7 #include <netinet/in.h>
8 #include <sys/socket.h>
11 #include "psmb_priv.h"
14 static void dummy_log(void *log_priv, int priority, const char *format, ...) {}
16 psmb_ctx_t *psmb_new(void)
18 return psmb_new_mm(malloc, free, realloc);
21 psmb_ctx_t *psmb_new_mm(void *(*malloc)(size_t size),
22 void (*free)(void *ptr),
23 void *(*realloc)(void *ptr, size_t size))
25 psmb_ctx_t *ctx = (*malloc)(sizeof(psmb_ctx_t));
28 LOG(ctx, LOG_ERR, "failed to allocate psmb_ctx: %m");
34 .malloc = malloc, .free = free, .realloc = realloc,
36 .prefix = (struct in6_addr){{{ 0xff, 0x15, 'P', 'S',
38 0x00, 0x00, 0x00, 0x00,
39 0x00, 0x00, 0x00, 0x00 }}},
41 .pmtu = PSMB_DEFAULT_PMTU,
42 .port = PSMB_DEFAULT_PORT};
46 psmb_result_t psmb_set_logf(psmb_ctx_t *ctx,
47 void (*logf)(void *log_priv, int priority, const char *format, ...),
52 ctx->log_priv = log_priv;
53 return (psmb_result_t){PSMB_OK};
55 LOG(ctx, LOG_ERR, "psmb_set_...() used after psmb_open()");
57 return (psmb_result_t){PSMB_ERROR};
61 psmb_result_t psmb_set_pmtu(psmb_ctx_t *ctx, unsigned int pmtu)
65 return (psmb_result_t){PSMB_OK};
67 LOG(ctx, LOG_ERR, "psmb_set_...() used after psmb_open()");
69 return (psmb_result_t){PSMB_ERROR};
73 psmb_result_t psmb_set_port(psmb_ctx_t *ctx, unsigned short port)
77 return (psmb_result_t){PSMB_OK};
79 LOG(ctx, LOG_ERR, "psmb_set_...() used after psmb_open()");
81 return (psmb_result_t){PSMB_ERROR};
85 psmb_result_t psmb_set_mgrp(psmb_ctx_t *ctx, struct in6_addr prefix,
86 unsigned char prefixlen)
88 if (prefixlen > 128) {
89 LOG(ctx, LOG_ERR, "psmb_set_mgrp() prefixlen %d is too big",
92 return (psmb_result_t){PSMB_ERROR};
96 ctx->prefixlen = prefixlen;
97 return (psmb_result_t){PSMB_OK};
99 LOG(ctx, LOG_ERR, "psmb_set_...() used after psmb_open()");
101 return (psmb_result_t){PSMB_ERROR};
105 psmb_result_t psmb_open(psmb_ctx_t *ctx)
107 unsigned long on = 1;
108 struct sockaddr_in6 addr = (struct sockaddr_in6){
109 .sin6_family = AF_INET6,
110 .sin6_addr = in6addr_any,
111 .sin6_port = htons(ctx->port)
115 LOG(ctx, LOG_ERR, "redundant call to psmb_open()");
117 return (psmb_result_t){PSMB_ERROR};
119 ctx->fd = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
122 LOG(ctx, LOG_ERR, "socket: %m");
124 return (psmb_result_t){PSMB_ERROR};
126 if (setsockopt(ctx->fd, SOL_SOCKET, SO_REUSEADDR,
127 &on, sizeof(on)) < 0) {
129 LOG(ctx, LOG_ERR, "setsockopt(..., SO_REUSEADDR, ...): %m");
133 return (psmb_result_t){PSMB_ERROR};
135 if (setsockopt(ctx->fd, IPPROTO_IPV6, IPV6_RECVPKTINFO,
136 &on, sizeof(on)) < 0) {
138 LOG(ctx, LOG_ERR, "setsockopt(..., IPV6_PKTINFO, ...): %m");
142 return (psmb_result_t){PSMB_ERROR};
144 if (bind(ctx->fd, (struct sockaddr *)&addr,
145 sizeof(struct sockaddr_in6)) == -1) {
147 LOG(ctx, LOG_ERR, "bind(): %m");
151 return (psmb_result_t){PSMB_ERROR};
153 /* TODO: set non-blocking */
154 return (psmb_result_t){PSMB_OK};
157 static struct in6_addr multiaddr(struct in6_addr prefix,
158 unsigned char prefixlen, uint64_t suffix)
160 struct in6_addr result = prefix;
161 unsigned char len = prefixlen > 64 ? prefixlen : 64;
