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-rw-r--r--lib/zlog.c1061
1 files changed, 1061 insertions, 0 deletions
diff --git a/lib/zlog.c b/lib/zlog.c
new file mode 100644
index 0000000..6a36a0b
--- /dev/null
+++ b/lib/zlog.c
@@ -0,0 +1,1061 @@
+/*
+ * Copyright (c) 2015-19 David Lamparter, for NetDEF, Inc.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "zebra.h"
+
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <time.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdarg.h>
+#include <pthread.h>
+
+/* gettid() & co. */
+#ifdef HAVE_PTHREAD_NP_H
+#include <pthread_np.h>
+#endif
+#ifdef linux
+#include <sys/syscall.h>
+#endif
+#ifdef __FreeBSD__
+#include <sys/thr.h>
+#endif
+#ifdef __NetBSD__
+#include <lwp.h>
+#endif
+#ifdef __DragonFly__
+#include <sys/lwp.h>
+#endif
+#ifdef __APPLE__
+#include <mach/mach_traps.h>
+#endif
+
+#ifdef HAVE_LIBUNWIND
+#define UNW_LOCAL_ONLY
+#include <libunwind.h>
+#include <dlfcn.h>
+#endif
+
+#include "memory.h"
+#include "atomlist.h"
+#include "printfrr.h"
+#include "frrcu.h"
+#include "zlog.h"
+#include "libfrr_trace.h"
+#include "thread.h"
+
+DEFINE_MTYPE_STATIC(LIB, LOG_MESSAGE, "log message");
+DEFINE_MTYPE_STATIC(LIB, LOG_TLSBUF, "log thread-local buffer");
+
+DEFINE_HOOK(zlog_init, (const char *progname, const char *protoname,
+ unsigned short instance, uid_t uid, gid_t gid),
+ (progname, protoname, instance, uid, gid));
+DEFINE_KOOH(zlog_fini, (), ());
+DEFINE_HOOK(zlog_aux_init, (const char *prefix, int prio_min),
+ (prefix, prio_min));
+
+char zlog_prefix[128];
+size_t zlog_prefixsz;
+int zlog_tmpdirfd = -1;
+int zlog_instance = -1;
+
+static atomic_bool zlog_ec = true, zlog_xid = true;
+
+/* these are kept around because logging is initialized (and directories
+ * & files created) before zprivs code switches to the FRR user; therefore
+ * we need to chown() things so we don't get permission errors later when
+ * trying to delete things on shutdown
+ */
+static uid_t zlog_uid = -1;
+static gid_t zlog_gid = -1;
+
+DECLARE_ATOMLIST(zlog_targets, struct zlog_target, head);
+static struct zlog_targets_head zlog_targets;
+
+/* Global setting for buffered vs immediate output. The default is
+ * per-pthread buffering.
+ */
+static bool default_immediate;
+
+/* cf. zlog.h for additional comments on this struct.
+ *
+ * Note: you MUST NOT pass the format string + va_list to non-FRR format
+ * string functions (e.g. vsyslog, sd_journal_printv, ...) since FRR uses an
+ * extended prinf() with additional formats (%pI4 and the like).
+ *
+ * Also remember to use va_copy() on args.
+ */
+
+struct zlog_msg {
+ struct timespec ts;
+ int prio;
+
+ const char *fmt;
+ va_list args;
+ const struct xref_logmsg *xref;
+
+ char *stackbuf;
+ size_t stackbufsz;
+ char *text;
+ size_t textlen;
+ size_t hdrlen;
+
+ /* This is always ISO8601 with sub-second precision 9 here, it's
+ * converted for callers as needed. ts_dot points to the "."
+ * separating sub-seconds. ts_zonetail is "Z" or "+00:00" for the
+ * local time offset.
+ *
+ * Valid if ZLOG_TS_ISO8601 is set.
+ * (0 if timestamp has not been formatted yet)
+ */
+ char ts_str[32], *ts_dot, ts_zonetail[8];
+ uint32_t ts_flags;
+
+ /* "mmm dd hh:mm:ss" for 3164 legacy syslog - too dissimilar from
+ * the above, so just kept separately here.
+ */
+ uint32_t ts_3164_flags;
+ char ts_3164_str[16];
+
+ /* at the time of writing, 16 args was the actual maximum of arguments
+ * to a single zlog call. Particularly printing flag bitmasks seems
+ * to drive this. That said, the overhead of dynamically sizing this
+ * probably outweighs the value. If anything, a printfrr extension
+ * for printing flag bitmasks might be a good idea.
