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airscan-wsdd.c
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airscan-wsdd.c
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/* AirScan (a.k.a. eSCL) backend for SANE
*
* Copyright (C) 2019 and up by Alexander Pevzner (pzz@apevzner.com)
* See LICENSE for license terms and conditions
*
* Web Services Dynamic Discovery (WS-Discovery)
*/
#define _GNU_SOURCE
#include "airscan.h"
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <net/if.h>
#include <sys/socket.h>
/* Protocol times, in milliseconds
*/
#define WSDD_RETRANSMIT_MIN 100 /* Min retransmit time */
#define WSDD_RETRANSMIT_MAX 250 /* Max retransmit time */
#define WSDD_DISCOVERY_TIME 2500 /* Overall discovery time */
/* WS-Discovery stable endpoint path
*/
#define WSDD_STABLE_ENDPOINT \
"/StableWSDiscoveryEndpoint/schemas-xmlsoap-org_ws_2005_04_discovery"
/* wsdd_resolver represents a per-interface WSDD resolver
*/
typedef struct {
int fd; /* File descriptor */
int ifindex; /* Interface index */
bool ipv6; /* We are on IPv6 */
eloop_fdpoll *fdpoll; /* Socket fdpoll */
eloop_timer *timer; /* Retransmit timer */
uint32_t total_time; /* Total elapsed time */
ip_straddr str_ifaddr; /* Interface address */
ip_straddr str_sockaddr; /* Per-interface socket address */
bool initscan; /* Initial scan in progress */
} wsdd_resolver;
/* wsdd_finding represents zeroconf_finding for WSD
* device discovery
*/
typedef struct {
zeroconf_finding finding; /* Base class */
const char *address; /* Device "address" in WS-SD sense */
ll_head xaddrs; /* List of wsdd_xaddr */
http_client *http_client; /* HTTP client */
ll_node list_node; /* In wsdd_finding_list */
bool published; /* This finding is published */
} wsdd_finding;
/* wsdd_xaddr represents device transport address
*/
typedef struct {
http_uri *uri; /* Device URI */
ll_node list_node; /* In wsdd_finding::xaddrs */
} wsdd_xaddr;
/* WSDD_ACTION represents WSDD message action
*/
typedef enum {
WSDD_ACTION_UNKNOWN,
WSDD_ACTION_HELLO,
WSDD_ACTION_BYE,
WSDD_ACTION_PROBEMATCHES
} WSDD_ACTION;
/* wsdd_message represents a parsed WSDD message
*/
typedef struct {
WSDD_ACTION action; /* Message action */
const char *address; /* Endpoint reference */
ll_head xaddrs; /* List of wsdd_xaddr */
bool is_scanner; /* Device is scanner */
bool is_printer; /* Device is printer */
} wsdd_message;
/* Forward declarations
*/
static void
wsdd_message_free(wsdd_message *msg);
static void
wsdd_resolver_send_probe (wsdd_resolver *resolver);
static wsdd_resolver*
wsdd_netif_resolver_by_ifindex (int ifindex);
/* Static variables
*/
static log_ctx *wsdd_log;
static netif_notifier *wsdd_netif_notifier;
static netif_addr *wsdd_netif_addr_list;
static int wsdd_mcsock_ipv4 = -1;
static int wsdd_mcsock_ipv6 = -1;
static eloop_fdpoll *wsdd_fdpoll_ipv4;
static eloop_fdpoll *wsdd_fdpoll_ipv6;
static char wsdd_buf[65536];
static struct sockaddr_in wsdd_mcast_ipv4;
static struct sockaddr_in6 wsdd_mcast_ipv6;
static ll_head wsdd_finding_list;
static int wsdd_initscan_count;
static http_client *wsdd_http_client;
