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added TCP/UDP packet splitting to fit within MTU

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This commit is contained in:
robert 2023-09-07 02:14:09 -04:00
parent a1e316ddcf
commit 264026acde
5 changed files with 380 additions and 280 deletions
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mongoose.c
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@ -3563,6 +3563,270 @@ struct mg_connection *mg_mqtt_listen(struct mg_mgr *mgr, const char *url,
return c;
}
#ifdef MG_ENABLE_LINES
#line 1 "src/net.c"
#endif
size_t mg_vprintf(struct mg_connection *c, const char *fmt, va_list *ap) {
size_t old = c->send.len;
mg_vxprintf(mg_pfn_iobuf, &c->send, fmt, ap);
return c->send.len - old;
}
size_t mg_printf(struct mg_connection *c, const char *fmt, ...) {
size_t len = 0;
va_list ap;
va_start(ap, fmt);
len = mg_vprintf(c, fmt, &ap);
va_end(ap);
return len;
}
static bool mg_atonl(struct mg_str str, struct mg_addr *addr) {
uint32_t localhost = mg_htonl(0x7f000001);
if (mg_vcasecmp(&str, "localhost") != 0) return false;
memcpy(addr->ip, &localhost, sizeof(uint32_t));
addr->is_ip6 = false;
return true;
}
static bool mg_atone(struct mg_str str, struct mg_addr *addr) {
if (str.len > 0) return false;
memset(addr->ip, 0, sizeof(addr->ip));
addr->is_ip6 = false;
return true;
}
static bool mg_aton4(struct mg_str str, struct mg_addr *addr) {
uint8_t data[4] = {0, 0, 0, 0};
size_t i, num_dots = 0;
for (i = 0; i < str.len; i++) {
if (str.ptr[i] >= '0' && str.ptr[i] <= '9') {
int octet = data[num_dots] * 10 + (str.ptr[i] - '0');
if (octet > 255) return false;
data[num_dots] = (uint8_t) octet;
} else if (str.ptr[i] == '.') {
if (num_dots >= 3 || i == 0 || str.ptr[i - 1] == '.') return false;
num_dots++;
} else {
return false;
}
}
if (num_dots != 3 || str.ptr[i - 1] == '.') return false;
memcpy(&addr->ip, data, sizeof(data));
addr->is_ip6 = false;
return true;
}
static bool mg_v4mapped(struct mg_str str, struct mg_addr *addr) {
int i;
uint32_t ipv4;
if (str.len < 14) return false;
if (str.ptr[0] != ':' || str.ptr[1] != ':' || str.ptr[6] != ':') return false;
for (i = 2; i < 6; i++) {
if (str.ptr[i] != 'f' && str.ptr[i] != 'F') return false;
}
// struct mg_str s = mg_str_n(&str.ptr[7], str.len - 7);
if (!mg_aton4(mg_str_n(&str.ptr[7], str.len - 7), addr)) return false;
memcpy(&ipv4, addr->ip, sizeof(ipv4));
memset(addr->ip, 0, sizeof(addr->ip));
addr->ip[10] = addr->ip[11] = 255;
memcpy(&addr->ip[12], &ipv4, 4);
addr->is_ip6 = true;
return true;
}
static bool mg_aton6(struct mg_str str, struct mg_addr *addr) {
size_t i, j = 0, n = 0, dc = 42;
if (str.len > 2 && str.ptr[0] == '[') str.ptr++, str.len -= 2;
if (mg_v4mapped(str, addr)) return true;
for (i = 0; i < str.len; i++) {
if ((str.ptr[i] >= '0' && str.ptr[i] <= '9') ||
(str.ptr[i] >= 'a' && str.ptr[i] <= 'f') ||
(str.ptr[i] >= 'A' && str.ptr[i] <= 'F')) {
unsigned long val;
if (i > j + 3) return false;
