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30 Commits

Author SHA1 Message Date
Nicholas J. Kain
2420bed259 Accept no command line arguments without error. 2014-04-21 12:04:13 -04:00
Nicholas J. Kain
dbc91b0811 Background option in config files should be a boolval rathe than a value. 2014-04-21 09:02:58 -04:00
Nicholas J. Kain
034e2bb1db When sockd transfers a file descriptor to ndhc, close the fd in sockd. 
Since the transfer is conceptually a move, this is the correct thing to
do and prevents sockets from spuriously hanging around forever and
eventually exhausting the per process limit on fds.
 2014-04-17 11:04:00 -04:00
Nicholas J. Kain
07cbd88049 Just use raw sockets for listening to DHCP requests. A UDP SO_BROADCAST 
socket was previously used only for receiving RENEWING packets, and it
added needless complexity and was somewhat fragile.
 2014-04-16 01:00:36 -04:00
Nicholas J. Kain
ca85a6ba9f Style cleanups in dhcp.c. 2014-04-16 00:24:40 -04:00
Nicholas J. Kain
d8260b4e63 Print an error message when bind() fails when creating a UDP socket in sockd. 2014-04-16 00:24:13 -04:00
Nicholas J. Kain
0884d96d1e PR_SET_PDEATHSIG is not fully reliable, so instead maintain a pair of 
AF_UNIX SOCK_STREAM sockets between the master processes and each subprocess,
and poll for the HUP event.

At the same time, be specific about the events that are checked in epoll
when dispatching on an event.
 2014-04-15 23:19:24 -04:00
Nicholas J. Kain
e526adce19 Make the signal handling code use safe_read() and unify ifchd and sockd 
signals code.
 2014-04-15 20:55:13 -04:00
Nicholas J. Kain
baa394af9a UDP listen sockets should be requested with 'U' instead of 'u'. 2014-04-15 20:54:35 -04:00
Nicholas J. Kain
b00444ab8b Bound the subprocess lifetime using prctl(PR_SET_PDEATHSIG, ...). 
The pipes wouldn't do this job anymore because they were unused and thus
never performed writes that would generate SIGPIPEs, so the pipes are
removed, too.
 2014-04-15 18:01:01 -04:00
Nicholas J. Kain
b3ce601f20 state.c: Print error messages if we fail to send DHCP packets. 2014-04-15 17:59:15 -04:00
Nicholas J. Kain
18604c5245 get_udp_unicast_socket() needs to have the client address as an argument 
when sending the request to sockd.

Also, print error messages if sockd returns an invalid fd (< 0).
 2014-04-15 17:55:28 -04:00
Nicholas J. Kain
a9055b5ca5 Update more message prints to prefix with the interface name. 2014-04-15 15:24:22 -04:00
Nicholas J. Kain
58b4ba768c If the IP header length does not match the size of the UDP packet received 
via the raw socket, print both lengths in the warning message.
 2014-04-15 15:23:52 -04:00
Nicholas J. Kain
730e5ef310 setpgid() can return EPERM if we are already a process group leader. 2014-04-15 15:02:20 -04:00
Nicholas J. Kain
e5834da6d3 Permit sendmsg in the seccomp syscall whitelist for all daemons. 2014-04-15 14:57:07 -04:00
Nicholas J. Kain
b5f0ccd88d In cfg.rl, when performing clear action, don't clear the cs member in ccfg. 2014-04-15 14:56:35 -04:00
Nicholas J. Kain
a777766cc6 Fix stupid typo in ndhc.c that would cause the clientid option to 
corrupt the start of the hostname option if both were specified.
 2014-04-15 14:55:50 -04:00
Nicholas J. Kain
74ad01a086 Update the manual page. 2014-04-14 15:52:39 -04:00
Nicholas J. Kain
a501789e04 Parse config options with ragel and support a configuration file. 2014-04-14 15:06:31 -04:00
Nicholas J. Kain
d267c2c44b Use the raw capability interface via updated ncmlib rather than linking 
to libcap.
 2014-04-07 15:05:34 -04:00
Nicholas J. Kain
bb1ff7a506 arp.c: Make logging messages print the associated interface name. 2014-04-07 04:43:21 -04:00
Nicholas J. Kain
74678ef510 Use safe_recvmsg(). 2014-04-07 04:22:32 -04:00
Nicholas J. Kain
6804be2277 Use safe_sendto where necessary, and check for short writes. 
Also, change many log_lines to log_errors, mostly in ifset.c.
 2014-04-07 04:15:02 -04:00
Nicholas J. Kain
650da6a7fd Add recvfrom to the seccomp syscall whitelist. 2014-04-07 03:54:30 -04:00
Nicholas J. Kain
cab9162d8d Remove socketpair from the seccomp syscall filter whitelist. 
socketpair() is called only before privileges are dropped, so it does
not need to be in the whitelist.
 2014-04-07 03:44:53 -04:00
Nicholas J. Kain
5fa2030bab Use a socketpair rather than a pair of pipes for communication between 
ndhc and ifch, similar to sockd.  A single pipe is also maintained so
that SIGPIPE can bound the lifetime of an orphaned ifch process.
 2014-04-07 03:44:02 -04:00
Nicholas J. Kain
e2ee728982 Consolidate all of the global static variables in arp.c into a single 
struct, and use booleans where appropriate.
 2014-04-06 22:12:31 -04:00
Nicholas J. Kain
a86363f248 Create a new process ID group for ndhc. 2014-04-06 22:07:12 -04:00
Nicholas J. Kain
b761889025 Move source from ndhc/ to src/ since ifchd is no longer a separate program. 2014-04-06 16:57:06 -04:00