static ip_addrset *wsdd_addrs_probing;
/* WS-DD Probe template
*/
static const char *wsdd_probe_template =
"<?xml version=\"1.0\"?>"
"<s:Envelope xmlns:a=\"http://schemas.xmlsoap.org/ws/2004/08/addressing\" xmlns:d=\"http://schemas.xmlsoap.org/ws/2005/04/discovery\" xmlns:s=\"http://www.w3.org/2003/05/soap-envelope\" xmlns:wsdp=\"http://schemas.xmlsoap.org/ws/2006/02/devprof\">"
"<s:Header>"
"<a:Action>http://schemas.xmlsoap.org/ws/2005/04/discovery/Probe</a:Action>"
"<a:MessageID>%s</a:MessageID>"
"<a:To>urn:schemas-xmlsoap-org:ws:2005:04:discovery</a:To>"
"</s:Header>"
"<s:Body>"
"<d:Probe>"
"<d:Types>wsdp:Device</d:Types>"
"</d:Probe>"
"</s:Body>"
"</s:Envelope>";
/* WS-DD Get (metadata) template
*/
static const char *wsdd_get_metadata_template =
"<?xml version=\"1.0\"?>"
"<s:Envelope xmlns:a=\"http://schemas.xmlsoap.org/ws/2004/08/addressing\" xmlns:s=\"http://www.w3.org/2003/05/soap-envelope\">"
"<s:Header>"
"<a:Action>http://schemas.xmlsoap.org/ws/2004/09/transfer/Get</a:Action>"
"<a:MessageID>%s</a:MessageID>"
"<a:To>%s</a:To>"
"<a:ReplyTo>"
"<a:Address>http://schemas.xmlsoap.org/ws/2004/08/addressing/role/anonymous</a:Address>"
"</a:ReplyTo>"
"</s:Header>"
"<s:Body/>"
"</s:Envelope>";
/* XML namespace translation
*/
static const xml_ns wsdd_ns_rules[] = {
{"s", "http*://schemas.xmlsoap.org/soap/envelope"}, /* SOAP 1.1 */
{"s", "http*://www.w3.org/2003/05/soap-envelope"}, /* SOAP 1.2 */
{"d", "http*://schemas.xmlsoap.org/ws/2005/04/discovery"},
{"a", "http*://schemas.xmlsoap.org/ws/2004/08/addressing"},
{"devprof", "http*://schemas.xmlsoap.org/ws/2006/02/devprof"},
{"mex", "http*://schemas.xmlsoap.org/ws/2004/09/mex"},
{"pnpx", "http*://schemas.microsoft.com/windows/pnpx/2005/10"},
{NULL, NULL}
};
/******************** wsdd_xaddr operations ********************/
/* Create new wsdd_xaddr. Newly created wsdd_xaddr takes uri ownership
*/
static wsdd_xaddr*
wsdd_xaddr_new (http_uri *uri)
{
wsdd_xaddr *xaddr = g_new0(wsdd_xaddr, 1);
xaddr->uri = uri;
return xaddr;
}
/* Destroy wsdd_xaddr
*/
static void
wsdd_xaddr_free (wsdd_xaddr *xaddr)
{
http_uri_free(xaddr->uri);
g_free(xaddr);
}
/* Add wsdd_xaddr to the list.
* Takes ownership on URI.
*/
static void
wsdd_xaddr_list_add (ll_head *list, http_uri *uri)
{
wsdd_xaddr *xaddr;
ll_node *node;
/* Check for duplicates */
for (LL_FOR_EACH(node, list)) {
xaddr = OUTER_STRUCT(node, wsdd_xaddr, list_node);
if (http_uri_equal(xaddr->uri, uri)) {
http_uri_free(uri);
return;
}
}
/* Add new xaddr */
xaddr = wsdd_xaddr_new(uri);
ll_push_end(list, &xaddr->list_node);
}
/* Purge list of wsdd_xaddr
*/
static void
wsdd_xaddr_list_purge (ll_head *list)
{
ll_node *node;
while ((node = ll_first(list)) != NULL) {
wsdd_xaddr *xaddr = OUTER_STRUCT(node, wsdd_xaddr, list_node);
ll_del(&xaddr->list_node);
wsdd_xaddr_free(xaddr);
}
}
/******************** wsdd_initscan_count operations ********************/
/* Increment wsdd_initscan_count
*/
static void
wsdd_initscan_count_inc (void)
{
wsdd_initscan_count ++;
}
/* Decrement wsdd_initscan_count
*/
static void
wsdd_initscan_count_dec (void)
{
