dnsmasq: backport --tftp-no-fail to ignore missing tftp root
This patch backports the option --tftp-no-fail to dnsmasq and prevents the service from aborting if the specified TFTP root directory is not available; this might be the case if TFTP files are located on external media that might occasionally not be present at startup. Signed-off-by: Stefan Tomanek <stefan.tomanek+openwrt@wertarbyte.de> SVN-Revision: 45213
This commit is contained in:
John Crispin
parent
3ec7ccf501
commit
8acbb5783d
2 changed files with 194 additions and 0 deletions
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@ -128,6 +128,7 @@ dnsmasq() {
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append_bool "$cfg" boguspriv "--bogus-priv"
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append_bool "$cfg" expandhosts "--expand-hosts"
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append_bool "$cfg" enable_tftp "--enable-tftp"
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append_bool "$cfg" tftp_no_fail "--tftp-no-fail"
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append_bool "$cfg" nonwildcard "--bind-interfaces"
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append_bool "$cfg" fqdn "--dhcp-fqdn"
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append_bool "$cfg" proxydnssec "--proxy-dnssec"
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@ -0,0 +1,193 @@
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From 56920681eaf2c5eb08fc75baee4939d15d03b0ea Mon Sep 17 00:00:00 2001
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From: Stefan Tomanek <stefan.tomanek+dnsmasq@wertarbyte.de>
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Date: Tue, 31 Mar 2015 22:32:11 +0100
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Subject: [PATCH] add --tftp-no-fail to ignore missing tftp root
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(cherry picked from commit 30d0879ed55cb67b1b735beab3d93f3bb3ef1dd2)
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Conflicts:
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CHANGELOG
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src/dnsmasq.c
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src/dnsmasq.h
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src/option.c
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---
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dnsmasq.conf.example | 3 +++
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man/dnsmasq.8 | 3 +++
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src/dnsmasq.c | 42 +++++++++++++++++++++++++++++++-----------
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src/dnsmasq.h | 4 +++-
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src/option.c | 3 +++
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5 files changed, 43 insertions(+), 12 deletions(-)
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diff --git a/dnsmasq.conf.example b/dnsmasq.conf.example
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index 1bd305d..67be99a 100644
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--- a/dnsmasq.conf.example
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+++ b/dnsmasq.conf.example
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@@ -486,6 +486,9 @@
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# Set the root directory for files available via FTP.
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#tftp-root=/var/ftpd
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+# Do not abort if the tftp-root is unavailable
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+#tftp-no-fail
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+
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# Make the TFTP server more secure: with this set, only files owned by
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# the user dnsmasq is running as will be send over the net.
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#tftp-secure
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diff --git a/man/dnsmasq.8 b/man/dnsmasq.8
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index 0b8e04f..2ff4b96 100644
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--- a/man/dnsmasq.8
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+++ b/man/dnsmasq.8
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@@ -1670,6 +1670,9 @@ Absolute paths (starting with /) are allowed, but they must be within
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the tftp-root. If the optional interface argument is given, the
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directory is only used for TFTP requests via that interface.
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.TP
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+.B --tftp-no-fail
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+Do not abort startup if specified tftp root directories are inaccessible.
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+.TP
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.B --tftp-unique-root
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Add the IP address of the TFTP client as a path component on the end
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of the TFTP-root (in standard dotted-quad format). Only valid if a
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diff --git a/src/dnsmasq.c b/src/dnsmasq.c
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index 5c7750d..b6fa285 100644
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--- a/src/dnsmasq.c
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+++ b/src/dnsmasq.c
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@@ -58,6 +58,9 @@ int main (int argc, char **argv)
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struct dhcp_context *context;
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struct dhcp_relay *relay;
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#endif
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+#ifdef HAVE_TFTP
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+ int tftp_prefix_missing = 0;
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+#endif
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#ifdef LOCALEDIR
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setlocale(LC_ALL, "");
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@@ -623,7 +626,7 @@ int main (int argc, char **argv)
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#endif
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#ifdef HAVE_TFTP
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- if (option_bool(OPT_TFTP))
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+ if (option_bool(OPT_TFTP))
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{
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DIR *dir;
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struct tftp_prefix *p;
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@@ -632,24 +635,33 @@ int main (int argc, char **argv)
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{
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if (!((dir = opendir(daemon->tftp_prefix))))
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{
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- send_event(err_pipe[1], EVENT_TFTP_ERR, errno, daemon->tftp_prefix);
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- _exit(0);
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+ tftp_prefix_missing = 1;
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+ if (!option_bool(OPT_TFTP_NO_FAIL))
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+ {
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+ send_event(err_pipe[1], EVENT_TFTP_ERR, errno, daemon->tftp_prefix);
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+ _exit(0);
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+ }
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}
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closedir(dir);
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}
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-
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+
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for (p = daemon->if_prefix; p; p = p->next)
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{
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+ p->missing = 0;
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if (!((dir = opendir(p->prefix))))