+ */
+ struct fmt_outpos argpos[24];
+ size_t n_argpos;
+};
+
+/* thread-local log message buffering
+ *
+ * This is strictly optional and set up by calling zlog_tls_buffer_init()
+ * on a particular thread.
+ *
+ * If in use, this will create a temporary file in /var/tmp which is used as
+ * memory-mapped MAP_SHARED log message buffer. The idea there is that buffer
+ * access doesn't require any syscalls, but in case of a crash the kernel
+ * knows to sync the memory back to disk. This way the user can still get the
+ * last log messages if there were any left unwritten in the buffer.
+ *
+ * Sizing this dynamically isn't particularly useful, so here's an 8k buffer
+ * with a message limit of 64 messages. Message metadata (e.g. priority,
+ * timestamp) aren't in the mmap region, so they're lost on crash, but we can
+ * live with that.
+ */
+
+#if defined(HAVE_OPENAT) && defined(HAVE_UNLINKAT)
+#define CAN_DO_TLS 1
+#endif
+
+#define TLS_LOG_BUF_SIZE 8192
+#define TLS_LOG_MAXMSG 64
+
+struct zlog_tls {
+ char *mmbuf;
+ size_t bufpos;
+ bool do_unlink;
+
+ size_t nmsgs;
+ struct zlog_msg msgs[TLS_LOG_MAXMSG];
+ struct zlog_msg *msgp[TLS_LOG_MAXMSG];
+};
+
+static inline void zlog_tls_free(void *arg);
+
+/* proper ELF TLS is a bit faster than pthread_[gs]etspecific, so if it's
+ * available we'll use it here
+ */
+
+#ifdef __OpenBSD__
+static pthread_key_t zlog_tls_key;
+
+static void zlog_tls_key_init(void) __attribute__((_CONSTRUCTOR(500)));
+static void zlog_tls_key_init(void)
+{
+ pthread_key_create(&zlog_tls_key, zlog_tls_free);
+}
+
+static void zlog_tls_key_fini(void) __attribute__((_DESTRUCTOR(500)));
+static void zlog_tls_key_fini(void)
+{
+ pthread_key_delete(zlog_tls_key);
+}
+
+static inline struct zlog_tls *zlog_tls_get(void)
+{
+ return pthread_getspecific(zlog_tls_key);
+}
+
+static inline void zlog_tls_set(struct zlog_tls *val)
+{
+ pthread_setspecific(zlog_tls_key, val);
+}
+#else
+# ifndef thread_local
+# define thread_local __thread
+# endif
+
+static thread_local struct zlog_tls *zlog_tls_var
+ __attribute__((tls_model("initial-exec")));
+
+static inline struct zlog_tls *zlog_tls_get(void)
+{
+ return zlog_tls_var;
+}
+
+static inline void zlog_tls_set(struct zlog_tls *val)
+{
+ zlog_tls_var = val;
+}
+#endif
+
+#ifdef CAN_DO_TLS
+static intmax_t zlog_gettid(void)
+{
+#ifndef __OpenBSD__
+ /* accessing a TLS variable is much faster than a syscall */
+ static thread_local intmax_t cached_tid = -1;
+ if (cached_tid != -1)
+ return cached_tid;
+#endif
+
+ long rv = -1;
+#ifdef HAVE_PTHREAD_GETTHREADID_NP
+ rv = pthread_getthreadid_np();
+#elif defined(linux)
+ rv = syscall(__NR_gettid);
+#elif defined(__NetBSD__)
+ rv = _lwp_self();
+#elif defined(__FreeBSD__)
+ thr_self(&rv);
+#elif defined(__DragonFly__)
+ rv = lwp_gettid();
+#elif defined(__OpenBSD__)
+ rv = getthrid();
+#elif defined(__sun)
+ rv = pthread_self();
+#elif defined(__APPLE__)
+ rv = mach_thread_self();
+ mach_port_deallocate(mach_task_self(), rv);
+#endif
+
+#ifndef __OpenBSD__
+ cached_tid = rv;
+#endif
+ return rv;
+}
+
+void zlog_tls_buffer_init(void)
+{
+ struct zlog_tls *zlog_tls;
