[54124] | 1 | /* $Id: proxy_tftpd.c 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * NAT Network - TFTP server.
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| 4 | */
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| 5 |
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| 6 | /*
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[98103] | 7 | * Copyright (C) 2013-2023 Oracle and/or its affiliates.
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[54124] | 8 | *
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[96407] | 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * SPDX-License-Identifier: GPL-3.0-only
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[54124] | 26 | */
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| 27 |
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[51574] | 28 | #define LOG_GROUP LOG_GROUP_NAT_SERVICE
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| 29 |
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[47886] | 30 | #include "winutils.h"
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| 31 |
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[49016] | 32 | #include "proxy.h"
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[47886] | 33 | #include "tftp.h"
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| 34 |
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| 35 | #ifndef RT_OS_WINDOWS
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| 36 | #include <sys/types.h>
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| 37 | #include <sys/stat.h>
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| 38 | #include <errno.h>
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| 39 | #include <fcntl.h>
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| 40 | #include <stdarg.h>
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| 41 | #include <stdio.h>
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| 42 | #include <string.h>
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| 43 | #include <unistd.h>
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| 44 | #else
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| 45 | #include <sys/types.h>
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| 46 | #include <sys/stat.h>
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| 47 | #include <errno.h>
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| 48 | #include <fcntl.h>
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| 49 | #include <io.h>
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| 50 | #include <stdarg.h>
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| 51 | #include <stdio.h>
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| 52 | #include <string.h>
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| 53 |
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| 54 | # define O_RDONLY _O_RDONLY
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| 55 | # define S_ISREG(x) ((x) & _S_IFREG)
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| 56 | #endif
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| 57 |
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| 58 | #include "lwip/timers.h"
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| 59 | #include "lwip/udp.h"
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| 60 |
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| 61 | #include <iprt/string.h>
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| 62 |
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| 63 | struct xfer {
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| 64 | struct udp_pcb *pcb;
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| 65 | int fd;
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| 66 | unsigned int ack;
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| 67 | struct pbuf *pbuf;
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| 68 |
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| 69 | struct pbuf *oack;
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| 70 |
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| 71 | int rexmit;
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| 72 |
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| 73 | ipX_addr_t peer_ip;
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| 74 | u16_t peer_port;
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| 75 |
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| 76 | char *filename;
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| 77 | int octet;
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| 78 |
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| 79 | /* options */
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| 80 | unsigned int blksize;
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| 81 | int blksize_from_opt;
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| 82 |
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| 83 | unsigned int timeout;
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| 84 | int timeout_from_opt;
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| 85 |
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| 86 | off_t tsize;
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| 87 | int tsize_from_opt;
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| 88 | };
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| 89 |
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| 90 | struct tftpd {
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| 91 | struct udp_pcb *pcb;
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| 92 | char *root;
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| 93 |
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| 94 | #define TFTP_MAX_XFERS 3
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| 95 | struct xfer xfers[TFTP_MAX_XFERS];
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| 96 | };
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| 97 |
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| 98 | struct tftp_option {
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| 99 | const char *name;
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| 100 | int (*getopt)(struct xfer *, const char *);
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| 101 | int (*ackopt)(struct xfer *, char **, size_t *);
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| 102 | };
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| 103 |
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| 104 |
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| 105 | static void tftpd_recv(void *, struct udp_pcb *, struct pbuf *, ip_addr_t *, u16_t);
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| 106 |
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| 107 | static void tftpd_rrq(struct pbuf *, ip_addr_t *, u16_t);
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| 108 |
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| 109 | static void tftp_xfer_recv(void *, struct udp_pcb *, struct pbuf *, ip_addr_t *, u16_t);
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| 110 |
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| 111 | static void tftp_recv_ack(struct xfer *, u16_t);
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| 112 | static void tftp_fillbuf(struct xfer *);
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| 113 | static void tftp_send(struct xfer *);
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| 114 | static void tftp_timeout(void *);
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| 115 |
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| 116 | static struct xfer *tftp_xfer_alloc(ip_addr_t *, u16_t);
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| 117 | static int tftp_xfer_create_pcb(struct xfer *);
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| 118 | static void tftp_xfer_free(struct xfer *);
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| 119 |
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| 120 | static int tftp_parse_filename(struct xfer *, char **, size_t *);
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| 121 | static int tftp_parse_mode(struct xfer *, char **, size_t *);
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| 122 | static int tftp_parse_option(struct xfer *, char **, size_t *);
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| 123 |
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| 124 | static int tftp_opt_blksize(struct xfer *, const char *);
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| 125 | static int tftp_opt_timeout(struct xfer *, const char *);
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| 126 | static int tftp_opt_tsize(struct xfer *, const char *);
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| 127 |
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| 128 | static char *tftp_getstr(struct xfer *, const char *, char **, size_t *);
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| 129 |
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| 130 | static int tftp_ack_blksize(struct xfer *, char **, size_t *);
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| 131 | static int tftp_ack_timeout(struct xfer *, char **, size_t *);
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| 132 | static int tftp_ack_tsize(struct xfer *, char **, size_t *);
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| 133 |
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| 134 | static int tftp_add_oack(char **, size_t *, const char *, const char *, ...) __attribute__((format(printf, 4, 5)));
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| 135 |
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| 136 | static ssize_t tftp_strnlen(char *, size_t);
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| 137 |
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| 138 | static int tftp_internal_error(struct xfer *);
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| 139 | static int tftp_error(struct xfer *, u16_t, const char *, ...) __attribute__((format(printf, 3, 4)));
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| 140 | static void tftpd_error(ip_addr_t *, u16_t, u16_t, const char *, ...) __attribute__((format(printf, 4, 5)));
