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nwfilter: make ignoring non-zero status easier to follow

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While auditing all callers of virCommandRun, I noticed that nwfilter
code never paid attention to commands with a non-zero status; they
were merely passing a pointer to avoid spamming the logs with a
message about commands that might indeed fail.  But proving this
required chasing through a lot of code; refactoring things to
localize the decision of whether to ignore non-zero status makes
it easier to prove that later changes to virFork don't negatively
affect this code.

While at it, I also noticed that ebiptablesRemoveRules would
actually report success if the child process failed for a
reason other than non-zero status, such as OOM.

* src/nwfilter/nwfilter_ebiptables_driver.c (ebiptablesExecCLI):
Change parameter from pointer to bool.
(ebtablesApplyBasicRules, ebtablesApplyDHCPOnlyRules)
(ebtablesApplyDropAllRules, ebtablesCleanAll)
(ebiptablesApplyNewRules, ebiptablesTearNewRules)
(ebiptablesTearOldRules, ebiptablesAllTeardown)
(ebiptablesDriverInitWithFirewallD)
(ebiptablesDriverTestCLITools, ebiptablesDriverProbeStateMatch):
Adjust all clients.
(ebiptablesRemoveRules): Likewise, and fix return value on failure.

Signed-off-by: Eric Blake <eblake@redhat.com>
This commit is contained in:
Eric Blake 2014-02-19 16:45:54 -07:00
parent 72bddd5f2f
commit f972a7c72c
1 changed files with 41 additions and 58 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

