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/* libs/graphics/ports/SkFontHost_fontconfig_direct.cpp
**
** Copyright 2009, Google Inc.
**
** Licensed under the Apache License, Version 2.0 (the "License");
** you may not use this file except in compliance with the License.
** You may obtain a copy of the License at
**
** http://www.apache.org/licenses/LICENSE-2.0
**
** Unless required by applicable law or agreed to in writing, software
** distributed under the License is distributed on an "AS IS" BASIS,
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
** See the License for the specific language governing permissions and
** limitations under the License.
*/
// http://code.google.com/p/chromium/wiki/LinuxSandboxIPC
#include "SkFontHost_fontconfig_ipc.h"
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/socket.h>
#include <sys/uio.h>
FontConfigIPC::FontConfigIPC(int fd)
: fd_(fd) {
}
FontConfigIPC::~FontConfigIPC() {
close(fd_);
}
static ssize_t SyncIPC(int fd, const struct iovec* output, unsigned output_len,
int* result_fd, const struct iovec* input,
unsigned input_len) {
char cmsg_buf[CMSG_SPACE(sizeof(int))];
int fds[2];
if (socketpair(AF_UNIX, SOCK_DGRAM, 0, fds) == -1)
return false;
struct msghdr msg = {0};
msg.msg_iov = const_cast<struct iovec*>(input);
msg.msg_iovlen = input_len;
msg.msg_control = cmsg_buf;
msg.msg_controllen = sizeof(cmsg_buf);
struct cmsghdr* cmsg = CMSG_FIRSTHDR(&msg);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
*(int *) CMSG_DATA(cmsg) = fds[1];
msg.msg_controllen = cmsg->cmsg_len;
ssize_t r;
do {
r = sendmsg(fd, &msg, 0);
} while (r == -1 && errno == EINTR);
close(fds[1]);
if (r == -1) {
close(fds[0]);
return -1;
}
memset(&msg, 0, sizeof(msg));
msg.msg_iov = const_cast<struct iovec*>(output);
msg.msg_iovlen = output_len;
msg.msg_control = cmsg_buf;
msg.msg_controllen = sizeof(cmsg_buf);
do {
r = recvmsg(fds[0], &msg, 0);
} while (r == -1 && errno == EINTR);
close(fds[0]);
if (r == -1 || msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))
return -1;
cmsg = CMSG_FIRSTHDR(&msg);
if (cmsg && cmsg->cmsg_level == SOL_SOCKET &&
cmsg->cmsg_type == SCM_RIGHTS) {
const int fd = *(int*) CMSG_DATA(cmsg);
if (!result_fd)
close(fd);
*result_fd = fd;
}
return r;
}
bool FontConfigIPC::Match(std::string* result_family,
unsigned* result_fileid,
bool fileid_valid, unsigned fileid,
const std::string& family, int is_bold,
int is_italic) {
MatchRequest request;
request.method = METHOD_MATCH;
request.fileid_valid = fileid_valid;
request.fileid = fileid;
request.is_bold = is_bold;
request.is_italic = is_italic;
if (family.size() > 255)
return false;
request.family_len = family.size();
struct iovec out_iov[2];
out_iov[0].iov_base = &request;
out_iov[0].iov_len = sizeof(request);
if (family.size()) {
out_iov[1].iov_base = const_cast<char*>(family.data());
out_iov[1].iov_len = family.size();
}
MatchReply reply;
char filename_buf[PATH_MAX];
struct iovec in_iov[2];
in_iov[0].iov_base = &reply;
in_iov[0].iov_len = sizeof(reply);
in_iov[1].iov_base = filename_buf;
in_iov[1].iov_len = sizeof(filename_buf);
const ssize_t r = SyncIPC(fd_, in_iov, 2, NULL, out_iov,
family.size() ? 2 : 1);
if (r == -1 || r < sizeof(reply))
return false;
if (reply.result == 0)
return false;
*result_fileid = reply.result_fileid;
if (r != sizeof(reply) + reply.filename_len)
return false;
if (result_family)
*result_family = std::string(filename_buf, reply.filename_len);
return true;
}
int FontConfigIPC::Open(unsigned fileid) {
OpenRequest request;
OpenReply reply;
const struct iovec out_iov = {&request, sizeof(request)};
const struct iovec in_iov = {&reply, sizeof(reply)};
int result_fd = -1;
request.method = METHOD_OPEN;
request.fileid = fileid;
const ssize_t r = SyncIPC(fd_, &in_iov, 1, &result_fd, &out_iov, 1);
if (r == -1 || r != sizeof(reply) || reply.result == 0) {
if (result_fd >= 0)
close(result_fd);
return -1;
}
return result_fd;
}
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