+ char mmpath[MAXPATHLEN];
+ int mmfd;
+ size_t i;
+
+ zlog_tls = zlog_tls_get();
+
+ if (zlog_tls || zlog_tmpdirfd < 0)
+ return;
+
+ zlog_tls = XCALLOC(MTYPE_LOG_TLSBUF, sizeof(*zlog_tls));
+ for (i = 0; i < array_size(zlog_tls->msgp); i++)
+ zlog_tls->msgp[i] = &zlog_tls->msgs[i];
+
+ snprintfrr(mmpath, sizeof(mmpath), "logbuf.%jd", zlog_gettid());
+
+ mmfd = openat(zlog_tmpdirfd, mmpath,
+ O_RDWR | O_CREAT | O_EXCL | O_CLOEXEC, 0600);
+ if (mmfd < 0) {
+ zlog_err("failed to open thread log buffer \"%s\": %s",
+ mmpath, strerror(errno));
+ goto out_anon;
+ }
+ fchown(mmfd, zlog_uid, zlog_gid);
+
+#ifdef HAVE_POSIX_FALLOCATE
+ if (posix_fallocate(mmfd, 0, TLS_LOG_BUF_SIZE) != 0)
+ /* note next statement is under above if() */
+#endif
+ if (ftruncate(mmfd, TLS_LOG_BUF_SIZE) < 0) {
+ zlog_err("failed to allocate thread log buffer \"%s\": %s",
+ mmpath, strerror(errno));
+ goto out_anon_unlink;
+ }
+
+ zlog_tls->mmbuf = mmap(NULL, TLS_LOG_BUF_SIZE, PROT_READ | PROT_WRITE,
+ MAP_SHARED, mmfd, 0);
+ if (zlog_tls->mmbuf == MAP_FAILED) {
+ zlog_err("failed to mmap thread log buffer \"%s\": %s",
+ mmpath, strerror(errno));
+ goto out_anon_unlink;
+ }
+ zlog_tls->do_unlink = true;
+
+ close(mmfd);
+ zlog_tls_set(zlog_tls);
+ return;
+
+out_anon_unlink:
+ unlinkat(zlog_tmpdirfd, mmpath, 0);
+ close(mmfd);
+out_anon:
+
+#ifndef MAP_ANONYMOUS
+#define MAP_ANONYMOUS MAP_ANON
+#endif
+ zlog_tls->mmbuf = mmap(NULL, TLS_LOG_BUF_SIZE, PROT_READ | PROT_WRITE,
+ MAP_ANONYMOUS | MAP_PRIVATE, -1, 0);
+
+ if (!zlog_tls->mmbuf) {
+ zlog_err("failed to anonymous-mmap thread log buffer: %s",
+ strerror(errno));
+ XFREE(MTYPE_LOG_TLSBUF, zlog_tls);
+ zlog_tls_set(NULL);
+ return;
+ }
+
+ zlog_tls_set(zlog_tls);
+}
+
+void zlog_tls_buffer_fini(void)
+{
+ char mmpath[MAXPATHLEN];
+ struct zlog_tls *zlog_tls = zlog_tls_get();
+ bool do_unlink = zlog_tls ? zlog_tls->do_unlink : false;
+
+ zlog_tls_buffer_flush();
+
+ zlog_tls_free(zlog_tls);
+ zlog_tls_set(NULL);
+
+ snprintfrr(mmpath, sizeof(mmpath), "logbuf.%jd", zlog_gettid());
+ if (do_unlink && unlinkat(zlog_tmpdirfd, mmpath, 0))
+ zlog_err("unlink logbuf: %s (%d)", strerror(errno), errno);
+}
+
+#else /* !CAN_DO_TLS */
+void zlog_tls_buffer_init(void)
+{
+}
+
+void zlog_tls_buffer_fini(void)
+{
+}
+#endif
+
+void zlog_msg_pid(struct zlog_msg *msg, intmax_t *pid, intmax_t *tid)
+{
+#ifndef __OpenBSD__
+ static thread_local intmax_t cached_pid = -1;
+ if (cached_pid != -1)
+ *pid = cached_pid;
+ else
+ cached_pid = *pid = (intmax_t)getpid();
+#else
+ *pid = (intmax_t)getpid();
+#endif
+#ifdef CAN_DO_TLS
+ *tid = zlog_gettid();
+#else
+ *tid = *pid;
+#endif
+}
+
+static inline void zlog_tls_free(void *arg)
+{
+ struct zlog_tls *zlog_tls = arg;
+
+ if (!zlog_tls)
+ return;
+
+ munmap(zlog_tls->mmbuf, TLS_LOG_BUF_SIZE);
+ XFREE(MTYPE_LOG_TLSBUF, zlog_tls);
+}
+
+void zlog_tls_buffer_flush(void)
+{
+ struct zlog_target *zt;
+ struct zlog_tls *zlog_tls = zlog_tls_get();
+
+ if (!zlog_tls)
+ return;
+ if (!zlog_tls->nmsgs)
+ return;
+
+ rcu_read_lock();
+ frr_each_safe (zlog_targets, &zlog_targets, zt) {
+ if (!zt->logfn)
+ continue;
+
