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-rw-r--r--compat/imsg-buffer.c507
1 files changed, 454 insertions, 53 deletions
diff --git a/compat/imsg-buffer.c b/compat/imsg-buffer.c
index 67d4c70..9aed0ed 100644
--- a/compat/imsg-buffer.c
+++ b/compat/imsg-buffer.c
@@ -1,6 +1,7 @@
-/* $OpenBSD: imsg-buffer.c,v 1.12 2019/01/20 02:50:03 bcook Exp $ */
+/* $OpenBSD: imsg-buffer.c,v 1.18 2023/12/12 15:47:41 claudio Exp $ */
/*
+ * Copyright (c) 2023 Claudio Jeker <claudio@openbsd.org>
* Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
@@ -19,9 +20,11 @@
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
+#include <arpa/inet.h>
#include <limits.h>
#include <errno.h>
+#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
@@ -29,18 +32,36 @@
#include "compat.h"
#include "imsg.h"
+#undef htobe16
+#define htobe16 htons
+#undef htobe32
+#define htobe32 htonl
+#undef htobe64
+#define htobe64 htonll
+#undef be16toh
+#define be16toh ntohs
+#undef be32toh
+#define be32toh ntohl
+#undef be64toh
+#define be64toh ntohll
+
static int ibuf_realloc(struct ibuf *, size_t);
static void ibuf_enqueue(struct msgbuf *, struct ibuf *);
static void ibuf_dequeue(struct msgbuf *, struct ibuf *);
+static void msgbuf_drain(struct msgbuf *, size_t);
struct ibuf *
ibuf_open(size_t len)
{
struct ibuf *buf;
+ if (len == 0) {
+ errno = EINVAL;
+ return (NULL);
+ }
if ((buf = calloc(1, sizeof(struct ibuf))) == NULL)
return (NULL);
- if ((buf->buf = malloc(len)) == NULL) {
+ if ((buf->buf = calloc(len, 1)) == NULL) {
free(buf);
return (NULL);
}
@@ -55,14 +76,22 @@ ibuf_dynamic(size_t len, size_t max)
{
struct ibuf *buf;
- if (max < len)
+ if (max == 0 || max < len) {
+ errno = EINVAL;
return (NULL);
+ }
- if ((buf = ibuf_open(len)) == NULL)
+ if ((buf = calloc(1, sizeof(struct ibuf))) == NULL)
return (NULL);
-
- if (max > 0)
- buf->max = max;
+ if (len > 0) {
+ if ((buf->buf = calloc(len, 1)) == NULL) {
+ free(buf);
+ return (NULL);
+ }
+ }
+ buf->size = len;
+ buf->max = max;
+ buf->fd = -1;
return (buf);
}
@@ -73,7 +102,7 @@ ibuf_realloc(struct ibuf *buf, size_t len)
unsigned char *b;
/* on static buffers max is eq size and so the following fails */
- if (buf->wpos + len > buf->max) {
+ if (len > SIZE_MAX - buf->wpos || buf->wpos + len > buf->max) {
errno = ERANGE;
return (-1);
}
@@ -87,23 +116,16 @@ ibuf_realloc(struct ibuf *buf, size_t len)
return (0);
}
-int
-ibuf_add(struct ibuf *buf, const void *data, size_t len)
-{
- if (buf->wpos + len > buf->size)
- if (ibuf_realloc(buf, len) == -1)
- return (-1);
-
- memcpy(buf->buf + buf->wpos, data, len);
- buf->wpos += len;
- return (0);
-}
-
void *
ibuf_reserve(struct ibuf *buf, size_t len)
{
void *b;
+ if (len > SIZE_MAX - buf->wpos || buf->max == 0) {
+ errno = ERANGE;
+ return (NULL);
+ }
+
if (buf->wpos + len > buf->size)
if (ibuf_realloc(buf, len) == -1)
return (NULL);
@@ -113,34 +135,416 @@ ibuf_reserve(struct ibuf *buf, size_t len)
return (b);
}
+int
+ibuf_add(struct ibuf *buf, const void *data, size_t len)
+{
+ void *b;
+
+ if ((b = ibuf_reserve(buf, len)) == NULL)
+ return (-1);
+
+ memcpy(b, data, len);
+ return (0);
+}
+
+int
+ibuf_add_ibuf(struct ibuf *buf, const struct ibuf *from)
+{