99
src/nwfilter/nwfilter_ebiptables_driver.c
View File

@ -1,7 +1,7 @@
/*
* nwfilter_ebiptables_driver.c: driver for ebtables/iptables on tap devices
*
* Copyright (C) 2011-2013 Red Hat, Inc.
* Copyright (C) 2011-2014 Red Hat, Inc.
* Copyright (C) 2010-2012 IBM Corp.
* Copyright (C) 2010-2012 Stefan Berger
*
@ -2797,10 +2797,9 @@ ebiptablesDisplayRuleInstance(void *_inst)
/**
* ebiptablesExecCLI:
* @buf : pointer to virBuffer containing the string with the commands to
* execute.
* @status: Pointer to an integer for returning the WEXITSTATUS of the
* commands executed via the script the was run.
* @buf: pointer to virBuffer containing the string with the commands to
* execute.
* @ignoreNonzero: true if non-zero status is not fatal
* @outbuf: Optional pointer to a string that will hold the buffer with
* output of the executed command. The actual buffer holding
* the message will be newly allocated by this function and
@ -2811,18 +2810,15 @@ ebiptablesDisplayRuleInstance(void *_inst)
* script.
*
* Execute a sequence of commands (held in the given buffer) as a /bin/sh
* script and return the status of the execution in *status (if status is
* NULL, then the script must exit with status 0).
* script. Depending on ignoreNonzero, this function will fail if the
* script has unexpected status.
*/
static int
ebiptablesExecCLI(virBufferPtr buf,
int *status, char **outbuf)
ebiptablesExecCLI(virBufferPtr buf, bool ignoreNonzero, char **outbuf)
{
int rc = -1;
virCommandPtr cmd;
if (status)
*status = 0;
int status;
if (!virBufferError(buf) && !virBufferUse(buf))
return 0;
@ -2837,7 +2833,7 @@ ebiptablesExecCLI(virBufferPtr buf,
virMutexLock(&execCLIMutex);
rc = virCommandRun(cmd, status);
rc = virCommandRun(cmd, ignoreNonzero ? &status : NULL);
virMutexUnlock(&execCLIMutex);
@ -3293,7 +3289,7 @@ ebtablesApplyBasicRules(const char *ifname,
ebtablesLinkTmpRootChain(&buf, 1, ifname, 1);
ebtablesRenameTmpRootChain(&buf, 1, ifname);
if (ebiptablesExecCLI(&buf, NULL, NULL) < 0)
if (ebiptablesExecCLI(&buf, false, NULL) < 0)
goto tear_down_tmpebchains;
return 0;
@ -3441,7 +3437,7 @@ ebtablesApplyDHCPOnlyRules(const char *ifname,
ebtablesRenameTmpRootChain(&buf, 0, ifname);
}
if (ebiptablesExecCLI(&buf, NULL, NULL) < 0)
if (ebiptablesExecCLI(&buf, false, NULL) < 0)
goto tear_down_tmpebchains;
return 0;
@ -3511,7 +3507,7 @@ ebtablesApplyDropAllRules(const char *ifname)
ebtablesRenameTmpRootChain(&buf, 1, ifname);
ebtablesRenameTmpRootChain(&buf, 0, ifname);
if (ebiptablesExecCLI(&buf, NULL, NULL) < 0)
if (ebiptablesExecCLI(&buf, false, NULL) < 0)
goto tear_down_tmpebchains;
return 0;
@ -3537,7 +3533,6 @@ ebtablesRemoveBasicRules(const char *ifname)
static int ebtablesCleanAll(const char *ifname)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
int cli_status;
if (!ebtables_cmd_path)
return 0;
@ -3556,7 +3551,7 @@ static int ebtablesCleanAll(const char *ifname)
ebtablesRemoveTmpRootChain(&buf, 1, ifname);
ebtablesRemoveTmpRootChain(&buf, 0, ifname);
ebiptablesExecCLI(&buf, &cli_status, NULL);
ebiptablesExecCLI(&buf, true, NULL);
return 0;
}
@ -3704,7 +3699,6 @@ ebiptablesApplyNewRules(const char *ifname,
void **_inst)
{
size_t i, j;
int cli_status;
ebiptablesRuleInstPtr *inst = (ebiptablesRuleInstPtr *)_inst;
virBuffer buf = VIR_BUFFER_INITIALIZER;
virHashTablePtr chains_in_set = virHashCreate(10, NULL);
@ -3752,7 +3746,7 @@ ebiptablesApplyNewRules(const char *ifname,
ebtablesRemoveTmpSubChains(&buf, ifname);
ebtablesRemoveTmpRootChain(&buf, 1, ifname);
ebtablesRemoveTmpRootChain(&buf, 0, ifname);
ebiptablesExecCLI(&buf, &cli_status, NULL);
ebiptablesExecCLI(&buf, true, NULL);
}
NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
@ -3771,7 +3765,7 @@ ebiptablesApplyNewRules(const char *ifname,
qsort(&ebtChains[0], nEbtChains, sizeof(ebtChains[0]),
ebiptablesRuleOrderSort);
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0)
goto tear_down_tmpebchains;
NWFILTER_SET_EBTABLES_SHELLVAR(&buf);
@ -3807,7 +3801,7 @@ ebiptablesApplyNewRules(const char *ifname,
ebtChains[j++].commandTemplate,
'A', -1, 1);
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0)
goto tear_down_tmpebchains;
if (haveIptables) {
@ -3818,21 +3812,21 @@ ebiptablesApplyNewRules(const char *ifname,
iptablesCreateBaseChains(&buf);
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0)
goto tear_down_tmpebchains;
NWFILTER_SET_IPTABLES_SHELLVAR(&buf);
iptablesCreateTmpRootChains(&buf, ifname);
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0)
goto tear_down_tmpiptchains;
NWFILTER_SET_IPTABLES_SHELLVAR(&buf);
iptablesLinkTmpRootChains(&buf, ifname);
iptablesSetupVirtInPost(&buf, ifname);
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0)
goto tear_down_tmpiptchains;
NWFILTER_SET_IPTABLES_SHELLVAR(&buf);
@ -3845,7 +3839,7 @@ ebiptablesApplyNewRules(const char *ifname,
'A', -1, 1);
}
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0)
goto tear_down_tmpiptchains;
iptablesCheckBridgeNFCallEnabled(false);
@ -3859,21 +3853,21 @@ ebiptablesApplyNewRules(const char *ifname,
iptablesCreateBaseChains(&buf);
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0)
goto tear_down_tmpiptchains;
NWFILTER_SET_IP6TABLES_SHELLVAR(&buf);