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| 141 | static struct pbuf *tftp_verror(u16_t, const char *, va_list);
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| 142 |
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| 143 |
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| 144 | /* const */ int report_transient_errors = 1;
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| 145 | static struct tftpd tftpd;
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| 146 |
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| 147 | static struct tftp_option tftp_options[] = {
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| 148 | { "blksize", tftp_opt_blksize, tftp_ack_blksize }, /* RFC 2348 */
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| 149 | { "timeout", tftp_opt_timeout, tftp_ack_timeout }, /* RFC 2349 */
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| 150 | { "tsize", tftp_opt_tsize, tftp_ack_tsize }, /* RFC 2349 */
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| 151 | { NULL, NULL, NULL }
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| 152 | };
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| 153 |
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| 154 |
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| 155 | err_t
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| 156 | tftpd_init(struct netif *proxy_netif, const char *tftproot)
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| 157 | {
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| 158 | size_t len;
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| 159 | err_t error;
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| 160 |
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| 161 | tftpd.root = strdup(tftproot);
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| 162 | if (tftpd.root == NULL) {
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| 163 | DPRINTF0(("%s: failed to allocate tftpd.root\n", __func__));
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| 164 | return ERR_MEM;
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| 165 | }
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| 166 |
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| 167 | len = strlen(tftproot);
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| 168 | if (tftpd.root[len - 1] == '/') {
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| 169 | tftpd.root[len - 1] = '\0';
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| 170 | }
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| 171 |
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| 172 | tftpd.pcb = udp_new();
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| 173 | if (tftpd.pcb == NULL) {
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| 174 | DPRINTF0(("%s: failed to allocate PCB\n", __func__));
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| 175 | return ERR_MEM;
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| 176 | }
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| 177 |
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| 178 | udp_recv(tftpd.pcb, tftpd_recv, NULL);
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| 179 |
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| 180 | error = udp_bind(tftpd.pcb, &proxy_netif->ip_addr, TFTP_SERVER_PORT);
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| 181 | if (error != ERR_OK) {
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| 182 | DPRINTF0(("%s: failed to bind PCB\n", __func__));
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| 183 | return error;
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| 184 | }
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| 185 |
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| 186 | return ERR_OK;
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| 187 | }
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| 188 |
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| 189 |
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| 190 | static void
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| 191 | tftpd_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p,
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| 192 | ip_addr_t *addr, u16_t port)
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| 193 | {
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| 194 | u16_t op;
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| 195 |
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| 196 | LWIP_ASSERT1(pcb == tftpd.pcb);
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| 197 |
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| 198 | LWIP_UNUSED_ARG(pcb); /* only in assert */
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| 199 | LWIP_UNUSED_ARG(arg);
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| 200 |
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| 201 | if (pbuf_clen(p) > 1) { /* this code assumes contiguous aligned payload */
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| 202 | pbuf_free(p);
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| 203 | return;
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| 204 | }
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| 205 |
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| 206 | op = ntohs(*(u16_t *)p->payload);
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| 207 | switch (op) {
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| 208 | case TFTP_RRQ:
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| 209 | tftpd_rrq(p, addr, port);
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| 210 | break;
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| 211 |
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| 212 | case TFTP_WRQ:
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| 213 | tftpd_error(addr, port, TFTP_EACCESS, "Permission denied");
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| 214 | break;
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| 215 |
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| 216 | default:
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| 217 | tftpd_error(addr, port, TFTP_ENOSYS, "Bad opcode %d", op);
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| 218 | break;
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| 219 | }
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| 220 |
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| 221 | pbuf_free(p);
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| 222 | }
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| 223 |
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| 224 |
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| 225 | /**
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| 226 | * Parse Read Request packet and start new transfer.
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| 227 | */
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| 228 | static void
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| 229 | tftpd_rrq(struct pbuf *p, ip_addr_t *addr, u16_t port)
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| 230 | {
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| 231 | struct xfer *xfer;
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| 232 | char *s;
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| 233 | size_t len;
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| 234 | int has_options;
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| 235 | int status;
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| 236 |
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| 237 | xfer = tftp_xfer_alloc(addr, port);
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| 238 | if (xfer == NULL) {
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| 239 | return;
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| 240 | }
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| 241 |
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| 242 | /* skip opcode */
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| 243 | s = (char *)p->payload + sizeof(u16_t);
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| 244 | len = p->len - sizeof(u16_t);
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| 245 |
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| 246 |
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| 247 | /*
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| 248 | * Parse RRQ:
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| 249 | * filename, mode, [opt1, value1, [...] ]
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| 250 | */
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| 251 | status = tftp_parse_filename(xfer, &s, &len);
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| 252 | if (status < 0) {
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| 253 | goto terminate;
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| 254 | }
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| 255 |
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| 256 | status = tftp_parse_mode(xfer, &s, &len);
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| 257 | if (status < 0) {
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| 258 | goto terminate;
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| 259 | }
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| 260 |
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| 261 | has_options = 0;
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| 262 | while (len > 0) {
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| 263 | status = tftp_parse_option(xfer, &s, &len);
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| 264 | if (status < 0) {
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| 265 | goto terminate;
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| 266 | }
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| 267 | has_options += status;
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| 268 | }
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| 269 |
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| 270 |
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| 271 | /*
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| 272 | * Create OACK packet if necessary.
