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/*
* Copyright (c) 2002-2014 Balabit
* Copyright (c) 1998-2013 Balázs Scheidler
* Copyright (c) 2014 Gergely Nagy
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 as published
* by the Free Software Foundation, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* As an additional exemption you are allowed to compile & link against the
* OpenSSL libraries as published by the OpenSSL project. See the file
* COPYING for details.
*
*/
#include "transport-unix-socket.h"
#include "transport/transport-socket.h"
#include "scratch-buffers.h"
#include "str-format.h"
#include "unix-credentials.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
static void G_GNUC_UNUSED
_add_nv_pair_int(LogTransportAuxData *aux, const gchar *name, gint value)
{
ScratchBuffersMarker marker;
GString *buf = scratch_buffers_alloc_and_mark(&marker);
g_string_truncate(buf, 0);
format_uint32_padded(buf, -1, 0, 10, value);
log_transport_aux_data_add_nv_pair(aux, name, buf->str);
scratch_buffers_reclaim_marked(marker);
}
static void
_format_proc_file_name(gchar *buf, gsize buflen, pid_t pid, const gchar *proc_file)
{
g_snprintf(buf, buflen, "/proc/%d/%s", pid, proc_file);
}
static gssize
_read_text_file_content(const gchar *filename, gchar *buf, gsize buflen)
{
gint fd;
gssize rc;
gssize pos = 0;
fd = open(filename, O_RDONLY);
if (fd < 0)
return -1;
rc = 1;
/* this loop leaves the last character of buf untouched, thus -1 in the
* condition and the number of bytes to be read */
while (rc > 0 && pos < buflen - 1)
{
gsize count = (buflen - 1) - pos;
rc = read(fd, buf + pos, count);
if (rc < 0)
{
close(fd);
return -1;
}
pos += rc;
}
/* zero terminate the buffer */
buf[pos] = 0;
close(fd);
return pos;
}
static gssize
_read_text_file_content_without_trailing_newline(const gchar *filename, gchar *buf, gsize buflen)
{
gssize content_len;
content_len = _read_text_file_content(filename, buf, buflen);
if (content_len <= 0)
return content_len;
if (buf[content_len - 1] == '\n')
content_len--;
buf[content_len] = 0;
return content_len;
}
static void G_GNUC_UNUSED
_add_nv_pair_proc_read_unless_unset(LogTransportAuxData *aux, const gchar *name, pid_t pid, const gchar *proc_file,
const gchar *unset_value)
{
gchar filename[64];
gchar content[4096];
gssize content_len;
_format_proc_file_name(filename, sizeof(filename), pid, proc_file);
content_len = _read_text_file_content_without_trailing_newline(filename, content, sizeof(content));
if (content_len > 0 && (!unset_value || strcmp(content, unset_value) != 0))
log_transport_aux_data_add_nv_pair(aux, name, content);
}
static void G_GNUC_UNUSED
_add_nv_pair_proc_read_argv(LogTransportAuxData *aux, const gchar *name, pid_t pid, const gchar *proc_file)
{
gchar filename[64];
gchar content[4096];
gssize content_len;
gint i;
_format_proc_file_name(filename, sizeof(filename), pid, proc_file);
content_len = _read_text_file_content(filename, content, sizeof(content));
for (i = 0; i < content_len; i++)
{
if (!g_ascii_isprint(content[i]))
content[i] = ' ';
}
if (content_len > 0)
log_transport_aux_data_add_nv_pair(aux, name, content);
}
static void G_GNUC_UNUSED
_add_nv_pair_proc_readlink(LogTransportAuxData *aux, const gchar *name, pid_t pid, const gchar *proc_file)
{
gchar filename[64];
gchar content[4096];
gssize content_len;
_format_proc_file_name(filename, sizeof(filename), pid, proc_file);
content_len = readlink(filename, content, sizeof(content));
if (content_len > 0)
{
if (content_len == sizeof(content))
content_len--;
content[content_len] = 0;
