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Bochs/bochs/iodev/network/slirp/tftp.cc

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/////////////////////////////////////////////////////////////////////////
// $Id$
/////////////////////////////////////////////////////////////////////////
/*
* A simple TFTP server (ported from Qemu)
* Bochs additions: write support, 'blksize' and 'timeout' options
*
* Copyright (c) 2004 Magnus Damm <damm@opensource.se>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "slirp.h"
#if BX_NETWORKING && BX_NETMOD_SLIRP
// Missing defines for open (copied from osdep.h)
#ifndef S_IRUSR
#define S_IRUSR 0400
#define S_IWUSR 0200
#endif
#ifndef S_IRGRP
#define S_IRGRP 0040
#define S_IWGRP 0020
#endif
// internal TFTP defines
#define TFTP_RRQ 1
#define TFTP_WRQ 2
#define TFTP_DATA 3
#define TFTP_ACK 4
#define TFTP_ERROR 5
#define TFTP_OPTACK 6
#define TFTP_FILENAME_MAX 512
#define TFTP_OPTION_OCTET 0x1
#define TFTP_OPTION_BLKSIZE 0x2
#define TFTP_OPTION_TSIZE 0x4
#define TFTP_OPTION_TIMEOUT 0x8
#define TFTP_DEFAULT_BLKSIZE 512
#define TFTP_DEFAULT_TIMEOUT 5
static inline int tftp_session_in_use(struct tftp_session *spt)
{
return (spt->slirp != NULL);
}
static inline void tftp_session_update(struct tftp_session *spt)
{
spt->timestamp = curtime;
}
static void tftp_session_terminate(struct tftp_session *spt)
{
if (spt->fd >= 0) {
close(spt->fd);
spt->fd = -1;
}
free(spt->filename);
spt->slirp = NULL;
}
static tftp_session *tftp_session_allocate(Slirp *slirp, struct tftp_t *tp)
{
struct tftp_session *spt;
int k;
for (k = 0; k < TFTP_SESSIONS_MAX; k++) {
spt = &slirp->tftp_sessions[k];
if (!tftp_session_in_use(spt))
goto found;
/* sessions time out after 5 inactive seconds */
if ((curtime - spt->timestamp) > (spt->timeout_val * 1000)) {
tftp_session_terminate(spt);
goto found;
}
}
return NULL;
found:
memset(spt, 0, sizeof(*spt));
memcpy(&spt->client_ip, &tp->ip.ip_src, sizeof(spt->client_ip));
spt->fd = -1;
spt->client_port = tp->udp.uh_sport;
spt->slirp = slirp;
spt->write = (ntohs(tp->tp_op) == TFTP_WRQ);
spt->options = 0;
spt->blksize_val = TFTP_DEFAULT_BLKSIZE;
spt->timeout_val = TFTP_DEFAULT_TIMEOUT;
tftp_session_update(spt);
return spt;
}
static tftp_session *tftp_session_find(Slirp *slirp, struct tftp_t *tp)
{
struct tftp_session *spt;
int k;
for (k = 0; k < TFTP_SESSIONS_MAX; k++) {
spt = &slirp->tftp_sessions[k];
if (tftp_session_in_use(spt)) {
if (!memcmp(&spt->client_ip, &tp->ip.ip_src, sizeof(spt->client_ip))) {
if (spt->client_port == tp->udp.uh_sport) {
return spt;
}
}
}
}
return NULL;
}
static int tftp_read_data(struct tftp_session *spt, uint32_t block_nr,
uint8_t *buf, int len)
{
int bytes_read = 0;
if (spt->fd < 0) {
spt->fd = open(spt->filename, O_RDONLY | O_BINARY);
}
if (spt->fd < 0) {
return -1;
}
if (len) {
lseek(spt->fd, block_nr * spt->blksize_val, SEEK_SET);
bytes_read = read(spt->fd, buf, len);
}
return bytes_read;
}
static int tftp_send_optack(struct tftp_session *spt,
struct tftp_t *recv_tp)
{
struct sockaddr_in saddr, daddr;
struct mbuf *m;
struct tftp_t *tp;
int n = 0;
m = m_get(spt->slirp);
if (!m)
return -1;
memset(m->m_data, 0, m->m_size);
m->m_data += IF_MAXLINKHDR;
tp = (tftp_t*)m->m_data;
m->m_data += sizeof(struct udpiphdr);
tp->tp_op = htons(TFTP_OPTACK);
if (spt->options & TFTP_OPTION_TSIZE) {