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| 273 | */
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| 274 | if (has_options) {
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| 275 | xfer->oack = pbuf_alloc(PBUF_RAW, 128, PBUF_RAM);
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| 276 | if (xfer->oack != NULL) {
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| 277 | struct tftp_option *o;
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| 278 |
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| 279 | ((u16_t *)xfer->oack->payload)[0] = PP_HTONS(TFTP_OACK);
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| 280 |
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| 281 | s = (char *)xfer->oack->payload + sizeof(u16_t);
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| 282 | len = xfer->oack->len - sizeof(u16_t);
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| 283 |
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| 284 | for (o = &tftp_options[0]; o->name != NULL; ++o) {
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| 285 | status = (*o->ackopt)(xfer, &s, &len);
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| 286 | if (status < 0) {
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| 287 | pbuf_free(xfer->oack);
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| 288 | xfer->oack = NULL;
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| 289 | break;
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| 290 | }
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| 291 | }
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| 292 |
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| 293 | if (xfer->oack != NULL) {
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[63279] | 294 | Assert((u16_t)(xfer->oack->len - len) == xfer->oack->len - len);
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| 295 | pbuf_realloc(xfer->oack, (u16_t)(xfer->oack->len - len));
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[47886] | 296 | }
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| 297 | }
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| 298 | }
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| 299 |
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| 300 |
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| 301 | /*
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| 302 | * Create static pbuf that will be used for all data packets.
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| 303 | */
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| 304 | xfer->pbuf = pbuf_alloc(PBUF_RAW, xfer->blksize + 4, PBUF_RAM);
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| 305 | if (xfer->pbuf == NULL) {
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| 306 | tftp_internal_error(xfer);
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| 307 | goto terminate;
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| 308 | }
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| 309 | ((u16_t *)xfer->pbuf->payload)[0] = PP_HTONS(TFTP_DATA);
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| 310 |
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| 311 |
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| 312 | /*
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| 313 | * Finally, create PCB. Before this point any error was reported
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| 314 | * from the server port (see tftp_error() for the reason).
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| 315 | */
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| 316 | status = tftp_xfer_create_pcb(xfer);
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| 317 | if (status < 0) {
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| 318 | goto terminate;
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| 319 | }
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| 320 |
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| 321 | if (xfer->oack) {
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| 322 | tftp_send(xfer);
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| 323 | }
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| 324 | else {
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| 325 | /* trigger send of the first data packet */
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| 326 | tftp_recv_ack(xfer, 0);
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| 327 | }
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| 328 |
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| 329 | return;
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| 330 |
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| 331 | terminate:
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| 332 | DPRINTF(("%s: terminated", __func__));
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| 333 | tftp_xfer_free(xfer);
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| 334 | }
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| 335 |
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| 336 |
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| 337 | static void
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| 338 | tftp_xfer_recv(void *arg, struct udp_pcb *pcb, struct pbuf *p,
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| 339 | ip_addr_t *addr, u16_t port)
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| 340 | {
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| 341 | struct xfer *xfer = (struct xfer *)arg;