// MG_DEBUG(("%zu %zu [%.*s]", i, j, (int) (i - j + 1), &str.ptr[j]));
val = mg_unhexn(&str.ptr[j], i - j + 1);
addr->ip[n] = (uint8_t) ((val >> 8) & 255);
addr->ip[n + 1] = (uint8_t) (val & 255);
} else if (str.ptr[i] == ':') {
j = i + 1;
if (i > 0 && str.ptr[i - 1] == ':') {
dc = n; // Double colon
if (i > 1 && str.ptr[i - 2] == ':') return false;
} else if (i > 0) {
n += 2;
}
if (n > 14) return false;
addr->ip[n] = addr->ip[n + 1] = 0; // For trailing ::
} else {
return false;
}
}
if (n < 14 && dc == 42) return false;
if (n < 14) {
memmove(&addr->ip[dc + (14 - n)], &addr->ip[dc], n - dc + 2);
memset(&addr->ip[dc], 0, 14 - n);
}
addr->is_ip6 = true;
return true;
}
bool mg_aton(struct mg_str str, struct mg_addr *addr) {
// MG_INFO(("[%.*s]", (int) str.len, str.ptr));
return mg_atone(str, addr) || mg_atonl(str, addr) || mg_aton4(str, addr) ||
mg_aton6(str, addr);
}
struct mg_connection *mg_alloc_conn(struct mg_mgr *mgr) {
struct mg_connection *c =
(struct mg_connection *) calloc(1, sizeof(*c) + mgr->extraconnsize);
if (c != NULL) {
c->mgr = mgr;
c->send.align = c->recv.align = MG_IO_SIZE;
c->id = ++mgr->nextid;
}
return c;
}
void mg_close_conn(struct mg_connection *c) {
mg_resolve_cancel(c); // Close any pending DNS query
LIST_DELETE(struct mg_connection, &c->mgr->conns, c);
if (c == c->mgr->dns4.c) c->mgr->dns4.c = NULL;
if (c == c->mgr->dns6.c) c->mgr->dns6.c = NULL;
// Order of operations is important. `MG_EV_CLOSE` event must be fired
// before we deallocate received data, see #1331
mg_call(c, MG_EV_CLOSE, NULL);
MG_DEBUG(("%lu %p closed", c->id, c->fd));
mg_tls_free(c);
mg_iobuf_free(&c->recv);
mg_iobuf_free(&c->send);
memset(c, 0, sizeof(*c));
free(c);
}
struct mg_connection *mg_connect(struct mg_mgr *mgr, const char *url,
mg_event_handler_t fn, void *fn_data) {
struct mg_connection *c = NULL;
if (url == NULL || url[0] == '\0') {
MG_ERROR(("null url"));
} else if ((c = mg_alloc_conn(mgr)) == NULL) {
MG_ERROR(("OOM"));
} else {
LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
c->is_udp = (strncmp(url, "udp:", 4) == 0);
c->fd = (void *) (size_t) MG_INVALID_SOCKET;
c->fn = fn;
c->is_client = true;
c->fn_data = fn_data;
MG_DEBUG(("%lu %p %s", c->id, c->fd, url));
mg_call(c, MG_EV_OPEN, (void *) url);
mg_resolve(c, url);
if (mg_url_is_ssl(url)) {
struct mg_str host = mg_url_host(url);
mg_tls_init(c, host);
}
}
return c;
}
struct mg_connection *mg_listen(struct mg_mgr *mgr, const char *url,
mg_event_handler_t fn, void *fn_data) {
struct mg_connection *c = NULL;
if ((c = mg_alloc_conn(mgr)) == NULL) {
MG_ERROR(("OOM %s", url));
} else if (!mg_open_listener(c, url)) {
MG_ERROR(("Failed: %s, errno %d", url, errno));
free(c);
c = NULL;
} else {
c->is_listening = 1;
c->is_udp = strncmp(url, "udp:", 4) == 0;
LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
c->fn = fn;
c->fn_data = fn_data;
mg_call(c, MG_EV_OPEN, NULL);
if (mg_url_is_ssl(url)) c->is_tls = 1; // Accepted connection must
MG_DEBUG(("%lu %p %s", c->id, c->fd, url));
}
