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Make libcap optional.

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This commit is contained in:
Scott Anderson 2017-07-04 00:29:03 +12:00
parent 5c211e6195
commit dd40a42a99
4 changed files with 30 additions and 5 deletions
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2
CMakeLists.txt
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@ -50,7 +50,7 @@ find_package(GBM REQUIRED)
find_package(LibInput REQUIRED) find_package(LibInput REQUIRED)
find_package(XKBCommon REQUIRED) find_package(XKBCommon REQUIRED)
find_package(Udev REQUIRED) find_package(Udev REQUIRED)
find_package(Libcap REQUIRED) find_package(Libcap)
find_package(Systemd) find_package(Systemd)
include(Wayland) include(Wayland)

1
README.md
View file

@ -18,6 +18,7 @@ Install dependencies:
* libinput * libinput
* udev * udev
* systemd (optional, for logind support) * systemd (optional, for logind support)
* libcap (optional, for capability support)
* asciidoc (optional, for man pages) * asciidoc (optional, for man pages)
Run these commands: Run these commands:

10
session/CMakeLists.txt
View file

@ -1,7 +1,6 @@
include_directories( include_directories(
${WAYLAND_INCLUDE_DIR} ${WAYLAND_INCLUDE_DIR}
${DRM_INCLUDE_DIRS} ${DRM_INCLUDE_DIRS}
${Libcap_INCLUDE_DIRS}
) )
set(sources set(sources
@ -12,7 +11,6 @@ set(sources
set(libs set(libs
wlr-util wlr-util
${WAYLAND_LIBRARIES} ${WAYLAND_LIBRARIES}
${Libcap_LIBRARIES}
) )
if (SYSTEMD_FOUND) if (SYSTEMD_FOUND)
@ -24,5 +22,13 @@ if (SYSTEMD_FOUND)
list(APPEND libs ${SYSTEMD_LIBRARIES}) list(APPEND libs ${SYSTEMD_LIBRARIES})
endif () endif ()
if (Libcap_FOUND)
add_definitions(${Libcap_DEFINITIONS})
include_directories(${Libcap_INCLUDE_DIRS})
add_definitions(-DHAS_LIBCAP)
list(APPEND libs ${Libcap_LIBRARIES})
endif ()
add_library(wlr-session ${sources}) add_library(wlr-session ${sources})
target_link_libraries(wlr-session ${libs}) target_link_libraries(wlr-session ${libs})

22
session/direct.c
View file

@ -321,17 +321,35 @@ static void communicate(int sock) {
} }
static struct wlr_session *direct_session_start(struct wl_display *disp) { #ifdef HAS_LIBCAP
static bool have_permissions(void) {
cap_t cap = cap_get_proc(); cap_t cap = cap_get_proc();
cap_flag_value_t val; cap_flag_value_t val;
if (!cap || cap_get_flag(cap, CAP_SYS_ADMIN, CAP_PERMITTED, &val) || val != CAP_SET) { if (!cap || cap_get_flag(cap, CAP_SYS_ADMIN, CAP_PERMITTED, &val) || val != CAP_SET) {
wlr_log(L_ERROR, "Do not have CAP_SYS_ADMIN; cannot become DRM master"); wlr_log(L_ERROR, "Do not have CAP_SYS_ADMIN; cannot become DRM master");
cap_free(cap); cap_free(cap);
return NULL; return false;
} }
cap_free(cap); cap_free(cap);
return true;
}
#else
static bool have_permissions(void) {
if (geteuid() != 0) {
wlr_log(L_ERROR, "Do not have root privileges; cannot become DRM master");
return false;
}
return true;
}
#endif
static struct wlr_session *direct_session_start(struct wl_display *disp) {
if (!have_permissions()) {
return NULL;
}
int sock[2]; int sock[2];
if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sock) < 0) { if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, sock) < 0) {