+ zt->logfn(zt, zlog_tls->msgp, zlog_tls->nmsgs);
+ }
+ rcu_read_unlock();
+
+ zlog_tls->bufpos = 0;
+ zlog_tls->nmsgs = 0;
+}
+
+
+static void vzlog_notls(const struct xref_logmsg *xref, int prio,
+ const char *fmt, va_list ap)
+{
+ struct zlog_target *zt;
+ struct zlog_msg stackmsg = {
+ .prio = prio & LOG_PRIMASK,
+ .fmt = fmt,
+ .xref = xref,
+ }, *msg = &stackmsg;
+ char stackbuf[512];
+
+ clock_gettime(CLOCK_REALTIME, &msg->ts);
+ va_copy(msg->args, ap);
+ msg->stackbuf = stackbuf;
+ msg->stackbufsz = sizeof(stackbuf);
+
+ rcu_read_lock();
+ frr_each_safe (zlog_targets, &zlog_targets, zt) {
+ if (prio > zt->prio_min)
+ continue;
+ if (!zt->logfn)
+ continue;
+
+ zt->logfn(zt, &msg, 1);
+ }
+ rcu_read_unlock();
+
+ va_end(msg->args);
+ if (msg->text && msg->text != stackbuf)
+ XFREE(MTYPE_LOG_MESSAGE, msg->text);
+}
+
+static void vzlog_tls(struct zlog_tls *zlog_tls, const struct xref_logmsg *xref,
+ int prio, const char *fmt, va_list ap)
+{
+ struct zlog_target *zt;
+ struct zlog_msg *msg;
+ char *buf;
+ bool ignoremsg = true;
+ bool immediate = default_immediate;
+
+ /* avoid further processing cost if no target wants this message */
+ rcu_read_lock();
+ frr_each (zlog_targets, &zlog_targets, zt) {
+ if (prio > zt->prio_min)
+ continue;
+ ignoremsg = false;
+ break;
+ }
+ rcu_read_unlock();
+
+ if (ignoremsg)
+ return;
+
+ msg = &zlog_tls->msgs[zlog_tls->nmsgs];
+ zlog_tls->nmsgs++;
+ if (zlog_tls->nmsgs == array_size(zlog_tls->msgs))
+ immediate = true;
+
+ memset(msg, 0, sizeof(*msg));
+ clock_gettime(CLOCK_REALTIME, &msg->ts);
+ va_copy(msg->args, ap);
+ msg->stackbuf = buf = zlog_tls->mmbuf + zlog_tls->bufpos;
+ msg->stackbufsz = TLS_LOG_BUF_SIZE - zlog_tls->bufpos - 1;
+ msg->fmt = fmt;
+ msg->prio = prio & LOG_PRIMASK;
+ msg->xref = xref;
+ if (msg->prio < LOG_INFO)
+ immediate = true;
+
+ if (!immediate) {
+ /* messages written later need to take the formatting cost
+ * immediately since we can't hold a reference on varargs
+ */
+ zlog_msg_text(msg, NULL);
+
+ if (msg->text != buf)
+ /* zlog_msg_text called malloc() on us :( */
+ immediate = true;
+ else {
+ zlog_tls->bufpos += msg->textlen + 1;
+ /* write a second \0 to mark current end position
+ * (in case of crash this signals end of unwritten log
+ * messages in mmap'd logbuf file)
+ */
+ zlog_tls->mmbuf[zlog_tls->bufpos] = '\0';
+
+ /* avoid malloc() for next message */
+ if (TLS_LOG_BUF_SIZE - zlog_tls->bufpos < 256)
+ immediate = true;
+ }
+ }
+
+ if (immediate)
+ zlog_tls_buffer_flush();
+
+ va_end(msg->args);
+ if (msg->text && msg->text != buf)
+ XFREE(MTYPE_LOG_MESSAGE, msg->text);
+}
+
+static void zlog_backtrace_msg(const struct xref_logmsg *xref, int prio)
+{
+ struct thread *tc = pthread_getspecific(thread_current);
+ const char *uid = xref->xref.xrefdata->uid;
+ bool found_thread = false;
+
+ zlog(prio, "| (%s) message in thread %jd, at %s(), %s:%d", uid,
+ zlog_gettid(), xref->xref.func, xref->xref.file, xref->xref.line);
+
+#ifdef HAVE_LIBUNWIND
+ const char *threadfunc = tc ? tc->xref->funcname : NULL;
+ bool found_caller = false;
+ unw_cursor_t cursor;
+ unw_context_t uc;
+ unw_word_t ip, off, sp;
