1 files changed, 283 insertions, 0 deletions
diff --git a/usr.sbin/smtpd/table_proc.c b/usr.sbin/smtpd/table_proc.c
new file mode 100644
index 00000000..44589bd7
--- /dev/null
+++ b/usr.sbin/smtpd/table_proc.c
@@ -0,0 +1,283 @@
+/*	$OpenBSD: table_proc.c,v 1.16 2019/10/03 04:51:15 gilles Exp $	*/
+
+/*
+ * Copyright (c) 2013 Eric Faurot <eric@openbsd.org>
+ *
+ * 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 "includes.h"
+
+#include <sys/types.h>
+#include <sys/queue.h>
+#include <sys/tree.h>
+#include <sys/socket.h>
+
+#include <ctype.h>
+#include <errno.h>
+#include <event.h>
+#include <fcntl.h>
+#include <imsg.h>
+#ifdef HAVE_PATHS_H
+#include <paths.h>
+#endif
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <unistd.h>
+
+#include "smtpd.h"
+#include "log.h"
+
+struct table_proc_priv {
+	pid_t		pid;
+	struct imsgbuf	ibuf;
+};
+
+static struct imsg	 imsg;
+static size_t		 rlen;
+static char		*rdata;
+
+extern char	**environ;
+
+static void
+table_proc_call(struct table_proc_priv *p)
+{
+	ssize_t	n;
+
+	if (imsg_flush(&p->ibuf) == -1) {
+		log_warn("warn: table-proc: imsg_flush");
+		fatalx("table-proc: exiting");
+	}
+
+	while (1) {
+		if ((n = imsg_get(&p->ibuf, &imsg)) == -1) {
+			log_warn("warn: table-proc: imsg_get");
+			break;
+		}
+		if (n) {
+			rlen = imsg.hdr.len - IMSG_HEADER_SIZE;
+			rdata = imsg.data;
+
+			if (imsg.hdr.type != PROC_TABLE_OK) {
+				log_warnx("warn: table-proc: bad response");
+				break;
+			}
+			return;
+		}
+
+		if ((n = imsg_read(&p->ibuf)) == -1 && errno != EAGAIN) {
+			log_warn("warn: table-proc: imsg_read");
+			break;
+		}
+
+		if (n == 0) {
+			log_warnx("warn: table-proc: pipe closed");
+			break;
+		}
+	}
+
+	fatalx("table-proc: exiting");
+}
+
+static void
+table_proc_read(void *dst, size_t len)
+{
+	if (len > rlen) {
+		log_warnx("warn: table-proc: bad msg len");
+		fatalx("table-proc: exiting");
+	}
+
+	if (dst)
+		memmove(dst, rdata, len);
+
+	rlen -= len;
+	rdata += len;
+}
+
+static void
+table_proc_end(void)
+{
+	if (rlen) {
+		log_warnx("warn: table-proc: bogus data");
+		fatalx("table-proc: exiting");
+	}
+	imsg_free(&imsg);
+}
+
+/*
+ * API
+ */
+
+static int
+table_proc_open(struct table *table)
+{
+	struct table_proc_priv	*priv;
+	struct table_open_params op;
+	int			 fd;
+
+	priv = xcalloc(1, sizeof(*priv));
+
+	fd = fork_proc_backend("table", table->t_config, table->t_name);
+	if (fd == -1)
+		fatalx("table-proc: exiting");
+
+	imsg_init(&priv->ibuf, fd);
+
+	memset(&op, 0, sizeof op);
+	op.version = PROC_TABLE_API_VERSION;
+	(void)strlcpy(op.name, table->t_name, sizeof op.name);
+	imsg_compose(&priv->ibuf, PROC_TABLE_OPEN, 0, 0, -1, &op, sizeof op);
+
+	table_proc_call(priv);
+	table_proc_end();
+
+	table->t_handle = priv;
+
+	return (1);
+}
+
+static int
