Zero-copy FTP/HTTP Daemon compatible with all POSIX systems
| 1 | #include "ftp_path.h" |
| 2 | #include "ftp_session.h" |
| 3 | #include <stdio.h> |
| 4 | #include <stdlib.h> |
| 5 | #include <string.h> |
| 6 | #include <sys/stat.h> |
| 7 | #include <unistd.h> |
| 8 | |
| 9 | static int mkdir_p(const char *path) |
| 10 | { |
| 11 | if (mkdir(path, 0700) == 0) { |
| 12 | return 0; |
| 13 | } |
| 14 | return -1; |
| 15 | } |
| 16 | |
| 17 | int main(void) |
| 18 | { |
| 19 | char tmpl[] = "/tmp/zftpd-test-XXXXXX"; |
| 20 | char *base = mkdtemp(tmpl); |
| 21 | if (base == NULL) { |
| 22 | return 2; |
| 23 | } |
| 24 | |
| 25 | char root[FTP_PATH_MAX]; |
| 26 | (void)snprintf(root, sizeof(root), "%s/root", base); |
| 27 | if (mkdir_p(root) != 0) { |
| 28 | return 2; |
| 29 | } |
| 30 | |
| 31 | char sub[FTP_PATH_MAX]; |
| 32 | (void)snprintf(sub, sizeof(sub), "%s/sub", root); |
| 33 | if (mkdir_p(sub) != 0) { |
| 34 | return 2; |
| 35 | } |
| 36 | |
| 37 | char linkp[FTP_PATH_MAX]; |
| 38 | (void)snprintf(linkp, sizeof(linkp), "%s/out", root); |
| 39 | (void)symlink("/", linkp); |
| 40 | |
| 41 | ftp_session_t s; |
| 42 | memset(&s, 0, sizeof(s)); |
| 43 | char root_real[FTP_PATH_MAX]; |
| 44 | if (realpath(root, root_real) == NULL) { |
| 45 | return 2; |
| 46 | } |
| 47 | (void)snprintf(s.root_path, sizeof(s.root_path), "%s", root_real); |
| 48 | (void)snprintf(s.cwd, sizeof(s.cwd), "%s", root_real); |
| 49 | |
| 50 | char out[FTP_PATH_MAX]; |
| 51 | |
| 52 | ftp_error_t ok = ftp_path_resolve(&s, "sub", out, sizeof(out)); |
| 53 | if (ok != FTP_OK) { |
| 54 | return 3; |
| 55 | } |
| 56 | if (ftp_path_is_within_root(out, s.root_path) != 1) { |
| 57 | return 4; |
| 58 | } |
| 59 | |
| 60 | ftp_error_t t1 = ftp_path_resolve(&s, "../", out, sizeof(out)); |
| 61 | if (t1 != FTP_ERR_PATH_INVALID) { |
| 62 | return 5; |
| 63 | } |
| 64 | |
| 65 | ftp_error_t t2 = ftp_path_resolve(&s, "out/etc", out, sizeof(out)); |
| 66 | if (t2 != FTP_ERR_PATH_INVALID) { |
| 67 | return 6; |
| 68 | } |
| 69 | |
| 70 | unlink(linkp); |
| 71 | rmdir(sub); |
| 72 | rmdir(root); |
| 73 | rmdir(base); |
| 74 | return 0; |
| 75 | } |
| 76 |