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Commit a9530964 authored by Simon Kelley's avatar Simon Kelley
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Send "FTP transfer complete" events to the DHCP lease script.

parent 884a6dfe
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Showing with 355 additions and 194 deletions
CHANGELOG
View file @ a9530964
......@@ -24,6 +24,24 @@ version 2.61
Add --host-record. Thanks to Rob Zwissler for the
suggestion.
Invoke the DHCP script with action "tftp" when a TFTP file
transfer completes. The size of the file, address to which
it was sent and complete pathname are supplied. Note that
version 2.60 introduced some script incompatibilties
associated with DHCPv6, and this is a further change. To
be safe, scripts should ignore unknown actions, and if
not IPv6-aware, should exit if the environment
variable DNSMASQ_IAID is set. The use-case for this is
to track netboot/install. Suggestion from Shantanu
Gadgil.
Update contrib/port-forward/dnsmasq-portforward to reflect
the above.
Set the environment variable DNSMASQ_LOG_DHCP when running
the script id --log-dhcp is in effect, so that script can
taylor their logging verbosity. Suggestion from Malte Forkel.
version 2.60
Fix compilation problem in Mac OS X Lion. Thanks to Olaf
......
contrib/port-forward/dnsmasq-portforward
View file @ a9530964
......@@ -34,11 +34,21 @@ if [ ${DNSMASQ_OLD_HOSTNAME} ] && [ ${action} = old ] ; then
hostname=${DNSMASQ_OLD_HOSTNAME}
fi
# IPv6 leases are not our concern. no NAT there!
if [ ${DNSMASQ_IAID} ] ; then
exit 0
fi
# action init is not relevant, and will only be seen when leasefile-ro is set.
if [ ${action} = init ] ; then
exit 0
fi
# action tftp is not relevant.
if [ ${action} = tftp ] ; then
exit 0
fi
if [ ${hostname} ]; then
ports=$(sed -n -e "/^${hostname}\ .*/ s/^.* //p" ${PORTSFILE})
......
man/dnsmasq.8
View file @ a9530964
......@@ -1069,7 +1069,8 @@ re-intialised. The enterprise-id is assigned by IANA, and the uid is a
string of hex octets unique to a particular device.
.TP
.B \-6 --dhcp-script=<path>
Whenever a new DHCP lease is created, or an old one destroyed, the
Whenever a new DHCP lease is created, or an old one destroyed, or a
TFTP file transfer completes, the
executable specified by this option is run. <path>
must be an absolute pathname, no PATH search occurs.
The arguments to the process
......@@ -1119,6 +1120,8 @@ is known.
DNSMASQ_TAGS contains all the tags set during the
DHCP transaction, separated by spaces.
DNSMASQ_LOG_DHCP is set if --log-dhcp is in effect.
For IPv4 only:
DNSMASQ_CLIENT_ID if the host provided a client-id.
......@@ -1145,6 +1148,8 @@ only supplied for
since these data are not held in dnsmasq's lease
database.
All file descriptors are
closed except stdin, stdout and stderr which are open to /dev/null
(except in debug mode).
......@@ -1163,6 +1168,17 @@ all existing leases as they are read from the lease file. Expired
leases will be called with "del" and others with "old". When dnsmasq
receives a HUP signal, the script will be invoked for existing leases
with an "old " event.
There are two further actions which may appear as the first argument
to the script, "init" and "tftp". More may be added in the future, so
scripts should be written to ignore unknown actions. "init" is
decsribed below in
.B --leasefile-ro
The "tftp" action is invoked when a TFTP file transfer completes: the
arguments are the file size in bytes, the address to which the file
was sent, and the complete pathname of the file.
.TP
.B --dhcp-luascript=<path>
Specify a script written in Lua, to be run when leases are created,
......@@ -1176,11 +1192,13 @@ function, and may provide
and
.B shutdown
functions, which are called, without arguments when dnsmasq starts up
and terminates.
and terminates. It may also provide a
.B tftp
function.
The
.B lease
method receives the information detailed in
function receives the information detailed in
.B --dhcp-script.
It gets two arguments, firstly the action, which is a string
containing, "add", "old" or "del", and secondly a table of tag value
......@@ -1197,7 +1215,16 @@ for IPv4, and
.B client_duid, ip_address
and
.B hostname
for IPv6.
for IPv6.