+ return ibuf_add(buf, ibuf_data(from), ibuf_size(from));
+}
+
+/* remove after tree is converted */
+int
+ibuf_add_buf(struct ibuf *buf, const struct ibuf *from)
+{
+ return ibuf_add_ibuf(buf, from);
+}
+
+int
+ibuf_add_n8(struct ibuf *buf, uint64_t value)
+{
+ uint8_t v;
+
+ if (value > UINT8_MAX) {
+ errno = EINVAL;
+ return (-1);
+ }
+ v = value;
+ return ibuf_add(buf, &v, sizeof(v));
+}
+
+int
+ibuf_add_n16(struct ibuf *buf, uint64_t value)
+{
+ uint16_t v;
+
+ if (value > UINT16_MAX) {
+ errno = EINVAL;
+ return (-1);
+ }
+ v = htobe16(value);
+ return ibuf_add(buf, &v, sizeof(v));
+}
+
+int
+ibuf_add_n32(struct ibuf *buf, uint64_t value)
+{
+ uint32_t v;
+
+ if (value > UINT32_MAX) {
+ errno = EINVAL;
+ return (-1);
+ }
+ v = htobe32(value);
+ return ibuf_add(buf, &v, sizeof(v));
+}
+
+int
+ibuf_add_n64(struct ibuf *buf, uint64_t value)
+{
+ value = htobe64(value);
+ return ibuf_add(buf, &value, sizeof(value));
+}
+
+int
+ibuf_add_h16(struct ibuf *buf, uint64_t value)
+{
+ uint16_t v;
+
+ if (value > UINT16_MAX) {
+ errno = EINVAL;
+ return (-1);
+ }
+ v = value;
+ return ibuf_add(buf, &v, sizeof(v));
+}
+
+int
+ibuf_add_h32(struct ibuf *buf, uint64_t value)
+{
+ uint32_t v;
+
+ if (value > UINT32_MAX) {
+ errno = EINVAL;
+ return (-1);
+ }
+ v = value;
+ return ibuf_add(buf, &v, sizeof(v));
+}
+
+int
+ibuf_add_h64(struct ibuf *buf, uint64_t value)
+{
+ return ibuf_add(buf, &value, sizeof(value));
+}
+
+int
+ibuf_add_zero(struct ibuf *buf, size_t len)
+{
+ void *b;
+
+ if ((b = ibuf_reserve(buf, len)) == NULL)
+ return (-1);
+ memset(b, 0, len);
+ return (0);
+}
+
void *
ibuf_seek(struct ibuf *buf, size_t pos, size_t len)
{
- /* only allowed to seek in already written parts */
- if (pos + len > buf->wpos)
+ /* only allow seeking between rpos and wpos */
+ if (ibuf_size(buf) < pos || SIZE_MAX - pos < len ||
+ ibuf_size(buf) < pos + len) {
+ errno = ERANGE;
return (NULL);
+ }
- return (buf->buf + pos);
+ return (buf->buf + buf->rpos + pos);
+}
+
+int
+ibuf_set(struct ibuf *buf, size_t pos, const void *data, size_t len)
+{
+ void *b;
+
+ if ((b = ibuf_seek(buf, pos, len)) == NULL)
+ return (-1);
+
+ memcpy(b, data, len);
+ return (0);
+}
+
+int
+ibuf_set_n8(struct ibuf *buf, size_t pos, uint64_t value)
+{
+ uint8_t v;
+
+ if (value > UINT8_MAX) {
+ errno = EINVAL;
+ return (-1);
+ }
+ v = value;
+ return (ibuf_set(buf, pos, &v, sizeof(v)));
+}
+
+int
+ibuf_set_n16(struct ibuf *buf, size_t pos, uint64_t value)
+{
+ uint16_t v;
+
+ if (value > UINT16_MAX) {
+ errno = EINVAL;
+ return (-1);
+ }
+ v = htobe16(value);
+ return (ibuf_set(buf, pos, &v, sizeof(v)));
+}
+
+int
+ibuf_set_n32(struct ibuf *buf, size_t pos, uint64_t value)
+{
+ uint32_t v;
+
+ if (value > UINT32_MAX) {
+ errno = EINVAL;
+ return (-1);
+ }
+ v = htobe32(value);
+ return (ibuf_set(buf, pos, &v, sizeof(v)));
+}
+
+int
+ibuf_set_n64(struct ibuf *buf, size_t pos, uint64_t value)
+{
+ value = htobe64(value);
+ return (ibuf_set(buf, pos, &value, sizeof(value)));
+}
+
+int
+ibuf_set_h16(struct ibuf *buf, size_t pos, uint64_t value)
+{
+ uint16_t v;
+
+ if (value > UINT16_MAX) {
+ errno = EINVAL;
+ return (-1);
+ }
+ v = value;
+ return (ibuf_set(buf, pos, &v, sizeof(v)));
+}
+
+int
