int netblockstrtoaddr(const char* str, int port, struct sockaddr_storage* addr,
socklen_t* addrlen, int* net)
{
char buf[64];
char* s;
*net = (str_is_ip6(str)?128:32);
if((s=strchr(str, '/'))) {
if(atoi(s+1) > *net) {
log_err("netblock too large: %s", str);
return 0;
}
*net = atoi(s+1);
if(*net == 0 && strcmp(s+1, "0") != 0) {
log_err("cannot parse netblock: '%s'", str);
return 0;
}
strlcpy(buf, str, sizeof(buf));
s = strchr(buf, '/');
if(s) *s = 0;
s = buf;
}
if(!ipstrtoaddr(s?s:str, port, addr, addrlen)) {
log_err("cannot parse ip address: '%s'", str);
return 0;
}
if(s) {
addr_mask(addr, *addrlen, *net);
}
return 1;
}
int netblockstrtoaddr(const char* str, int port, struct sockaddr_storage* addr,
socklen_t* addrlen, int* net)
{
char* s = NULL;
*net = (str_is_ip6(str)?128:32);
if((s=strchr(str, '/'))) {
if(atoi(s+1) > *net) {
log_err("netblock too large: %s", str);
return 0;
}
*net = atoi(s+1);
if(*net == 0 && strcmp(s+1, "0") != 0) {
log_err("cannot parse netblock: '%s'", str);
return 0;
}
if(!(s = strdup(str))) {
log_err("out of memory");
return 0;
}
*strchr(s, '/') = '\0';
}
if(!ipstrtoaddr(s?s:str, port, addr, addrlen)) {
free(s);
log_err("cannot parse ip address: '%s'", str);
return 0;
}
if(s) {
free(s);
addr_mask(addr, *addrlen, *net);
}
return 1;
}
int
ipstrtoaddr(const char* ip, int port, struct sockaddr_storage* addr,
socklen_t* addrlen)
{
uint16_t p;
if(!ip) return 0;
p = (uint16_t) port;
if(str_is_ip6(ip)) {
char buf[MAX_ADDR_STRLEN];
char* s;
struct sockaddr_in6* sa = (struct sockaddr_in6*)addr;
*addrlen = (socklen_t)sizeof(struct sockaddr_in6);
memset(sa, 0, *addrlen);
sa->sin6_family = AF_INET6;
sa->sin6_port = (in_port_t)htons(p);
if((s=strchr(ip, '%'))) { /* ip6%interface, rfc 4007 */
if(s-ip >= MAX_ADDR_STRLEN)
return 0;
(void)strlcpy(buf, ip, sizeof(buf));
buf[s-ip]=0;
sa->sin6_scope_id = (uint32_t)atoi(s+1);
ip = buf;
}
if(inet_pton((int)sa->sin6_family, ip, &sa->sin6_addr) <= 0) {
return 0;
}
} else { /* ip4 */
struct sockaddr_in* sa = (struct sockaddr_in*)addr;
*addrlen = (socklen_t)sizeof(struct sockaddr_in);
memset(sa, 0, *addrlen);
sa->sin_family = AF_INET;
sa->sin_port = (in_port_t)htons(p);
if(inet_pton((int)sa->sin_family, ip, &sa->sin_addr) <= 0) {
return 0;
}
}
return 1;
}
int
ub_ctx_hosts(struct ub_ctx* ctx, char* fname)
{
FILE* in;
char buf[1024], ldata[1024];
char* parse, *addr, *name, *ins;
lock_basic_lock(&ctx->cfglock);
if(ctx->finalized) {
lock_basic_unlock(&ctx->cfglock);
errno=EINVAL;
return UB_AFTERFINAL;
}
lock_basic_unlock(&ctx->cfglock);
if(fname == NULL) {
#if defined(UB_ON_WINDOWS) && defined(HAVE_WINDOWS_H)
/*
* If this is Windows NT/XP/2K it's in
* %WINDIR%\system32\drivers\etc\hosts.
* If this is Windows 95/98/Me it's in %WINDIR%\hosts.