The
.B tftp
function is called in the same way as the lease function, and the
table holds the tags
.B destination_address,
.B file_name
and
.B file_size.
.TP
.B --dhcp-scriptuser
Specify the user as which to run the lease-change script or Lua script. This defaults to root, but can be changed to another user using this flag.
......
src/dnsmasq.c
View file @ a9530964
......@@ -721,6 +721,10 @@ int main (int argc, char **argv)
# ifdef HAVE_SCRIPT
while (helper_buf_empty() && do_script_run(now));
# ifdef HAVE_TFTP
while (helper_buf_empty() && do_tftp_script_run());
# endif
if (!helper_buf_empty())
{
FD_SET(daemon->helperfd, &wset);
......@@ -729,6 +733,11 @@ int main (int argc, char **argv)
# else
/* need this for other side-effects */
while (do_script_run(now));
# ifdef HAVE_TFTP
while (do_tftp_script_run());
# endif
# endif
#endif
......
src/dnsmasq.h
View file @ a9530964
......@@ -458,6 +458,7 @@ struct frec {
#define ACTION_OLD_HOSTNAME 2
#define ACTION_OLD 3
#define ACTION_ADD 4
#define ACTION_TFTP 5
#define LEASE_NEW 1 /* newly created */
#define LEASE_CHANGED 2 /* modified */
......@@ -803,7 +804,7 @@ extern struct daemon {
#endif
/* TFTP stuff */
struct tftp_transfer *tftp_trans;
struct tftp_transfer *tftp_trans, *tftp_done_trans;
/* utility string buffer, hold max sized IP address as string */
char *addrbuff;
......@@ -1040,6 +1041,9 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd);
void helper_write(void);
void queue_script(int action, struct dhcp_lease *lease,
char *hostname, time_t now);
#ifdef HAVE_TFTP
void queue_tftp(off_t file_len, char *filename, union mysockaddr *peer);
#endif
int helper_buf_empty(void);
#endif
......@@ -1047,6 +1051,7 @@ int helper_buf_empty(void);
#ifdef HAVE_TFTP
void tftp_request(struct listener *listen, time_t now);
void check_tftp_listeners(fd_set *rset, time_t now);
int do_tftp_script_run(void);
#endif
/* conntrack.c */
......
src/helper.c
View file @ a9530964
......@@ -192,18 +192,24 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
#endif
_exit(0);
}
is6 = !!(data.flags & (LEASE_TA | LEASE_NA));
if (data.action == ACTION_DEL)
action_str = "del";
else if (data.action == ACTION_ADD)
action_str = "add";
else if (data.action == ACTION_OLD || data.action == ACTION_OLD_HOSTNAME)
action_str = "old";
else if (data.action == ACTION_TFTP)
{
action_str = "tftp";
is6 = (data.flags != AF_INET);
}
else
continue;
is6 = !!(data.flags & (LEASE_TA | LEASE_NA));
if (!is6)
{
/* stringify MAC into dhcp_buff */
......@@ -271,13 +277,16 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
char *dot;
hostname = (char *)buf;
hostname[data.hostname_len - 1] = 0;
if (!legal_hostname(hostname))
hostname = NULL;
else if ((dot = strchr(hostname, '.')))
if (data.action != ACTION_TFTP)
{
domain = dot+1;
*dot = 0;
}
if (!legal_hostname(hostname))
hostname = NULL;
else if ((dot = strchr(hostname, '.')))