+ Dl_info dlinfo;
+
+ unw_getcontext(&uc);
+
+ unw_init_local(&cursor, &uc);
+ while (unw_step(&cursor) > 0) {
+ char buf[96], name[128] = "?";
+ bool is_thread = false;
+
+ unw_get_reg(&cursor, UNW_REG_IP, &ip);
+ unw_get_reg(&cursor, UNW_REG_SP, &sp);
+
+ if (unw_is_signal_frame(&cursor))
+ zlog(prio, "| (%s) ---- signal ----", uid);
+
+ if (!unw_get_proc_name(&cursor, buf, sizeof(buf), &off)) {
+ if (!strcmp(buf, xref->xref.func))
+ found_caller = true;
+ if (threadfunc && !strcmp(buf, threadfunc))
+ found_thread = is_thread = true;
+
+ snprintf(name, sizeof(name), "%s+%#lx", buf, (long)off);
+ }
+
+ if (!found_caller)
+ continue;
+
+ if (dladdr((void *)ip, &dlinfo))
+ zlog(prio, "| (%s) %-36s %16lx+%08lx %16lx %s", uid,
+ name, (long)dlinfo.dli_fbase,
+ (long)ip - (long)dlinfo.dli_fbase, (long)sp,
+ dlinfo.dli_fname);
+ else
+ zlog(prio, "| (%s) %-36s %16lx %16lx", uid, name,
+ (long)ip, (long)sp);
+
+ if (is_thread)
+ zlog(prio, "| (%s) ^- scheduled from %s(), %s:%u", uid,
+ tc->xref->xref.func, tc->xref->xref.file,
+ tc->xref->xref.line);
+ }
+#elif defined(HAVE_GLIBC_BACKTRACE)
+ void *frames[64];
+ char **names = NULL;
+ int n_frames, i;
+
+ n_frames = backtrace(frames, array_size(frames));
+ if (n_frames < 0)
+ n_frames = 0;
+ if (n_frames)
+ names = backtrace_symbols(frames, n_frames);
+
+ for (i = 0; i < n_frames; i++) {
+ void *retaddr = frames[i];
+ char *loc = names[i];
+
+ zlog(prio, "| (%s) %16lx %-36s", uid, (long)retaddr, loc);
+ }
+ free(names);
+#endif
+ if (!found_thread && tc)
+ zlog(prio, "| (%s) scheduled from %s(), %s:%u", uid,
+ tc->xref->xref.func, tc->xref->xref.file,
+ tc->xref->xref.line);
+}
+
+void vzlogx(const struct xref_logmsg *xref, int prio,
+ const char *fmt, va_list ap)
+{
+ struct zlog_tls *zlog_tls = zlog_tls_get();
+
+#ifdef HAVE_LTTNG
+ va_list copy;
+ va_copy(copy, ap);
+ char *msg = vasprintfrr(MTYPE_LOG_MESSAGE, fmt, copy);
+
+ switch (prio) {
+ case LOG_ERR:
+ frrtracelog(TRACE_ERR, msg);
+ break;
+ case LOG_WARNING:
+ frrtracelog(TRACE_WARNING, msg);
+ break;
+ case LOG_DEBUG:
+ frrtracelog(TRACE_DEBUG, msg);
+ break;
+ case LOG_NOTICE:
+ frrtracelog(TRACE_DEBUG, msg);
+ break;
+ case LOG_INFO:
+ default:
+ frrtracelog(TRACE_INFO, msg);
+ break;
+ }
+
+ va_end(copy);
+ XFREE(MTYPE_LOG_MESSAGE, msg);
+#endif
+
+ if (zlog_tls)
+ vzlog_tls(zlog_tls, xref, prio, fmt, ap);
+ else
+ vzlog_notls(xref, prio, fmt, ap);
+
+ if (xref) {
+ struct xrefdata_logmsg *xrdl;
+
+ xrdl = container_of(xref->xref.xrefdata, struct xrefdata_logmsg,
+ xrefdata);
+ if (xrdl->fl_print_bt)
+ zlog_backtrace_msg(xref, prio);
+ }
+}
+
+void zlog_sigsafe(const char *text, size_t len)
+{
+ struct zlog_target *zt;
+ const char *end = text + len, *nlpos;
+
+ while (text < end) {
+ nlpos = memchr(text, '\n', end - text);
+ if (!nlpos)
+ nlpos = end;
+
+ frr_each (zlog_targets, &zlog_targets, zt) {
+ if (LOG_CRIT > zt->prio_min)
+ continue;
+ if (!zt->logfn_sigsafe)
+ continue;
+
+ zt->logfn_sigsafe(zt, text, nlpos - text);
+ }
+
+ if (nlpos == end)
+ break;
+ text = nlpos + 1;
+ }
+}
+
+void _zlog_assert_failed(const struct xref_assert *xref, const char *extra, ...)