log_assert(wsdd_log, wsdd_initscan_count > 0);
wsdd_initscan_count --;
if (wsdd_initscan_count == 0) {
zeroconf_finding_done(ZEROCONF_WSD);
}
}
/******************** wsdd_finding operations ********************/
/* Create new wsdd_finding
*/
static wsdd_finding*
wsdd_finding_new (int ifindex, const char *address)
{
wsdd_finding *wsdd = g_new0(wsdd_finding, 1);
wsdd->finding.method = ZEROCONF_WSD;
wsdd->finding.uuid = uuid_parse(address);
if (!uuid_valid(wsdd->finding.uuid)) {
wsdd->finding.uuid = uuid_hash(address);
}
wsdd->finding.ifindex = ifindex;
wsdd->address = g_strdup(address);
ll_init(&wsdd->xaddrs);
wsdd->http_client = http_client_new(wsdd_log, wsdd);
return wsdd;
}
/* Destroy wsdd_finding
*/
static void
wsdd_finding_free (wsdd_finding *wsdd)
{
if (wsdd->published) {
zeroconf_finding_withdraw(&wsdd->finding);
}
http_client_cancel(wsdd->http_client);
http_client_free(wsdd->http_client);
zeroconf_endpoint_list_free(wsdd->finding.endpoints);
g_free((char*) wsdd->address);
wsdd_xaddr_list_purge(&wsdd->xaddrs);
g_free((char*) wsdd->finding.model);
g_free((char*) wsdd->finding.name);
g_free(wsdd);
}
/* Publish wsdd_finding
*/
static void
wsdd_finding_publish (wsdd_finding *wsdd)
{
if (!wsdd->published) {
wsdd->published = true;
zeroconf_finding_publish(&wsdd->finding);
}
}
/* Add wsdd_finding to the wsdd_finding_list.
* If finding already present, does nothing and returns NULL
*/
static wsdd_finding*
wsdd_finding_add (int ifindex, const char *address)
{
ll_node *node;
wsdd_finding *wsdd;
/* Check for duplicates */
for (LL_FOR_EACH(node, &wsdd_finding_list)) {
wsdd = OUTER_STRUCT(node, wsdd_finding, list_node);
if (wsdd->finding.ifindex == ifindex &&
!strcmp(wsdd->address, address)) {
return NULL;
}
}
/* Add new finding */
wsdd = wsdd_finding_new(ifindex, address);
ll_push_end(&wsdd_finding_list, &wsdd->list_node);
return wsdd;
}
/* Lookup wsdd_finding by IP address
*/
static wsdd_finding*
wsdd_finding_by_address (ip_addr addr)
{
ll_node *node, *node2;
wsdd_finding *wsdd;
wsdd_xaddr *xaddr;
const struct sockaddr *sockaddr;
/* Check for duplicates */
for (LL_FOR_EACH(node, &wsdd_finding_list)) {
wsdd = OUTER_STRUCT(node, wsdd_finding, list_node);
for (LL_FOR_EACH(node2, &wsdd->xaddrs)) {
xaddr = OUTER_STRUCT(node2, wsdd_xaddr, list_node);
sockaddr = http_uri_addr(xaddr->uri);
if (sockaddr != NULL) {
ip_addr addr2 = ip_addr_from_sockaddr(sockaddr);
if (ip_addr_equal(addr, addr2)) {
return wsdd;
}
}
}
}
return NULL;
}
/* Delete wsdd_finding from the wsdd_finding_list
*/
static void
wsdd_finding_del (const char *address)
{
ll_node *node;
/* Lookup finding in the list */
for (LL_FOR_EACH(node, &wsdd_finding_list)) {
wsdd_finding *wsdd = OUTER_STRUCT(node, wsdd_finding, list_node);
if (!strcmp(wsdd->address, address)) {
ll_del(&wsdd->list_node);
wsdd_finding_free(wsdd);
return;
}
}
}
/* Delete all findings from the wsdd_finding_list
*/
static void
wsdd_finding_list_purge (void)
{
ll_node *node;
while ((node = ll_first(&wsdd_finding_list)) != NULL) {
wsdd_finding *wsdd = OUTER_STRUCT(node, wsdd_finding, list_node);
ll_del(&wsdd->list_node);