{
domain = dot+1;
*dot = 0;
}
}
}
extradata = buf + data.hostname_len;
......@@ -289,116 +298,141 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
inet_ntop(AF_INET6, &data.hwaddr, daemon->addrbuff, ADDRSTRLEN);
#endif
/* file length */
if (data.action == ACTION_TFTP)
sprintf(daemon->dhcp_buff, "%u", data.hwaddr_len);
#ifdef HAVE_LUASCRIPT
if (daemon->luascript)
{
lua_getglobal(lua, "lease"); /* function to call */
lua_pushstring(lua, action_str); /* arg1 - action */
lua_newtable(lua); /* arg2 - data table */
if (is6)
if (data.action == ACTION_TFTP)
{
lua_pushstring(lua, daemon->dhcp_buff);
lua_setfield(lua, -2, "client_duid");
lua_pushstring(lua, daemon->packet);
lua_setfield(lua, -2, "server_duid");
lua_pushstring(lua, daemon->dhcp_buff3);
lua_setfield(lua, -2, "iaid");
}
if (!is6 && data.clid_len != 0)
{
lua_pushstring(lua, daemon->packet);
lua_setfield(lua, -2, "client_id");
lua_getglobal(lua, "tftp");
if (lua_type(lua, -1) != LUA_TFUNCTION)
lua_pop(lua, 1); /* tftp function optional */
else
{
lua_pushstring(lua, action_str); /* arg1 - action */
lua_newtable(lua); /* arg2 - data table */
lua_pushstring(lua, daemon->addrbuff);
lua_setfield(lua, -2, "destination_address");
lua_pushstring(lua, hostname);
lua_setfield(lua, -2, "file_name");
lua_pushstring(lua, daemon->dhcp_buff);
lua_setfield(lua, -2, "file_size");
lua_call(lua, 2, 0); /* pass 2 values, expect 0 */
}
}
if (strlen(data.interface) != 0)
else
{
lua_pushstring(lua, data.interface);
lua_setfield(lua, -2, "interface");
}
lua_getglobal(lua, "lease"); /* function to call */
lua_pushstring(lua, action_str); /* arg1 - action */
lua_newtable(lua); /* arg2 - data table */
if (is6)
{
lua_pushstring(lua, daemon->dhcp_buff);
lua_setfield(lua, -2, "client_duid");
lua_pushstring(lua, daemon->packet);
lua_setfield(lua, -2, "server_duid");
lua_pushstring(lua, daemon->dhcp_buff3);
lua_setfield(lua, -2, "iaid");
}
if (!is6 && data.clid_len != 0)
{
lua_pushstring(lua, daemon->packet);
lua_setfield(lua, -2, "client_id");
}
if (strlen(data.interface) != 0)
{
lua_pushstring(lua, data.interface);
lua_setfield(lua, -2, "interface");
}
#ifdef HAVE_BROKEN_RTC
lua_pushnumber(lua, data.length);
lua_setfield(lua, -2, "lease_length");
lua_pushnumber(lua, data.length);
lua_setfield(lua, -2, "lease_length");
#else
lua_pushnumber(lua, data.expires);
lua_setfield(lua, -2, "lease_expires");
lua_pushnumber(lua, data.expires);
lua_setfield(lua, -2, "lease_expires");
#endif
if (hostname)
{
lua_pushstring(lua, hostname);
lua_setfield(lua, -2, "hostname");
}
if (domain)
{
lua_pushstring(lua, domain);
lua_setfield(lua, -2, "domain");
}
end = extradata + data.ed_len;
buf = extradata;
if (!is6)
buf = grab_extradata_lua(buf, end, "vendor_class");
if (hostname)
{
lua_pushstring(lua, hostname);
lua_setfield(lua, -2, "hostname");
}
if (domain)
{
lua_pushstring(lua, domain);
lua_setfield(lua, -2, "domain");
}
end = extradata + data.ed_len;
buf = extradata;
if (!is6)
buf = grab_extradata_lua(buf, end, "vendor_class");
#ifdef HAVE_DHCP6
else
for (i = 0; i < data.hwaddr_len; i++)
{
sprintf(daemon->dhcp_buff2, "vendor_class%i", i);
buf = grab_extradata_lua(buf, end, daemon->dhcp_buff2);