n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%s",
"tsize") + 1;
n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%u",
(unsigned)spt->tsize_val) + 1;
}
if (spt->options & TFTP_OPTION_BLKSIZE) {
n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%s",
"blksize") + 1;
n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%u",
(unsigned)spt->blksize_val) + 1;
}
if (spt->options & TFTP_OPTION_TIMEOUT) {
n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%s",
"timeout") + 1;
n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%u",
(unsigned)spt->timeout_val) + 1;
}
saddr.sin_addr = recv_tp->ip.ip_dst;
saddr.sin_port = recv_tp->udp.uh_dport;
daddr.sin_addr = spt->client_ip;
daddr.sin_port = spt->client_port;
m->m_len = sizeof(struct tftp_t) - 514 + n -
sizeof(struct ip) - sizeof(struct udphdr);
udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
return 0;
}
static int tftp_send_ack(struct tftp_session *spt,
struct tftp_t *recv_tp)
{
struct sockaddr_in saddr, daddr;
struct mbuf *m;
struct tftp_t *tp;
m = m_get(spt->slirp);
if (!m)
return -1;
memset(m->m_data, 0, m->m_size);
m->m_data += IF_MAXLINKHDR;
tp = (tftp_t*)m->m_data;
m->m_data += sizeof(struct udpiphdr);
tp->tp_op = htons(TFTP_ACK);
tp->x.tp_data.tp_block_nr = htons(spt->block_nr & 0xffff);
saddr.sin_addr = recv_tp->ip.ip_dst;
saddr.sin_port = recv_tp->udp.uh_dport;
daddr.sin_addr = spt->client_ip;
daddr.sin_port = spt->client_port;
m->m_len = sizeof(struct tftp_t) - 514 + 2 -
sizeof(struct ip) - sizeof(struct udphdr);
udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
return 0;
}
static void tftp_send_error(struct tftp_session *spt,
uint16_t errorcode, const char *msg,
struct tftp_t *recv_tp)
{
struct sockaddr_in saddr, daddr;
struct mbuf *m;
struct tftp_t *tp;
m = m_get(spt->slirp);
if (!m) {
goto out;
}
memset(m->m_data, 0, m->m_size);
m->m_data += IF_MAXLINKHDR;
tp = (tftp_t*)m->m_data;
m->m_data += sizeof(struct udpiphdr);
tp->tp_op = htons(TFTP_ERROR);
tp->x.tp_error.tp_error_code = htons(errorcode);
pstrcpy((char *)tp->x.tp_error.tp_msg, sizeof(tp->x.tp_error.tp_msg), msg);
saddr.sin_addr = recv_tp->ip.ip_dst;
saddr.sin_port = recv_tp->udp.uh_dport;
daddr.sin_addr = spt->client_ip;
daddr.sin_port = spt->client_port;
m->m_len = sizeof(struct tftp_t) - 514 + 3 + strlen(msg) -
sizeof(struct ip) - sizeof(struct udphdr);
udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
out:
tftp_session_terminate(spt);
}
static void tftp_send_next_block(struct tftp_session *spt,
struct tftp_t *recv_tp)
{
struct sockaddr_in saddr, daddr;
struct mbuf *m;
struct tftp_t *tp;
int nobytes;
m = m_get(spt->slirp);
if (!m) {
return;
}
memset(m->m_data, 0, m->m_size);
m->m_data += IF_MAXLINKHDR;
tp = (tftp_t*)m->m_data;
m->m_data += sizeof(struct udpiphdr);
tp->tp_op = htons(TFTP_DATA);
tp->x.tp_data.tp_block_nr = htons((spt->block_nr + 1) & 0xffff);
saddr.sin_addr = recv_tp->ip.ip_dst;
saddr.sin_port = recv_tp->udp.uh_dport;
daddr.sin_addr = spt->client_ip;
daddr.sin_port = spt->client_port;
nobytes = tftp_read_data(spt, spt->block_nr, tp->x.tp_data.tp_buf, spt->blksize_val);
if (nobytes < 0) {
m_free(m);
/* send "file not found" error back */
tftp_send_error(spt, 1, "File not found", tp);
return;
}
m->m_len = sizeof(struct tftp_t) - (TFTP_BUFFER_SIZE - nobytes) -
sizeof(struct ip) - sizeof(struct udphdr);
udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
if (nobytes == (int)spt->blksize_val) {
tftp_session_update(spt);
} else {
tftp_session_terminate(spt);
}
spt->block_nr++;
}
static void tftp_parse_options(struct tftp_session *spt, struct tftp_t *tp, int k, int pktlen)
{
const char *key, *value;
while (k < pktlen) {
key = &tp->x.tp_buf[k];
k += strlen(key) + 1;
if (k < pktlen) {
value = &tp->x.tp_buf[k];
k += strlen(value) + 1;
} else {
value = NULL;
}
if (strcasecmp(key, "octet") == 0) {
spt->options |= TFTP_OPTION_OCTET;
} else if (strcasecmp(key, "tsize") == 0) {
spt->options |= TFTP_OPTION_TSIZE;
if (spt->write && (value != NULL)) {
spt->tsize_val = atoi(value);
}
} else if (strcasecmp(key, "blksize") == 0) {
if (value != NULL) {
spt->options |= TFTP_OPTION_BLKSIZE;
spt->blksize_val = atoi(value);
if (spt->blksize_val > TFTP_BUFFER_SIZE) {
spt->blksize_val = TFTP_DEFAULT_BLKSIZE;
}
}
} else if (strcasecmp(key, "timeout") == 0) {
if (value != NULL) {
spt->options |= TFTP_OPTION_TIMEOUT;
spt->timeout_val = atoi(value);
if ((spt->timeout_val < 1) || (spt->timeout_val > 255)) {
spt->timeout_val = TFTP_DEFAULT_TIMEOUT;
}
}
}
}
}
static void tftp_handle_rrq(Slirp *slirp, struct tftp_t *tp, int pktlen)
{
struct tftp_session *spt;
int k;
size_t prefix_len;
char *req_fname;
/* check if a session already exists and if so terminate it */
spt = tftp_session_find(slirp, tp);
if (spt != NULL) {
tftp_session_terminate(spt);
}
spt = tftp_session_allocate(slirp, tp);
if (spt == NULL) {
return;
}
/* unspecified prefix means service disabled */
if (!slirp->tftp_prefix) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
}
/* skip header fields */
k = 0;
pktlen -= offsetof(struct tftp_t, x.tp_buf);
/* prepend tftp_prefix */
prefix_len = strlen(slirp->tftp_prefix);
spt->filename = (char*)malloc(prefix_len + TFTP_FILENAME_MAX + 2);
memcpy(spt->filename, slirp->tftp_prefix, prefix_len);
spt->filename[prefix_len] = '/';
/* get name */
req_fname = spt->filename + prefix_len + 1;
while (1) {
if (k >= TFTP_FILENAME_MAX || k >= pktlen) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
}
req_fname[k] = tp->x.tp_buf[k];
if (req_fname[k++] == '\0') {
break;
}
}
tftp_parse_options(spt, tp, k, pktlen);
if (!(spt->options & TFTP_OPTION_OCTET)) {
tftp_send_error(spt, 4, "Unsupported transfer mode", tp);
return;
}
/* do sanity checks on the filename */
if (!strncmp(req_fname, "../", 3) ||
req_fname[strlen(req_fname) - 1] == '/' ||
strstr(req_fname, "/../")) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
}
/* check if the file exists */
if (tftp_read_data(spt, 0, NULL, 0) < 0) {
tftp_send_error(spt, 1, "File not found", tp);
return;
}
if (tp->x.tp_buf[pktlen - 1] != 0) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
}
if (spt->options & TFTP_OPTION_TSIZE) {
struct stat stat_p;
if (stat(spt->filename, &stat_p) == 0) {
spt->tsize_val = stat_p.st_size;
} else {
tftp_send_error(spt, 1, "File not found", tp);
return;
}
}
if ((spt->options & ~TFTP_OPTION_OCTET) > 0) {
tftp_send_optack(spt, tp);
} else {
spt->block_nr = 0;
tftp_send_next_block(spt, tp);
}
}
static void tftp_handle_wrq(Slirp *slirp, struct tftp_t *tp, int pktlen)
{
struct tftp_session *spt;
int k, fd;
size_t prefix_len;
char *req_fname;
/* check if a session already exists and if so terminate it */
spt = tftp_session_find(slirp, tp);
if (spt != NULL) {