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- {
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- send_event(err_pipe[1], EVENT_TFTP_ERR, errno, p->prefix);
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- _exit(0);
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- }
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+ {
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+ p->missing = 1;
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+ if (!option_bool(OPT_TFTP_NO_FAIL))
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+ {
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+ send_event(err_pipe[1], EVENT_TFTP_ERR, errno, p->prefix);
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+ _exit(0);
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+ }
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+ }
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closedir(dir);
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}
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}
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#endif
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-
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+
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if (daemon->port == 0)
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my_syslog(LOG_INFO, _("started, version %s DNS disabled"), VERSION);
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else if (daemon->cachesize != 0)
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@@ -743,8 +755,9 @@ int main (int argc, char **argv)
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#endif
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#ifdef HAVE_TFTP
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- if (option_bool(OPT_TFTP))
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- {
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+ if (option_bool(OPT_TFTP))
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+ {
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+ struct tftp_prefix *p;
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#ifdef FD_SETSIZE
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if (FD_SETSIZE < (unsigned)max_fd)
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max_fd = FD_SETSIZE;
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@@ -754,7 +767,14 @@ int main (int argc, char **argv)
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daemon->tftp_prefix ? _("root is ") : _("enabled"),
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daemon->tftp_prefix ? daemon->tftp_prefix: "",
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option_bool(OPT_TFTP_SECURE) ? _("secure mode") : "");
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+
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+ if (tftp_prefix_missing)
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+ my_syslog(MS_TFTP | LOG_WARNING, _("warning: %s inaccessible"), daemon->tftp_prefix);
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+ for (p = daemon->if_prefix; p; p = p->next)
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+ if (p->missing)
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+ my_syslog(MS_TFTP | LOG_WARNING, _("warning: TFTP directory %s inaccessible"), p->prefix);
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+
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/* This is a guess, it assumes that for small limits,
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disjoint files might be served, but for large limits,
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a single file will be sent to may clients (the file only needs
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diff --git a/src/dnsmasq.h b/src/dnsmasq.h
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index 1dd61c5..086cb67 100644
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--- a/src/dnsmasq.h
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+++ b/src/dnsmasq.h
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@@ -238,7 +238,8 @@ struct event_desc {
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#define OPT_DNSSEC_NO_SIGN 48
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#define OPT_LOCAL_SERVICE 49
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#define OPT_LOOP_DETECT 50
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-#define OPT_LAST 51
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+#define OPT_TFTP_NO_FAIL 51
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+#define OPT_LAST 52
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/* extra flags for my_syslog, we use a couple of facilities since they are known
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not to occupy the same bits as priorities, no matter how syslog.h is set up. */
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@@ -888,6 +889,7 @@ struct addr_list {
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struct tftp_prefix {
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char *interface;
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char *prefix;
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+ int missing;
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struct tftp_prefix *next;
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};
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diff --git a/src/option.c b/src/option.c
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index 209fa69..fa5e4d3 100644
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--- a/src/option.c
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+++ b/src/option.c
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@@ -147,6 +147,7 @@ struct myoption {
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#define LOPT_LOCAL_SERVICE 335
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#define LOPT_DNSSEC_TIME 336
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#define LOPT_LOOP_DETECT 337
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+#define LOPT_TFTP_NO_FAIL 338
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#ifdef HAVE_GETOPT_LONG
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static const struct option opts[] =
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@@ -227,6 +228,7 @@ static const struct myoption opts[] =
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{ "dhcp-ignore-names", 2, 0, LOPT_NO_NAMES },
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{ "enable-tftp", 2, 0, LOPT_TFTP },
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{ "tftp-secure", 0, 0, LOPT_SECURE },
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+ { "tftp-no-fail", 0, 0, LOPT_TFTP_NO_FAIL },
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{ "tftp-unique-root", 0, 0, LOPT_APREF },
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{ "tftp-root", 1, 0, LOPT_PREFIX },
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{ "tftp-max", 1, 0, LOPT_TFTP_MAX },
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@@ -402,6 +404,7 @@ static struct {
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{ LOPT_PREFIX, ARG_DUP, "<dir>[,<iface>]", gettext_noop("Export files by TFTP only from the specified subtree."), NULL },
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{ LOPT_APREF, OPT_TFTP_APREF, NULL, gettext_noop("Add client IP address to tftp-root."), NULL },
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{ LOPT_SECURE, OPT_TFTP_SECURE, NULL, gettext_noop("Allow access only to files owned by the user running dnsmasq."), NULL },
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+ { LOPT_TFTP_NO_FAIL, OPT_TFTP_NO_FAIL, NULL, gettext_noop("Do not terminate the service if TFTP directories are inaccessible."), NULL },
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{ LOPT_TFTP_MAX, ARG_ONE, "<integer>", gettext_noop("Maximum number of conncurrent TFTP transfers (defaults to %s)."), "#" },
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{ LOPT_NOBLOCK, OPT_TFTP_NOBLOCK, NULL, gettext_noop("Disable the TFTP blocksize extension."), NULL },
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{ LOPT_TFTP_LC, OPT_TFTP_LC, NULL, gettext_noop("Convert TFTP filenames to lowercase"), NULL },
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--
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2.1.4
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