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Improve error reporting of failures to apply filtering rules

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Display the executed command and failure message if a command failed to
execute.

Signed-off-by: Stefan Berger <stefanb@linux.vnet.ibm.com>
This commit is contained in:
Stefan Berger 2011-11-22 15:12:04 -05:00 committed by Stefan Berger
parent d64208888d
commit fa69eb5f52
1 changed files with 50 additions and 36 deletions
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86
src/nwfilter/nwfilter_ebiptables_driver.c
View File

@ -65,10 +65,10 @@
#define CMD_DEF_PRE "cmd='"
#define CMD_DEF_POST "'"
#define CMD_DEF(X) CMD_DEF_PRE X CMD_DEF_POST
#define CMD_EXEC "eval res=\\$\\(\"${cmd}\"\\)" CMD_SEPARATOR
#define CMD_EXEC "eval res=\\$\\(\"${cmd} 2>&1\"\\)" CMD_SEPARATOR
#define CMD_STOPONERR(X) \
X ? "if [ $? -ne 0 ]; then" \
" echo \"Failure to execute command '${cmd}'.\";" \
" echo \"Failure to execute command '${cmd}' : '${res}'.\";" \
" exit 1;" \
"fi" CMD_SEPARATOR \
: ""
@ -2710,6 +2710,10 @@ ebiptablesDisplayRuleInstance(virConnectPtr conn ATTRIBUTE_UNUSED,
* execute.
* @status: Pointer to an integer for returning the WEXITSTATUS of the
* commands executed via the script the was run.
* @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
* any passed in buffer freed first.
*
* Returns 0 in case of success, < 0 in case of an error. The returned
* value is NOT the result of running the commands inside the shell
@ -2721,17 +2725,24 @@ ebiptablesDisplayRuleInstance(virConnectPtr conn ATTRIBUTE_UNUSED,
*/
static int
ebiptablesExecCLI(virBufferPtr buf,
int *status)
int *status, char **outbuf)
{
int rc = -1;
virCommandPtr cmd;
*status = 0;
if (status)
*status = 0;
if (!virBufferError(buf) && !virBufferUse(buf))
return 0;
if (outbuf)
VIR_FREE(*outbuf);
cmd = virCommandNewArgList("/bin/sh", "-c", NULL);
virCommandAddArgBuffer(cmd, buf);
if (outbuf)
virCommandSetOutputBuffer(cmd, outbuf);
virMutexLock(&execCLIMutex);
@ -3142,7 +3153,6 @@ ebtablesApplyBasicRules(const char *ifname,
const unsigned char *macaddr)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
int cli_status;
char chain[MAX_CHAINNAME_LENGTH];
char chainPrefix = CHAINPREFIX_HOST_IN_TEMP;
char macaddr_str[VIR_MAC_STRING_BUFLEN];
@ -3197,7 +3207,7 @@ ebtablesApplyBasicRules(const char *ifname,
ebtablesLinkTmpRootChain(&buf, 1, ifname, 1);
ebtablesRenameTmpRootChain(&buf, 1, ifname);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, NULL) < 0)
goto tear_down_tmpebchains;
return 0;
@ -3233,7 +3243,6 @@ ebtablesApplyDHCPOnlyRules(const char *ifname,
const char *dhcpserver)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
int cli_status;
char chain_in [MAX_CHAINNAME_LENGTH],
chain_out[MAX_CHAINNAME_LENGTH];
char macaddr_str[VIR_MAC_STRING_BUFLEN];
@ -3313,7 +3322,7 @@ ebtablesApplyDHCPOnlyRules(const char *ifname,
ebtablesRenameTmpRootChain(&buf, 1, ifname);
ebtablesRenameTmpRootChain(&buf, 0, ifname);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, NULL) < 0)
goto tear_down_tmpebchains;
VIR_FREE(srcIPParam);
@ -3346,7 +3355,6 @@ static int
ebtablesApplyDropAllRules(const char *ifname)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
int cli_status;
char chain_in [MAX_CHAINNAME_LENGTH],
chain_out[MAX_CHAINNAME_LENGTH];
@ -3386,7 +3394,7 @@ ebtablesApplyDropAllRules(const char *ifname)