wsdd_finding_free(wsdd);
}
}
/* Parse endpoint addresses from the devprof:Hosted section of the
* device metadata:
* <devprof:Hosted>
* <a:EndpointReference>
* <a:Address>http://192.168.1.102:5358/WSDScanner</a:Address>
* </addressing:EndpointReference>
* <devprof:Types>scan:ScannerServiceType</devprof:Types>
* <devprof:ServiceId>uri:4509a320-00a0-008f-00b6-002507510eca/WSDScanner</devprof:ServiceId>
* <pnpx:CompatibleId>http://schemas.microsoft.com/windows/2006/08/wdp/scan/ScannerServiceType</pnpx:CompatibleId>
* <pnpx:HardwareId>VEN_0103&DEV_069D</pnpx:HardwareId>
* </devprof:Hosted>
*
* It ignores all endpoints except ScannerServiceType, extracts endpoint
* URLs and returns them as slice of strings
*/
static void
wsdd_finding_parse_endpoints (wsdd_finding *wsdd, xml_rd *xml)
{
unsigned int level = xml_rd_depth(xml);
size_t prefixlen = strlen(xml_rd_node_path(xml));
bool is_scanner = false;
zeroconf_endpoint *endpoints = NULL;
while (!xml_rd_end(xml)) {
const char *path = xml_rd_node_path(xml) + prefixlen;
const char *val;
if (!strcmp(path, "/devprof:Types")) {
val = xml_rd_node_value(xml);
if (strstr(val, "ScannerServiceType") != NULL) {
is_scanner = true;
}
} else if (!strcmp(path, "/a:EndpointReference/a:Address")) {
http_uri *uri;
zeroconf_endpoint *ep;
val = xml_rd_node_value(xml);
uri = http_uri_new(val, true);
if (uri != NULL) {
http_uri_fix_ipv6_zone(uri, wsdd->finding.ifindex);
ep = zeroconf_endpoint_new(ID_PROTO_WSD, uri);
ep->next = endpoints;
endpoints = ep;
}
}
xml_rd_deep_next(xml, level);
}
if (!is_scanner) {
zeroconf_endpoint_list_free(endpoints);
return;
}
while (endpoints != NULL) {
zeroconf_endpoint *ep = endpoints;
endpoints = endpoints->next;
ep->next = wsdd->finding.endpoints;
wsdd->finding.endpoints = ep;
}
}
/* Get metadata callback
*/
static void
wsdd_finding_get_metadata_callback (void *ptr, http_query *q)
{
error err;
xml_rd *xml = NULL;
http_data *data;
wsdd_finding *wsdd = ptr;
char *model = NULL, *manufacturer = NULL;
(void) ptr;
/* Check query status */
err = http_query_error(q);
if (err != NULL) {
log_trace(wsdd_log, "metadata query: %s", ESTRING(err));
goto DONE;
}
/* Parse XML */
data = http_query_get_response_data(q);
if (data->size == 0) {
log_trace(wsdd_log, "metadata query: no data");
goto DONE;
}
err = xml_rd_begin(&xml, data->bytes, data->size, wsdd_ns_rules);
if (err != NULL) {
log_trace(wsdd_log, "metadata query: %s", ESTRING(err));
goto DONE;
}
/* Decode XML */
while (!xml_rd_end(xml)) {
const char *path = xml_rd_node_path(xml);
if (!strcmp(path, "s:Envelope/s:Body/mex:Metadata/mex:MetadataSection"
"/devprof:Relationship/devprof:Hosted")) {
wsdd_finding_parse_endpoints(wsdd, xml);
} else if (!strcmp(path, "s:Envelope/s:Body/mex:Metadata/mex:MetadataSection"
"/devprof:ThisModel/devprof:Manufacturer")) {
if (manufacturer == NULL) {
manufacturer = g_strdup(xml_rd_node_value(xml));
}
} else if (!strcmp(path, "s:Envelope/s:Body/mex:Metadata/mex:MetadataSection"
"/devprof:ThisModel/devprof:ModelName")) {
if (model == NULL) {
model = g_strdup(xml_rd_node_value(xml));
}
}
xml_rd_deep_next(xml, 0);
}
