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Fix the nfs related daemons so that they don't intermittently

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fail with "bind: address already in use". This problem was reported
to the freebsd-stable@ mailing list on Feb. 19 under the subject
heading "statd/lockd startup failure" by george+freebsd at m5p dot com.
The problem is that the first combination of {udp,tcp X ipv4,ipv6}
would select a port# dynamically, but one of the other three combinations
would have that port# already in use. The patch is somewhat involved
because it was requested by dougb@ that the four combinations use the
same port# wherever possible. The patch splits the create_service()
function into two functions. The first goes as far as bind(2) in a
loop for up to GETPORT_MAXTRY - 1 times, attempting to use the same port#
for all four cases. If these attempts fail, the last attempt allows
the 4 cases to use different port #s. After this function has succeeded,
the second function, called complete_service(), does the rest of what
create_service() did.
The three daemons mountd, rpc.lockd and rpc.statd all have a
create_service() function that is patched in a similar way. However,
create_service() has non-trivial differences for the three daemons
that made it impractical to share the same functions between them.

Reviewed by:	jhb
MFC after:	2 weeks
This commit is contained in:
Rick Macklem 2011-06-02 19:49:47 +00:00
parent 8fb6ad5d8a
commit 795b2dc06a
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=222624
1 changed files with 221 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

249
usr.sbin/rpc.lockd/lockd.c
View File

@ -74,6 +74,8 @@ __RCSID("$NetBSD: lockd.c,v 1.7 2000/08/12 18:08:44 thorpej Exp $");
#include "lockd.h"
#include <rpcsvc/nlm_prot.h>
#define GETPORT_MAXTRY 20 /* Max tries to get a port # */
int debug_level = 0; /* 0 = no debugging syslog() calls */
int _rpcsvcdirty = 0;
@ -84,13 +86,19 @@ int kernel_lockd_client;
pid_t client_pid;
struct mon mon_host;
char **hosts, *svcport_str = NULL;
static int mallocd_svcport = 0;
static int *sock_fd;
static int sock_fdcnt;
static int sock_fdpos;
int nhosts = 0;
int xcreated = 0;
char **addrs; /* actually (netid, uaddr) pairs */
int naddrs; /* count of how many (netid, uaddr) pairs */
char localhost[] = "localhost";
void create_service(struct netconfig *nconf);
static int create_service(struct netconfig *nconf);
static void complete_service(struct netconfig *nconf, char *port_str);
static void clearout_service(void);
void lookup_addresses(struct netconfig *nconf);
void init_nsm(void);
void nlm_prog_0(struct svc_req *, SVCXPRT *);
@ -119,6 +127,8 @@ main(int argc, char **argv)
int have_v6 = 1;
int maxrec = RPC_MAXDATASIZE;
in_port_t svcport = 0;
int attempt_cnt, port_len, port_pos, ret;
char **port_list;
while ((ch = getopt(argc, argv, "d:g:h:p:")) != (-1)) {
switch (ch) {
@ -309,6 +319,11 @@ main(int argc, char **argv)
}
endnetconfig(nc_handle);
} else {
attempt_cnt = 1;
sock_fdcnt = 0;
sock_fd = NULL;
port_list = NULL;
port_len = 0;
nc_handle = setnetconfig();
while ((nconf = getnetconfig(nc_handle))) {
/* We want to listen only on udp6, tcp6, udp, tcp transports */
@ -317,11 +332,96 @@ main(int argc, char **argv)
if (have_v6 == 0 && strcmp(nconf->nc_protofmly, "inet6") == 0) {
/* DO NOTHING */
} else {
create_service(nconf);
ret = create_service(nconf);
if (ret == 1)
/* Ignore this call */
continue;
if (ret < 0) {
/*
* Failed to bind port, so close
* off all sockets created and
* try again if the port# was
* dynamically assigned via
* bind(2).
*/
clearout_service();
if (mallocd_svcport != 0 &&
attempt_cnt <
GETPORT_MAXTRY) {
free(svcport_str);
svcport_str = NULL;
mallocd_svcport = 0;
} else {
errno = EADDRINUSE;
syslog(LOG_ERR,
"bindresvport_sa: %m");
exit(1);
}
/*
* Start over at the first
* service.
*/
free(sock_fd);
sock_fdcnt = 0;
sock_fd = NULL;
nc_handle = setnetconfig();
attempt_cnt++;
} else if (mallocd_svcport != 0 &&
attempt_cnt == GETPORT_MAXTRY) {
/*
* For the last attempt, allow
* different port #s for each
* nconf by saving the
* svcport_str and setting it
* back to NULL.