ebtablesRenameTmpRootChain(&buf, 1, ifname);
ebtablesRenameTmpRootChain(&buf, 0, ifname);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, NULL) < 0)
goto tear_down_tmpebchains;
return 0;
@ -3429,7 +3437,7 @@ static int ebtablesCleanAll(const char *ifname)
ebtablesRemoveTmpRootChain(&buf, 1, ifname);
ebtablesRemoveTmpRootChain(&buf, 0, ifname);
ebiptablesExecCLI(&buf, &cli_status);
ebiptablesExecCLI(&buf, &cli_status, NULL);
return 0;
}
@ -3586,6 +3594,7 @@ ebiptablesApplyNewRules(virConnectPtr conn ATTRIBUTE_UNUSED,
bool haveIp6tables = false;
ebiptablesRuleInstPtr ebtChains = NULL;
int nEbtChains = 0;
char *errmsg = NULL;
if (!chains_in_set || !chains_out_set) {
virReportOOMError();
@ -3624,7 +3633,7 @@ ebiptablesApplyNewRules(virConnectPtr conn ATTRIBUTE_UNUSED,
ebtablesRemoveTmpSubChains(&buf, ifname);
ebtablesRemoveTmpRootChain(&buf, 1, ifname);
ebtablesRemoveTmpRootChain(&buf, 0, ifname);
ebiptablesExecCLI(&buf, &cli_status);
ebiptablesExecCLI(&buf, &cli_status, NULL);
}
/* create needed chains */
@ -3639,7 +3648,7 @@ ebiptablesApplyNewRules(virConnectPtr conn ATTRIBUTE_UNUSED,
qsort(&ebtChains[0], nEbtChains, sizeof(ebtChains[0]),
ebiptablesRuleOrderSort);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
goto tear_down_tmpebchains;
/* process ebtables commands; interleave commands from filters with
@ -3673,7 +3682,7 @@ ebiptablesApplyNewRules(virConnectPtr conn ATTRIBUTE_UNUSED,
ebtChains[j++].commandTemplate,
'A', -1, 1);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
goto tear_down_tmpebchains;
if (haveIptables) {
@ -3682,17 +3691,17 @@ ebiptablesApplyNewRules(virConnectPtr conn ATTRIBUTE_UNUSED,
iptablesCreateBaseChains(iptables_cmd_path, &buf);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
goto tear_down_tmpebchains;
iptablesCreateTmpRootChains(iptables_cmd_path, &buf, ifname);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
goto tear_down_tmpiptchains;
iptablesLinkTmpRootChains(iptables_cmd_path, &buf, ifname);
iptablesSetupVirtInPost(iptables_cmd_path, &buf, ifname);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
goto tear_down_tmpiptchains;
for (i = 0; i < nruleInstances; i++) {
@ -3703,7 +3712,7 @@ ebiptablesApplyNewRules(virConnectPtr conn ATTRIBUTE_UNUSED,
'A', -1, 1);
}
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
goto tear_down_tmpiptchains;
iptablesCheckBridgeNFCallEnabled(false);
@ -3715,17 +3724,17 @@ ebiptablesApplyNewRules(virConnectPtr conn ATTRIBUTE_UNUSED,
iptablesCreateBaseChains(ip6tables_cmd_path, &buf);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
goto tear_down_tmpiptchains;
iptablesCreateTmpRootChains(ip6tables_cmd_path, &buf, ifname);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
goto tear_down_tmpip6tchains;
iptablesLinkTmpRootChains(ip6tables_cmd_path, &buf, ifname);
iptablesSetupVirtInPost(ip6tables_cmd_path, &buf, ifname);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
goto tear_down_tmpip6tchains;
for (i = 0; i < nruleInstances; i++) {
@ -3735,7 +3744,7 @@ ebiptablesApplyNewRules(virConnectPtr conn ATTRIBUTE_UNUSED,
'A', -1, 1);
}
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
goto tear_down_tmpip6tchains;
iptablesCheckBridgeNFCallEnabled(true);
@ -3746,7 +3755,7 @@ ebiptablesApplyNewRules(virConnectPtr conn ATTRIBUTE_UNUSED,
if (virHashSize(chains_out_set) != 0)
