Signed-off-by: Praveen K Paladugu <praveenkpaladugu@xxxxxxxxx> --- po/POTFILES | 1 + src/hypervisor/domain_logcontext.c | 329 +++++++++++++++++++++++++++++ src/hypervisor/domain_logcontext.h | 41 ++++ 3 files changed, 371 insertions(+) create mode 100644 src/hypervisor/domain_logcontext.c create mode 100644 src/hypervisor/domain_logcontext.h diff --git a/po/POTFILES b/po/POTFILES index 3514aa3dca..1d3c3c0a81 100644 --- a/po/POTFILES +++ b/po/POTFILES @@ -94,6 +94,7 @@ src/hyperv/hyperv_util.c src/hyperv/hyperv_wmi.c src/hypervisor/domain_cgroup.c src/hypervisor/domain_driver.c +src/hypervisor/domain_logcontext.c src/hypervisor/domain_interface.c src/hypervisor/virhostdev.c src/interface/interface_backend_netcf.c diff --git a/src/hypervisor/domain_logcontext.c b/src/hypervisor/domain_logcontext.c new file mode 100644 index 0000000000..7932cf7712 --- /dev/null +++ b/src/hypervisor/domain_logcontext.c @@ -0,0 +1,329 @@ +/* + * domain_logcontext.c: QEMU log context + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see + * <http://www.gnu.org/licenses/>. + */ + +#include <config.h> + +#include "qemu_logcontext.h" +#include "viralloc.h" +#include "virlog.h" +#include "virstring.h" +#include "virutil.h" + +#include <fcntl.h> + +#define VIR_FROM_THIS VIR_FROM_QEMU + +VIR_LOG_INIT("qemu.qemu_logcontext"); + + +struct _qemuLogContext { + GObject parent; + + int writefd; + int readfd; /* Only used if manager == NULL */ + off_t pos; + ino_t inode; /* Only used if manager != NULL */ + char *path; + virLogManager *manager; +}; + +G_DEFINE_TYPE(qemuLogContext, qemu_log_context, G_TYPE_OBJECT); + +static void +qemuLogContextFinalize(GObject *obj); + + +static void +qemu_log_context_init(qemuLogContext *logctxt G_GNUC_UNUSED) +{ +} + + +static void +qemu_log_context_class_init(qemuLogContextClass *klass) +{ + GObjectClass *obj = G_OBJECT_CLASS(klass); + + obj->finalize = qemuLogContextFinalize; +} + + +static void +qemuLogContextFinalize(GObject *object) +{ + qemuLogContext *ctxt = QEMU_LOG_CONTEXT(object); + VIR_DEBUG("ctxt=%p", ctxt); + + virLogManagerFree(ctxt->manager); + VIR_FREE(ctxt->path); + VIR_FORCE_CLOSE(ctxt->writefd); + VIR_FORCE_CLOSE(ctxt->readfd); + G_OBJECT_CLASS(qemu_log_context_parent_class)->finalize(object); +} + + +qemuLogContext * +qemuLogContextNew(virQEMUDriver *driver, + virDomainObj *vm, + const char *basename) +{ + g_autoptr(virQEMUDriverConfig) cfg = virQEMUDriverGetConfig(driver); + qemuLogContext *ctxt = QEMU_LOG_CONTEXT(g_object_new(QEMU_TYPE_LOG_CONTEXT, NULL)); + + VIR_DEBUG("Context new %p stdioLogD=%d", ctxt, cfg->stdioLogD); + ctxt->writefd = -1; + ctxt->readfd = -1; + + ctxt->path = g_strdup_printf("%s/%s.log", cfg->logDir, basename); + + if (cfg->stdioLogD) { + ctxt->manager = virLogManagerNew(driver->privileged); + if (!ctxt->manager) + goto error; + + ctxt->writefd = virLogManagerDomainOpenLogFile(ctxt->manager, + "qemu", + vm->def->uuid, + vm->def->name, + ctxt->path, + 0, + &ctxt->inode, + &ctxt->pos); + if (ctxt->writefd < 0) + goto error; + } else { + if ((ctxt->writefd = open(ctxt->path, O_WRONLY | O_CREAT | O_APPEND, S_IRUSR | S_IWUSR)) < 0) { + virReportSystemError(errno, _("failed to create logfile %1$s"), + ctxt->path); + goto error; + } + if (virSetCloseExec(ctxt->writefd) < 0) { + virReportSystemError(errno, _("failed to set close-on-exec flag on %1$s"), + ctxt->path); + goto error; + } + + /* For unprivileged startup we must truncate the file since + * we can't rely on logrotate. We don't use O_TRUNC since + * it is better for SELinux policy if we truncate afterwards */ + if (!driver->privileged && + ftruncate(ctxt->writefd, 0) < 0) { + virReportSystemError(errno, _("failed to truncate %1$s"), + ctxt->path); + goto error; + } + + if ((ctxt->readfd = open(ctxt->path, O_RDONLY)) < 0) { + virReportSystemError(errno, _("failed to open logfile %1$s"), + ctxt->path); + goto error; + } + if (virSetCloseExec(ctxt->readfd) < 0) { + virReportSystemError(errno, _("failed to set close-on-exec flag on %1$s"), + ctxt->path); + goto error; + } + + if ((ctxt->pos = lseek(ctxt->writefd, 0, SEEK_END)) < 0) { + virReportSystemError(errno, _("failed to seek in log file %1$s"), + ctxt->path); + goto error; + } + } + + return ctxt; + + error: + g_clear_object(&ctxt); + return NULL; +} + + +int +qemuLogContextWrite(qemuLogContext *ctxt, + const char *fmt, ...) +{ + va_list argptr; + g_autofree char *message = NULL; + int ret = -1; + + va_start(argptr, fmt); + + message = g_strdup_vprintf(fmt, argptr); + if (!ctxt->manager && + lseek(ctxt->writefd, 0, SEEK_END) < 0) { + virReportSystemError(errno, "%s", + _("Unable to seek to end of domain logfile")); + goto cleanup; + } + if (safewrite(ctxt->writefd, message, strlen(message)) < 0) { + virReportSystemError(errno, "%s", + _("Unable to write to domain logfile")); + goto cleanup; + } + + ret = 0; + + cleanup: + va_end(argptr); + return ret; +} + + +ssize_t +qemuLogContextRead(qemuLogContext *ctxt, + char **msg) +{ + char *buf; + size_t buflen; + + VIR_DEBUG("Context read %p manager=%p inode=%llu pos=%llu", + ctxt, ctxt->manager, + (unsigned long long)ctxt->inode, + (unsigned long long)ctxt->pos); + + if (ctxt->manager) { + buf = virLogManagerDomainReadLogFile(ctxt->manager, + ctxt->path, + ctxt->inode, + ctxt->pos, + 1024 * 128, + 0); + if (!buf) + return -1; + buflen = strlen(buf); + } else { + ssize_t got; + + buflen = 1024 * 128; + + /* Best effort jump to start of messages */ + ignore_value(lseek(ctxt->readfd, ctxt->pos, SEEK_SET)); + + buf = g_new0(char, buflen); + + got = saferead(ctxt->readfd, buf, buflen - 1); + if (got < 0) { + VIR_FREE(buf); + virReportSystemError(errno, "%s", + _("Unable to read from log file")); + return -1; + } + + buf[got] = '\0'; + + buf = g_renew(char, buf, got + 1); + buflen = got; + } + + *msg = buf; + + return buflen; +} + + +/** + * qemuLogContextFilter: Read and filter log for relevant messages + * @ctxt: the domain log context + * @msg: pointer to buffer to store the read messages in + * @max: maximum length of the message returned in @msg after filtering + * + * Reads log output from @ctxt and filters it. Skips messages not produced by + * the target executable or irrelevant messages. If @max is not zero, @buf will + * contain at most @max characters from the end of the log and @buf will start + * after a new line if possible. + */ +int +qemuLogContextReadFiltered(qemuLogContext *ctxt, + char **msg, + size_t max) +{ + char *buf; + char *eol; + char *filter_next; + size_t skip; + ssize_t got; + + if ((got = qemuLogContextRead(ctxt, &buf)) < 0) + return -1; + + /* Filter out debug messages from intermediate libvirt process */ + filter_next = buf; + while ((eol = strchr(filter_next, '\n'))) { + *eol = '\0'; + if (virLogProbablyLogMessage(filter_next) || + strstr(filter_next, "char device redirected to")) { + skip = (eol + 1) - filter_next; + memmove(filter_next, eol + 1, buf + got - eol); + got -= skip; + } else { + filter_next = eol + 1; + *eol = '\n'; + } + } + + if (got > 0 && + buf[got - 1] == '\n') { + buf[got - 1] = '\0'; + got--; + } + + if (max > 0 && got > max) { + skip = got - max; + + if (buf[skip - 1] != '\n' && + (eol = strchr(buf + skip, '\n')) && + !virStringIsEmpty(eol + 1)) + skip = eol + 1 - buf; + + memmove(buf, buf + skip, got - skip + 1); + got -= skip; + } + + buf = g_renew(char, buf, got + 1); + *msg = buf; + return 0; +} + + +int +qemuLogContextGetWriteFD(qemuLogContext *ctxt) +{ + return ctxt->writefd; +} + + +void +qemuLogContextMarkPosition(qemuLogContext *ctxt) +{ + if (ctxt->manager) + virLogManagerDomainGetLogFilePosition(ctxt->manager, + ctxt->path, + 0, + &ctxt->inode, + &ctxt->pos); + else + ctxt->pos = lseek(ctxt->writefd, 0, SEEK_END); +} + + +virLogManager * +qemuLogContextGetManager(qemuLogContext *ctxt) +{ + return ctxt->manager; +} diff --git a/src/hypervisor/domain_logcontext.h b/src/hypervisor/domain_logcontext.h new file mode 100644 index 0000000000..572ac1026e --- /dev/null +++ b/src/hypervisor/domain_logcontext.h @@ -0,0 +1,41 @@ +/* + * domain_logcontext.h: QEMU log context + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library. If not, see + * <http://www.gnu.org/licenses/>. + */ + +#pragma once + +#include <glib-object.h> +#include "qemu_conf.h" +#include "logging/log_manager.h" + +#define QEMU_TYPE_LOG_CONTEXT qemu_log_context_get_type() +G_DECLARE_FINAL_TYPE(qemuLogContext, qemu_log_context, QEMU, LOG_CONTEXT, GObject); + +qemuLogContext *qemuLogContextNew(virQEMUDriver *driver, + virDomainObj *vm, + const char *basename); +int qemuLogContextWrite(qemuLogContext *ctxt, + const char *fmt, ...) G_GNUC_PRINTF(2, 3); +ssize_t qemuLogContextRead(qemuLogContext *ctxt, + char **msg); +int qemuLogContextReadFiltered(qemuLogContext *ctxt, + char **msg, + size_t max); +int qemuLogContextGetWriteFD(qemuLogContext *ctxt); +void qemuLogContextMarkPosition(qemuLogContext *ctxt); + +virLogManager *qemuLogContextGetManager(qemuLogContext *ctxt); -- 2.47.0