if (wsdd->finding.model == NULL) {
if (model != NULL && manufacturer != NULL) {
wsdd->finding.model = g_strdup_printf("%s %s", manufacturer, model);
} else if (model != NULL) {
wsdd->finding.model = model;
model = NULL;
} else if (manufacturer != NULL) {
wsdd->finding.model = manufacturer;
manufacturer = NULL;
} else {
wsdd->finding.model = g_strdup(wsdd->address);
}
}
/* Cleanup and exit */
DONE:
xml_rd_finish(&xml);
g_free(model);
g_free(manufacturer);
if (http_client_num_pending(wsdd->http_client) == 0) {
zeroconf_endpoint *endpoint;
wsdd->finding.endpoints = zeroconf_endpoint_list_sort_dedup(
wsdd->finding.endpoints);
log_debug(wsdd_log, "\"%s\": address: %s",
wsdd->finding.model, wsdd->address);
log_debug(wsdd_log, "\"%s\": uuid: %s",
wsdd->finding.model, wsdd->finding.uuid.text);
log_debug(wsdd_log, "\"%s\": discovered endpoints:",
wsdd->finding.model);
for (endpoint = wsdd->finding.endpoints; endpoint != NULL;
endpoint = endpoint->next) {
log_debug(wsdd_log, " %s", http_uri_str(endpoint->uri));
}
wsdd_finding_publish(wsdd);
}
}
/* Query device metadata
*/
static void
wsdd_finding_get_metadata (wsdd_finding *wsdd, int ifindex, wsdd_xaddr *xaddr)
{
uuid u = uuid_rand();
http_query *q;
log_trace(wsdd_log, "querying metadata from %s", http_uri_str(xaddr->uri));
sprintf(wsdd_buf, wsdd_get_metadata_template, u.text, wsdd->address);
q = http_query_new(wsdd->http_client, http_uri_clone(xaddr->uri),
"POST", g_strdup(wsdd_buf), "application/soap+xml; charset=utf-8");
http_query_set_uintptr(q, ifindex);
http_query_submit(q, wsdd_finding_get_metadata_callback);
}
/******************** wsdd_message operations ********************/
/* Parse transport addresses. Universal function
* for Hello/Bye/ProbeMatch message
*/
static void
wsdd_message_parse_endpoint (wsdd_message *msg, xml_rd *xml)
{
unsigned int level = xml_rd_depth(xml);
char *xaddrs_text = NULL;
size_t prefixlen = strlen(xml_rd_node_path(xml));
while (!xml_rd_end(xml)) {
const char *path = xml_rd_node_path(xml) + prefixlen;
const char *val;
if (!strcmp(path, "/d:Types")) {
val = xml_rd_node_value(xml);
msg->is_scanner = !!strstr(val, "ScanDeviceType");
msg->is_printer = !!strstr(val, "PrintDeviceType");
} else if (!strcmp(path, "/d:XAddrs")) {
g_free(xaddrs_text);
xaddrs_text = g_strdup(xml_rd_node_value(xml));
} else if (!strcmp(path, "/a:EndpointReference/a:Address")) {
g_free((char*) msg->address);
msg->address = g_strdup(xml_rd_node_value(xml));
}
xml_rd_deep_next(xml, level);
}
if (xaddrs_text != NULL) {
char *tok, *saveptr;
static const char *delim = "\t\n\v\f\r \x85\xA0";
for (tok = strtok_r(xaddrs_text, delim, &saveptr); tok != NULL;
tok = strtok_r(NULL, delim, &saveptr)) {
http_uri *uri = http_uri_new(tok, true);
if (uri != NULL) {
wsdd_xaddr_list_add(&msg->xaddrs, uri);
}
}
}
g_free(xaddrs_text);
}
/* Parse WSDD message
*/
static wsdd_message*
wsdd_message_parse (const char *xml_text, size_t xml_len)
{
wsdd_message *msg = g_new0(wsdd_message, 1);
xml_rd *xml;
error err;
ll_init(&msg->xaddrs);
err = xml_rd_begin(&xml, xml_text, xml_len, wsdd_ns_rules);
if (err != NULL) {
