pstreamer / src / net_helper-udp.c @ 662a3ab9
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/*
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* Copyright (c) 2010 Luca Abeni
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* Copyright (c) 2010 Csaba Kiraly
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* Copyright (c) 2010 Alessandro Russo
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* Copyright (c) 2017 Luca Baldesi
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*
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* This is free software; see lgpl-2.1.txt
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*/
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#include <sys/types.h> |
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#include <unistd.h> |
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#include <errno.h> |
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#include <stdlib.h> |
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#include <stdint.h> |
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#include <stdio.h> |
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#include <string.h> |
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#include <pstreamer_event.h> |
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#ifndef _WIN32
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#include <sys/socket.h> |
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#include <netinet/in.h> |
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#include <netdb.h> |
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#include <arpa/inet.h> |
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#else
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#define _WIN32_WINNT 0x0501 /* WINNT>=0x501 (WindowsXP) for supporting getaddrinfo/freeaddrinfo.*/ |
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#include "win32-net.h" |
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#endif
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#include "net_helper.h" |
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struct nodeID {
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struct sockaddr_storage addr;
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uint16_t occurrences; |
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int fd;
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}; |
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int wait4data(const struct nodeID *s, struct timeval *tout, int *user_fds) |
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/* returns 0 if timeout expires
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* returns -1 in case of error of the select function
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* retruns 1 if the nodeID file descriptor is ready to be read
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* (i.e., some data is ready from the network socket)
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* returns 2 if some of the user_fds file descriptors is ready
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*/
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{
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fd_set fds; |
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int i, res, max_fd;
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FD_ZERO(&fds); |
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if (s && s->fd >= 0) { |
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max_fd = s->fd; |
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FD_SET(s->fd, &fds); |
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} else {
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max_fd = -1;
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} |
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if (user_fds) {
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for (i = 0; user_fds[i] != -1; i++) { |
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FD_SET(user_fds[i], &fds); |
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if (user_fds[i] > max_fd) {
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max_fd = user_fds[i]; |
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} |
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} |
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} |
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res = select(max_fd + 1, &fds, NULL, NULL, tout); |
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if (res <= 0) { |
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return res;
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} |
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if (s && FD_ISSET(s->fd, &fds)) {
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return 1; |
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} |
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/* If execution arrives here, user_fds cannot be 0
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(an FD is ready, and it's not s->fd) */
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for (i = 0; user_fds[i] != -1; i++) { |
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if (!FD_ISSET(user_fds[i], &fds)) {
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user_fds[i] = -2;
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} |
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} |
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return 2; |
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} |
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int register_network_fds(const struct nodeID *s, fd_register_f func, void *handler) |
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{
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if (s)
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func(handler, s->fd, 'r');
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return 0; |
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} |
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struct nodeID *create_node(const char *IPaddr, int port) |
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{
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struct nodeID *s = NULL; |
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int error = 0; |
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struct addrinfo hints, *result = NULL; |
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if (IPaddr && port > 0) |
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{
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memset(&hints, 0, sizeof(hints)); |
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hints.ai_family = AF_UNSPEC; |
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hints.ai_flags = AI_NUMERICHOST; |
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s = malloc(sizeof(struct nodeID)); |
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memset(s, 0, sizeof(struct nodeID)); |
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s->occurrences = 1;
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s->fd = -1;
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if ((error = getaddrinfo(IPaddr, NULL, &hints, &result)) == 0) |
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{
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s->addr.ss_family = result->ai_family; |
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switch (result->ai_family) {
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case (AF_INET):
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((struct sockaddr_in *)&s->addr)->sin_port = htons(port);
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error = inet_pton (result->ai_family, IPaddr, &((struct sockaddr_in *)&s->addr)->sin_addr);
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if (error > 0) |
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error = 0;
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break;
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case (AF_INET6):
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((struct sockaddr_in6 *)&s->addr)->sin6_port = htons(port);
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error = inet_pton (result->ai_family, IPaddr, &(((struct sockaddr_in6 *) &s->addr)->sin6_addr));
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if (error > 0) |
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error = 0;
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break;
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default:
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fprintf(stderr, "Cannot resolve address family %d for '%s'\n", result->ai_family, IPaddr);
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error = -1;
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} |
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} |
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} |
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if (error)
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{
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fprintf(stderr, "Cannot resolve hostname '%s'\n", IPaddr);
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nodeid_free(s); |
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s = NULL;
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} |
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if (result)
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freeaddrinfo(result); |
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return s;
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} |
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struct nodeID *net_helper_init(const char *my_addr, int port, const char *config) |
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{
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int res;
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struct nodeID *myself = NULL;; |
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if (my_addr && port > 0) |
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{
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myself = create_node(my_addr, port); |
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if (myself)
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myself->fd = socket(myself->addr.ss_family, SOCK_DGRAM, 0);
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if (myself && myself->fd >= 0) |
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switch (myself->addr.ss_family)
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{
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case (AF_INET):
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res = bind(myself->fd, (struct sockaddr *)&myself->addr, sizeof(struct sockaddr_in)); |
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break;
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case (AF_INET6):
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res = bind(myself->fd, (struct sockaddr *)&myself->addr, sizeof(struct sockaddr_in6)); |
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break;
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default:
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fprintf(stderr, "Cannot resolve address family %d in bind\n", myself->addr.ss_family);
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res = -1;
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break;
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} |
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if (myself && (myself->fd < 0 || res < 0)) |
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{