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| 342 | u16_t op;
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| 343 |
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| 344 | LWIP_UNUSED_ARG(pcb); /* assert only */
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| 345 | LWIP_UNUSED_ARG(addr);
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| 346 | LWIP_UNUSED_ARG(port);
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| 347 |
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| 348 | LWIP_ASSERT1(xfer->pcb == pcb);
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| 349 |
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| 350 | if (p->len < 2) {
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| 351 | tftp_error(xfer, TFTP_ENOSYS, "Short packet");
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| 352 | tftp_xfer_free(xfer);
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| 353 | pbuf_free(p);
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| 354 | return;
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| 355 | }
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| 356 |
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| 357 | op = ntohs(*(u16_t *)p->payload);
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| 358 | if (op == TFTP_ACK) {
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| 359 | u16_t ack;
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| 360 |
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| 361 | if (p->len < 4) {
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| 362 | tftp_error(xfer, TFTP_ENOSYS, "Short packet");
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| 363 | tftp_xfer_free(xfer);
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| 364 | pbuf_free(p);
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| 365 | return;
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| 366 | }
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| 367 |
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| 368 | ack = ntohs(((u16_t *)p->payload)[1]);
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| 369 | tftp_recv_ack(xfer, ack);
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| 370 | }
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| 371 | else if (op == TFTP_ERROR) {
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| 372 | tftp_xfer_free(xfer);
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| 373 | }
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| 374 | else {
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| 375 | tftp_error(xfer, TFTP_ENOSYS, "Unexpected opcode %d", op);
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| 376 | tftp_xfer_free(xfer);
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| 377 | }
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| 378 |
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| 379 | pbuf_free(p);
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| 380 | }
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| 381 |
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| 382 |
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| 383 | static void
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| 384 | tftp_recv_ack(struct xfer *xfer, u16_t ack)
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| 385 | {
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| 386 | if (ack != (u16_t)xfer->ack) {
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| 387 | DPRINTF2(("%s: expect %u (%u), got %u\n",
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| 388 | __func__, (u16_t)xfer->ack, xfer->ack, ack));
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| 389 | return;
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| 390 | }
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| 391 |
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| 392 | sys_untimeout(tftp_timeout, xfer);
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| 393 | xfer->rexmit = 0;
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| 394 |
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| 395 | if (xfer->pbuf->len < xfer->blksize) {
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| 396 | DPRINTF(("%s: got final ack %u (%u)\n",
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| 397 | __func__, (u16_t)xfer->ack, xfer->ack));
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| 398 | tftp_xfer_free(xfer);
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| 399 | return;
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| 400 | }
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| 401 |
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| 402 | if (xfer->oack != NULL) {
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| 403 | pbuf_free(xfer->oack);
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| 404 | xfer->oack = NULL;
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| 405 | }
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| 406 |
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| 407 | ++xfer->ack;
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| 408 | tftp_fillbuf(xfer);
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| 409 | tftp_send(xfer);
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| 410 | }
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| 411 |
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| 412 |
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| 413 | static void
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| 414 | tftp_send(struct xfer *xfer)