+{
+ va_list ap;
+ static bool assert_in_assert; /* "global-ish" variable, init to 0 */
+
+ if (assert_in_assert)
+ abort();
+ assert_in_assert = true;
+
+ if (extra) {
+ struct va_format vaf;
+
+ va_start(ap, extra);
+ vaf.fmt = extra;
+ vaf.va = &ap;
+
+ zlog(LOG_CRIT,
+ "%s:%d: %s(): assertion (%s) failed, extra info: %pVA",
+ xref->xref.file, xref->xref.line, xref->xref.func,
+ xref->expr, &vaf);
+
+ va_end(ap);
+ } else
+ zlog(LOG_CRIT, "%s:%d: %s(): assertion (%s) failed",
+ xref->xref.file, xref->xref.line, xref->xref.func,
+ xref->expr);
+
+ /* abort() prints backtrace & memstats in SIGABRT handler */
+ abort();
+}
+
+int zlog_msg_prio(struct zlog_msg *msg)
+{
+ return msg->prio;
+}
+
+const struct xref_logmsg *zlog_msg_xref(struct zlog_msg *msg)
+{
+ return msg->xref;
+}
+
+const char *zlog_msg_text(struct zlog_msg *msg, size_t *textlen)
+{
+ if (!msg->text) {
+ va_list args;
+ bool do_xid, do_ec;
+ size_t need = 0, hdrlen;
+ struct fbuf fb = {
+ .buf = msg->stackbuf,
+ .pos = msg->stackbuf,
+ .len = msg->stackbufsz,
+ };
+
+ do_ec = atomic_load_explicit(&zlog_ec, memory_order_relaxed);
+ do_xid = atomic_load_explicit(&zlog_xid, memory_order_relaxed);
+
+ if (msg->xref && do_xid && msg->xref->xref.xrefdata->uid[0]) {
+ need += bputch(&fb, '[');
+ need += bputs(&fb, msg->xref->xref.xrefdata->uid);
+ need += bputch(&fb, ']');
+ }
+ if (msg->xref && do_ec && msg->xref->ec)
+ need += bprintfrr(&fb, "[EC %u]", msg->xref->ec);
+ if (need)
+ need += bputch(&fb, ' ');
+
+ msg->hdrlen = hdrlen = need;
+ assert(hdrlen < msg->stackbufsz);
+
+ fb.outpos = msg->argpos;
+ fb.outpos_n = array_size(msg->argpos);
+ fb.outpos_i = 0;
+
+ va_copy(args, msg->args);
+ need += vbprintfrr(&fb, msg->fmt, args);
+ va_end(args);
+
+ msg->textlen = need;
+ need += bputch(&fb, '\n');
+
+ if (need <= msg->stackbufsz)
+ msg->text = msg->stackbuf;
+ else {
+ msg->text = XMALLOC(MTYPE_LOG_MESSAGE, need);
+
+ memcpy(msg->text, msg->stackbuf, hdrlen);
+
+ fb.buf = msg->text;
+ fb.len = need;
+ fb.pos = msg->text + hdrlen;
+ fb.outpos_i = 0;
+
+ va_copy(args, msg->args);
+ vbprintfrr(&fb, msg->fmt, args);
+ va_end(args);
+
+ bputch(&fb, '\n');
+ }
+
+ msg->n_argpos = fb.outpos_i;
+ }
+ if (textlen)
+ *textlen = msg->textlen;
+ return msg->text;
+}
+
+void zlog_msg_args(struct zlog_msg *msg, size_t *hdrlen, size_t *n_argpos,
+ const struct fmt_outpos **argpos)
+{
+ if (!msg->text)
+ zlog_msg_text(msg, NULL);
+
+ if (hdrlen)
+ *hdrlen = msg->hdrlen;
+ if (n_argpos)
+ *n_argpos = msg->n_argpos;
+ if (argpos)
+ *argpos = msg->argpos;
+}
+
+#define ZLOG_TS_FORMAT (ZLOG_TS_ISO8601 | ZLOG_TS_LEGACY)
+#define ZLOG_TS_FLAGS ~ZLOG_TS_PREC
+
+size_t zlog_msg_ts(struct zlog_msg *msg, struct fbuf *out, uint32_t flags)
+{
+ size_t outsz = out ? (out->buf + out->len - out->pos) : 0;
+ size_t len1;
+
+ if (!(flags & ZLOG_TS_FORMAT))
+ return 0;
+
+ if (!(msg->ts_flags & ZLOG_TS_FORMAT) ||
+ ((msg->ts_flags ^ flags) & ZLOG_TS_UTC)) {
+ struct tm tm;
+
+ if (flags & ZLOG_TS_UTC)
+ gmtime_r(&msg->ts.tv_sec, &tm);
+ else
+ localtime_r(&msg->ts.tv_sec, &tm);
+
+ strftime(msg->ts_str, sizeof(msg->ts_str),
+ "%Y-%m-%dT%H:%M:%S", &tm);
+
+ if (flags & ZLOG_TS_UTC) {
+ msg->ts_zonetail[0] = 'Z';
+ msg->ts_zonetail[1] = '\0';
+ } else
+ snprintfrr(msg->ts_zonetail, sizeof(msg->ts_zonetail),
+ "%+03d:%02d",