ebtablesLinkTmpRootChain(&buf, 0, ifname, 1);
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status != 0)
if (ebiptablesExecCLI(&buf, NULL, &errmsg) < 0)
goto tear_down_ebsubchains_and_unlink;
virHashFree(chains_in_set);
@ -3756,6 +3765,8 @@ ebiptablesApplyNewRules(virConnectPtr conn ATTRIBUTE_UNUSED,
VIR_FREE(ebtChains[i].commandTemplate);
VIR_FREE(ebtChains);
VIR_FREE(errmsg);
return 0;
tear_down_ebsubchains_and_unlink:
@ -3783,12 +3794,14 @@ tear_down_tmpebchains:
ebtablesRemoveTmpRootChain(&buf, 0, ifname);
}
ebiptablesExecCLI(&buf, &cli_status);
ebiptablesExecCLI(&buf, &cli_status, NULL);
virNWFilterReportError(VIR_ERR_BUILD_FIREWALL,
_("Some rules could not be created for "
"interface %s."),
ifname);
"interface %s%s%s"),
ifname,
errmsg ? ": " : "",
errmsg ? errmsg : "");
exit_free_sets:
virHashFree(chains_in_set);
@ -3798,6 +3811,8 @@ exit_free_sets:
VIR_FREE(ebtChains[i].commandTemplate);
VIR_FREE(ebtChains);
VIR_FREE(errmsg);
return 1;
}
@ -3828,7 +3843,7 @@ ebiptablesTearNewRules(virConnectPtr conn ATTRIBUTE_UNUSED,
ebtablesRemoveTmpRootChain(&buf, 0, ifname);
}
ebiptablesExecCLI(&buf, &cli_status);
ebiptablesExecCLI(&buf, &cli_status, NULL);
return 0;
}
@ -3847,7 +3862,7 @@ ebiptablesTearOldRules(virConnectPtr conn ATTRIBUTE_UNUSED,
iptablesRemoveRootChains(iptables_cmd_path, &buf, ifname);
iptablesRenameTmpRootChains(iptables_cmd_path, &buf, ifname);
ebiptablesExecCLI(&buf, &cli_status);
ebiptablesExecCLI(&buf, &cli_status, NULL);
}
if (ip6tables_cmd_path) {
@ -3855,7 +3870,7 @@ ebiptablesTearOldRules(virConnectPtr conn ATTRIBUTE_UNUSED,
iptablesRemoveRootChains(ip6tables_cmd_path, &buf, ifname);
iptablesRenameTmpRootChains(ip6tables_cmd_path, &buf, ifname);
ebiptablesExecCLI(&buf, &cli_status);
ebiptablesExecCLI(&buf, &cli_status, NULL);
}
if (ebtables_cmd_path) {
@ -3869,7 +3884,7 @@ ebiptablesTearOldRules(virConnectPtr conn ATTRIBUTE_UNUSED,
ebtablesRenameTmpSubAndRootChains(&buf, ifname);
ebiptablesExecCLI(&buf, &cli_status);
ebiptablesExecCLI(&buf, &cli_status, NULL);
}
return 0;
@ -3906,7 +3921,7 @@ ebiptablesRemoveRules(virConnectPtr conn ATTRIBUTE_UNUSED,
'D', -1,
0);
if (ebiptablesExecCLI(&buf, &cli_status))
if (ebiptablesExecCLI(&buf, &cli_status, NULL))
goto err_exit;
if (cli_status) {
@ -3957,7 +3972,7 @@ ebiptablesAllTeardown(const char *ifname)
ebtablesRemoveRootChain(&buf, 1, ifname);
ebtablesRemoveRootChain(&buf, 0, ifname);
}
ebiptablesExecCLI(&buf, &cli_status);
ebiptablesExecCLI(&buf, &cli_status, NULL);
return 0;
}
@ -3991,7 +4006,6 @@ static int
ebiptablesDriverInit(bool privileged)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
int cli_status;
if (!privileged)
return 0;
@ -4012,7 +4026,7 @@ ebiptablesDriverInit(bool privileged)
ebtables_cmd_path, EBTABLES_DEFAULT_TABLE,
CMD_STOPONERR(1));
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status)
if (ebiptablesExecCLI(&buf, NULL, NULL) < 0)
VIR_FREE(ebtables_cmd_path);
}
@ -4025,7 +4039,7 @@ ebiptablesDriverInit(bool privileged)
iptables_cmd_path,
CMD_STOPONERR(1));
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status)
if (ebiptablesExecCLI(&buf, NULL, NULL) < 0)
VIR_FREE(iptables_cmd_path);
}
@ -4038,7 +4052,7 @@ ebiptablesDriverInit(bool privileged)
ip6tables_cmd_path,
CMD_STOPONERR(1));
if (ebiptablesExecCLI(&buf, &cli_status) || cli_status)
if (ebiptablesExecCLI(&buf, NULL, NULL) < 0)
VIR_FREE(ip6tables_cmd_path);
}