goto DONE;
}
while (!xml_rd_end(xml)) {
const char *path = xml_rd_node_path(xml);
const char *val;
if (!strcmp(path, "s:Envelope/s:Header/a:Action")) {
val = xml_rd_node_value(xml);
if (strstr(val, "Hello")) {
msg->action = WSDD_ACTION_HELLO;
} else if (strstr(val, "Bye")) {
msg->action = WSDD_ACTION_BYE;
} else if (strstr(val, "ProbeMatches")) {
msg->action = WSDD_ACTION_PROBEMATCHES;
}
} else if (!strcmp(path, "s:Envelope/s:Body/d:Hello") ||
!strcmp(path, "s:Envelope/s:Body/d:Bye") ||
!strcmp(path, "s:Envelope/s:Body/d:ProbeMatches/d:ProbeMatch")) {
wsdd_message_parse_endpoint(msg, xml);
}
xml_rd_deep_next(xml, 0);
}
DONE:
xml_rd_finish(&xml);
if (err != NULL ||
msg->action == WSDD_ACTION_UNKNOWN ||
msg->address == NULL ||
(msg->action == WSDD_ACTION_HELLO && ll_empty(&msg->xaddrs)) ||
(msg->action == WSDD_ACTION_PROBEMATCHES && ll_empty(&msg->xaddrs))) {
wsdd_message_free(msg);
msg = NULL;
}
return msg;
}
/* Free wsdd_message
*/
static void
wsdd_message_free (wsdd_message *msg)
{
if (msg != NULL) {
g_free((char*) msg->address);
wsdd_xaddr_list_purge(&msg->xaddrs);
g_free(msg);
}
}
/* Get message action name, for debugging
*/
static const char*
wsdd_message_action_name (const wsdd_message *msg)
{
switch (msg->action) {
case WSDD_ACTION_UNKNOWN:
break;
case WSDD_ACTION_HELLO: return "Hello";
case WSDD_ACTION_BYE: return "Bye";
case WSDD_ACTION_PROBEMATCHES: return "ProbeMatches";
}
return "UNKNOWN";
}
/******************** wsdd_resolver operations ********************/
/* Dispatch received WSDD message
*/
static void
wsdd_resolver_message_dispatch (wsdd_resolver *resolver,
wsdd_message *msg, const char *from)
{
wsdd_finding *wsdd;
wsdd_xaddr *xaddr;
ll_node *node;
/* Fixup ipv6 zones */
for (LL_FOR_EACH(node, &msg->xaddrs)) {
xaddr = OUTER_STRUCT(node, wsdd_xaddr, list_node);
http_uri_fix_ipv6_zone(xaddr->uri, resolver->ifindex);
}
/* Write trace messages */
log_trace(wsdd_log, "%s message received from %s:",
wsdd_message_action_name(msg), from);
log_trace(wsdd_log, " address: %s", msg->address);
log_trace(wsdd_log, " is_scanner: %s", msg->is_scanner ? "yes" : "no");
log_trace(wsdd_log, " is_printer: %s", msg->is_printer ? "yes" : "no");
for (LL_FOR_EACH(node, &msg->xaddrs)) {
xaddr = OUTER_STRUCT(node, wsdd_xaddr, list_node);
log_trace(wsdd_log, " xaddr: %s", http_uri_str(xaddr->uri));
}
/* Handle the message */
switch (msg->action) {
case WSDD_ACTION_HELLO:
case WSDD_ACTION_PROBEMATCHES:
/* Ignore devices that are neither scanner not printer */
if (!(msg->is_scanner || msg->is_printer)) {
log_trace(wsdd_log,
"skipped: device is neither scanner not printer");
goto DONE;
}
/* Add a finding. Do nothing if device already exist */
wsdd = wsdd_finding_add(resolver->ifindex, msg->address);
if (wsdd == NULL) {
goto DONE;
}
/* If device is not scanner or (which is very unlikely)
* has no xaddrs, just publish it without endpoints,
* so zeroconf stuff will know that there is no need to
* wait anymore for a device with this UUID, and we
* are done
*/
if (!msg->is_scanner || ll_empty(&msg->xaddrs)) {
wsdd_finding_publish(wsdd);
goto DONE;
}