+ (int)(tm.tm_gmtoff / 3600),
+ (int)(labs(tm.tm_gmtoff) / 60) % 60);
+
+ msg->ts_dot = msg->ts_str + strlen(msg->ts_str);
+ snprintfrr(msg->ts_dot,
+ msg->ts_str + sizeof(msg->ts_str) - msg->ts_dot,
+ ".%09lu", (unsigned long)msg->ts.tv_nsec);
+
+ msg->ts_flags = ZLOG_TS_ISO8601 | (flags & ZLOG_TS_UTC);
+ }
+
+ len1 = flags & ZLOG_TS_PREC;
+ len1 = (msg->ts_dot - msg->ts_str) + (len1 ? len1 + 1 : 0);
+
+ if (len1 > strlen(msg->ts_str))
+ len1 = strlen(msg->ts_str);
+
+ if (flags & ZLOG_TS_LEGACY) {
+ if (!out)
+ return len1;
+
+ if (len1 > outsz) {
+ memset(out->pos, 0, outsz);
+ out->pos += outsz;
+ return len1;
+ }
+
+ /* just swap out the formatting, faster than redoing it */
+ for (char *p = msg->ts_str; p < msg->ts_str + len1; p++) {
+ switch (*p) {
+ case '-':
+ *out->pos++ = '/';
+ break;
+ case 'T':
+ *out->pos++ = ' ';
+ break;
+ default:
+ *out->pos++ = *p;
+ }
+ }
+ return len1;
+ } else {
+ size_t len2 = strlen(msg->ts_zonetail);
+
+ if (!out)
+ return len1 + len2;
+
+ if (len1 + len2 > outsz) {
+ memset(out->pos, 0, outsz);
+ out->pos += outsz;
+ return len1 + len2;
+ }
+
+ memcpy(out->pos, msg->ts_str, len1);
+ out->pos += len1;
+ memcpy(out->pos, msg->ts_zonetail, len2);
+ out->pos += len2;
+ return len1 + len2;
+ }
+}
+
+size_t zlog_msg_ts_3164(struct zlog_msg *msg, struct fbuf *out, uint32_t flags)
+{
+ flags &= ZLOG_TS_UTC;
+
+ if (!msg->ts_3164_str[0] || flags != msg->ts_3164_flags) {
+ /* these are "hardcoded" in RFC3164, so they're here too... */
+ static const char *const months[12] = {
+ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
+ "Jul", "Aug", "Sep", "Oct", "Nov", "Dec",
+ };
+ struct tm tm;
+
+ /* RFC3164 explicitly asks for local time, but common usage
+ * also includes UTC.
+ */
+ if (flags & ZLOG_TS_UTC)
+ gmtime_r(&msg->ts.tv_sec, &tm);
+ else
+ localtime_r(&msg->ts.tv_sec, &tm);
+
+ snprintfrr(msg->ts_3164_str, sizeof(msg->ts_3164_str),
+ "%3s %2d %02d:%02d:%02d", months[tm.tm_mon],
+ tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec);
+
+ msg->ts_3164_flags = flags;
+ }
+ return bputs(out, msg->ts_3164_str);
+}
+
+void zlog_msg_tsraw(struct zlog_msg *msg, struct timespec *ts)
+{
+ memcpy(ts, &msg->ts, sizeof(*ts));
+}
+
+void zlog_set_prefix_ec(bool enable)
+{
+ atomic_store_explicit(&zlog_ec, enable, memory_order_relaxed);
+}
+
+bool zlog_get_prefix_ec(void)
+{
+ return atomic_load_explicit(&zlog_ec, memory_order_relaxed);
+}
+
+void zlog_set_prefix_xid(bool enable)
+{
+ atomic_store_explicit(&zlog_xid, enable, memory_order_relaxed);
+}
+
+bool zlog_get_prefix_xid(void)
+{
+ return atomic_load_explicit(&zlog_xid, memory_order_relaxed);
+}
+
+/* setup functions */
+
+struct zlog_target *zlog_target_clone(struct memtype *mt,
+ struct zlog_target *oldzt, size_t size)
+{
+ struct zlog_target *newzt;
+
+ newzt = XCALLOC(mt, size);
+ if (oldzt) {
+ newzt->prio_min = oldzt->prio_min;
+ newzt->logfn = oldzt->logfn;
+ newzt->logfn_sigsafe = oldzt->logfn_sigsafe;
+ }
+
+ return newzt;
+}
+
+struct zlog_target *zlog_target_replace(struct zlog_target *oldzt,
+ struct zlog_target *newzt)
+{
+ if (newzt)
+ zlog_targets_add_tail(&zlog_targets, newzt);
+ if (oldzt)
+ zlog_targets_del(&zlog_targets, oldzt);
+ return oldzt;
+}
+
+/*
+ * Enable or disable 'immediate' output - default is to buffer
+ * each pthread's messages.