+table_proc_update(struct table *table)
+{
+	struct table_proc_priv	*priv = table->t_handle;
+	int r;
+
+	imsg_compose(&priv->ibuf, PROC_TABLE_UPDATE, 0, 0, -1, NULL, 0);
+
+	table_proc_call(priv);
+	table_proc_read(&r, sizeof(r));
+	table_proc_end();
+
+	return (r);
+}
+
+static void
+table_proc_close(struct table *table)
+{
+	struct table_proc_priv	*priv = table->t_handle;
+
+	imsg_compose(&priv->ibuf, PROC_TABLE_CLOSE, 0, 0, -1, NULL, 0);
+	if (imsg_flush(&priv->ibuf) == -1)
+		fatal("imsg_flush");
+
+	table->t_handle = NULL;
+}
+
+static int
+imsg_add_params(struct ibuf *buf)
+{
+	size_t count = 0;
+
+	if (imsg_add(buf, &count, sizeof(count)) == -1)
+		return (-1);
+
+	return (0);
+}
+
+static int
+table_proc_lookup(struct table *table, enum table_service s, const char *k, char **dst)
+{
+	struct table_proc_priv	*priv = table->t_handle;
+	struct ibuf		*buf;
+	int			 r;
+
+	buf = imsg_create(&priv->ibuf,
+	    dst ? PROC_TABLE_LOOKUP : PROC_TABLE_CHECK, 0, 0,
+	    sizeof(s) + strlen(k) + 1);
+
+	if (buf == NULL)
+		return (-1);
+	if (imsg_add(buf, &s, sizeof(s)) == -1)
+		return (-1);
+	if (imsg_add_params(buf) == -1)
+		return (-1);
+	if (imsg_add(buf, k, strlen(k) + 1) == -1)
+		return (-1);
+	imsg_close(&priv->ibuf, buf);
+
+	table_proc_call(priv);
+	table_proc_read(&r, sizeof(r));
+
+	if (r == 1 && dst) {
+		if (rlen == 0) {
+			log_warnx("warn: table-proc: empty response");
+			fatalx("table-proc: exiting");
+		}
+		if (rdata[rlen - 1] != '\0') {
+			log_warnx("warn: table-proc: not NUL-terminated");
+			fatalx("table-proc: exiting");
+		}
+		*dst = strdup(rdata);
+		if (*dst == NULL)
+			r = -1;
+		table_proc_read(NULL, rlen);
+	}
+
+	table_proc_end();
+
+	return (r);
+}
+
+static int
+table_proc_fetch(struct table *table, enum table_service s, char **dst)
+{
+	struct table_proc_priv	*priv = table->t_handle;
+	struct ibuf		*buf;
+	int			 r;
+
+	buf = imsg_create(&priv->ibuf, PROC_TABLE_FETCH, 0, 0, sizeof(s));
+	if (buf == NULL)
+		return (-1);
+	if (imsg_add(buf, &s, sizeof(s)) == -1)
+		return (-1);
+	if (imsg_add_params(buf) == -1)
+		return (-1);
+	imsg_close(&priv->ibuf, buf);
+
+	table_proc_call(priv);
+	table_proc_read(&r, sizeof(r));
+
+	if (r == 1) {
+		if (rlen == 0) {
+			log_warnx("warn: table-proc: empty response");
+			fatalx("table-proc: exiting");
+		}
+		if (rdata[rlen - 1] != '\0') {
+			log_warnx("warn: table-proc: not NUL-terminated");
+			fatalx("table-proc: exiting");
+		}
+		*dst = strdup(rdata);
+		if (*dst == NULL)
+			r = -1;
+		table_proc_read(NULL, rlen);
+	}
+
+	table_proc_end();
+
+	return (r);
+}
+
+struct table_backend table_backend_proc = {
+	"proc",
+	K_ANY,
+	NULL,
+	NULL,
+	NULL,
+	table_proc_open,
+	table_proc_update,
+	table_proc_close,
+	table_proc_lookup,
+	table_proc_fetch,
+};