+ibuf_set_h32(struct ibuf *buf, size_t pos, uint64_t value)
+{
+ uint32_t v;
+
+ if (value > UINT32_MAX) {
+ errno = EINVAL;
+ return (-1);
+ }
+ v = value;
+ return (ibuf_set(buf, pos, &v, sizeof(v)));
+}
+
+int
+ibuf_set_h64(struct ibuf *buf, size_t pos, uint64_t value)
+{
+ return (ibuf_set(buf, pos, &value, sizeof(value)));
+}
+
+void *
+ibuf_data(const struct ibuf *buf)
+{
+ return (buf->buf + buf->rpos);
}
size_t
-ibuf_size(struct ibuf *buf)
+ibuf_size(const struct ibuf *buf)
{
- return (buf->wpos);
+ return (buf->wpos - buf->rpos);
}
size_t
-ibuf_left(struct ibuf *buf)
+ibuf_left(const struct ibuf *buf)
{
+ if (buf->max == 0)
+ return (0);
return (buf->max - buf->wpos);
}
+int
+ibuf_truncate(struct ibuf *buf, size_t len)
+{
+ if (ibuf_size(buf) >= len) {
+ buf->wpos = buf->rpos + len;
+ return (0);
+ }
+ if (buf->max == 0) {
+ /* only allow to truncate down */
+ errno = ERANGE;
+ return (-1);
+ }
+ return ibuf_add_zero(buf, len - ibuf_size(buf));
+}
+
+void
+ibuf_rewind(struct ibuf *buf)
+{
+ buf->rpos = 0;
+}
+
void
ibuf_close(struct msgbuf *msgbuf, struct ibuf *buf)
{
ibuf_enqueue(msgbuf, buf);
}
+void
+ibuf_from_buffer(struct ibuf *buf, void *data, size_t len)
+{
+ memset(buf, 0, sizeof(*buf));
+ buf->buf = data;
+ buf->size = buf->wpos = len;
+ buf->fd = -1;
+}
+
+void
+ibuf_from_ibuf(struct ibuf *buf, const struct ibuf *from)
+{
+ ibuf_from_buffer(buf, ibuf_data(from), ibuf_size(from));
+}
+
+int
+ibuf_get(struct ibuf *buf, void *data, size_t len)
+{
+ if (ibuf_size(buf) < len) {
+ errno = EBADMSG;
+ return (-1);
+ }
+
+ memcpy(data, ibuf_data(buf), len);
+ buf->rpos += len;
+ return (0);
+}
+
+int
+ibuf_get_ibuf(struct ibuf *buf, size_t len, struct ibuf *new)
+{
+ if (ibuf_size(buf) < len) {
+ errno = EBADMSG;
+ return (-1);
+ }
+
+ ibuf_from_buffer(new, ibuf_data(buf), len);
+ buf->rpos += len;
+ return (0);
+}
+
+int
+ibuf_get_n8(struct ibuf *buf, uint8_t *value)
+{
+ return ibuf_get(buf, value, sizeof(*value));
+}
+
+int
+ibuf_get_n16(struct ibuf *buf, uint16_t *value)
+{
+ int rv;
+
+ rv = ibuf_get(buf, value, sizeof(*value));
+ *value = be16toh(*value);
+ return (rv);
+}
+
+int
+ibuf_get_n32(struct ibuf *buf, uint32_t *value)
+{
+ int rv;
+
+ rv = ibuf_get(buf, value, sizeof(*value));
+ *value = be32toh(*value);
+ return (rv);
+}
+
+int
+ibuf_get_n64(struct ibuf *buf, uint64_t *value)
+{
+ int rv;
+
+ rv = ibuf_get(buf, value, sizeof(*value));
+ *value = be64toh(*value);
+ return (rv);
+}
+
+int
+ibuf_get_h16(struct ibuf *buf, uint16_t *value)
+{
+ return ibuf_get(buf, value, sizeof(*value));
+}
+
+int
+ibuf_get_h32(struct ibuf *buf, uint32_t *value)
+{
+ return ibuf_get(buf, value, sizeof(*value));
+}
+
+int
+ibuf_get_h64(struct ibuf *buf, uint64_t *value)
+{
+ return ibuf_get(buf, value, sizeof(*value));
+}
+
+int
+ibuf_skip(struct ibuf *buf, size_t len)
+{
+ if (ibuf_size(buf) < len) {
+ errno = EBADMSG;
+ return (-1);
+ }
+
+ buf->rpos += len;
+ return (0);
+}
+
+void
+ibuf_free(struct ibuf *buf)
+{
+ if (buf == NULL)
+ return;
+ if (buf->max == 0) /* if buf lives on the stack */
+ abort(); /* abort before causing more harm */
+ if (buf->fd != -1)
+ close(buf->fd);
+ freezero(buf->buf, buf->size);
+ free(buf);
+}
+
+int
+ibuf_fd_avail(struct ibuf *buf)
+{