*/
name = getenv("WINDIR");
if (name != NULL) {
int retval=0;
snprintf(buf, sizeof(buf), "%s%s", name,
"\\system32\\drivers\\etc\\hosts");
if((retval=ub_ctx_hosts(ctx, buf)) !=0 ) {
snprintf(buf, sizeof(buf), "%s%s", name,
"\\hosts");
retval=ub_ctx_hosts(ctx, buf);
}
free(name);
return retval;
}
return UB_READFILE;
#else
fname = "/etc/hosts";
#endif /* WIN32 */
}
in = fopen(fname, "r");
if(!in) {
/* error in errno! perror(fname) */
return UB_READFILE;
}
while(fgets(buf, (int)sizeof(buf), in)) {
buf[sizeof(buf)-1] = 0;
parse=buf;
while(*parse == ' ' || *parse == '\t')
parse++;
if(*parse == '#')
continue; /* skip comment */
/* format: <addr> spaces <name> spaces <name> ... */
addr = parse;
/* skip addr */
while(isxdigit(*parse) || *parse == '.' || *parse == ':')
parse++;
if(*parse == '\n' || *parse == 0)
continue;
if(*parse == '%')
continue; /* ignore macOSX fe80::1%lo0 localhost */
if(*parse != ' ' && *parse != '\t') {
/* must have whitespace after address */
fclose(in);
errno=EINVAL;
return UB_SYNTAX;
}
*parse++ = 0; /* end delimiter for addr ... */
/* go to names and add them */
while(*parse) {
while(*parse == ' ' || *parse == '\t' || *parse=='\n')
parse++;
if(*parse == 0 || *parse == '#')
break;
/* skip name, allows (too) many printable characters */
name = parse;
while('!' <= *parse && *parse <= '~')
parse++;
if(*parse)
*parse++ = 0; /* end delimiter for name */
snprintf(ldata, sizeof(ldata), "%s %s %s",
name, str_is_ip6(addr)?"AAAA":"A", addr);
ins = strdup(ldata);
if(!ins) {
/* out of memory */
fclose(in);
errno=ENOMEM;
return UB_NOMEM;
}
lock_basic_lock(&ctx->cfglock);
if(!cfg_strlist_insert(&ctx->env->cfg->local_data,
ins)) {
lock_basic_unlock(&ctx->cfglock);
fclose(in);
free(ins);
errno=ENOMEM;
return UB_NOMEM;
}
lock_basic_unlock(&ctx->cfglock);
}
}
fclose(in);
return UB_NOERROR;
}
struct listen_port*
listening_ports_open(struct config_file* cfg)
{
struct listen_port* list = NULL;
struct addrinfo hints;
int i, do_ip4, do_ip6;
int do_tcp, do_auto;
char portbuf[32];
snprintf(portbuf, sizeof(portbuf), "%d", cfg->port);
do_ip4 = cfg->do_ip4;
do_ip6 = cfg->do_ip6;
do_tcp = cfg->do_tcp;
do_auto = cfg->if_automatic && cfg->do_udp;
if(cfg->incoming_num_tcp == 0)
do_tcp = 0;
/* getaddrinfo */
memset(&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
/* no name lookups on our listening ports */
if(cfg->num_ifs > 0)
hints.ai_flags |= AI_NUMERICHOST;
hints.ai_family = AF_UNSPEC;
#ifndef INET6
do_ip6 = 0;
#endif
if(!do_ip4 && !do_ip6) {
return NULL;
}
/* create ip4 and ip6 ports so that return addresses are nice. */
if(do_auto || cfg->num_ifs == 0) {
if(do_ip6) {
hints.ai_family = AF_INET6;
if(!ports_create_if(do_auto?"::0":"::1",
do_auto, cfg->do_udp, do_tcp,
&hints, portbuf, &list,
cfg->so_rcvbuf, cfg->so_sndbuf,
cfg->ssl_port)) {
listening_ports_free(list);
return NULL;
}
}
if(do_ip4) {
hints.ai_family = AF_INET;
if(!ports_create_if(do_auto?"0.0.0.0":"127.0.0.1",
do_auto, cfg->do_udp, do_tcp,
&hints, portbuf, &list,
cfg->so_rcvbuf, cfg->so_sndbuf,
cfg->ssl_port)) {
listening_ports_free(list);
return NULL;
}
}
} else for(i = 0; i<cfg->num_ifs; i++) {
if(str_is_ip6(cfg->ifs[i])) {
if(!do_ip6)
continue;
hints.ai_family = AF_INET6;
if(!ports_create_if(cfg->ifs[i], 0, cfg->do_udp,
do_tcp, &hints, portbuf, &list,
cfg->so_rcvbuf, cfg->so_sndbuf,
