* THE SOFTWARE.
*/
-#include <slirp.h>
+#include "qemu/osdep.h"
+#include "slirp.h"
#include "qemu-common.h"
+#include "qemu/cutils.h"
static inline int tftp_session_in_use(struct tftp_session *spt)
{
static void tftp_session_terminate(struct tftp_session *spt)
{
- qemu_free(spt->filename);
+ if (spt->fd >= 0) {
+ close(spt->fd);
+ spt->fd = -1;
+ }
+ g_free(spt->filename);
spt->slirp = NULL;
}
-static int tftp_session_allocate(Slirp *slirp, struct tftp_t *tp)
+static int tftp_session_allocate(Slirp *slirp, struct sockaddr_storage *srcsas,
+ struct tftp_t *tp)
{
struct tftp_session *spt;
int k;
/* sessions time out after 5 inactive seconds */
if ((int)(curtime - spt->timestamp) > 5000) {
- qemu_free(spt->filename);
+ tftp_session_terminate(spt);
goto found;
}
}
found:
memset(spt, 0, sizeof(*spt));
- memcpy(&spt->client_ip, &tp->ip.ip_src, sizeof(spt->client_ip));
+ memcpy(&spt->client_addr, srcsas, sockaddr_size(srcsas));
+ spt->fd = -1;
+ spt->block_size = 512;
spt->client_port = tp->udp.uh_sport;
spt->slirp = slirp;
return k;
}
-static int tftp_session_find(Slirp *slirp, struct tftp_t *tp)
+static int tftp_session_find(Slirp *slirp, struct sockaddr_storage *srcsas,
+ struct tftp_t *tp)
{
struct tftp_session *spt;
int 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 (sockaddr_equal(&spt->client_addr, srcsas)) {
if (spt->client_port == tp->udp.uh_sport) {
return k;
}
return -1;
}
-static int tftp_read_data(struct tftp_session *spt, u_int16_t block_nr,
- u_int8_t *buf, int len)
+static int tftp_read_data(struct tftp_session *spt, uint32_t block_nr,
+ uint8_t *buf, int len)
{
- int fd;
- int bytes_read = 0;
+ int bytes_read = 0;
- fd = open(spt->filename, O_RDONLY | O_BINARY);
+ if (spt->fd < 0) {
+ spt->fd = open(spt->filename, O_RDONLY | O_BINARY);
+ }
- if (fd < 0) {
- return -1;
- }
+ if (spt->fd < 0) {
+ return -1;
+ }
- if (len) {
- lseek(fd, block_nr * 512, SEEK_SET);
+ if (len) {
+ lseek(spt->fd, block_nr * spt->block_size, SEEK_SET);
- bytes_read = read(fd, buf, len);
- }
+ bytes_read = read(spt->fd, buf, len);
+ }
+
+ return bytes_read;
+}
+
+static struct tftp_t *tftp_prep_mbuf_data(struct tftp_session *spt,
+ struct mbuf *m)
+{
+ struct tftp_t *tp;
+
+ memset(m->m_data, 0, m->m_size);
+
+ m->m_data += IF_MAXLINKHDR;
+ if (spt->client_addr.ss_family == AF_INET6) {
+ m->m_data += sizeof(struct ip6);
+ } else {
+ m->m_data += sizeof(struct ip);
+ }
+ tp = (void *)m->m_data;
+ m->m_data += sizeof(struct udphdr);
+
+ return tp;
+}
+
+static void tftp_udp_output(struct tftp_session *spt, struct mbuf *m,
+ struct tftp_t *recv_tp)
+{
+ if (spt->client_addr.ss_family == AF_INET6) {
+ struct sockaddr_in6 sa6, da6;
+
+ sa6.sin6_addr = spt->slirp->vhost_addr6;
+ sa6.sin6_port = recv_tp->udp.uh_dport;
+ da6.sin6_addr = ((struct sockaddr_in6 *)&spt->client_addr)->sin6_addr;
+ da6.sin6_port = spt->client_port;
- close(fd);
+ udp6_output(NULL, m, &sa6, &da6);
+ } else {
+ struct sockaddr_in sa4, da4;
- return bytes_read;
+ sa4.sin_addr = spt->slirp->vhost_addr;
+ sa4.sin_port = recv_tp->udp.uh_dport;
+ da4.sin_addr = ((struct sockaddr_in *)&spt->client_addr)->sin_addr;
+ da4.sin_port = spt->client_port;
+
+ udp_output(NULL, m, &sa4, &da4, IPTOS_LOWDELAY);
+ }
}
static int tftp_send_oack(struct tftp_session *spt,
- const char *key, uint32_t value,
+ const char *keys[], uint32_t values[], int nb,
struct tftp_t *recv_tp)
{
- struct sockaddr_in saddr, daddr;
struct mbuf *m;
struct tftp_t *tp;
- int n = 0;
+ int i, n = 0;
m = m_get(spt->slirp);
if (!m)
- return -1;