}
else
for (i = 0; i < data.hwaddr_len; i++)
{
sprintf(daemon->dhcp_buff2, "vendor_class%i", i);
buf = grab_extradata_lua(buf, end, daemon->dhcp_buff2);
}
#endif
buf = grab_extradata_lua(buf, end, "supplied_hostname");
if (!is6)
{
buf = grab_extradata_lua(buf, end, "cpewan_oui");
buf = grab_extradata_lua(buf, end, "cpewan_serial");
buf = grab_extradata_lua(buf, end, "cpewan_class");
}
buf = grab_extradata_lua(buf, end, "tags");
if (is6)
buf = grab_extradata_lua(buf, end, "relay_address");
else if (data.giaddr.s_addr != 0)
{
lua_pushstring(lua, inet_ntoa(data.giaddr));
lua_setfield(lua, -2, "relay_address");
}
for (i = 0; buf; i++)
{
sprintf(daemon->dhcp_buff2, "user_class%i", i);
buf = grab_extradata_lua(buf, end, daemon->dhcp_buff2);
}
if (data.action != ACTION_DEL && data.remaining_time != 0)
{
lua_pushnumber(lua, data.remaining_time);
lua_setfield(lua, -2, "time_remaining");
}
if (data.action == ACTION_OLD_HOSTNAME && hostname)
{
lua_pushstring(lua, hostname);
lua_setfield(lua, -2, "old_hostname");
}
if (!is6)
{
lua_pushstring(lua, daemon->dhcp_buff);
lua_setfield(lua, -2, "mac_address");
buf = grab_extradata_lua(buf, end, "supplied_hostname");
if (!is6)
{
buf = grab_extradata_lua(buf, end, "cpewan_oui");
buf = grab_extradata_lua(buf, end, "cpewan_serial");
buf = grab_extradata_lua(buf, end, "cpewan_class");
}
buf = grab_extradata_lua(buf, end, "tags");
if (is6)
buf = grab_extradata_lua(buf, end, "relay_address");
else if (data.giaddr.s_addr != 0)
{
lua_pushstring(lua, inet_ntoa(data.giaddr));
lua_setfield(lua, -2, "relay_address");
}
for (i = 0; buf; i++)
{
sprintf(daemon->dhcp_buff2, "user_class%i", i);
buf = grab_extradata_lua(buf, end, daemon->dhcp_buff2);
}
if (data.action != ACTION_DEL && data.remaining_time != 0)
{
lua_pushnumber(lua, data.remaining_time);
lua_setfield(lua, -2, "time_remaining");
}
if (data.action == ACTION_OLD_HOSTNAME && hostname)
{
lua_pushstring(lua, hostname);
lua_setfield(lua, -2, "old_hostname");
}
if (!is6)
{
lua_pushstring(lua, daemon->dhcp_buff);
lua_setfield(lua, -2, "mac_address");
}
lua_pushstring(lua, daemon->addrbuff);
lua_setfield(lua, -2, "ip_address");
lua_call(lua, 2, 0); /* pass 2 values, expect 0 */
}
lua_pushstring(lua, daemon->addrbuff);
lua_setfield(lua, -2, "ip_address");
lua_call(lua, 2, 0); /* pass 2 values, expect 0 */
}
#endif
......@@ -439,81 +473,87 @@ int create_helper(int event_fd, int err_fd, uid_t uid, gid_t gid, long max_fd)
continue;
}
if (is6)
if (data.action != ACTION_TFTP)
{
my_setenv("DNSMASQ_IAID", daemon->dhcp_buff3, &err);
my_setenv("DNSMASQ_SERVER_DUID", daemon->packet, &err);
}
if (!is6 && data.clid_len != 0)
my_setenv("DNSMASQ_CLIENT_ID", daemon->packet, &err);
if (strlen(data.interface) != 0)
my_setenv("DNSMASQ_INTERFACE", data.interface, &err);
if (is6)
{
my_setenv("DNSMASQ_IAID", daemon->dhcp_buff3, &err);
my_setenv("DNSMASQ_SERVER_DUID", daemon->packet, &err);
}
if (!is6 && data.clid_len != 0)
my_setenv("DNSMASQ_CLIENT_ID", daemon->packet, &err);
if (strlen(data.interface) != 0)
my_setenv("DNSMASQ_INTERFACE", data.interface, &err);
#ifdef HAVE_BROKEN_RTC
my_setenv("DNSMASQ_LEASE_LENGTH", daemon->dhcp_buff2, &err);
