#include "crypt.h"
#include "net.h"
#include "string.h"
+#include "list.h"
#include "fd.h"
/**
return "UNKNOWN PROTOCOL";
}
+/**
+ * Flowopts: Transport-layer independent encapsulation of socket options.
+ *
+ * These collect individual socket options into a queue, which is disposed of
+ * directly after makesock(). The 'pre_conn_opt' structure is for internal use
+ * only and should not be visible elsewhere.
+ *
+ * \sa setsockopt(2), makesock()
+ */
+struct pre_conn_opt {
+ int sock_level; /**< Second argument to setsockopt() */
+ int sock_option; /**< Third argument to setsockopt() */
+ char *opt_name; /**< Stringified \a sock_option */
+ void *opt_val; /**< Fourth argument to setsockopt() */
+ socklen_t opt_len; /**< Fifth argument to setsockopt() */
+
+ struct list_head node; /**< FIFO, as sockopt order matters. */
+};
+
+/** FIFO list of pre-connection socket options to be set */
+struct flowopts {
+ struct list_head sockopts;
+};
+
+struct flowopts *flowopt_new(void)
+{
+ struct flowopts *new = para_malloc(sizeof(*new));
+
+ INIT_LIST_HEAD(&new->sockopts);
+ return new;
+}
+
+/**
+ * Append new socket option to flowopt queue.
+ *
+ * \param fo The flowopt queue to append to.
+ * \param lev Level at which \opt resides.
+ * \param opt New option to add.
+ * \param name Stringified name of \a opt.
+ * \param val The value to set \a opt to.
+ * \param len Length of \a val.
+ *
+ * \sa setsockopt(2)
+ */
+void flowopt_add(struct flowopts *fo, int lev, int opt,
+ char *name, const void *val, int len)
+{
+ struct pre_conn_opt *new = para_malloc(sizeof(*new));
+
+ new->sock_option = opt;
+ new->sock_level = lev;
+ new->opt_name = para_strdup(name);
+
+ if (val == NULL) {
+ new->opt_val = NULL;
+ new->opt_len = 0;
+ } else {
+ new->opt_val = para_malloc(len);
+ new->opt_len = len;
+ memcpy(new->opt_val, val, len);
+ }
+
+ list_add_tail(&new->node, &fo->sockopts);
+}
+
+void flowopt_add_bool(struct flowopts *fo, int lev, int opt,
+ char *optname, bool on_or_off)
+{
+ int on = on_or_off; /* kernel takes 'int' */
+
+ flowopt_add(fo, lev, opt, optname, &on, sizeof(on));
+}
+
+/** Set the entire bunch of pre-connection options at once. */
+static void flowopt_setopts(int sockfd, struct flowopts *fo)
+{
+ struct pre_conn_opt *pc;
+
+ if (fo == NULL)
+ return;
+
+ list_for_each_entry(pc, &fo->sockopts, node)
+ if (setsockopt(sockfd, pc->sock_level, pc->sock_option,
+ pc->opt_val, pc->opt_len) < 0) {
+ PARA_EMERG_LOG("Can not set %s socket option: %s",
+ pc->opt_name, strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+}
+
+static void flowopt_cleanup(struct flowopts *fo)
+{
+ struct pre_conn_opt *cur, *next;
+
+ if (fo == NULL)
+ return;
+
+ list_for_each_entry_safe(cur, next, &fo->sockopts, node) {
+ free(cur->opt_name);
+ free(cur->opt_val);
+ free(cur);
+ }
+ free(fo);
+}
+
/**
* Resolve IPv4/IPv6 address and create a ready-to-use active or passive socket.
*
* \param passive Whether this is a passive (1) or active (0) socket.
* \param host Remote or local hostname or IPv/6 address string.
* \param port_number Decimal port number.
+ * \param fo Socket options to be set before making the connection.
*
* This creates a ready-made IPv4/v6 socket structure after looking up the
* necessary parameters. The interpretation of \a host depends on the value of
*
* Furthermore, bind(2) is called on passive sockets, and connect(2) on active
* sockets. The algorithm tries all possible address combinations until it
- * succeeds.
+ * succeeds. If \a fo is supplied, options are set and cleanup is performed.
*
* \return This function returns 1 on success and \a -E_ADDRESS_LOOKUP when no
* matching connection could be set up (with details in the error log).
* \sa ipv6(7), getaddrinfo(3), bind(2), connect(2).
*/
int makesock(unsigned l3type, unsigned l4type, int passive,
- const char *host, unsigned short port_number)
+ const char *host, unsigned short port_number,
+ struct flowopts *fo)
{
struct addrinfo *local = NULL, *src,
*remote = NULL, *dst, hints;
strerror(errno));
return -ERRNO_TO_PARA_ERROR(errno);
}
+ flowopt_setopts(sockfd, fo);
if (src) {
if (bind(sockfd, src->ai_addr, src->ai_addrlen) < 0) {
freeaddrinfo(local);
if (remote)
freeaddrinfo(remote);
+ flowopt_cleanup(fo);
if (src == NULL && dst == NULL) {
PARA_ERROR_LOG("can not create %s socket %s#%s.\n",
*/
int para_listen(unsigned l3type, unsigned l4type, unsigned short port)
{
- int ret, fd = makesock(l3type, l4type, 1, NULL, port);
+ int ret, fd = makesock(l3type, l4type, 1, NULL, port, NULL);
if (fd > 0) {
ret = listen(fd, BACKLOG);
*/
const uint8_t *dccp_available_ccids(uint8_t *ccids, uint8_t *nccids)
{
- int fd = makesock(AF_UNSPEC, IPPROTO_DCCP, 0, NULL, 0);
+ int fd = makesock(AF_UNSPEC, IPPROTO_DCCP, 1, NULL, 0, NULL);
if (fd < 0)
return NULL;
/** \endcond */
+/**
+ * Flowopts: Transport-layer independent encapsulation of socket options
+ * that need to be registered prior to setting up a connection.
+ */
+struct flowopts;
+
+extern struct flowopts *flowopt_new(void);
+extern void flowopt_add(struct flowopts *fo, int level, int opt,
+ char *name, const void *val, int len);
+extern void flowopt_add_bool(struct flowopts *fo, int lev, int opt,
+ char *optname, bool on_or_off);
+/** Flowopt shortcut macros */
+#define OPT_ADD(fo, lev, opt, val, len) flowopt_add(fo, lev, opt, #opt, val, len)
+#define OPT_ENABLE(fo, lev, opt) flowopt_add_bool(fo, lev, opt, #opt, 1)
+#define OPT_DISABLE(fo, lev, opt) flowopt_add_bool(fo, lev, opt, #opt, 0)
+
/**
* Functions to parse and validate (parts of) URLs.
*/
* Generic socket creation (passive and active sockets).
*/
extern int makesock(unsigned l3type, unsigned l4type, int passive,
- const char *host, unsigned short port_number);
+ const char *host, unsigned short port_number,
+ struct flowopts *fo);
extern struct in_addr extract_v4_addr(const struct sockaddr_storage *ss);
/**
projects / paraslash.git / commitdiff