+ return -1;
- memset(m->m_data, 0, m->m_size);
-
- m->m_data += IF_MAXLINKHDR;
- tp = (void *)m->m_data;
- m->m_data += sizeof(struct udpiphdr);
+ tp = tftp_prep_mbuf_data(spt, m);
tp->tp_op = htons(TFTP_OACK);
- n += snprintf((char *)tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%s",
- key) + 1;
- n += snprintf((char *)tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%u",
- value) + 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;
+ for (i = 0; i < nb; i++) {
+ n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%s",
+ keys[i]) + 1;
+ n += snprintf(tp->x.tp_buf + n, sizeof(tp->x.tp_buf) - n, "%u",
+ values[i]) + 1;
+ }
- m->m_len = sizeof(struct tftp_t) - 514 + n -
- sizeof(struct ip) - sizeof(struct udphdr);
- udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
+ m->m_len = sizeof(struct tftp_t) - (TFTP_BLOCKSIZE_MAX + 2) + n
+ - sizeof(struct udphdr);
+ tftp_udp_output(spt, m, recv_tp);
return 0;
}
static void tftp_send_error(struct tftp_session *spt,
- u_int16_t errorcode, const char *msg,
+ uint16_t errorcode, const char *msg,
struct tftp_t *recv_tp)
{
- struct sockaddr_in saddr, daddr;
struct mbuf *m;
struct tftp_t *tp;
- int nobytes;
m = m_get(spt->slirp);
goto out;
}
- memset(m->m_data, 0, m->m_size);
-
- m->m_data += IF_MAXLINKHDR;
- tp = (void *)m->m_data;
- m->m_data += sizeof(struct udpiphdr);
+ tp = tftp_prep_mbuf_data(spt, m);
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;
-
- nobytes = 2;
-
- 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);
+ m->m_len = sizeof(struct tftp_t) - (TFTP_BLOCKSIZE_MAX + 2) + 3 + strlen(msg)
+ - sizeof(struct udphdr);
+ tftp_udp_output(spt, m, recv_tp);
out:
tftp_session_terminate(spt);
}
-static int tftp_send_data(struct tftp_session *spt,
- u_int16_t block_nr,
- struct tftp_t *recv_tp)
+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;
- if (block_nr < 1) {
- return -1;
- }
-
m = m_get(spt->slirp);
if (!m) {
- return -1;
+ return;
}
- memset(m->m_data, 0, m->m_size);
-
- m->m_data += IF_MAXLINKHDR;
- tp = (void *)m->m_data;
- m->m_data += sizeof(struct udpiphdr);
+ tp = tftp_prep_mbuf_data(spt, m);
tp->tp_op = htons(TFTP_DATA);
- tp->x.tp_data.tp_block_nr = htons(block_nr);
+ 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, block_nr - 1, tp->x.tp_data.tp_buf, 512);
+ nobytes = tftp_read_data(spt, spt->block_nr, tp->x.tp_data.tp_buf,
+ spt->block_size);
if (nobytes < 0) {
m_free(m);
tftp_send_error(spt, 1, "File not found", tp);
- return -1;
+ return;
}
- m->m_len = sizeof(struct tftp_t) - (512 - nobytes) -
- sizeof(struct ip) - sizeof(struct udphdr);
+ m->m_len = sizeof(struct tftp_t) - (TFTP_BLOCKSIZE_MAX - nobytes)
+ - sizeof(struct udphdr);
+ tftp_udp_output(spt, m, recv_tp);
- udp_output2(NULL, m, &saddr, &daddr, IPTOS_LOWDELAY);
-
- if (nobytes == 512) {
+ if (nobytes == spt->block_size) {
tftp_session_update(spt);
}
else {
tftp_session_terminate(spt);
}
- return 0;
+ spt->block_nr++;
}
-static void tftp_handle_rrq(Slirp *slirp, struct tftp_t *tp, int pktlen)
+static void tftp_handle_rrq(Slirp *slirp, struct sockaddr_storage *srcsas,
+ struct tftp_t *tp, int pktlen)
{
struct tftp_session *spt;
int s, k;
size_t prefix_len;
char *req_fname;
+ const char *option_name[2];
+ uint32_t option_value[2];
+ int nb_options = 0;
+
+ /* check if a session already exists and if so terminate it */
+ s = tftp_session_find(slirp, srcsas, tp);
+ if (s >= 0) {
+ tftp_session_terminate(&slirp->tftp_sessions[s]);
+ }
- s = tftp_session_allocate(slirp, tp);