return c;
}
struct mg_connection *mg_wrapfd(struct mg_mgr *mgr, int fd,
mg_event_handler_t fn, void *fn_data) {
struct mg_connection *c = mg_alloc_conn(mgr);
if (c != NULL) {
c->fd = (void *) (size_t) fd;
c->fn = fn;
c->fn_data = fn_data;
MG_EPOLL_ADD(c);
mg_call(c, MG_EV_OPEN, NULL);
LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
}
return c;
}
struct mg_timer *mg_timer_add(struct mg_mgr *mgr, uint64_t milliseconds,
unsigned flags, void (*fn)(void *), void *arg) {
struct mg_timer *t = (struct mg_timer *) calloc(1, sizeof(*t));
if (t != NULL) {
mg_timer_init(&mgr->timers, t, milliseconds, flags, fn, arg);
t->id = mgr->timerid++;
}
return t;
}
void mg_mgr_free(struct mg_mgr *mgr) {
struct mg_connection *c;
struct mg_timer *tmp, *t = mgr->timers;
while (t != NULL) tmp = t->next, free(t), t = tmp;
mgr->timers = NULL; // Important. Next call to poll won't touch timers
for (c = mgr->conns; c != NULL; c = c->next) c->is_closing = 1;
mg_mgr_poll(mgr, 0);
#if MG_ENABLE_FREERTOS_TCP
FreeRTOS_DeleteSocketSet(mgr->ss);
#endif
MG_DEBUG(("All connections closed"));
#if MG_ENABLE_EPOLL
if (mgr->epoll_fd >= 0) close(mgr->epoll_fd), mgr->epoll_fd = -1;
#endif
mg_tls_ctx_free(mgr);
}
void mg_mgr_init(struct mg_mgr *mgr) {
memset(mgr, 0, sizeof(*mgr));
#if MG_ENABLE_EPOLL
if ((mgr->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
MG_ERROR(("epoll_create1 errno %d", errno));
#else
mgr->epoll_fd = -1;
#endif
#if MG_ARCH == MG_ARCH_WIN32 && MG_ENABLE_WINSOCK
// clang-format off
{ WSADATA data; WSAStartup(MAKEWORD(2, 2), &data); }
// clang-format on
#elif MG_ENABLE_FREERTOS_TCP
mgr->ss = FreeRTOS_CreateSocketSet();
#elif defined(__unix) || defined(__unix__) || defined(__APPLE__)
// Ignore SIGPIPE signal, so if client cancels the request, it
// won't kill the whole process.
signal(SIGPIPE, SIG_IGN);
#endif
mgr->dnstimeout = 3000;
mgr->dns4.url = "udp://8.8.8.8:53";
mgr->dns6.url = "udp://[2001:4860:4860::8888]:53";
}
#ifdef MG_ENABLE_LINES
#line 1 "src/net_builtin.c"
#endif
@ -4116,21 +4380,43 @@ static struct mg_connection *accept_conn(struct mg_connection *lsn,
return c;
}
static size_t trim_len(struct mg_connection *c, size_t len) {
struct mg_tcpip_if *ifp = (struct mg_tcpip_if *) c->mgr->priv;
size_t eth_h_len = 14, ip_max_h_len = 24, tcp_max_h_len = 60, udp_h_len = 8;
size_t max_headers_len = eth_h_len + ip_max_h_len +
(c->is_udp ? udp_h_len : tcp_max_h_len);
size_t min_mtu = c->is_udp ? 68 /* RFC-791 */ : max_headers_len - eth_h_len;
// If the frame exceeds the available buffer, trim the length
if (len + max_headers_len > ifp->tx.len) {
len = ifp->tx.len - max_headers_len;
}
// Ensure the MTU isn't lower than the minimum allowed value
if (ifp->mtu < min_mtu) {
MG_ERROR(("MTU is lower than minimum possible value. Setting it to %d.",
min_mtu));
ifp->mtu = (uint16_t) min_mtu;
}
// If the total packet size exceeds the MTU, trim the length
if (len + max_headers_len - eth_h_len > ifp->mtu) {
len = ifp->mtu - max_headers_len + eth_h_len;