*/
port_list = realloc(port_list,
(port_len + 1) *
sizeof(char *));
if (port_list == NULL)
out_of_mem();
port_list[port_len++] =
svcport_str;
svcport_str = NULL;
mallocd_svcport = 0;
}
}
}
}
/*
* Successfully bound the ports, so call complete_service() to
* do the rest of the setup on the service(s).
*/
sock_fdpos = 0;
port_pos = 0;
nc_handle = setnetconfig();
while ((nconf = getnetconfig(nc_handle))) {
/* We want to listen only on udp6, tcp6, udp, tcp transports */
if (nconf->nc_flag & NC_VISIBLE) {
/* Skip if there's no IPv6 support */
if (have_v6 == 0 && strcmp(nconf->nc_protofmly, "inet6") == 0) {
/* DO NOTHING */
} else if (port_list != NULL) {
if (port_pos >= port_len) {
syslog(LOG_ERR,
"too many port#s");
exit(1);
}
complete_service(nconf,
port_list[port_pos++]);
} else
complete_service(nconf, svcport_str);
}
}
endnetconfig(nc_handle);
free(sock_fd);
if (port_list != NULL) {
for (port_pos = 0; port_pos < port_len; port_pos++)
free(port_list[port_pos]);
free(port_list);
}
}
/*
@ -386,29 +486,30 @@ main(int argc, char **argv)
/*
* This routine creates and binds sockets on the appropriate
* addresses. It gets called one time for each transport and
* registrates the service with rpcbind on that trasport.
* addresses. It gets called one time for each transport.
* It returns 0 upon success, 1 for ingore the call and -1 to indicate
* bind failed with EADDRINUSE.
* Any file descriptors that have been created are stored in sock_fd and
* the total count of them is maintained in sock_fdcnt.
*/
void
static int
create_service(struct netconfig *nconf)
{
struct addrinfo hints, *res = NULL;
struct sockaddr_in *sin;
struct sockaddr_in6 *sin6;
struct __rpc_sockinfo si;
struct netbuf servaddr;
SVCXPRT *transp = NULL;
int aicode;
int fd;
int nhostsbak;
int r;
int registered = 0;
u_int32_t host_addr[4]; /* IPv4 or IPv6 */
int mallocd_res;
if ((nconf->nc_semantics != NC_TPI_CLTS) &&
(nconf->nc_semantics != NC_TPI_COTS) &&
(nconf->nc_semantics != NC_TPI_COTS_ORD))
return; /* not my type */
return (1); /* not my type */
/*
* XXX - using RPC library internal functions.
@ -416,7 +517,7 @@ create_service(struct netconfig *nconf)
if (!__rpc_nconf2sockinfo(nconf, &si)) {
syslog(LOG_ERR, "cannot get information for %s",
nconf->nc_netid);
return;
return (1);
}
/* Get rpc.statd's address on this transport */
@ -432,6 +533,11 @@ create_service(struct netconfig *nconf)
nhostsbak = nhosts;
while (nhostsbak > 0) {
--nhostsbak;
sock_fd = realloc(sock_fd, (sock_fdcnt + 1) * sizeof(int));
if (sock_fd == NULL)
out_of_mem();
sock_fd[sock_fdcnt++] = -1; /* Set invalid for now. */
mallocd_res = 0;
/*
* XXX - using RPC library internal functions.
@ -446,7 +552,7 @@ create_service(struct netconfig *nconf)
case AF_INET:
if (inet_pton(AF_INET, hosts[nhostsbak],
host_addr) == 1) {
hints.ai_flags &= AI_NUMERICHOST;
hints.ai_flags |= AI_NUMERICHOST;
} else {
/*
* Skip if we have an AF_INET6 address.
@ -461,7 +567,7 @@ create_service(struct netconfig *nconf)
case AF_INET6:
if (inet_pton(AF_INET6, hosts[nhostsbak],
host_addr) == 1) {
hints.ai_flags &= AI_NUMERICHOST;
hints.ai_flags |= AI_NUMERICHOST;
} else {
/*
* Skip if we have an AF_INET address.