log_transport_aux_data_add_nv_pair(aux, name, content);
}
}
#if defined (CRED_PASS_SUPPORTED)
static void
_feed_aux_from_ucred(LogTransportAuxData *aux, cred_t *uc)
{
_add_nv_pair_int(aux, ".unix.pid", cred_get(uc, pid));
_add_nv_pair_int(aux, ".unix.uid", cred_get(uc, uid));
_add_nv_pair_int(aux, ".unix.gid", cred_get(uc, gid));
}
#endif
#if defined(__linux__) && defined(CRED_PASS_SUPPORTED)
static void
_feed_aux_from_procfs(LogTransportAuxData *aux, pid_t pid)
{
_add_nv_pair_proc_read_argv(aux, ".unix.cmdline", pid, "cmdline");
_add_nv_pair_proc_readlink(aux, ".unix.exe", pid, "exe");
/* NOTE: we use the names the audit subsystem does, so if in the future we'd be
* processing audit records, the nvpair names would match up. */
_add_nv_pair_proc_read_unless_unset(aux, ".audit.auid", pid, "loginuid", "4294967295");
_add_nv_pair_proc_read_unless_unset(aux, ".audit.ses", pid, "sessionid", "4294967295");
}
#elif defined(__FreeBSD__) && defined(CRED_PASS_SUPPORTED)
static void
_feed_aux_from_procfs(LogTransportAuxData *aux, pid_t pid)
{
_add_nv_pair_proc_read_argv(aux, ".unix.cmdline", pid, "cmdline");
_add_nv_pair_proc_readlink(aux, ".unix.exe", pid, "file");
}
#endif
static void
_feed_credentials_from_cmsg(LogTransportAuxData *aux, struct msghdr *msg)
{
#if defined(CRED_PASS_SUPPORTED)
struct cmsghdr *cmsg;
for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL; cmsg = CMSG_NXTHDR(msg, cmsg))
{
if (cmsg->cmsg_level == SOL_SOCKET && cmsg->cmsg_type == SCM_CREDENTIALS)
{
cred_t *uc = (cred_t *) CMSG_DATA(cmsg);
_feed_aux_from_procfs(aux, cred_get(uc, pid));
_feed_aux_from_ucred(aux, uc);
break;
}
}
#endif
}
static void
_feed_aux_from_cmsg(LogTransportAuxData *aux, struct msghdr *msg)
{
_feed_credentials_from_cmsg(aux, msg);
}
static gssize
_unix_socket_read(gint fd, gpointer buf, gsize buflen, LogTransportAuxData *aux)
{
gint rc;
struct msghdr msg;
struct iovec iov[1];
struct sockaddr_storage ss;
#if defined(SYSLOG_NG_HAVE_CTRLBUF_IN_MSGHDR)
gchar ctlbuf[32];
msg.msg_control = ctlbuf;
msg.msg_controllen = sizeof(ctlbuf);
#endif
msg.msg_name = (struct sockaddr *) &ss;
msg.msg_namelen = sizeof(ss);
msg.msg_iovlen = 1;
msg.msg_iov = iov;
iov[0].iov_base = buf;
iov[0].iov_len = buflen;
do
{
rc = recvmsg(fd, &msg, 0);
}
while (rc == -1 && errno == EINTR);
if (rc >= 0)
{
if (msg.msg_namelen && aux)
log_transport_aux_data_set_peer_addr_ref(aux, g_sockaddr_new((struct sockaddr *) &ss, msg.msg_namelen));
_feed_aux_from_cmsg(aux, &msg);
}
return rc;
}
static gssize
log_transport_unix_dgram_socket_read_method(LogTransport *s, gpointer buf, gsize buflen, LogTransportAuxData *aux)
{
gint rc;
rc = _unix_socket_read(s->fd, buf, buflen, aux);
if (rc == 0)
{
/* DGRAM sockets should never return EOF, they just need to be read again */
rc = -1;
errno = EAGAIN;
}
return rc;
}
LogTransport *
log_transport_unix_dgram_socket_new(gint fd)
{
LogTransportSocket *self = g_new0(LogTransportSocket, 1);
log_transport_dgram_socket_init_instance(self, fd);
self->super.read = log_transport_unix_dgram_socket_read_method;
return &self->super;
}
static gssize
log_transport_unix_stream_socket_read_method(LogTransport *s, gpointer buf, gsize buflen, LogTransportAuxData *aux)
{
return _unix_socket_read(s->fd, buf, buflen, aux);
}
LogTransport *
log_transport_unix_stream_socket_new(gint fd)
{
LogTransportSocket *self = g_new0(LogTransportSocket, 1);
log_transport_stream_socket_init_instance(self, fd);
self->super.read = log_transport_unix_stream_socket_read_method;
return &self->super;
}
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