tftp_session_terminate(spt);
}
spt = tftp_session_allocate(slirp, tp);
if (spt == NULL) {
return;
}
/* unspecified prefix means service disabled */
if (!slirp->tftp_prefix) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
}
/* skip header fields */
k = 0;
pktlen -= offsetof(struct tftp_t, x.tp_buf);
/* prepend tftp_prefix */
prefix_len = strlen(slirp->tftp_prefix);
spt->filename = (char*)malloc(prefix_len + TFTP_FILENAME_MAX + 2);
memcpy(spt->filename, slirp->tftp_prefix, prefix_len);
spt->filename[prefix_len] = '/';
/* get name */
req_fname = spt->filename + prefix_len + 1;
while (1) {
if (k >= TFTP_FILENAME_MAX || k >= pktlen) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
}
req_fname[k] = tp->x.tp_buf[k];
if (req_fname[k++] == '\0') {
break;
}
}
tftp_parse_options(spt, tp, k, pktlen);
if (!(spt->options & TFTP_OPTION_OCTET)) {
tftp_send_error(spt, 4, "Unsupported transfer mode", tp);
return;
}
/* do sanity checks on the filename */
if (!strncmp(req_fname, "../", 3) ||
req_fname[strlen(req_fname) - 1] == '/' ||
strstr(req_fname, "/../")) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
}
/* check if the file exists */
fd = open(spt->filename, O_RDONLY | O_BINARY);
if (fd >= 0) {
close(fd);
tftp_send_error(spt, 6, "File exists", tp);
return;
}
/* create new file */
spt->fd = open(spt->filename, O_CREAT | O_WRONLY
#ifdef O_BINARY
| O_BINARY
#endif
, S_IWUSR | S_IRUSR | S_IRGRP | S_IWGRP);
if (spt->fd < 0) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
}
if (tp->x.tp_buf[pktlen - 1] != 0) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
}
spt->block_nr = 0;
if ((spt->options & ~TFTP_OPTION_OCTET) > 0) {
tftp_send_optack(spt, tp);
} else {
tftp_send_ack(spt, tp);
}
}
static void tftp_handle_data(Slirp *slirp, struct tftp_t *tp, int pktlen)
{
struct tftp_session *spt;
int nobytes;
spt = tftp_session_find(slirp, tp);
if (spt == NULL) {
return;
}
if (spt->write == 1) {
spt->block_nr = ntohs(tp->x.tp_data.tp_block_nr);
nobytes = pktlen - offsetof(struct tftp_t, x.tp_data.tp_buf);
if (nobytes <= (int)spt->blksize_val) {
lseek(spt->fd, (spt->block_nr - 1) * spt->blksize_val, SEEK_SET);
write(spt->fd, tp->x.tp_data.tp_buf, nobytes);
tftp_send_ack(spt, tp);
if (nobytes == (int)spt->blksize_val) {
tftp_session_update(spt);
} else {
tftp_session_terminate(spt);
}
} else {
tftp_send_error(spt, 2, "Access violation", tp);
}
} else {
tftp_send_error(spt, 2, "Access violation", tp);
}
}
static void tftp_handle_ack(Slirp *slirp, struct tftp_t *tp, int pktlen)
{
struct tftp_session *spt;
spt = tftp_session_find(slirp, tp);
if (spt == NULL) {
return;
}
tftp_send_next_block(spt, tp);
}
static void tftp_handle_error(Slirp *slirp, struct tftp_t *tp, int pktlen)
{
struct tftp_session *spt;
spt = tftp_session_find(slirp, tp);
if (spt == NULL) {
return;
}
tftp_session_terminate(spt);
}
void tftp_input(struct mbuf *m)
{
struct tftp_t *tp = (struct tftp_t *)m->m_data;
switch (ntohs(tp->tp_op)) {
case TFTP_RRQ:
tftp_handle_rrq(m->slirp, tp, m->m_len);
break;
case TFTP_WRQ:
tftp_handle_wrq(m->slirp, tp, m->m_len);
break;
case TFTP_DATA:
tftp_handle_data(m->slirp, tp, m->m_len);
break;
case TFTP_ACK:
tftp_handle_ack(m->slirp, tp, m->m_len);
break;
case TFTP_ERROR:
tftp_handle_error(m->slirp, tp, m->m_len);
break;
}
}
#endif
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