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nodeid_free(myself); |
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myself = NULL;
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} |
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} |
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return myself;
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} |
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void bind_msg_type (uint8_t msgtype)
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{
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} |
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int send_to_peer(const struct nodeID *from, const struct nodeID *to, const uint8_t *buffer_ptr, int buffer_size) |
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{
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return sendto(from->fd, buffer_ptr, buffer_size, MSG_CONFIRM, (const struct sockaddr *)&(to->addr), sizeof(struct sockaddr_storage)); |
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} |
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int recv_from_peer(const struct nodeID *local, struct nodeID **remote, uint8_t *buffer_ptr, int buffer_size) |
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{
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struct nodeID * node;
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int res;
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socklen_t len; |
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node = malloc(sizeof(struct nodeID)); |
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memset(node, 0, sizeof(struct nodeID)); |
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node->occurrences = 1;
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node->fd = -1;
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len = sizeof(struct nodeID); |
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res = recvfrom(local->fd, buffer_ptr, buffer_size, 0, (struct sockaddr *)&(node->addr), &len); |
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if (res <=0 ) |
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{
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nodeid_free(node); |
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node = NULL;
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} |
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*remote = node; |
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return res;
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} |
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int node_addr(const struct nodeID *s, char *addr, int len) |
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{
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int n = -1; |
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if (addr && len > 0) |
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{
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if (s)
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{
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n = nodeid_dump((uint8_t *) addr, s, len); |
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if (n>0) |
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addr[n-1] = '\0'; |
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} else
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n = snprintf(addr, len , "None");
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} |
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return n;
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} |
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struct nodeID *nodeid_dup(const struct nodeID *s) |
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{
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struct nodeID * n;
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n = (struct nodeID *) s;
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if (n)
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n->occurrences++; |
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return n;
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} |
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int nodeid_equal(const struct nodeID *s1, const struct nodeID *s2) |
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{
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if (s1 && s2)
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return (nodeid_cmp(s1, s2) == 0) ? 1 : 0; |
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return 0; |
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} |
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int nodeid_cmp(const struct nodeID *s1, const struct nodeID *s2) |
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{
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char ip1[INET6_ADDRSTRLEN], ip2[INET6_ADDRSTRLEN];
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int res = 0; |
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if (s1 && s2 && (s1 != s2))
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{
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node_ip(s1, ip1, INET6_ADDRSTRLEN); |
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node_ip(s2, ip2, INET6_ADDRSTRLEN); |
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res = strcmp(ip1, ip2); |
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if (res == 0) |
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res = node_port(s1) - node_port(s2); |
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} else {
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if (s1 && !s2)
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res = 1;
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if (s2 && !s1)
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res = -1;
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} |
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return res;
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} |
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int nodeid_dump(uint8_t *b, const struct nodeID *s, size_t max_write_size) |
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{
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char ip[INET6_ADDRSTRLEN];
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int port;
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int res = -1; |
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if (s && b)
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{
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node_ip(s, ip, INET6_ADDRSTRLEN); |
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port = node_port(s); |
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if (max_write_size >= strlen(ip) + 1 + 5) |
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res = sprintf((char *)b, "%s:%d-", ip, port); |
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} |
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return res;
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} |
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struct nodeID *nodeid_undump(const uint8_t *b, int *len) |
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{
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char * ptr;
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char * socket;
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int port;
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struct nodeID *res = NULL; |
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if (b && len)
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{
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ptr = strchr((const char *) b, '-'); |
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*len = ptr-(char *)b + 1; |
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socket = malloc(sizeof(char) * (*len)); |
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memmove(socket, b, sizeof(char) * (*len)); |
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socket[(*len)-1] = '\0'; |
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ptr = strrchr(socket, ':');
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port = atoi(ptr+1);
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*ptr = '\0';
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res = create_node(socket, port); |
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free(socket); |
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} |
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return res;
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} |
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void nodeid_free(struct nodeID *s) |
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{
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if (s)
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{
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s->occurrences--; |
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if (s->occurrences == 0) |
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{
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if (s->fd >= 0) |
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close(s->fd); |
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free(s); |
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} |
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} |
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} |
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int node_ip(const struct nodeID *s, char *ip, int len) |
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{
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const char *res = NULL; |
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switch (s->addr.ss_family)
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{
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case AF_INET:
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res = inet_ntop(s->addr.ss_family, &((const struct sockaddr_in *)&s->addr)->sin_addr, ip, len); |
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break;
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case AF_INET6:
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res = inet_ntop(s->addr.ss_family, &((const struct sockaddr_in6 *)&s->addr)->sin6_addr, ip, len); |
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break;
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} |
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if (!res && len)
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ip[0] = '\0'; |
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return res ? 0 : -1; |
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} |
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int node_port(const struct nodeID *s) |
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{
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int res = -1; |
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switch (s->addr.ss_family) {
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case AF_INET:
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res = ntohs(((const struct sockaddr_in *) &s->addr)->sin_port); |
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break;
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case AF_INET6:
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res = ntohs(((const struct sockaddr_in6 *)&s->addr)->sin6_port); |
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break;
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} |
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return res;
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} |