162 uint64_t mask = len == 64 ? ~(uint64_t)0 : ((uint64_t)1 << len) - 1;
164 *(uint64_t *)(&result.__in6_u.__u6_addr32[2]) &= ~mask;
165 *(uint64_t *)(&result.__in6_u.__u6_addr32[2]) |= (suffix & mask);
169 static psmb_result_t psmb_sub_unsub(psmb_ctx_t *ctx, char *channel, int option)
171 struct ipv6_mreq mreq = { 0 };
172 char mgrp_str[INET6_ADDRSTRLEN+1];
175 LOG(ctx, LOG_ERR, "subscribe: psmb is not open");
177 return (psmb_result_t){PSMB_ERROR};
179 mreq.ipv6mr_multiaddr = multiaddr(ctx->prefix, ctx->prefixlen,
180 hash64(channel, strlen(channel)));
181 (void)inet_ntop(AF_INET6, &mreq.ipv6mr_multiaddr,
182 mgrp_str, sizeof(mgrp_str));
183 LOG(ctx, LOG_DEBUG, "using multiaddr %s for channel \"%s\"",
185 mreq.ipv6mr_interface = 0; /* how to use this??? */
186 if (setsockopt(ctx->fd, IPPROTO_IPV6, option,
187 (void *)&mreq, sizeof(mreq)) == -1) {
189 LOG(ctx, LOG_ERR, "add_membership(): %m");
191 return (psmb_result_t){PSMB_ERROR};
193 return (psmb_result_t){PSMB_OK};
196 psmb_result_t psmb_subscribe(psmb_ctx_t *ctx, char *channel)
198 return psmb_sub_unsub(ctx, channel, IPV6_ADD_MEMBERSHIP);
201 psmb_result_t psmb_unsubscribe(psmb_ctx_t *ctx, char *channel)
203 return psmb_sub_unsub(ctx, channel, IPV6_DROP_MEMBERSHIP);
206 psmb_result_t psmb_ev_rd(psmb_ctx_t *ctx)
209 char cmsgbuf[MAXBUFLEN];
212 iov[0].iov_len=sizeof(buf);
213 struct cmsghdr *cmsg;
214 struct msghdr message;
215 message.msg_name=&their_addr;
216 message.msg_namelen=sizeof(their_addr);
218 message.msg_iovlen=1;
219 message.msg_control=cmsgbuf;
220 message.msg_controllen=MAXBUFLEN;
222 if ((numbytes = recvmsg(sockfd, &message, 0)) == -1) {
225 for (cmsg = CMSG_FIRSTHDR(&message); cmsg != NULL; cmsg = CMSG_NXTHDR(&message, cmsg)) {
226 if (cmsg->cmsg_level != IPPROTO_IP || cmsg->cmsg_type != IP_PKTINFO)
228 struct in_pktinfo *pi = CMSG_DATA(cmsg);
229 addr = pi->ipi_spec_dst.s_addr;
233 return (psmb_result_t){PSMB_OK};
236 psmb_result_t psmb_ev_wr(psmb_ctx_t *ctx)
238 sock_opt_addr.s_addr = addr;
239 setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_IF, &sock_opt_addr, sizeof(sock_opt_addr));
240 sendto(sockfd, buffer, len, 0, (struct sockaddr *)&destination, sizeof destination);
242 return (psmb_result_t){PSMB_OK};
245 psmb_result_t psmb_ev_ex(psmb_ctx_t *ctx)
247 return (psmb_result_t){PSMB_OK};
250 psmb_result_t psmb_publish(psmb_ctx_t *ctx, char *channel,
251 void *data, size_t size)
253 return (psmb_result_t){PSMB_OK};
256 psmb_result_t psmb_get_message(psmb_ctx_t *ctx, char **channel,
257 void **data, size_t *size)
259 return (psmb_result_t){PSMB_OK};
262 bool psmb_success(psmb_result_t result)
264 return !(result.code & PSMB_ERROR);
267 bool psmb_message_waiting(psmb_result_t result)
269 return !!(result.code & PSMB_MESSAGE);
272 bool psmb_need_write_wait(psmb_result_t result)
274 return !!(result.code & PSMB_NEED_WRITE);
277 void psmb_destroy(psmb_ctx_t *ctx)
280 LOG(ctx, LOG_ERR, "psmb_ctx is not open");
282 if (close(ctx->fd) == -1)
283 LOG(ctx, LOG_ERR, "close(): %m");
285 /* clean up the rest */