/* Initiate metadata query */
ll_cat(&wsdd->xaddrs, &msg->xaddrs);
for (LL_FOR_EACH(node, &wsdd->xaddrs)) {
xaddr = OUTER_STRUCT(node, wsdd_xaddr, list_node);
wsdd_finding_get_metadata(wsdd, resolver->ifindex, xaddr);
}
break;
case WSDD_ACTION_BYE:
wsdd_finding_del(msg->address);
break;
default:
break;
}
/* Cleanup and exit */
DONE:
wsdd_message_free(msg);
}
/* Resolver read callback
*/
static void
wsdd_resolver_read_callback (int fd, void *data, ELOOP_FDPOLL_MASK mask)
{
struct sockaddr_storage from, to;
socklen_t tolen = sizeof(to);
ip_straddr str_from, str_to;
int rc;
wsdd_message *msg;
struct iovec vec = {wsdd_buf, sizeof(wsdd_buf)};
uint8_t aux[8192];
struct cmsghdr *cmsg;
int ifindex = 0;
wsdd_resolver *resolver;
struct msghdr msghdr = {
.msg_name = &from,
.msg_namelen = sizeof(from),
.msg_iov = &vec,
.msg_iovlen = 1,
.msg_control = aux,
.msg_controllen = sizeof(aux)
};
(void) mask;
(void) data;
/* Receive a packet */
rc = recvmsg(fd, &msghdr, 0);
if (rc <= 0) {
return;
}
/* Fetch interface index from auxiliary data */
for (cmsg = CMSG_FIRSTHDR(&msghdr); cmsg != NULL;
cmsg = CMSG_NXTHDR(&msghdr, cmsg)) {
if (cmsg->cmsg_level == IPPROTO_IPV6 &&
cmsg->cmsg_type == IPV6_PKTINFO) {
struct in6_pktinfo *pkt = (struct in6_pktinfo*) CMSG_DATA(cmsg);
ifindex = pkt->ipi6_ifindex;
} else if (cmsg->cmsg_level == IPPROTO_IP &&
cmsg->cmsg_type == IP_PKTINFO) {
struct in_pktinfo *pkt = (struct in_pktinfo*) CMSG_DATA(cmsg);
ifindex = pkt->ipi_ifindex;
}
}
str_from = ip_straddr_from_sockaddr((struct sockaddr*) &from);
getsockname(fd, (struct sockaddr*) &to, &tolen);
str_to = ip_straddr_from_sockaddr((struct sockaddr*) &to);
log_trace(wsdd_log, "%d bytes received: %s->%s", rc,
str_from.text, str_to.text);
log_trace_data(wsdd_log, "application/xml", wsdd_buf, rc);
/* Lookup resolver by interface index */
resolver = wsdd_netif_resolver_by_ifindex(ifindex);
if (resolver == NULL) {
return;
}
/* Parse and dispatch the message */
msg = wsdd_message_parse(wsdd_buf, rc);
if (msg != NULL) {
wsdd_resolver_message_dispatch(resolver, msg, "UDP");
}
}
/* Retransmit timer callback
*/
static void
wsdd_resolver_timer_callback (void *data)
{
wsdd_resolver *resolver = data;
resolver->timer = NULL;
if (resolver->total_time >= WSDD_DISCOVERY_TIME) {
eloop_fdpoll_free(resolver->fdpoll);
close(resolver->fd);
resolver->fdpoll = NULL;
resolver->fd = -1;
log_debug(wsdd_log, "%s: done discovery", resolver->str_ifaddr.text);
if (resolver->initscan) {
resolver->initscan = false;
wsdd_initscan_count_dec();
}
} else {
wsdd_resolver_send_probe(resolver);
};
}
/* Set retransmit timer
*/
static void
wsdd_resolver_timer_set (wsdd_resolver *resolver)
{
uint32_t t;
log_assert(wsdd_log, resolver->timer == NULL);
if (resolver->total_time + WSDD_RETRANSMIT_MAX >= WSDD_DISCOVERY_TIME) {
t = WSDD_DISCOVERY_TIME - resolver->total_time;
} else {
t = math_rand_range(WSDD_RETRANSMIT_MIN, WSDD_RETRANSMIT_MAX);
}
resolver->total_time += t;
resolver->timer = eloop_timer_new(t,
wsdd_resolver_timer_callback, resolver);
}
/* Send probe
*/
static void
wsdd_resolver_send_probe (wsdd_resolver *resolver)