@ -485,6 +591,7 @@ create_service(struct netconfig *nconf)
res = malloc(sizeof(struct addrinfo));
if (res == NULL)
out_of_mem();
mallocd_res = 1;
res->ai_flags = hints.ai_flags;
res->ai_family = hints.ai_family;
res->ai_protocol = hints.ai_protocol;
@ -498,7 +605,7 @@ create_service(struct netconfig *nconf)
sin->sin_addr.s_addr = htonl(INADDR_ANY);
res->ai_addr = (struct sockaddr*) sin;
res->ai_addrlen = (socklen_t)
sizeof(res->ai_addr);
sizeof(struct sockaddr_in);
break;
case AF_INET6:
sin6 = malloc(sizeof(struct sockaddr_in6));
@ -508,10 +615,14 @@ create_service(struct netconfig *nconf)
sin6->sin6_port = htons(0);
sin6->sin6_addr = in6addr_any;
res->ai_addr = (struct sockaddr*) sin6;
res->ai_addrlen = (socklen_t) sizeof(res->ai_addr);
res->ai_addrlen = (socklen_t)
sizeof(struct sockaddr_in6);
break;
default:
break;
syslog(LOG_ERR,
"bad addr fam %d",
res->ai_family);
exit(1);
}
} else {
if ((aicode = getaddrinfo(NULL, svcport_str,
@ -520,6 +631,7 @@ create_service(struct netconfig *nconf)
"cannot get local address for %s: %s",
nconf->nc_netid,
gai_strerror(aicode));
close(fd);
continue;
}
}
@ -529,16 +641,92 @@ create_service(struct netconfig *nconf)
syslog(LOG_ERR,
"cannot get local address for %s: %s",
nconf->nc_netid, gai_strerror(aicode));
close(fd);
continue;
}
}
/* Store the fd. */
sock_fd[sock_fdcnt - 1] = fd;
/* Now, attempt the bind. */
r = bindresvport_sa(fd, res->ai_addr);
if (r != 0) {
if (errno == EADDRINUSE && mallocd_svcport != 0) {
if (mallocd_res != 0) {
free(res->ai_addr);
free(res);
} else
freeaddrinfo(res);
return (-1);
}
syslog(LOG_ERR, "bindresvport_sa: %m");
exit(1);
}
if (svcport_str == NULL) {
svcport_str = malloc(NI_MAXSERV * sizeof(char));
if (svcport_str == NULL)
out_of_mem();
mallocd_svcport = 1;
if (getnameinfo(res->ai_addr,
res->ai_addr->sa_len, NULL, NI_MAXHOST,
svcport_str, NI_MAXSERV * sizeof(char),
NI_NUMERICHOST | NI_NUMERICSERV))
errx(1, "Cannot get port number");
}
if (mallocd_res != 0) {
free(res->ai_addr);
free(res);
} else
freeaddrinfo(res);
res = NULL;
}
return (0);
}
/*
* Called after all the create_service() calls have succeeded, to complete
* the setup and registration.
*/
static void
complete_service(struct netconfig *nconf, char *port_str)
{
struct addrinfo hints, *res = NULL;
struct __rpc_sockinfo si;
struct netbuf servaddr;
SVCXPRT *transp = NULL;
int aicode, fd, nhostsbak;
int registered = 0;
if ((nconf->nc_semantics != NC_TPI_CLTS) &&
(nconf->nc_semantics != NC_TPI_COTS) &&
(nconf->nc_semantics != NC_TPI_COTS_ORD))
return; /* not my type */
/*
* XXX - using RPC library internal functions.
*/
if (!__rpc_nconf2sockinfo(nconf, &si)) {
syslog(LOG_ERR, "cannot get information for %s",
nconf->nc_netid);
return;
}
nhostsbak = nhosts;
while (nhostsbak > 0) {
--nhostsbak;
if (sock_fdpos >= sock_fdcnt) {
/* Should never happen. */
syslog(LOG_ERR, "Ran out of socket fd's");
return;
}
fd = sock_fd[sock_fdpos++];
if (fd < 0)
continue;
if (nconf->nc_semantics != NC_TPI_CLTS)
listen(fd, SOMAXCONN);
@ -582,19 +770,7 @@ create_service(struct netconfig *nconf)
hints.ai_socktype = si.si_socktype;
hints.ai_protocol = si.si_proto;
if (svcport_str == NULL) {
svcport_str = malloc(NI_MAXSERV * sizeof(char));
if (svcport_str == NULL)
out_of_mem();
if (getnameinfo(res->ai_addr,
res->ai_addr->sa_len, NULL, NI_MAXHOST,
svcport_str, NI_MAXSERV * sizeof(char),
NI_NUMERICHOST | NI_NUMERICSERV))
errx(1, "Cannot get port number");
}
if((aicode = getaddrinfo(NULL, svcport_str, &hints,
if ((aicode = getaddrinfo(NULL, port_str, &hints,
&res)) != 0) {
syslog(LOG_ERR, "cannot get local address: %s",
gai_strerror(aicode));
@ -616,6 +792,23 @@ create_service(struct netconfig *nconf)
} /* end while */
}
/*
* Clear out sockets after a failure to bind one of them, so that the
* cycle of socket creation/binding can start anew.
*/
static void
clearout_service(void)
{
int i;
for (i = 0; i < sock_fdcnt; i++) {
if (sock_fd[i] >= 0) {
shutdown(sock_fd[i], SHUT_RDWR);
close(sock_fd[i]);
}
}
}
/*
* Look up addresses for the kernel to create transports for.
*/