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| 415 | {
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| 416 | struct pbuf *pbuf;
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| 417 |
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| 418 | pbuf = xfer->oack ? xfer->oack : xfer->pbuf;
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| 419 | udp_send(xfer->pcb, pbuf);
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| 420 | sys_timeout(xfer->timeout * 1000, tftp_timeout, xfer);
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| 421 | }
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| 422 |
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| 423 |
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| 424 | static void
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| 425 | tftp_timeout(void *arg)
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| 426 | {
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| 427 | struct xfer *xfer = (struct xfer *)arg;
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| 428 | int maxrexmit;
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| 429 |
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| 430 | maxrexmit = xfer->timeout < 60 ? 5 : 3;
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| 431 | if (++xfer->rexmit < maxrexmit) {
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| 432 | tftp_send(xfer);
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| 433 | }
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| 434 | else {
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| 435 | tftp_xfer_free(xfer);
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| 436 | }
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| 437 | }
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| 438 |
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| 439 |
|
---|
| 440 | static void
|
---|
| 441 | tftp_fillbuf(struct xfer *xfer)
|
---|
| 442 | {
|
---|
| 443 | ssize_t nread;
|
---|
| 444 |
|
---|
| 445 | DPRINTF2(("%s: reading block %u\n", __func__, xfer->ack));
|
---|
| 446 |
|
---|
| 447 | ((u16_t *)xfer->pbuf->payload)[1] = htons(xfer->ack);
|
---|
| 448 | nread = read(xfer->fd, (char *)xfer->pbuf->payload + 4, xfer->blksize);
|
---|
| 449 |
|
---|
| 450 | if (nread < 0) {
|
---|
| 451 | tftp_error(xfer, TFTP_EUNDEF, "Read failed");
|
---|
| 452 | return;
|
---|
| 453 | }
|
---|
| 454 |
|
---|
| 455 | pbuf_realloc(xfer->pbuf, nread + 4);
|
---|
| 456 | }
|
---|
| 457 |
|
---|
| 458 |
|
---|
| 459 | /**
|
---|
| 460 | * Find a free transfer slot (without a pcb). Record peer's IP
|
---|
| 461 | * address and port, but don't allocate a pcb yet.
|
---|
| 462 | *
|
---|
| 463 | * We delay creation of the pcb in response to the original request
|
---|
| 464 | * until the request is verified and accepted. This makes using
|
---|
| 465 | * tcpdump(8) easier, since tcpdump does not track TFTP transfers, so
|
---|
| 466 | * an error reply from a new pcb is not recognized as such and is not
|
---|
| 467 | * decoded as TFTP (see tftp_error()).
|
---|
| 468 | *
|
---|
| 469 | * If the request is rejected, the pcb remains NULL and the transfer
|
---|
| 470 | * slot remains unallocated. Since all TFTP processing happens on the
|
---|
| 471 | * lwIP thread, there's no concurrent processing, so we don't need to
|
---|
| 472 | * "lock" the transfer slot until the pcb is allocated.
|
---|
| 473 | */
|
---|
| 474 | static struct xfer *
|
---|
| 475 | tftp_xfer_alloc(ip_addr_t *addr, u16_t port)
|
---|
| 476 | {
|
---|
| 477 | struct xfer *xfer;
|
---|
| 478 | int i;
|
---|
| 479 |
|
---|
| 480 | /* Find free xfer slot */
|
---|
| 481 | xfer = NULL;
|
---|
| 482 | for (i = 0; i < TFTP_MAX_XFERS; ++i) {
|
---|
| 483 | if (tftpd.xfers[i].pcb == NULL) {
|
---|
| 484 | xfer = &tftpd.xfers[i];
|
---|
| 485 | break;
|
---|
| 486 | }
|
---|
| 487 | }
|
---|
| 488 |
|
---|
| 489 | if (xfer == NULL) {
|
---|
| 490 | if (report_transient_errors) {
|
---|
| 491 | tftpd_error(addr, port, TFTP_EUNDEF,
|
---|
| 492 | "Maximum number of simultaneous connections exceeded");
|
---|
| 493 | }
|
---|
| 494 | return NULL;
|
---|
| 495 | }
|
---|
| 496 |
|
---|
| 497 | ipX_addr_copy(0, xfer->peer_ip, *ip_2_ipX(addr));
|
---|
| 498 | xfer->peer_port = port;
|
---|
| 499 |
|
---|
| 500 | xfer->ack = 0;
|
---|
| 501 |
|
---|
| 502 | xfer->pbuf = NULL;
|
---|
| 503 | xfer->oack = NULL;
|
---|
| 504 | xfer->rexmit = 0;
|
---|
| 505 |
|
---|
| 506 | xfer->blksize = 512;
|
---|
| 507 | xfer->blksize_from_opt = 0;
|
---|
| 508 |
|
---|
| 509 | xfer->timeout = 1;
|
---|
| 510 | xfer->timeout_from_opt = 0;
|
---|
| 511 |
|
---|
| 512 | xfer->tsize = -1;
|
---|
| 513 | xfer->tsize_from_opt = 0;
|
---|
| 514 |
|
---|
| 515 | return xfer;
|
---|
| 516 | }
|
---|
| 517 |
|
---|
| 518 |
|
---|
| 519 | static int
|
---|
| 520 | tftp_xfer_create_pcb(struct xfer *xfer)
|
---|
| 521 | {
|
---|
| 522 | struct udp_pcb *pcb;
|
---|
| 523 | err_t error;
|
---|
| 524 |
|
---|
| 525 | pcb = udp_new();
|
---|
| 526 |
|
---|
| 527 | /* Bind */
|
---|
| 528 | if (pcb != NULL) {
|
---|
| 529 | error = udp_bind(pcb, ipX_2_ip(&tftpd.pcb->local_ip), 0);
|
---|
| 530 | if (error != ERR_OK) {
|
---|
| 531 | udp_remove(pcb);
|
---|
| 532 | pcb = NULL;
|
---|
| 533 | }
|
---|
| 534 | }
|
---|
| 535 |
|
---|
| 536 | /* Connect */
|
---|
| 537 | if (pcb != NULL) {
|
---|
| 538 | error = udp_connect(pcb, ipX_2_ip(&xfer->peer_ip), xfer->peer_port);
|
---|
| 539 | if (error != ERR_OK) {
|
---|
| 540 | udp_remove(pcb);
|
---|
| 541 | pcb = NULL;
|
---|
| 542 | }
|
---|
| 543 | }
|
---|
| 544 |
|
---|