{
uuid u = uuid_rand();
int n = sprintf(wsdd_buf, wsdd_probe_template, u.text);
int rc;
struct sockaddr *addr;
socklen_t addrlen;
ip_straddr straddr;
if (resolver->ipv6) {
addr = (struct sockaddr*) &wsdd_mcast_ipv6;
addrlen = sizeof(wsdd_mcast_ipv6);
} else {
addr = (struct sockaddr*) &wsdd_mcast_ipv4;
addrlen = sizeof(wsdd_mcast_ipv4);
}
straddr = ip_straddr_from_sockaddr(addr);
log_trace(wsdd_log, "probe sent: %s->%s",
resolver->str_sockaddr.text, straddr.text);
log_trace_data(wsdd_log, "application/xml", wsdd_buf, n);
rc = sendto(resolver->fd, wsdd_buf, n, 0, addr, addrlen);
if (rc < 0) {
log_debug(wsdd_log, "send_probe: %s", strerror(errno));
}
wsdd_resolver_timer_set(resolver);
}
/* Create wsdd_resolver
*/
static wsdd_resolver*
wsdd_resolver_new (const netif_addr *addr, bool initscan)
{
wsdd_resolver *resolver = g_new0(wsdd_resolver, 1);
int af = addr->ipv6 ? AF_INET6 : AF_INET;
const char *af_name = addr->ipv6 ? "AF_INET6" : "AF_INET";
int rc;
static int no = 0, yes = 1;
uint16_t port;
/* Build resolver structure */
resolver->ifindex = addr->ifindex;
/* Open a socket */
resolver->ipv6 = addr->ipv6;
resolver->fd = socket(af, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0);
if (resolver->fd < 0) {
log_debug(wsdd_log, "socket(%s): %s", af_name, strerror(errno));
goto FAIL;
}
/* Set socket options */
if (addr->ipv6) {
rc = setsockopt(resolver->fd, IPPROTO_IPV6, IPV6_MULTICAST_IF,
&addr->ifindex, sizeof(addr->ifindex));
if (rc < 0) {
log_debug(wsdd_log, "setsockopt(AF_INET6,IPV6_MULTICAST_IF): %s",
strerror(errno));
goto FAIL;
}
rc = setsockopt(resolver->fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
&yes, sizeof(yes));
if (rc < 0) {
log_debug(wsdd_log, "setsockopt(IPPROTO_IPV6,IPV6_RECVPKTINFO): %s",
strerror(errno));
goto FAIL;
}
/* Note: error is not a problem here */
setsockopt(resolver->fd, IPPROTO_IPV6, IPV6_MULTICAST_LOOP,
&no, sizeof(no));
} else {
rc = setsockopt(resolver->fd, IPPROTO_IP, IP_MULTICAST_IF,
&addr->ip.v4, sizeof(addr->ip.v4));
if (rc < 0) {
log_debug(wsdd_log, "setsockopt(AF_INET,IP_MULTICAST_IF): %s",
strerror(errno));
goto FAIL;
}
rc = setsockopt(resolver->fd, IPPROTO_IP, IP_PKTINFO,
&yes, sizeof(yes));
if (rc < 0) {
log_debug(wsdd_log, "setsockopt(AF_INET,IP_PKTINFO): %s",
strerror(errno));
goto FAIL;
}
/* Note: error is not a problem here */
setsockopt(resolver->fd, IPPROTO_IP, IP_MULTICAST_LOOP,
&no, sizeof(no));
}
/* Bind the socket */
if (addr->ipv6) {
struct sockaddr_in6 a;
socklen_t alen = sizeof(a);
memset(&a, 0, sizeof(a));
a.sin6_family = AF_INET6;
a.sin6_addr = addr->ip.v6;
a.sin6_scope_id = addr->ifindex;
resolver->str_ifaddr = ip_straddr_from_ip(AF_INET6, &addr->ip);
rc = bind(resolver->fd, (struct sockaddr*) &a, sizeof(a));
getsockname(resolver->fd, (struct sockaddr*) &a, &alen);
port = a.sin6_port;
resolver->str_sockaddr = ip_straddr_from_sockaddr((struct sockaddr*) &a);
} else {
struct sockaddr_in a;
socklen_t alen = sizeof(a);
memset(&a, 0, sizeof(a));
a.sin_family = AF_INET;
a.sin_addr = addr->ip.v4;
resolver->str_ifaddr = ip_straddr_from_ip(AF_INET, &addr->ip);