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libcutils: Simplify android_get_control_socket()

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1. TEMP_FAILURE_RETRY() isn't necessary with getsockname() because
it's a synchronous syscall.

2. There's no need to allocate and free a temporary buffer for the
full pathname of the socket.

Test: Manually, as follows:
    - added temporary ALOG output
    - flashed and booted a device
    - checked expected output from all system daemons
    - removed log statements

Change-Id: I4550a2d67fdffe6aff3c1050f8eeeaca0f985fb3
This commit is contained in:
Bernie Innocenti 2018-05-28 14:56:57 +09:00
parent e82401e592
commit 4351bb05ad
1 changed files with 9 additions and 13 deletions
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22
libcutils/sockets_unix.cpp
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@ -32,10 +32,6 @@
#include "android_get_control_env.h"
#ifndef TEMP_FAILURE_RETRY
#define TEMP_FAILURE_RETRY(exp) (exp) // KISS implementation
#endif
#if defined(__ANDROID__)
/* For the socket trust (credentials) check */
#include <private/android_filesystem_config.h>
@ -102,15 +98,15 @@ int android_get_control_socket(const char* name) {
// Compare to UNIX domain socket name, must match!
struct sockaddr_un addr;
socklen_t addrlen = sizeof(addr);
int ret = TEMP_FAILURE_RETRY(getsockname(fd, (struct sockaddr *)&addr, &addrlen));
int ret = getsockname(fd, (struct sockaddr*)&addr, &addrlen);
if (ret < 0) return -1;
char *path = NULL;
if (asprintf(&path, ANDROID_SOCKET_DIR "/%s", name) < 0) return -1;
if (!path) return -1;
int cmp = strcmp(addr.sun_path, path);
free(path);
if (cmp != 0) return -1;
// It is what we think it is
return fd;
constexpr char prefix[] = ANDROID_SOCKET_DIR "/";
constexpr size_t prefix_size = sizeof(prefix) - sizeof('\0');
if ((strncmp(addr.sun_path, prefix, prefix_size) == 0) &&
(strcmp(addr.sun_path + prefix_size, name) == 0)) {
// It is what we think it is
return fd;
}
return -1;
}