iptablesCreateTmpRootChains(&buf, ifname);
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0)
goto tear_down_tmpip6tchains;
NWFILTER_SET_IP6TABLES_SHELLVAR(&buf);
iptablesLinkTmpRootChains(&buf, ifname);
iptablesSetupVirtInPost(&buf, ifname);
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0)
goto tear_down_tmpip6tchains;
NWFILTER_SET_IP6TABLES_SHELLVAR(&buf);
@ -3885,7 +3879,7 @@ ebiptablesApplyNewRules(const char *ifname,
'A', -1, 1);
}
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0)
goto tear_down_tmpip6tchains;
iptablesCheckBridgeNFCallEnabled(true);
@ -3898,7 +3892,7 @@ ebiptablesApplyNewRules(const char *ifname,
if (virHashSize(chains_out_set) != 0)
ebtablesLinkTmpRootChain(&buf, 0, ifname, 1);
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0)
goto tear_down_ebsubchains_and_unlink;
virHashFree(chains_in_set);
@ -3945,7 +3939,7 @@ tear_down_tmpebchains:
ebtablesRemoveTmpRootChain(&buf, 0, ifname);
}
ebiptablesExecCLI(&buf, &cli_status, NULL);
ebiptablesExecCLI(&buf, true, NULL);
virReportError(VIR_ERR_BUILD_FIREWALL,
_("Some rules could not be created for "
@ -3971,7 +3965,6 @@ exit_free_sets:
static int
ebiptablesTearNewRules(const char *ifname)
{
int cli_status;
virBuffer buf = VIR_BUFFER_INITIALIZER;
if (iptables_cmd_path) {
@ -3999,7 +3992,7 @@ ebiptablesTearNewRules(const char *ifname)
ebtablesRemoveTmpRootChain(&buf, 0, ifname);
}
ebiptablesExecCLI(&buf, &cli_status, NULL);
ebiptablesExecCLI(&buf, true, NULL);
return 0;
}
@ -4008,7 +4001,6 @@ ebiptablesTearNewRules(const char *ifname)
static int
ebiptablesTearOldRules(const char *ifname)
{
int cli_status;
virBuffer buf = VIR_BUFFER_INITIALIZER;
/* switch to new iptables user defined chains */
@ -4019,7 +4011,7 @@ ebiptablesTearOldRules(const char *ifname)
iptablesRemoveRootChains(&buf, ifname);
iptablesRenameTmpRootChains(&buf, ifname);
ebiptablesExecCLI(&buf, &cli_status, NULL);
ebiptablesExecCLI(&buf, true, NULL);
}
if (ip6tables_cmd_path) {
@ -4029,7 +4021,7 @@ ebiptablesTearOldRules(const char *ifname)
iptablesRemoveRootChains(&buf, ifname);
iptablesRenameTmpRootChains(&buf, ifname);
ebiptablesExecCLI(&buf, &cli_status, NULL);
ebiptablesExecCLI(&buf, true, NULL);
}
if (ebtables_cmd_path) {
@ -4045,7 +4037,7 @@ ebiptablesTearOldRules(const char *ifname)
ebtablesRenameTmpSubAndRootChains(&buf, ifname);
ebiptablesExecCLI(&buf, &cli_status, NULL);
ebiptablesExecCLI(&buf, true, NULL);
}
return 0;
@ -4068,8 +4060,7 @@ ebiptablesRemoveRules(const char *ifname ATTRIBUTE_UNUSED,
int nruleInstances,
void **_inst)
{
int rc = 0;
int cli_status;
int rc = -1;
size_t i;
virBuffer buf = VIR_BUFFER_INITIALIZER;
ebiptablesRuleInstPtr *inst = (ebiptablesRuleInstPtr *)_inst;
@ -4082,17 +4073,12 @@ ebiptablesRemoveRules(const char *ifname ATTRIBUTE_UNUSED,
'D', -1,
0);
if (ebiptablesExecCLI(&buf, &cli_status, NULL) < 0)
goto err_exit;
if (ebiptablesExecCLI(&buf, true, NULL) < 0)
goto cleanup;
if (cli_status) {
virReportError(VIR_ERR_BUILD_FIREWALL,
"%s",
_("error while executing CLI commands"));
rc = -1;
}
rc = 0;
err_exit:
cleanup:
return rc;
}
@ -4110,7 +4096,6 @@ static int
ebiptablesAllTeardown(const char *ifname)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
int cli_status;
if (iptables_cmd_path) {
NWFILTER_SET_IPTABLES_SHELLVAR(&buf);
@ -4139,7 +4124,7 @@ ebiptablesAllTeardown(const char *ifname)
ebtablesRemoveRootChain(&buf, 1, ifname);
ebtablesRemoveRootChain(&buf, 0, ifname);
}
ebiptablesExecCLI(&buf, &cli_status, NULL);
ebiptablesExecCLI(&buf, true, NULL);
return 0;
}
@ -4180,7 +4165,6 @@ ebiptablesDriverInitWithFirewallD(void)
virBuffer buf = VIR_BUFFER_INITIALIZER;
char *firewall_cmd_path;
char *output = NULL;
int status;
int ret = -1;
if (!virNWFilterDriverIsWatchingFirewallD())
@ -4196,8 +4180,7 @@ ebiptablesDriverInitWithFirewallD(void)
"%s",
CMD_STOPONERR(1));
if (ebiptablesExecCLI(&buf, &status, &output) < 0 ||
status != 0) {
if (ebiptablesExecCLI(&buf, false, &output) < 0) {
VIR_INFO("firewalld support disabled for nwfilter");
} else {
VIR_INFO("firewalld support enabled for nwfilter");
@ -4268,7 +4251,7 @@ ebiptablesDriverTestCLITools(void)
"%s",
CMD_STOPONERR(1));
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0) {
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0) {
VIR_FREE(ebtables_cmd_path);
VIR_ERROR(_("Testing of ebtables command failed: %s"),
errmsg);
@ -4285,7 +4268,7 @@ ebiptablesDriverTestCLITools(void)
"%s",
CMD_STOPONERR(1));
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0) {
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0) {
VIR_FREE(iptables_cmd_path);
VIR_ERROR(_("Testing of iptables command failed: %s"),
errmsg);
@ -4302,7 +4285,7 @@ ebiptablesDriverTestCLITools(void)
"%s",
CMD_STOPONERR(1));
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0) {
if (ebiptablesExecCLI(&buf, false, &errmsg) < 0) {
VIR_FREE(ip6tables_cmd_path);
VIR_ERROR(_("Testing of ip6tables command failed: %s"),
errmsg);
@ -4353,7 +4336,7 @@ ebiptablesDriverProbeStateMatch(void)
virBufferAsprintf(&buf,
"$IPT --version");
if (ebiptablesExecCLI(&buf, NULL, &cmdout) < 0) {
if (ebiptablesExecCLI(&buf, false, &cmdout) < 0) {
VIR_ERROR(_("Testing of iptables command failed: %s"),
cmdout);
return;