len;
if (opt->len == 0)
continue;
if (opt->is_addr)
{
*(p++) = opt->opt;
*(p++) = opt->len;
if (opt->len != 0)
int j;
struct in_addr *a = (struct in_addr *)opt->val;
for (j = 0; j < opt->len; j+=INADDRSZ, a++)
{
if (opt->is_addr)
{
int j;
struct in_addr *a = (struct in_addr *)opt->val;
for (j = 0; j < opt->len; j+=INADDRSZ, a++)
{
/* zero means "self" */
if (a->s_addr == 0)
memcpy(p, &iface_addr, INADDRSZ);
else
memcpy(p, a, INADDRSZ);
p += INADDRSZ;
}
}
/* zero means "self" */
if (a->s_addr == 0)
memcpy(p, &iface_addr, INADDRSZ);
else
{
memcpy(p, opt->val, opt->len);
p += opt->len;
}
memcpy(p, a, INADDRSZ);
p += INADDRSZ;
}
}
}
else
{
memcpy(p, opt->val, opt->len);
p += opt->len;
}
}
return p;
}