1 files changed, 120 insertions, 0 deletions

diff --git a/src/fnettrace/hostnames.c b/src/fnettrace/hostnames.c
new file mode 100644
index 000000000..e5fbb6d20
--- /dev/null
+++ b/src/fnettrace/hostnames.c
@@ -0,0 +1,120 @@
+/*
+ * Copyright (C) 2014-2021 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 "fnettrace.h"
+#include "radix.h"
+#define MAXBUF 1024
+
+
+char *retrieve_hostname(uint32_t ip) {
+        char *rv = NULL;
+        char *cmd;
+        if (asprintf(&cmd, "/usr/bin/geoiplookup %d.%d.%d.%d", PRINT_IP(ip)) == -1)
+                errExit("asprintf");
+
+        FILE *fp = popen(cmd, "r");
+        if (fp) {
+                char *ptr;
+                char buf[MAXBUF];
+                 if (fgets(buf, MAXBUF, fp)) {
+                        ptr = strchr(buf, '\n');
+                        if (ptr)
+                                *ptr = '\0';
+                        if (strncmp(buf, "GeoIP Country Edition:", 22) == 0) {
+                                ptr = buf + 22;
+                                if (*ptr == ' ' && *(ptr + 3) == ',' &&  *(ptr + 4) == ' ') {
+                                        rv = ptr + 5;
+                                        radix_add(ip, 0xffffffff, ptr + 5);
+                                }
+                        }
+                }
+                fclose(fp);
+                return rv;
+        }
+
+        return NULL;
+}
+
+void load_hostnames(const char *fname) {
+        assert(fname);
+        FILE *fp = fopen(fname, "r");
+        if (!fp) {
+                fprintf(stderr, "Warning: cannot find %s file\n", fname);
+                return;
+        }
+
+        char buf[MAXBUF];
+        int line = 0;
+        while (fgets(buf, MAXBUF, fp)) {
+                line++;
+
+                // skip empty spaces
+                char *start = buf;
+                while (*start == ' ' || *start == '\t')
+                        start++;
+                // comments
+                if (*start == '#')
+                        continue;
+                char *end = strchr(start, '#');
+                if (end)
+                        *end = '\0';
+
+                // end
+                end = strchr(start, '\n');
+                if (end)
+                        *end = '\0';
+                end = start + strlen(start);
+                if (end == start)       // empty line
+                        continue;
+
+                // line format: 1.2.3.4/32 name_without_empty_spaces
+                // a single empty space between address and name
+                end = strchr(start, ' ');
+                if (!end)
+                        goto errexit;
+                *end = '\0';
+                end++;
+                if (*end == '\0')
+                        goto errexit;
+
+                uint32_t ip;
+                uint32_t mask;
+                if (atocidr(start, &ip, &mask)) {
+                        fprintf(stderr, "Error: invalid CIDR address\n");
+                        goto errexit;
+                }
+
+                radix_add(ip, mask, end);
+        }
+
+        fclose(fp);
+        return;
+
+
+errexit:
+        fprintf(stderr, "Error: invalid line %d in file %s\n", line, fname);
+        exit(1);
+}
+
+void build_list(const char *fname) {
+        assert(fname);
+        load_hostnames(fname);
+        radix_build_list();
+}
+