+ */
+void zlog_set_immediate(bool set_p)
+{
+ default_immediate = set_p;
+}
+
+/* common init */
+
+#define TMPBASEDIR "/var/tmp/frr"
+
+static char zlog_tmpdir[MAXPATHLEN];
+
+void zlog_aux_init(const char *prefix, int prio_min)
+{
+ if (prefix)
+ strlcpy(zlog_prefix, prefix, sizeof(zlog_prefix));
+
+ hook_call(zlog_aux_init, prefix, prio_min);
+}
+
+void zlog_init(const char *progname, const char *protoname,
+ unsigned short instance, uid_t uid, gid_t gid)
+{
+ zlog_uid = uid;
+ zlog_gid = gid;
+ zlog_instance = instance;
+
+ if (instance) {
+ snprintfrr(zlog_tmpdir, sizeof(zlog_tmpdir), "%s/%s-%d.%ld",
+ TMPBASEDIR, progname, instance, (long)getpid());
+
+ zlog_prefixsz = snprintfrr(zlog_prefix, sizeof(zlog_prefix),
+ "%s[%d]: ", protoname, instance);
+ } else {
+ snprintfrr(zlog_tmpdir, sizeof(zlog_tmpdir), "%s/%s.%ld",
+ TMPBASEDIR, progname, (long)getpid());
+
+ zlog_prefixsz = snprintfrr(zlog_prefix, sizeof(zlog_prefix),
+ "%s: ", protoname);
+ }
+
+ if (mkdir(TMPBASEDIR, 0700) != 0) {
+ if (errno != EEXIST) {
+ zlog_err("failed to mkdir \"%s\": %s",
+ TMPBASEDIR, strerror(errno));
+ goto out_warn;
+ }
+ }
+ chown(TMPBASEDIR, zlog_uid, zlog_gid);
+
+ if (mkdir(zlog_tmpdir, 0700) != 0) {
+ zlog_err("failed to mkdir \"%s\": %s",
+ zlog_tmpdir, strerror(errno));
+ goto out_warn;
+ }
+
+#ifdef O_PATH
+ zlog_tmpdirfd = open(zlog_tmpdir,
+ O_PATH | O_RDONLY | O_CLOEXEC);
+#else
+ zlog_tmpdirfd = open(zlog_tmpdir,
+ O_DIRECTORY | O_RDONLY | O_CLOEXEC);
+#endif
+ if (zlog_tmpdirfd < 0) {
+ zlog_err("failed to open \"%s\": %s",
+ zlog_tmpdir, strerror(errno));
+ goto out_warn;
+ }
+
+#ifdef AT_EMPTY_PATH
+ fchownat(zlog_tmpdirfd, "", zlog_uid, zlog_gid, AT_EMPTY_PATH);
+#else
+ chown(zlog_tmpdir, zlog_uid, zlog_gid);
+#endif
+
+ hook_call(zlog_init, progname, protoname, instance, uid, gid);
+ return;
+
+out_warn:
+ zlog_err("crashlog and per-thread log buffering unavailable!");
+ hook_call(zlog_init, progname, protoname, instance, uid, gid);
+}
+
+void zlog_fini(void)
+{
+ hook_call(zlog_fini);
+
+ if (zlog_tmpdirfd >= 0) {
+ close(zlog_tmpdirfd);
+ zlog_tmpdirfd = -1;
+
+ if (rmdir(zlog_tmpdir))
+ zlog_err("failed to rmdir \"%s\": %s",
+ zlog_tmpdir, strerror(errno));
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-01 10:12:43 +0000