| 545 | if (pcb == NULL) {
|
---|
| 546 | if (report_transient_errors) {
|
---|
| 547 | tftp_error(xfer, TFTP_EUNDEF, "Failed to create connection");
|
---|
| 548 | }
|
---|
| 549 | return -1;
|
---|
| 550 | }
|
---|
| 551 |
|
---|
| 552 | xfer->pcb = pcb;
|
---|
| 553 | udp_recv(xfer->pcb, tftp_xfer_recv, xfer);
|
---|
| 554 |
|
---|
| 555 | return 0;
|
---|
| 556 | }
|
---|
| 557 |
|
---|
| 558 |
|
---|
| 559 | static void
|
---|
| 560 | tftp_xfer_free(struct xfer *xfer)
|
---|
| 561 | {
|
---|
| 562 | sys_untimeout(tftp_timeout, xfer);
|
---|
| 563 |
|
---|
| 564 | if (xfer->pcb != NULL) {
|
---|
| 565 | udp_remove(xfer->pcb);
|
---|
| 566 | xfer->pcb = NULL;
|
---|
| 567 | }
|
---|
| 568 |
|
---|
| 569 | if (xfer->fd > 0) {
|
---|
| 570 | close(xfer->fd);
|
---|
| 571 | xfer->fd = -1;
|
---|
| 572 | }
|
---|
| 573 |
|
---|
| 574 | if (xfer->oack != NULL) {
|
---|
| 575 | pbuf_free(xfer->oack);
|
---|
| 576 | xfer->oack = NULL;
|
---|
| 577 | }
|
---|
| 578 |
|
---|
| 579 | if (xfer->pbuf != NULL) {
|
---|
| 580 | pbuf_free(xfer->pbuf);
|
---|
| 581 | xfer->pbuf = NULL;
|
---|
| 582 | }
|
---|
| 583 |
|
---|
| 584 | if (xfer->filename != NULL) {
|
---|
| 585 | free(xfer->filename);
|
---|
| 586 | xfer->filename = NULL;
|
---|
| 587 | }
|
---|
| 588 | }
|
---|
| 589 |
|
---|
| 590 |
|
---|
| 591 | static int
|
---|
| 592 | tftp_parse_filename(struct xfer *xfer, char **ps, size_t *plen)
|
---|
| 593 | {
|
---|
| 594 | const char *filename;
|
---|
| 595 | struct stat st;
|
---|
| 596 | char *pathname;
|
---|
| 597 | char *s;
|
---|
| 598 | size_t len;
|
---|
| 599 | int status;
|
---|
| 600 |
|
---|
| 601 | filename = tftp_getstr(xfer, "filename", ps, plen);
|
---|
| 602 | if (filename == NULL) {
|
---|
| 603 | return -1;
|
---|
| 604 | }
|
---|
| 605 |
|
---|
| 606 | DPRINTF(("%s: requested file name: %s\n", __func__, filename));
|
---|
| 607 | xfer->filename = strdup(filename);
|
---|
| 608 | if (xfer->filename == NULL) {
|
---|
| 609 | return tftp_internal_error(xfer);
|
---|
| 610 | }
|
---|
| 611 |
|
---|
| 612 | /* replace backslashes with forward slashes */
|
---|
| 613 | s = xfer->filename;
|
---|
| 614 | while ((s = strchr(s, '\\')) != NULL) {
|
---|
| 615 | *s++ = '/';
|
---|
| 616 | }
|
---|
| 617 |
|
---|
| 618 | /* deny attempts to break out of tftp dir */
|
---|
| 619 | if (strncmp(xfer->filename, "../", 3) == 0
|
---|
| 620 | || strstr(xfer->filename, "/../") != NULL)
|
---|
| 621 | {
|
---|
| 622 | return tftp_error(xfer, TFTP_ENOENT, "Permission denied");
|
---|
| 623 | }
|
---|
| 624 |
|
---|
| 625 | len = strlen(tftpd.root) + 1 /*slash*/ + strlen(xfer->filename) + 1 /*nul*/;
|
---|
| 626 | pathname = (char *)malloc(len);
|
---|
| 627 | if (pathname == NULL) {
|
---|
| 628 | return tftp_internal_error(xfer);
|
---|
| 629 | }
|
---|
| 630 |
|
---|
[63279] | 631 | RTStrPrintf(pathname, len, "%s/%s", tftpd.root, xfer->filename);
|
---|
| 632 | /** @todo fix RTStrPrintf because this does not currently work:
|
---|
| 633 | * status = RTStrPrintf(pathname, len, "%s/%s", tftpd.root, xfer->filename);
|
---|
| 634 | * if (status < 0) {
|
---|
| 635 | * return tftp_internal_error(xfer);
|
---|
| 636 | * }
|
---|
| 637 | */
|
---|
[47886] | 638 |
|
---|
| 639 | DPRINTF(("%s: full pathname: %s\n", __func__, pathname));
|
---|
| 640 | xfer->fd = open(pathname, O_RDONLY);
|
---|
| 641 | if (xfer->fd < 0) {
|
---|
| 642 | if (errno == EPERM) {
|
---|
| 643 | return tftp_error(xfer, TFTP_ENOENT, "Permission denied");
|
---|
| 644 | }
|
---|
| 645 | else {
|
---|
| 646 | return tftp_error(xfer, TFTP_ENOENT, "File not found");
|
---|
| 647 | }
|
---|
| 648 | }
|
---|
| 649 |
|
---|
| 650 | status = fstat(xfer->fd, &st);
|
---|
| 651 | if (status < 0) {
|
---|
| 652 | return tftp_internal_error(xfer);
|
---|
| 653 | }
|
---|
| 654 |
|
---|
| 655 | if (!S_ISREG(st.st_mode)) {
|
---|
| 656 | return tftp_error(xfer, TFTP_ENOENT, "File not found");
|
---|
| 657 | }
|
---|
| 658 |
|
---|
| 659 | xfer->tsize = st.st_size;
|
---|
| 660 | return 0;
|
---|
| 661 | }
|
---|
| 662 |
|
---|
| 663 |
|
---|
| 664 | static int
|
---|
| 665 | tftp_parse_mode(struct xfer *xfer, char **ps, size_t *plen)
|
---|
| 666 | {
|
---|
| 667 | const char *modename;
|
---|
| 668 |
|
---|
| 669 | modename = tftp_getstr(xfer, "mode", ps, plen);
|
---|
| 670 | if (modename == NULL) {
|
---|
| 671 | return -1;
|
---|
| 672 | }
|
---|
| 673 |
|
---|
| 674 | if (RTStrICmp(modename, "octet") == 0) {
|
---|
| 675 | xfer->octet = 1;
|
---|
| 676 | }
|
---|
| 677 | else if (RTStrICmp(modename, "netascii") == 0) {
|
---|
| 678 | xfer->octet = 0;
|
---|
| 679 | /* XXX: not (yet?) */
|
---|
| 680 | return tftp_error(xfer, TFTP_ENOSYS, "Mode \"netascii\" not supported");
|
---|
| 681 | }
|
---|
| 682 | else if (RTStrICmp(modename, "mail") == 0) {
|
---|
| 683 | return tftp_error(xfer, TFTP_ENOSYS, "Mode \"mail\" not supported");
|
---|
| 684 | }
|
---|
| 685 | else {
|
---|
| 686 | return tftp_error(xfer, TFTP_ENOSYS, "Unknown mode \"%s\"", modename);
|
---|
| 687 | }
|
---|
| 688 |
|
---|
| 689 | return 0;
|
---|
| 690 | }
|
---|
| 691 |
|
---|
| 692 |
|
---|
| 693 | static int
|
---|
| 694 | tftp_parse_option(struct xfer *xfer, char **ps, size_t *plen)
|
---|
| 695 | {
|
---|
| 696 | const char *opt;
|
---|
| 697 | const char *val;
|
---|
| 698 | struct tftp_option *o;
|
---|
| 699 |
|
---|
| 700 | opt = tftp_getstr(xfer, "option name", ps, plen);
|
---|
| 701 | if (opt == NULL) {
|
---|
| 702 | return -1;
|
---|
| 703 | }
|
---|
| 704 |
|
---|
| 705 | if (*plen == 0) {
|
---|
| 706 | return tftp_error(xfer, TFTP_EUNDEF, "Missing option value");
|
---|
| 707 | }
