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log: include hostname in initial log message
On the very first log message we send to any output, we include the libvirt version number and package string. In some bug reports we have been given libvirtd.log files that came from a different host than the corresponding /var/log/libvirt/qemu log files. So extend the initial log message to include the hostname too. eg on first log message we would now see: $ libvirtd 2015-12-04 17:35:36.610+0000: 20917: info : libvirt version: 1.3.0 2015-12-04 17:35:36.610+0000: 20917: info : hostname: dhcp-1-180.lcy.redhat.com 2015-12-04 17:35:36.610+0000: 20917: error : qemuMonitorIO:687 : internal error: End of file from monitor Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
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a523770c32
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@ -2393,6 +2393,7 @@ virGetGroupID;
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virGetGroupList;
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virGetGroupName;
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virGetHostname;
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virGetHostnameQuiet;
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virGetListenFDs;
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virGetSCSIHostNameByParentaddr;
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virGetSCSIHostNumber;
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@ -94,7 +94,7 @@ static int virLogNbFilters;
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* after filtering, multiple output can be used simultaneously
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*/
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struct _virLogOutput {
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bool logVersion;
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bool logInitMessage;
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void *data;
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virLogOutputFunc f;
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virLogCloseFunc c;
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@ -402,7 +402,7 @@ virLogDefineOutput(virLogOutputFunc f,
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goto cleanup;
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}
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ret = virLogNbOutputs++;
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virLogOutputs[ret].logVersion = true;
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virLogOutputs[ret].logInitMessage = true;
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virLogOutputs[ret].f = f;
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virLogOutputs[ret].c = c;
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virLogOutputs[ret].data = data;
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@ -452,6 +452,32 @@ virLogVersionString(const char **rawmsg,
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return virLogFormatString(msg, 0, NULL, VIR_LOG_INFO, VIR_LOG_VERSION_STRING);
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}
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/* Similar to virGetHostname() but avoids use of error
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* reporting APIs or logging APIs, to prevent recursion
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*/
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static int
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virLogHostnameString(const char **rawmsg,
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char **msg)
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{
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char *hostname = virGetHostnameQuiet();
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char *hoststr;
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if (!hostname)
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return -1;
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if (virAsprintfQuiet(&hoststr, "hostname: %s", hostname) < 0) {
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VIR_FREE(hostname);
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return -1;
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}
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if (virLogFormatString(msg, 0, NULL, VIR_LOG_INFO, hoststr) < 0) {
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VIR_FREE(hoststr);
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return -1;
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}
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*rawmsg = hoststr;
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return 0;
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}
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static void
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virLogSourceUpdate(virLogSourcePtr source)
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@ -533,7 +559,7 @@ virLogVMessage(virLogSourcePtr source,
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const char *fmt,
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va_list vargs)
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{
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static bool logVersionStderr = true;
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static bool logInitMessageStderr = true;
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char *str = NULL;
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char *msg = NULL;
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char timestamp[VIR_TIME_STRING_BUFLEN];
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@ -583,16 +609,22 @@ virLogVMessage(virLogSourcePtr source,
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*/
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for (i = 0; i < virLogNbOutputs; i++) {
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if (priority >= virLogOutputs[i].priority) {
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if (virLogOutputs[i].logVersion) {
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const char *rawver;
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char *ver = NULL;
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if (virLogVersionString(&rawver, &ver) >= 0)
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if (virLogOutputs[i].logInitMessage) {
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const char *rawinitmsg;
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char *initmsg = NULL;
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if (virLogVersionString(&rawinitmsg, &initmsg) >= 0)
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virLogOutputs[i].f(&virLogSelf, VIR_LOG_INFO,
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__FILE__, __LINE__, __func__,
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timestamp, NULL, 0, rawver, ver,
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timestamp, NULL, 0, rawinitmsg, initmsg,
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virLogOutputs[i].data);
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VIR_FREE(ver);
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virLogOutputs[i].logVersion = false;
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VIR_FREE(initmsg);
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if (virLogHostnameString(&rawinitmsg, &initmsg) >= 0)
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virLogOutputs[i].f(&virLogSelf, VIR_LOG_INFO,
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__FILE__, __LINE__, __func__,
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timestamp, NULL, 0, rawinitmsg, initmsg,
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virLogOutputs[i].data);
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VIR_FREE(initmsg);
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virLogOutputs[i].logInitMessage = false;
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}
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virLogOutputs[i].f(source, priority,
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filename, linenr, funcname,
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@ -601,16 +633,22 @@ virLogVMessage(virLogSourcePtr source,
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}
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}