if (c->is_udp) {
MG_ERROR(("UDP datagram exceeds MTU. Truncating it."));
}
}
return len;
}
long mg_io_send(struct mg_connection *c, const void *buf, size_t len) {
struct mg_tcpip_if *ifp = (struct mg_tcpip_if *) c->mgr->priv;
struct connstate *s = (struct connstate *) (c + 1);
uint32_t rem_ip;
memcpy(&rem_ip, c->rem.ip, sizeof(uint32_t));
len = trim_len(c, len);
if (c->is_udp) {
size_t max_headers_len = 14 + 24 /* max IP */ + 8 /* UDP */;
if (len + max_headers_len > ifp->tx.len) {
len = ifp->tx.len - max_headers_len;
}
tx_udp(ifp, s->mac, ifp->ip, c->loc.port, rem_ip, c->rem.port, buf, len);
} else {
size_t max_headers_len = 14 + 24 /* max IP */ + 60 /* max TCP */;
if (len + max_headers_len > ifp->tx.len)
len = ifp->tx.len - max_headers_len;
if (tx_tcp(ifp, s->mac, rem_ip, TH_PUSH | TH_ACK, c->loc.port, c->rem.port,
mg_htonl(s->seq), mg_htonl(s->ack), buf, len) > 0) {
s->seq += (uint32_t) len;
@ -4509,6 +4795,7 @@ void mg_tcpip_init(struct mg_mgr *mgr, struct mg_tcpip_if *ifp) {
ifp->timer_1000ms = mg_millis();
mgr->priv = ifp;
ifp->mgr = mgr;
ifp->mtu = MG_TCPIP_MTU_DEFAULT;
mgr->extraconnsize = sizeof(struct connstate);
if (ifp->ip == 0) ifp->enable_dhcp_client = true;
memset(ifp->gwmac, 255, sizeof(ifp->gwmac)); // Set to broadcast
@ -4649,6 +4936,7 @@ bool mg_send(struct mg_connection *c, const void *buf, size_t len) {
mg_error(c, "net down");
} else if (c->is_udp) {
struct connstate *s = (struct connstate *) (c + 1);
len = trim_len(c, len); // Trimming length if necessary
tx_udp(ifp, s->mac, ifp->ip, c->loc.port, rem_ip, c->rem.port, buf, len);
res = true;
} else {
@ -4658,270 +4946,6 @@ bool mg_send(struct mg_connection *c, const void *buf, size_t len) {
}
#endif // MG_ENABLE_TCPIP
#ifdef MG_ENABLE_LINES
#line 1 "src/net.c"
#endif
size_t mg_vprintf(struct mg_connection *c, const char *fmt, va_list *ap) {
size_t old = c->send.len;
mg_vxprintf(mg_pfn_iobuf, &c->send, fmt, ap);
return c->send.len - old;
}
size_t mg_printf(struct mg_connection *c, const char *fmt, ...) {
size_t len = 0;
va_list ap;
va_start(ap, fmt);
len = mg_vprintf(c, fmt, &ap);
va_end(ap);
return len;
}
static bool mg_atonl(struct mg_str str, struct mg_addr *addr) {
uint32_t localhost = mg_htonl(0x7f000001);
if (mg_vcasecmp(&str, "localhost") != 0) return false;
memcpy(addr->ip, &localhost, sizeof(uint32_t));
addr->is_ip6 = false;
return true;
}
static bool mg_atone(struct mg_str str, struct mg_addr *addr) {
if (str.len > 0) return false;
memset(addr->ip, 0, sizeof(addr->ip));
addr->is_ip6 = false;
return true;
}
static bool mg_aton4(struct mg_str str, struct mg_addr *addr) {
uint8_t data[4] = {0, 0, 0, 0};
size_t i, num_dots = 0;
for (i = 0; i < str.len; i++) {
if (str.ptr[i] >= '0' && str.ptr[i] <= '9') {
int octet = data[num_dots] * 10 + (str.ptr[i] - '0');
if (octet > 255) return false;
data[num_dots] = (uint8_t) octet;
} else if (str.ptr[i] == '.') {
if (num_dots >= 3 || i == 0 || str.ptr[i - 1] == '.') return false;
num_dots++;
} else {