|
---|
| 708 |
|
---|
| 709 | val = tftp_getstr(xfer, "option value", ps, plen);
|
---|
| 710 | if (val == NULL) {
|
---|
| 711 | return -1;
|
---|
| 712 | }
|
---|
| 713 |
|
---|
| 714 | /* handle option if known, ignore otherwise */
|
---|
| 715 | for (o = &tftp_options[0]; o->name != NULL; ++o) {
|
---|
| 716 | if (RTStrICmp(o->name, opt) == 0) {
|
---|
| 717 | return (*o->getopt)(xfer, val);
|
---|
| 718 | }
|
---|
| 719 | }
|
---|
| 720 |
|
---|
| 721 | return 0; /* unknown option */
|
---|
| 722 | }
|
---|
| 723 |
|
---|
| 724 |
|
---|
| 725 | static int
|
---|
| 726 | tftp_opt_blksize(struct xfer *xfer, const char *optval)
|
---|
| 727 | {
|
---|
| 728 | char *end;
|
---|
| 729 | long blksize;
|
---|
| 730 |
|
---|
| 731 | errno = 0;
|
---|
| 732 | blksize = strtol(optval, &end, 10);
|
---|
| 733 | if (errno != 0 || *end != '\0') {
|
---|
| 734 | return 0;
|
---|
| 735 | }
|
---|
| 736 |
|
---|
| 737 | if (blksize < 8) {
|
---|
| 738 | return 0;
|
---|
| 739 | }
|
---|
| 740 |
|
---|
| 741 | if (blksize > 1428) { /* exceeds ethernet mtu */
|
---|
| 742 | blksize = 1428;
|
---|
| 743 | }
|
---|
| 744 |
|
---|
| 745 | xfer->blksize = blksize;
|
---|
| 746 | xfer->blksize_from_opt = 1;
|
---|
| 747 | return 1;
|
---|
| 748 | }
|
---|
| 749 |
|
---|
| 750 |
|
---|
| 751 | static int
|
---|
| 752 | tftp_opt_timeout(struct xfer *xfer, const char *optval)
|
---|
| 753 | {
|
---|
| 754 | LWIP_UNUSED_ARG(xfer);
|
---|
| 755 | LWIP_UNUSED_ARG(optval);
|
---|
| 756 | return 0;
|
---|
| 757 | }
|
---|
| 758 |
|
---|
| 759 |
|
---|
| 760 | static int
|
---|
| 761 | tftp_opt_tsize(struct xfer *xfer, const char *optval)
|
---|
| 762 | {
|
---|
| 763 | LWIP_UNUSED_ARG(optval); /* must be "0", but we don't check it */
|
---|
| 764 |
|
---|
| 765 | if (xfer->tsize < 0) {
|
---|
| 766 | return 0;
|
---|
| 767 | }
|
---|
| 768 |
|
---|
| 769 | xfer->tsize_from_opt = 1;
|
---|
| 770 | return 1;
|
---|
| 771 | }
|
---|
| 772 |
|
---|
| 773 |
|
---|
| 774 | static char *
|
---|
| 775 | tftp_getstr(struct xfer *xfer, const char *msg, char **ps, size_t *plen)
|
---|
| 776 | {
|
---|
| 777 | char *s;
|
---|
| 778 | ssize_t slen;
|
---|
| 779 |
|
---|
| 780 | s = *ps;
|
---|
| 781 | slen = tftp_strnlen(s, *plen);
|
---|
| 782 | if (slen < 0) {
|
---|
| 783 | tftp_error(xfer, TFTP_EUNDEF, "Unterminated %s", msg);
|
---|
| 784 | return NULL;
|
---|
| 785 | }
|
---|
| 786 |
|
---|
| 787 | *ps += slen + 1;
|
---|
| 788 | *plen -= slen + 1;
|
---|
| 789 |
|
---|
| 790 | return s;
|
---|
| 791 | }
|
---|
| 792 |
|
---|
| 793 |
|
---|
| 794 | static int
|
---|
| 795 | tftp_ack_blksize(struct xfer *xfer, char **ps, size_t *plen)
|
---|
| 796 | {
|
---|
| 797 | if (!xfer->blksize_from_opt) {
|
---|
| 798 | return 0;
|
---|
| 799 | }
|
---|
| 800 |
|
---|
| 801 | return tftp_add_oack(ps, plen, "blksize", "%u", xfer->blksize);
|
---|
| 802 | }
|
---|
| 803 |
|
---|
| 804 |
|
---|
| 805 | static int
|
---|
| 806 | tftp_ack_timeout(struct xfer *xfer, char **ps, size_t *plen)
|
---|
| 807 | {
|
---|
| 808 | if (!xfer->timeout_from_opt) {
|
---|
| 809 | return 0;
|
---|
| 810 | }
|
---|
| 811 |
|
---|
| 812 | return tftp_add_oack(ps, plen, "timeout", "%u", xfer->timeout);
|
---|
| 813 | }
|
---|
| 814 |
|
---|
| 815 |
|
---|
| 816 | static int
|
---|
| 817 | tftp_ack_tsize(struct xfer *xfer, char **ps, size_t *plen)
|
---|
| 818 | {
|
---|
| 819 | if (!xfer->tsize_from_opt) {
|
---|
| 820 | return 0;
|
---|
| 821 | }
|
---|
| 822 |
|
---|
| 823 | LWIP_ASSERT1(xfer->tsize >= 0);
|
---|
| 824 | return tftp_add_oack(ps, plen, "tsize",
|
---|
| 825 | /* XXX: FIXME: want 64 bit */
|
---|
| 826 | "%lu", (unsigned long)xfer->tsize);
|
---|
| 827 | }
|
---|
| 828 |
|
---|
| 829 |
|
---|
| 830 | static int
|
---|
| 831 | tftp_add_oack(char **ps, size_t *plen,
|
---|
| 832 | const char *optname, const char *fmt, ...)
|
---|
| 833 | {
|
---|
| 834 | va_list ap;
|
---|
| 835 | int sz;
|
---|
| 836 |
|
---|
[63279] | 837 | /** @todo Fix RTStrPrintf because this doesn't really work.
|
---|
| 838 | * sz = RTStrPrintf(*ps, *plen, "%s", optname);
|
---|
| 839 | * if (sz < 0 || (size_t)sz >= *plen) {
|
---|
| 840 | * return -1;
|
---|
| 841 | * } */
|
---|
| 842 | sz = (int)RTStrPrintf(*ps, *plen, "%s", optname);
|
---|
| 843 | if (/*sz < 0 ||*/ (size_t)sz >= *plen) {
|
---|
[47886] | 844 | return -1;
|
---|
| 845 | }
|
---|
| 846 |
|
---|
| 847 | ++sz; /* for nul byte */
|
---|
| 848 | *ps += sz;
|
---|
| 849 | *plen -= sz;
|
---|
| 850 |
|
---|
| 851 | va_start(ap, fmt);
|
---|
| 852 | sz = vsnprintf(*ps, *plen, fmt, ap);
|
---|
| 853 | va_end(ap);
|
---|
| 854 | if (sz < 0 || (size_t)sz >= *plen) {
|
---|
| 855 | return -1;
|
---|
| 856 | }
|
---|
[48956] | 857 |
|
---|
[47886] | 858 | ++sz; /* for nul byte */
|
---|
| 859 | *ps += sz;
|
---|
| 860 | *plen -= sz;
|
---|
| 861 |
|
---|
| 862 | return 0;
|
---|
| 863 | }
|
---|
| 864 |
|
---|
| 865 |
|
---|
| 866 | static ssize_t
|
---|
| 867 | tftp_strnlen(char *buf, size_t bufsize)
|
---|
| 868 | {
|
---|
| 869 | void *end;
|
---|
| 870 |
|
---|
| 871 | end = memchr(buf, '\0', bufsize);
|
---|
| 872 | if (end == NULL) {
|
---|
| 873 | return -1;
|
---|
| 874 | }
|
---|
| 875 |
|
---|
| 876 | return (char *)end - buf;
|
---|
| 877 | }
|
---|
| 878 |
|
---|
| 879 |
|
---|
| 880 | static int
|
---|
| 881 | tftp_internal_error(struct xfer *xfer)
|
---|
| 882 | {
|
---|
| 883 | if (report_transient_errors) {
|
---|
| 884 | tftp_error(xfer, TFTP_EUNDEF, "Internal error");
|
---|
| 885 | }
|
---|
| 886 | return -1;
|
---|
| 887 | }
|
---|
| 888 |
|
---|
| 889 |
|
---|
| 890 | /**
|
---|
| 891 | * Send an error packet to the peer.