my_setenv("DNSMASQ_LEASE_LENGTH", daemon->dhcp_buff2, &err);
#else
my_setenv("DNSMASQ_LEASE_EXPIRES", daemon->dhcp_buff2, &err);
my_setenv("DNSMASQ_LEASE_EXPIRES", daemon->dhcp_buff2, &err);
#endif
if (domain)
my_setenv("DNSMASQ_DOMAIN", domain, &err);
end = extradata + data.ed_len;
buf = extradata;
if (!is6)
buf = grab_extradata(buf, end, "DNSMASQ_VENDOR_CLASS", &err);
if (domain)
my_setenv("DNSMASQ_DOMAIN", domain, &err);
end = extradata + data.ed_len;
buf = extradata;
if (!is6)
buf = grab_extradata(buf, end, "DNSMASQ_VENDOR_CLASS", &err);
#ifdef HAVE_DHCP6
else
{
if (data.hwaddr_len != 0)
else
{
buf = grab_extradata(buf, end, "DNSMASQ_VENDOR_CLASS_ID", &err);
for (i = 0; i < data.hwaddr_len - 1; i++)
if (data.hwaddr_len != 0)
{
sprintf(daemon->dhcp_buff2, "DNSMASQ_VENDOR_CLASS%i", i);
buf = grab_extradata(buf, end, daemon->dhcp_buff2, &err);
buf = grab_extradata(buf, end, "DNSMASQ_VENDOR_CLASS_ID", &err);
for (i = 0; i < data.hwaddr_len - 1; i++)
{
sprintf(daemon->dhcp_buff2, "DNSMASQ_VENDOR_CLASS%i", i);
buf = grab_extradata(buf, end, daemon->dhcp_buff2, &err);
}
}
}
}
#endif
buf = grab_extradata(buf, end, "DNSMASQ_SUPPLIED_HOSTNAME", &err);
if (!is6)
{
buf = grab_extradata(buf, end, "DNSMASQ_CPEWAN_OUI", &err);
buf = grab_extradata(buf, end, "DNSMASQ_CPEWAN_SERIAL", &err);
buf = grab_extradata(buf, end, "DNSMASQ_CPEWAN_CLASS", &err);
}
buf = grab_extradata(buf, end, "DNSMASQ_TAGS", &err);
if (is6)
buf = grab_extradata(buf, end, "DNSMASQ_RELAY_ADDRESS", &err);
else if (data.giaddr.s_addr != 0)
my_setenv("DNSMASQ_RELAY_ADDRESS", inet_ntoa(data.giaddr), &err);
for (i = 0; buf; i++)
{
sprintf(daemon->dhcp_buff2, "DNSMASQ_USER_CLASS%i", i);
buf = grab_extradata(buf, end, daemon->dhcp_buff2, &err);
}
if (data.action != ACTION_DEL && data.remaining_time != 0)
{
sprintf(daemon->dhcp_buff2, "%u", data.remaining_time);
my_setenv("DNSMASQ_TIME_REMAINING", daemon->dhcp_buff2, &err);
}
if (data.action == ACTION_OLD_HOSTNAME && hostname)
{
my_setenv("DNSMASQ_OLD_HOSTNAME", hostname, &err);
hostname = NULL;
buf = grab_extradata(buf, end, "DNSMASQ_SUPPLIED_HOSTNAME", &err);
if (!is6)
{
buf = grab_extradata(buf, end, "DNSMASQ_CPEWAN_OUI", &err);
buf = grab_extradata(buf, end, "DNSMASQ_CPEWAN_SERIAL", &err);
buf = grab_extradata(buf, end, "DNSMASQ_CPEWAN_CLASS", &err);
}
buf = grab_extradata(buf, end, "DNSMASQ_TAGS", &err);
if (is6)
buf = grab_extradata(buf, end, "DNSMASQ_RELAY_ADDRESS", &err);
else if (data.giaddr.s_addr != 0)
my_setenv("DNSMASQ_RELAY_ADDRESS", inet_ntoa(data.giaddr), &err);
for (i = 0; buf; i++)
{
sprintf(daemon->dhcp_buff2, "DNSMASQ_USER_CLASS%i", i);
buf = grab_extradata(buf, end, daemon->dhcp_buff2, &err);
}
if (data.action != ACTION_DEL && data.remaining_time != 0)
{
sprintf(daemon->dhcp_buff2, "%u", data.remaining_time);
my_setenv("DNSMASQ_TIME_REMAINING", daemon->dhcp_buff2, &err);
}
if (data.action == ACTION_OLD_HOSTNAME && hostname)
{
my_setenv("DNSMASQ_OLD_HOSTNAME", hostname, &err);
hostname = NULL;
}
}
if (option_bool(OPT_LOG_OPTS))
my_setenv("DNSMASQ_LOG_DHCP", "1", &err);
/* we need to have the event_fd around if exec fails */
if ((i = fcntl(event_fd, F_GETFD)) != -1)
fcntl(event_fd, F_SETFD, i | FD_CLOEXEC);