return false;
}
}
if (num_dots != 3 || str.ptr[i - 1] == '.') return false;
memcpy(&addr->ip, data, sizeof(data));
addr->is_ip6 = false;
return true;
}
static bool mg_v4mapped(struct mg_str str, struct mg_addr *addr) {
int i;
uint32_t ipv4;
if (str.len < 14) return false;
if (str.ptr[0] != ':' || str.ptr[1] != ':' || str.ptr[6] != ':') return false;
for (i = 2; i < 6; i++) {
if (str.ptr[i] != 'f' && str.ptr[i] != 'F') return false;
}
// struct mg_str s = mg_str_n(&str.ptr[7], str.len - 7);
if (!mg_aton4(mg_str_n(&str.ptr[7], str.len - 7), addr)) return false;
memcpy(&ipv4, addr->ip, sizeof(ipv4));
memset(addr->ip, 0, sizeof(addr->ip));
addr->ip[10] = addr->ip[11] = 255;
memcpy(&addr->ip[12], &ipv4, 4);
addr->is_ip6 = true;
return true;
}
static bool mg_aton6(struct mg_str str, struct mg_addr *addr) {
size_t i, j = 0, n = 0, dc = 42;
if (str.len > 2 && str.ptr[0] == '[') str.ptr++, str.len -= 2;
if (mg_v4mapped(str, addr)) return true;
for (i = 0; i < str.len; i++) {
if ((str.ptr[i] >= '0' && str.ptr[i] <= '9') ||
(str.ptr[i] >= 'a' && str.ptr[i] <= 'f') ||
(str.ptr[i] >= 'A' && str.ptr[i] <= 'F')) {
unsigned long val;
if (i > j + 3) return false;
// MG_DEBUG(("%zu %zu [%.*s]", i, j, (int) (i - j + 1), &str.ptr[j]));
val = mg_unhexn(&str.ptr[j], i - j + 1);
addr->ip[n] = (uint8_t) ((val >> 8) & 255);
addr->ip[n + 1] = (uint8_t) (val & 255);
} else if (str.ptr[i] == ':') {
j = i + 1;
if (i > 0 && str.ptr[i - 1] == ':') {
dc = n; // Double colon
if (i > 1 && str.ptr[i - 2] == ':') return false;
} else if (i > 0) {
n += 2;
}
if (n > 14) return false;
addr->ip[n] = addr->ip[n + 1] = 0; // For trailing ::
} else {
return false;
}
}
if (n < 14 && dc == 42) return false;
if (n < 14) {
memmove(&addr->ip[dc + (14 - n)], &addr->ip[dc], n - dc + 2);
memset(&addr->ip[dc], 0, 14 - n);
}
addr->is_ip6 = true;
return true;
}
bool mg_aton(struct mg_str str, struct mg_addr *addr) {
// MG_INFO(("[%.*s]", (int) str.len, str.ptr));
return mg_atone(str, addr) || mg_atonl(str, addr) || mg_aton4(str, addr) ||
mg_aton6(str, addr);
}
struct mg_connection *mg_alloc_conn(struct mg_mgr *mgr) {
struct mg_connection *c =
(struct mg_connection *) calloc(1, sizeof(*c) + mgr->extraconnsize);
if (c != NULL) {
c->mgr = mgr;
c->send.align = c->recv.align = MG_IO_SIZE;
c->id = ++mgr->nextid;
}
return c;
}
void mg_close_conn(struct mg_connection *c) {
mg_resolve_cancel(c); // Close any pending DNS query
LIST_DELETE(struct mg_connection, &c->mgr->conns, c);
if (c == c->mgr->dns4.c) c->mgr->dns4.c = NULL;
if (c == c->mgr->dns6.c) c->mgr->dns6.c = NULL;
// Order of operations is important. `MG_EV_CLOSE` event must be fired
// before we deallocate received data, see #1331
mg_call(c, MG_EV_CLOSE, NULL);
MG_DEBUG(("%lu %p closed", c->id, c->fd));
mg_tls_free(c);
mg_iobuf_free(&c->recv);
mg_iobuf_free(&c->send);
memset(c, 0, sizeof(*c));
free(c);
}
struct mg_connection *mg_connect(struct mg_mgr *mgr, const char *url,
mg_event_handler_t fn, void *fn_data) {