+ return (buf->fd != -1);
+}
+
+int
+ibuf_fd_get(struct ibuf *buf)
+{
+ int fd;
+
+ fd = buf->fd;
+ buf->fd = -1;
+ return (fd);
+}
+
+void
+ibuf_fd_set(struct ibuf *buf, int fd)
+{
+ if (buf->max == 0) /* if buf lives on the stack */
+ abort(); /* abort before causing more harm */
+ if (buf->fd != -1)
+ close(buf->fd);
+ buf->fd = fd;
+}
+
int
ibuf_write(struct msgbuf *msgbuf)
{
@@ -153,8 +557,8 @@ ibuf_write(struct msgbuf *msgbuf)
TAILQ_FOREACH(buf, &msgbuf->bufs, entry) {
if (i >= IOV_MAX)
break;
- iov[i].iov_base = buf->buf + buf->rpos;
- iov[i].iov_len = buf->wpos - buf->rpos;
+ iov[i].iov_base = ibuf_data(buf);
+ iov[i].iov_len = ibuf_size(buf);
i++;
}
@@ -178,15 +582,6 @@ again:
}
void
-ibuf_free(struct ibuf *buf)
-{
- if (buf == NULL)
- return;
- freezero(buf->buf, buf->size);
- free(buf);
-}
-
-void
msgbuf_init(struct msgbuf *msgbuf)
{
msgbuf->queued = 0;
@@ -194,7 +589,7 @@ msgbuf_init(struct msgbuf *msgbuf)
TAILQ_INIT(&msgbuf->bufs);
}
-void
+static void
msgbuf_drain(struct msgbuf *msgbuf, size_t n)
{
struct ibuf *buf, *next;
@@ -202,8 +597,8 @@ msgbuf_drain(struct msgbuf *msgbuf, size_t n)
for (buf = TAILQ_FIRST(&msgbuf->bufs); buf != NULL && n > 0;
buf = next) {
next = TAILQ_NEXT(buf, entry);
- if (buf->rpos + n >= buf->wpos) {
- n -= buf->wpos - buf->rpos;
+ if (n >= ibuf_size(buf)) {
+ n -= ibuf_size(buf);
ibuf_dequeue(msgbuf, buf);
} else {
buf->rpos += n;
@@ -225,7 +620,7 @@ int
msgbuf_write(struct msgbuf *msgbuf)
{
struct iovec iov[IOV_MAX];
- struct ibuf *buf;
+ struct ibuf *buf, *buf0 = NULL;
unsigned int i = 0;
ssize_t n;
struct msghdr msg;
@@ -241,24 +636,26 @@ msgbuf_write(struct msgbuf *msgbuf)
TAILQ_FOREACH(buf, &msgbuf->bufs, entry) {
if (i >= IOV_MAX)
break;
- iov[i].iov_base = buf->buf + buf->rpos;
- iov[i].iov_len = buf->wpos - buf->rpos;
+ if (i > 0 && buf->fd != -1)
+ break;
+ iov[i].iov_base = ibuf_data(buf);
+ iov[i].iov_len = ibuf_size(buf);
i++;
if (buf->fd != -1)
- break;
+ buf0 = buf;
}
msg.msg_iov = iov;
msg.msg_iovlen = i;
- if (buf != NULL && buf->fd != -1) {
+ if (buf0 != NULL) {
msg.msg_control = (caddr_t)&cmsgbuf.buf;
msg.msg_controllen = sizeof(cmsgbuf.buf);
cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
- *(int *)CMSG_DATA(cmsg) = buf->fd;
+ *(int *)CMSG_DATA(cmsg) = buf0->fd;
}
again:
@@ -279,9 +676,9 @@ again:
* assumption: fd got sent if sendmsg sent anything
* this works because fds are passed one at a time
*/
- if (buf != NULL && buf->fd != -1) {
- close(buf->fd);
- buf->fd = -1;
+ if (buf0 != NULL) {
+ close(buf0->fd);
+ buf0->fd = -1;
}
msgbuf_drain(msgbuf, n);
@@ -289,9 +686,17 @@ again:
return (1);
}
+uint32_t
+msgbuf_queuelen(struct msgbuf *msgbuf)
+{
+ return (msgbuf->queued);
+}
+
static void
ibuf_enqueue(struct msgbuf *msgbuf, struct ibuf *buf)
{
+ if (buf->max == 0) /* if buf lives on the stack */
+ abort(); /* abort before causing more harm */
TAILQ_INSERT_TAIL(&msgbuf->bufs, buf, entry);
msgbuf->queued++;
}
@@ -300,10 +705,6 @@ static void
ibuf_dequeue(struct msgbuf *msgbuf, struct ibuf *buf)
{
TAILQ_REMOVE(&msgbuf->bufs, buf, entry);
-
- if (buf->fd != -1)
- close(buf->fd);
-
msgbuf->queued--;
ibuf_free(buf);
}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-22 09:51:41 +0000