1 files changed, 59 insertions, 0 deletions

diff --git a/src/lib/common.c b/src/lib/common.c
index 8ea926df1..885f31881 100644
--- a/src/lib/common.c
+++ b/src/lib/common.c
@@ -199,3 +199,62 @@ char *pid_proc_cmdline(const pid_t pid) {
         }
         return rv;
 }
+
+// return 1 if firejail --x11 on command line
+int pid_proc_cmdline_x11(const pid_t pid) {
+        // if comm is not firejail return 0
+        char *comm = pid_proc_comm(pid);
+        if (strcmp(comm, "firejail") != 0) {
+                free(comm);
+                return 0;
+        }
+        free(comm);
+
+        // open /proc/pid/cmdline file
+        char *fname;
+        int fd;
+        if (asprintf(&fname, "/proc/%d/cmdline", pid) == -1)
+                return 0;
+        if ((fd = open(fname, O_RDONLY)) < 0) {
+                free(fname);
+                return 0;
+        }
+        free(fname);
+
+        // read file
+        unsigned char buffer[BUFLEN];
+        ssize_t len;
+        if ((len = read(fd, buffer, sizeof(buffer) - 1)) <= 0) {
+                close(fd);
+                return 0;
+        }
+        buffer[len] = '\0';
+        close(fd);
+
+        // skip the first argument
+        int i;
+        for (i = 0; buffer[i] != '\0'; i++);
+
+        // parse remaining command line options
+        while (1) {
+                // extract argument
+                i++;
+                if (i >= len)
+                        break;
+                char *arg = buffer + i;
+                
+                // detect the last command line option
+                if (strcmp(arg, "--") == 0)
+                        break;
+                if (strncmp(arg, "--", 2) != 0)
+                        break;
+                        
+                // check x11
+                if (strcmp(arg, "--x11") == 0 || strncmp(arg, "--x11=", 6) == 0)
+                        return 1;
+        }
+        return 0;
+}
+
+
+