struct mg_connection *c = NULL;
if (url == NULL || url[0] == '\0') {
MG_ERROR(("null url"));
} else if ((c = mg_alloc_conn(mgr)) == NULL) {
MG_ERROR(("OOM"));
} else {
LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
c->is_udp = (strncmp(url, "udp:", 4) == 0);
c->fd = (void *) (size_t) MG_INVALID_SOCKET;
c->fn = fn;
c->is_client = true;
c->fn_data = fn_data;
MG_DEBUG(("%lu %p %s", c->id, c->fd, url));
mg_call(c, MG_EV_OPEN, (void *) url);
mg_resolve(c, url);
if (mg_url_is_ssl(url)) {
struct mg_str host = mg_url_host(url);
mg_tls_init(c, host);
}
}
return c;
}
struct mg_connection *mg_listen(struct mg_mgr *mgr, const char *url,
mg_event_handler_t fn, void *fn_data) {
struct mg_connection *c = NULL;
if ((c = mg_alloc_conn(mgr)) == NULL) {
MG_ERROR(("OOM %s", url));
} else if (!mg_open_listener(c, url)) {
MG_ERROR(("Failed: %s, errno %d", url, errno));
free(c);
c = NULL;
} else {
c->is_listening = 1;
c->is_udp = strncmp(url, "udp:", 4) == 0;
LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
c->fn = fn;
c->fn_data = fn_data;
mg_call(c, MG_EV_OPEN, NULL);
if (mg_url_is_ssl(url)) c->is_tls = 1; // Accepted connection must
MG_DEBUG(("%lu %p %s", c->id, c->fd, url));
}
return c;
}
struct mg_connection *mg_wrapfd(struct mg_mgr *mgr, int fd,
mg_event_handler_t fn, void *fn_data) {
struct mg_connection *c = mg_alloc_conn(mgr);
if (c != NULL) {
c->fd = (void *) (size_t) fd;
c->fn = fn;
c->fn_data = fn_data;
MG_EPOLL_ADD(c);
mg_call(c, MG_EV_OPEN, NULL);
LIST_ADD_HEAD(struct mg_connection, &mgr->conns, c);
}
return c;
}
struct mg_timer *mg_timer_add(struct mg_mgr *mgr, uint64_t milliseconds,
unsigned flags, void (*fn)(void *), void *arg) {
struct mg_timer *t = (struct mg_timer *) calloc(1, sizeof(*t));
if (t != NULL) {
mg_timer_init(&mgr->timers, t, milliseconds, flags, fn, arg);
t->id = mgr->timerid++;
}
return t;
}
void mg_mgr_free(struct mg_mgr *mgr) {
struct mg_connection *c;
struct mg_timer *tmp, *t = mgr->timers;
while (t != NULL) tmp = t->next, free(t), t = tmp;
mgr->timers = NULL; // Important. Next call to poll won't touch timers
for (c = mgr->conns; c != NULL; c = c->next) c->is_closing = 1;
mg_mgr_poll(mgr, 0);
#if MG_ENABLE_FREERTOS_TCP
FreeRTOS_DeleteSocketSet(mgr->ss);
#endif
MG_DEBUG(("All connections closed"));
#if MG_ENABLE_EPOLL
if (mgr->epoll_fd >= 0) close(mgr->epoll_fd), mgr->epoll_fd = -1;
#endif
mg_tls_ctx_free(mgr);
}
void mg_mgr_init(struct mg_mgr *mgr) {
memset(mgr, 0, sizeof(*mgr));
#if MG_ENABLE_EPOLL
if ((mgr->epoll_fd = epoll_create1(EPOLL_CLOEXEC)) < 0)
MG_ERROR(("epoll_create1 errno %d", errno));
#else
mgr->epoll_fd = -1;
#endif
#if MG_ARCH == MG_ARCH_WIN32 && MG_ENABLE_WINSOCK
// clang-format off
{ WSADATA data; WSAStartup(MAKEWORD(2, 2), &data); }
// clang-format on
#elif MG_ENABLE_FREERTOS_TCP
mgr->ss = FreeRTOS_CreateSocketSet();
#elif defined(__unix) || defined(__unix__) || defined(__APPLE__)
// Ignore SIGPIPE signal, so if client cancels the request, it
// won't kill the whole process.