|
---|
| 892 | *
|
---|
| 893 | * PCB may not be created yet in which case send the error packet from
|
---|
| 894 | * the TFTP server port (*).
|
---|
| 895 | *
|
---|
| 896 | * (*) We delay creation of the PCB in response to the original
|
---|
| 897 | * request until the request is verified and accepted. This makes
|
---|
| 898 | * using tcpdump(8) easier, since tcpdump does not track TFTP
|
---|
| 899 | * transfers, so an error reply from a new PCB is not recognized as
|
---|
| 900 | * such and is not decoded as TFTP.
|
---|
| 901 | *
|
---|
| 902 | * Always returns -1 for callers to reuse.
|
---|
| 903 | */
|
---|
| 904 | static int
|
---|
| 905 | tftp_error(struct xfer *xfer, u16_t error, const char *fmt, ...)
|
---|
| 906 | {
|
---|
| 907 | va_list ap;
|
---|
| 908 | struct pbuf *q;
|
---|
| 909 |
|
---|
| 910 | LWIP_ASSERT1(xfer != NULL);
|
---|
| 911 |
|
---|
| 912 | va_start(ap, fmt);
|
---|
| 913 | q = tftp_verror(error, fmt, ap);
|
---|
| 914 | va_end(ap);
|
---|
| 915 |
|
---|
| 916 | if (q == NULL) {
|
---|
| 917 | return -1;
|
---|
| 918 | }
|
---|
| 919 |
|
---|
| 920 | if (xfer->pcb != NULL) {
|
---|
| 921 | udp_send(xfer->pcb, q);
|
---|
| 922 | }
|
---|
| 923 | else {
|
---|
| 924 | udp_sendto(tftpd.pcb, q, ipX_2_ip(&xfer->peer_ip), xfer->peer_port);
|
---|
| 925 | }
|
---|
| 926 |
|
---|
| 927 | pbuf_free(q);
|
---|
| 928 | return -1;
|
---|
| 929 | }
|
---|
| 930 |
|
---|
| 931 |
|
---|
| 932 | /**
|
---|
| 933 | * Send an error packet from TFTP server port to the specified peer.
|
---|
| 934 | */
|
---|
| 935 | static void
|
---|
| 936 | tftpd_error(ip_addr_t *addr, u16_t port, u16_t error, const char *fmt, ...)
|
---|
| 937 | {
|
---|
| 938 | va_list ap;
|
---|
| 939 | struct pbuf *q;
|
---|
| 940 |
|
---|
| 941 | va_start(ap, fmt);
|
---|
| 942 | q = tftp_verror(error, fmt, ap);
|
---|
| 943 | va_end(ap);
|
---|
| 944 |
|
---|
| 945 | if (q != NULL) {
|
---|
| 946 | udp_sendto(tftpd.pcb, q, addr, port);
|
---|
| 947 | pbuf_free(q);
|
---|
| 948 | }
|
---|
| 949 | }
|
---|
| 950 |
|
---|
| 951 |
|
---|
| 952 | /**
|
---|
| 953 | * Create ERROR pbuf with formatted error message.
|
---|
| 954 | */
|
---|
| 955 | static struct pbuf *
|
---|
| 956 | tftp_verror(u16_t error, const char *fmt, va_list ap)
|
---|
| 957 | {
|
---|
| 958 | struct tftp_error {
|
---|
| 959 | u16_t opcode; /* TFTP_ERROR */
|
---|
| 960 | u16_t errcode;
|
---|
| 961 | char errmsg[512];
|
---|
| 962 | };
|
---|
| 963 |
|
---|
| 964 | struct pbuf *p;
|
---|
| 965 | struct tftp_error *errpkt;
|
---|
| 966 | int msgsz;
|
---|
| 967 |
|
---|
| 968 | p = pbuf_alloc(PBUF_TRANSPORT, sizeof(*errpkt), PBUF_RAM);
|
---|
| 969 | if (p == NULL) {
|
---|
| 970 | return NULL;
|
---|
| 971 | }
|
---|
| 972 |
|
---|
| 973 | errpkt = (struct tftp_error *)p->payload;
|
---|
| 974 | errpkt->opcode = PP_HTONS(TFTP_ERROR);
|
---|
| 975 | errpkt->errcode = htons(error);
|
---|
| 976 |
|
---|
| 977 | msgsz = vsnprintf(errpkt->errmsg, sizeof(errpkt->errmsg), fmt, ap);
|
---|
| 978 | if (msgsz < 0) {
|
---|
| 979 | errpkt->errmsg[0] = '\0';
|
---|
| 980 | msgsz = 1;
|
---|
| 981 | }
|
---|
| 982 | else if ((size_t)msgsz < sizeof(errpkt->errmsg)) {
|
---|
| 983 | ++msgsz; /* for nul byte */
|
---|
| 984 | }
|
---|
| 985 | else {
|
---|
| 986 | msgsz = sizeof(errpkt->errmsg); /* truncated, includes nul byte */
|
---|
| 987 | }
|
---|
| 988 |
|
---|
| 989 | pbuf_realloc(p, sizeof(*errpkt) - sizeof(errpkt->errmsg) + msgsz);
|
---|
| 990 | return p;
|
---|
| 991 | }
|
---|