+ s = tftp_session_allocate(slirp, srcsas, tp);
if (s < 0) {
return;
spt = &slirp->tftp_sessions[s];
- /* unspecifed prefix means service disabled */
+ /* unspecified prefix means service disabled */
if (!slirp->tftp_prefix) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
/* skip header fields */
k = 0;
- pktlen -= ((uint8_t *)&tp->x.tp_buf[0] - (uint8_t *)tp);
+ pktlen -= offsetof(struct tftp_t, x.tp_buf);
/* prepend tftp_prefix */
prefix_len = strlen(slirp->tftp_prefix);
- spt->filename = qemu_malloc(prefix_len + TFTP_FILENAME_MAX + 1);
+ spt->filename = g_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;
+ 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] = (char)tp->x.tp_buf[k];
+ req_fname[k] = tp->x.tp_buf[k];
if (req_fname[k++] == '\0') {
break;
}
return;
}
- if (memcmp(&tp->x.tp_buf[k], "octet\0", 6) != 0) {
+ if (strcasecmp(&tp->x.tp_buf[k], "octet") != 0) {
tftp_send_error(spt, 4, "Unsupported transfer mode", tp);
return;
}
k += 6; /* skipping octet */
/* do sanity checks on the filename */
- if (req_fname[0] != '/' || req_fname[strlen(req_fname) - 1] == '/' ||
+ if (!strncmp(req_fname, "../", 3) ||
+ req_fname[strlen(req_fname) - 1] == '/' ||
strstr(req_fname, "/../")) {
tftp_send_error(spt, 2, "Access violation", tp);
return;
return;
}
- while (k < pktlen) {
+ while (k < pktlen && nb_options < ARRAY_SIZE(option_name)) {
const char *key, *value;
- key = (const char *)&tp->x.tp_buf[k];
+ key = &tp->x.tp_buf[k];
k += strlen(key) + 1;
if (k >= pktlen) {
return;
}
- value = (const char *)&tp->x.tp_buf[k];
+ value = &tp->x.tp_buf[k];
k += strlen(value) + 1;
- if (strcmp(key, "tsize") == 0) {
+ if (strcasecmp(key, "tsize") == 0) {
int tsize = atoi(value);
struct stat stat_p;
}
}
- tftp_send_oack(spt, "tsize", tsize, tp);
+ option_name[nb_options] = "tsize";
+ option_value[nb_options] = tsize;
+ nb_options++;
+ } else if (strcasecmp(key, "blksize") == 0) {
+ int blksize = atoi(value);
+
+ /* Accept blksize up to our maximum size */
+ if (blksize > 0) {
+ spt->block_size = MIN(blksize, TFTP_BLOCKSIZE_MAX);
+ option_name[nb_options] = "blksize";
+ option_value[nb_options] = spt->block_size;
+ nb_options++;
+ }
}
}
- tftp_send_data(spt, 1, tp);
+ if (nb_options > 0) {
+ assert(nb_options <= ARRAY_SIZE(option_name));
+ tftp_send_oack(spt, option_name, option_value, nb_options, tp);
+ return;
+ }
+
+ spt->block_nr = 0;
+ tftp_send_next_block(spt, tp);
}
-static void tftp_handle_ack(Slirp *slirp, struct tftp_t *tp, int pktlen)
+static void tftp_handle_ack(Slirp *slirp, struct sockaddr_storage *srcsas,
+ struct tftp_t *tp, int pktlen)
{
int s;
- s = tftp_session_find(slirp, tp);
+ s = tftp_session_find(slirp, srcsas, tp);
if (s < 0) {
return;
}
- if (tftp_send_data(&slirp->tftp_sessions[s],
- ntohs(tp->x.tp_data.tp_block_nr) + 1,
- tp) < 0) {
+ tftp_send_next_block(&slirp->tftp_sessions[s], tp);
+}
+
+static void tftp_handle_error(Slirp *slirp, struct sockaddr_storage *srcsas,
+ struct tftp_t *tp, int pktlen)
+{
+ int s;
+
+ s = tftp_session_find(slirp, srcsas, tp);
+
+ if (s < 0) {
return;
}
+
+ tftp_session_terminate(&slirp->tftp_sessions[s]);
}
-void tftp_input(struct mbuf *m)
+void tftp_input(struct sockaddr_storage *srcsas, 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);
+ tftp_handle_rrq(m->slirp, srcsas, tp, m->m_len);
break;
case TFTP_ACK:
- tftp_handle_ack(m->slirp, tp, m->m_len);
+ tftp_handle_ack(m->slirp, srcsas, tp, m->m_len);
+ break;
+
+ case TFTP_ERROR:
+ tftp_handle_error(m->slirp, srcsas, tp, m->m_len);
break;
}
}
projects / qemu.git / blobdiff