signal(SIGPIPE, SIG_IGN);
#endif
mgr->dnstimeout = 3000;
mgr->dns4.url = "udp://8.8.8.8:53";
mgr->dns6.url = "udp://[2001:4860:4860::8888]:53";
}
#ifdef MG_ENABLE_LINES
#line 1 "src/ota_dummy.c"
#endif

2
mongoose.h
View File

@ -1711,6 +1711,8 @@ struct mg_tcpip_if {
void *driver_data; // Driver-specific data
struct mg_mgr *mgr; // Mongoose event manager
struct mg_queue recv_queue; // Receive queue
uint16_t mtu; // Interface MTU
#define MG_TCPIP_MTU_DEFAULT 500
// Internal state, user can use it but should not change it
uint8_t gwmac[6]; // Router's MAC

38
src/net_builtin.c
View File

@ -548,21 +548,43 @@ static struct mg_connection *accept_conn(struct mg_connection *lsn,
return c;
}
static size_t trim_len(struct mg_connection *c, size_t len) {
struct mg_tcpip_if *ifp = (struct mg_tcpip_if *) c->mgr->priv;
size_t eth_h_len = 14, ip_max_h_len = 24, tcp_max_h_len = 60, udp_h_len = 8;
size_t max_headers_len = eth_h_len + ip_max_h_len +
(c->is_udp ? udp_h_len : tcp_max_h_len);
size_t min_mtu = c->is_udp ? 68 /* RFC-791 */ : max_headers_len - eth_h_len;
// If the frame exceeds the available buffer, trim the length
if (len + max_headers_len > ifp->tx.len) {
len = ifp->tx.len - max_headers_len;
}
// Ensure the MTU isn't lower than the minimum allowed value
if (ifp->mtu < min_mtu) {
MG_ERROR(("MTU is lower than minimum possible value. Setting it to %d.",
min_mtu));
ifp->mtu = (uint16_t) min_mtu;
}
// If the total packet size exceeds the MTU, trim the length
if (len + max_headers_len - eth_h_len > ifp->mtu) {
len = ifp->mtu - max_headers_len + eth_h_len;
if (c->is_udp) {
MG_ERROR(("UDP datagram exceeds MTU. Truncating it."));
}
}
return len;
}
long mg_io_send(struct mg_connection *c, const void *buf, size_t len) {
struct mg_tcpip_if *ifp = (struct mg_tcpip_if *) c->mgr->priv;
struct connstate *s = (struct connstate *) (c + 1);
uint32_t rem_ip;
memcpy(&rem_ip, c->rem.ip, sizeof(uint32_t));
len = trim_len(c, len);
if (c->is_udp) {
size_t max_headers_len = 14 + 24 /* max IP */ + 8 /* UDP */;
if (len + max_headers_len > ifp->tx.len) {
len = ifp->tx.len - max_headers_len;
}
tx_udp(ifp, s->mac, ifp->ip, c->loc.port, rem_ip, c->rem.port, buf, len);
} else {
size_t max_headers_len = 14 + 24 /* max IP */ + 60 /* max TCP */;
if (len + max_headers_len > ifp->tx.len)
len = ifp->tx.len - max_headers_len;
if (tx_tcp(ifp, s->mac, rem_ip, TH_PUSH | TH_ACK, c->loc.port, c->rem.port,
mg_htonl(s->seq), mg_htonl(s->ack), buf, len) > 0) {
s->seq += (uint32_t) len;
@ -941,6 +963,7 @@ void mg_tcpip_init(struct mg_mgr *mgr, struct mg_tcpip_if *ifp) {
ifp->timer_1000ms = mg_millis();
mgr->priv = ifp;
ifp->mgr = mgr;
ifp->mtu = MG_TCPIP_MTU_DEFAULT;
mgr->extraconnsize = sizeof(struct connstate);
if (ifp->ip == 0) ifp->enable_dhcp_client = true;
memset(ifp->gwmac, 255, sizeof(ifp->gwmac)); // Set to broadcast
@ -1081,6 +1104,7 @@ bool mg_send(struct mg_connection *c, const void *buf, size_t len) {
mg_error(c, "net down");
} else if (c->is_udp) {
struct connstate *s = (struct connstate *) (c + 1);
len = trim_len(c, len); // Trimming length if necessary