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if (virLogNbOutputs == 0) {
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if (logVersionStderr) {
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const char *rawver;
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char *ver = NULL;
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if (virLogVersionString(&rawver, &ver) >= 0)
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if (logInitMessageStderr) {
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const char *rawinitmsg;
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char *initmsg = NULL;
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if (virLogVersionString(&rawinitmsg, &initmsg) >= 0)
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virLogOutputToFd(&virLogSelf, VIR_LOG_INFO,
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__FILE__, __LINE__, __func__,
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timestamp, NULL, 0, rawver, ver,
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timestamp, NULL, 0, rawinitmsg, initmsg,
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(void *) STDERR_FILENO);
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VIR_FREE(ver);
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logVersionStderr = false;
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VIR_FREE(initmsg);
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if (virLogHostnameString(&rawinitmsg, &initmsg) >= 0)
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virLogOutputToFd(&virLogSelf, VIR_LOG_INFO,
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__FILE__, __LINE__, __func__,
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timestamp, NULL, 0, rawinitmsg, initmsg,
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(void *) STDERR_FILENO);
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VIR_FREE(initmsg);
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logInitMessageStderr = false;
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}
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virLogOutputToFd(source, priority,
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filename, linenr, funcname,
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@ -662,16 +662,18 @@ char *virIndexToDiskName(int idx, const char *prefix)
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* we got from getaddrinfo(). Return the value from gethostname()
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* and hope for the best.
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*/
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char *virGetHostname(void)
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static char *
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virGetHostnameImpl(bool quiet)
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{
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int r;
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char hostname[HOST_NAME_MAX+1], *result;
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char hostname[HOST_NAME_MAX+1], *result = NULL;
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struct addrinfo hints, *info;
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r = gethostname(hostname, sizeof(hostname));
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if (r == -1) {
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virReportSystemError(errno,
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"%s", _("failed to determine host name"));
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if (!quiet)
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virReportSystemError(errno,
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"%s", _("failed to determine host name"));
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return NULL;
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}
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NUL_TERMINATE(hostname);
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@ -683,7 +685,7 @@ char *virGetHostname(void)
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* string as-is; it's up to callers to check whether "localhost"
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* is allowed.
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*/
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ignore_value(VIR_STRDUP(result, hostname));
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ignore_value(VIR_STRDUP_QUIET(result, hostname));
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goto cleanup;
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}
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@ -696,9 +698,10 @@ char *virGetHostname(void)
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hints.ai_family = AF_UNSPEC;
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r = getaddrinfo(hostname, NULL, &hints, &info);
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if (r != 0) {
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VIR_WARN("getaddrinfo failed for '%s': %s",
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hostname, gai_strerror(r));
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ignore_value(VIR_STRDUP(result, hostname));
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if (!quiet)
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VIR_WARN("getaddrinfo failed for '%s': %s",
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hostname, gai_strerror(r));
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ignore_value(VIR_STRDUP_QUIET(result, hostname));
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goto cleanup;
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}
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@ -711,18 +714,34 @@ char *virGetHostname(void)
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* localhost. Ignore the canonicalized name and just return the
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* original hostname
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*/
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ignore_value(VIR_STRDUP(result, hostname));
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ignore_value(VIR_STRDUP_QUIET(result, hostname));
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else
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/* Caller frees this string. */
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ignore_value(VIR_STRDUP(result, info->ai_canonname));
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ignore_value(VIR_STRDUP_QUIET(result, info->ai_canonname));
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freeaddrinfo(info);
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cleanup:
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if (!result)
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virReportOOMError();
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return result;
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}
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char *
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virGetHostname(void)
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{
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return virGetHostnameImpl(false);
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}
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char *
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virGetHostnameQuiet(void)
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{
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return virGetHostnameImpl(true);
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}
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char *
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virGetUserDirectory(void)
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{
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@ -132,6 +132,7 @@ static inline int pthread_sigmask(int how,
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# endif
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char *virGetHostname(void);
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char *virGetHostnameQuiet(void);
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char *virGetUserDirectory(void);
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char *virGetUserDirectoryByUID(uid_t uid);
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