1 files changed, 84 insertions, 0 deletions

diff --git a/src/fseccomp/syscall.c b/src/fseccomp/syscall.c
index c67d45598..e2052efde 100644
--- a/src/fseccomp/syscall.c
+++ b/src/fseccomp/syscall.c
@@ -1,3 +1,22 @@
+/*
+ * Copyright (C) 2014-2016 Firejail Authors
+ *
+ * This file is part of firejail project
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, 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 Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
 #include "fseccomp.h"
 #include <sys/syscall.h>
 
@@ -16,6 +35,29 @@ static SyscallEntry syslist[] = {
 //
 }; // end of syslist
 
+// return -1 if error, or syscall number
+int syscall_find_name(const char *name) {
+        int i;
+        int elems = sizeof(syslist) / sizeof(syslist[0]);
+        for (i = 0; i < elems; i++) {
+                if (strcmp(name, syslist[i].name) == 0)
+                        return syslist[i].nr;
+        }
+        
+        return -1;
+}
+
+char *syscall_find_nr(int nr) {
+        int i;
+        int elems = sizeof(syslist) / sizeof(syslist[0]);
+        for (i = 0; i < elems; i++) {
+                if (nr == syslist[i].nr)
+                        return syslist[i].name;
+        }
+        
+        return "unknown";
+}
+
 void syscall_print(void) {
         int i;
         int elems = sizeof(syslist) / sizeof(syslist[0]);
@@ -24,3 +66,45 @@ void syscall_print(void) {
         }
         printf("\n");
 }
+
+// return 1 if error, 0 if OK
+int syscall_check_list(const char *slist, void (*callback)(int fd, int syscall, int arg), int fd, int arg) {
+        // don't allow empty lists
+        if (slist == NULL || *slist == '\0') {
+                fprintf(stderr, "Error: empty syscall lists are not allowed\n");
+                return -1;
+        }
+
+        // work on a copy of the string
+        char *str = strdup(slist);
+        if (!str)
+                errExit("strdup");
+
+        char *ptr = str;
+        char *start = str;
+        while (*ptr != '\0') {
+                if (islower(*ptr) || isdigit(*ptr) || *ptr == '_')
+                        ;
+                else if (*ptr == ',') {
+                        *ptr = '\0';
+                        int nr = syscall_find_name(start);
+                        if (nr == -1)
+                                fprintf(stderr, "Warning: syscall %s not found\n", start);
+                        else if (callback != NULL)
+                                callback(fd, nr, arg);
+                                
+                        start = ptr + 1;
+                }
+                ptr++;
+        }
+        if (*start != '\0') {
+                int nr = syscall_find_name(start);
+                if (nr == -1)
+                        fprintf(stderr, "Warning: syscall %s not found\n", start);
+                else if (callback != NULL)
+                        callback(fd, nr, arg);
+        }
+        
+        free(str);
+        return 0;
+}