tx_udp(ifp, s->mac, ifp->ip, c->loc.port, rem_ip, c->rem.port, buf, len);
res = true;
} else {

2
src/net_builtin.h
View File

@ -27,6 +27,8 @@ struct mg_tcpip_if {
void *driver_data; // Driver-specific data
struct mg_mgr *mgr; // Mongoose event manager
struct mg_queue recv_queue; // Receive queue
uint16_t mtu; // Interface MTU
#define MG_TCPIP_MTU_DEFAULT 1500
// Internal state, user can use it but should not change it
uint8_t gwmac[6]; // Router's MAC

52
test/mip_test.c
View File

@ -8,6 +8,7 @@
static int s_num_tests = 0;
static bool s_sent_fragment = 0;
static int s_seg_sent = 0;
#define ASSERT(expr) \
do { \
@ -35,6 +36,10 @@ static void ph(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
}
static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
(void) c, (void) ev, (void) ev_data, (void) fn_data;
}
static void frag_recv_fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
if (ev == MG_EV_ERROR) {
if (s_sent_fragment) {
ASSERT(strcmp((char*) ev_data, "Received fragmented packet") == 0);
@ -43,6 +48,21 @@ static void fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
(void) c, (void) ev_data, (void) fn_data;
}
static void frag_send_fn(struct mg_connection *c, int ev, void *ev_data, void *fn_data) {
static bool s_sent;
static int s_seg_sizes[] = {416, 416, 368};
if (ev == MG_EV_POLL) {
if (!s_sent) {
c->send.len = 1200; // setting TCP payload size
s_sent = true;
}
} else if (ev == MG_EV_WRITE) {
// Checking TCP segment sizes (ev_data points to the TCP payload length)
ASSERT(*(int *) ev_data == s_seg_sizes[s_seg_sent++]);
}
(void) c, (void) ev_data, (void) fn_data;
}
static void test_poll(void) {
int count = 0, i;
struct mg_mgr mgr;
@ -217,7 +237,7 @@ static void test_retransmit(void) {
mg_tcpip_free(&mif);
}
static void test_fragmentation(void) {
static void test_frag_recv_path(void) {
struct mg_mgr mgr;
struct eth e;
struct ip ip;
@ -232,7 +252,7 @@ static void test_fragmentation(void) {
mif.driver = &driver;
mif.driver_data = &s_driver_data;
mg_tcpip_init(&mgr, &mif);
mg_http_listen(&mgr, "http://0.0.0.0:0", fn, NULL);
mg_http_listen(&mgr, "http://0.0.0.0:0", frag_recv_fn, NULL);
mgr.conns->pfn = NULL;
mg_mgr_poll(&mgr, 0);
@ -261,6 +281,34 @@ static void test_fragmentation(void) {
mg_tcpip_free(&mif);
}
static void test_frag_send_path(void) {
struct mg_mgr mgr;
struct mg_tcpip_driver driver;
struct mg_tcpip_if mif;
mg_mgr_init(&mgr);
memset(&mif, 0, sizeof(mif));
memset(&s_driver_data, 0, sizeof(struct driver_data));
driver.init = NULL, driver.tx = if_tx, driver.up = if_up, driver.rx = if_rx;
mif.driver = &driver;
mif.driver_data = &s_driver_data;
mg_tcpip_init(&mgr, &mif);
mif.mtu = 500;
mg_http_listen(&mgr, "http://0.0.0.0:0", frag_send_fn, NULL);
mgr.conns->pfn = NULL;
for (int i = 0; i < 10; i++)
mg_mgr_poll(&mgr, 0);
ASSERT(s_seg_sent == 3);
s_driver_data.len = 0;
mg_mgr_free(&mgr);
mg_tcpip_free(&mif);
}
static void test_fragmentation(void) {
test_frag_recv_path();
test_frag_send_path();
}
int main(void) {
test_statechange();
test_poll();