......@@ -584,11 +624,29 @@ static unsigned char *grab_extradata_lua(unsigned char *buf, unsigned char *end,
}
#endif
static void buff_alloc(size_t size)
{
if (size > buf_size)
{
struct script_data *new;
/* start with reasonable size, will almost never need extending. */
if (size < sizeof(struct script_data) + 200)
size = sizeof(struct script_data) + 200;
if (!(new = whine_malloc(size)))
return;
if (buf)
free(buf);
buf = new;
buf_size = size;
}
}
/* pack up lease data into a buffer */
void queue_script(int action, struct dhcp_lease *lease, char *hostname, time_t now)
{
unsigned char *p;
size_t size;
unsigned int hostname_len = 0, clid_len = 0, ed_len = 0;
int fd = daemon->dhcpfd;
......@@ -608,23 +666,7 @@ void queue_script(int action, struct dhcp_lease *lease, char *hostname, time_t n
if (hostname)
hostname_len = strlen(hostname) + 1;
size = sizeof(struct script_data) + clid_len + ed_len + hostname_len;
if (size > buf_size)
{
struct script_data *new;
/* start with reasonable size, will almost never need extending. */
if (size < sizeof(struct script_data) + 200)
size = sizeof(struct script_data) + 200;
if (!(new = whine_malloc(size)))
return;
if (buf)
free(buf);
buf = new;
buf_size = size;
}
buff_alloc(sizeof(struct script_data) + clid_len + ed_len + hostname_len);
buf->action = action;
buf->flags = lease->flags;
......@@ -669,6 +711,37 @@ void queue_script(int action, struct dhcp_lease *lease, char *hostname, time_t n
bytes_in_buf = p - (unsigned char *)buf;
}
#ifdef HAVE_TFTP
/* This nastily re-uses DHCP-fields for TFTP stuff */
void queue_tftp(off_t file_len, char *filename, union mysockaddr *peer)
{
unsigned int filename_len;
/* no script */
if (daemon->helperfd == -1)
return;
filename_len = strlen(filename) + 1;
buff_alloc(sizeof(struct script_data) + filename_len);
memset(buf, 0, sizeof(struct script_data));
buf->action = ACTION_TFTP;
buf->hostname_len = filename_len;
buf->hwaddr_len = file_len;
if ((buf->flags = peer->sa.sa_family) == AF_INET)
buf->addr = peer->in.sin_addr;
#ifdef HAVE_IPV6
else
memcpy(buf->hwaddr, &peer->in6.sin6_addr, IN6ADDRSZ);
#endif
memcpy((unsigned char *)(buf+1), filename, filename_len);
bytes_in_buf = sizeof(struct script_data) + filename_len;
}
#endif
int helper_buf_empty(void)
{
return bytes_in_buf == 0;
......
src/tftp.c
View file @ a9530964
......@@ -571,7 +571,9 @@ void check_tftp_listeners(fd_set *rset, time_t now)
my_syslog(MS_TFTP | LOG_INFO, _("sent %s to %s"), transfer->file->filename, daemon->addrbuff);
/* unlink */
*up = tmp;
free_transfer(transfer);
/* put on queue to be sent to script and deleted */
transfer->next = daemon->tftp_done_trans;
daemon->tftp_done_trans = transfer;
continue;
}
}
......@@ -709,4 +711,21 @@ static ssize_t get_block(char *packet, struct tftp_transfer *transfer)
}
}
int do_tftp_script_run(void)
{
struct tftp_transfer *transfer;
if ((transfer = daemon->tftp_done_trans))
{
daemon->tftp_done_trans = transfer->next;
#ifdef HAVE_SCRIPT
queue_tftp(transfer->file->size, transfer->file->filename, &transfer->peer);
#endif
free_transfer(transfer);
return 1;
}
return 0;
}
#endif
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