cfg->ssl_port)) {
listening_ports_free(list);
return NULL;
}
} else {
if(!do_ip4)
continue;
hints.ai_family = AF_INET;
if(!ports_create_if(cfg->ifs[i], 0, cfg->do_udp,
do_tcp, &hints, portbuf, &list,
cfg->so_rcvbuf, cfg->so_sndbuf,
cfg->ssl_port)) {
listening_ports_free(list);
return NULL;
}
}
}
return list;
}
/** delayer main service routine */
static void
service(const char* bind_str, int bindport, const char* serv_str,
size_t memsize, int delay_msec)
{
struct sockaddr_storage bind_addr, srv_addr;
socklen_t bind_len, srv_len;
struct ringbuf* ring = ring_create(memsize);
struct timeval delay, reuse;
sldns_buffer* pkt;
int i, s, listen_s;
#ifndef S_SPLINT_S
delay.tv_sec = delay_msec / 1000;
delay.tv_usec = (delay_msec % 1000)*1000;
#endif
reuse = delay; /* reuse is max(4*delay, 1 second) */
dl_tv_add(&reuse, &delay);
dl_tv_add(&reuse, &delay);
dl_tv_add(&reuse, &delay);
if(reuse.tv_sec == 0)
reuse.tv_sec = 1;
if(!extstrtoaddr(serv_str, &srv_addr, &srv_len)) {
printf("cannot parse forward address: %s\n", serv_str);
exit(1);
}
pkt = sldns_buffer_new(65535);
if(!pkt)
fatal_exit("out of memory");
if( signal(SIGINT, delayer_sigh) == SIG_ERR ||
#ifdef SIGHUP
signal(SIGHUP, delayer_sigh) == SIG_ERR ||
#endif
#ifdef SIGQUIT
signal(SIGQUIT, delayer_sigh) == SIG_ERR ||
#endif
#ifdef SIGBREAK
signal(SIGBREAK, delayer_sigh) == SIG_ERR ||
#endif
#ifdef SIGALRM
signal(SIGALRM, delayer_sigh) == SIG_ERR ||
#endif
signal(SIGTERM, delayer_sigh) == SIG_ERR)
fatal_exit("could not bind to signal");
/* bind UDP port */
if((s = socket(str_is_ip6(bind_str)?AF_INET6:AF_INET,
SOCK_DGRAM, 0)) == -1) {
#ifndef USE_WINSOCK
fatal_exit("socket: %s", strerror(errno));
#else
fatal_exit("socket: %s", wsa_strerror(WSAGetLastError()));
#endif
}
i=0;
if(bindport == 0) {
bindport = 1024 + random()%64000;
i = 100;
}
while(1) {
if(!ipstrtoaddr(bind_str, bindport, &bind_addr, &bind_len)) {
printf("cannot parse listen address: %s\n", bind_str);
exit(1);
}
if(bind(s, (struct sockaddr*)&bind_addr, bind_len) == -1) {
#ifndef USE_WINSOCK
log_err("bind: %s", strerror(errno));
#else
log_err("bind: %s", wsa_strerror(WSAGetLastError()));
#endif
if(i--==0)
fatal_exit("cannot bind any port");
bindport = 1024 + random()%64000;
} else break;
}
fd_set_nonblock(s);
/* and TCP port */
if((listen_s = socket(str_is_ip6(bind_str)?AF_INET6:AF_INET,
SOCK_STREAM, 0)) == -1) {
#ifndef USE_WINSOCK
fatal_exit("tcp socket: %s", strerror(errno));
#else
fatal_exit("tcp socket: %s", wsa_strerror(WSAGetLastError()));
#endif
}
#ifdef SO_REUSEADDR
if(1) {
int on = 1;
if(setsockopt(listen_s, SOL_SOCKET, SO_REUSEADDR, (void*)&on,
(socklen_t)sizeof(on)) < 0)
#ifndef USE_WINSOCK
fatal_exit("setsockopt(.. SO_REUSEADDR ..) failed: %s",
strerror(errno));
#else
fatal_exit("setsockopt(.. SO_REUSEADDR ..) failed: %s",
wsa_strerror(WSAGetLastError()));
#endif
}
#endif
if(bind(listen_s, (struct sockaddr*)&bind_addr, bind_len) == -1) {
#ifndef USE_WINSOCK
fatal_exit("tcp bind: %s", strerror(errno));
#else
fatal_exit("tcp bind: %s", wsa_strerror(WSAGetLastError()));
#endif
}
if(listen(listen_s, 5) == -1) {
#ifndef USE_WINSOCK
fatal_exit("tcp listen: %s", strerror(errno));
#else
fatal_exit("tcp listen: %s", wsa_strerror(WSAGetLastError()));
#endif
}
fd_set_nonblock(listen_s);
printf("listening on port: %d\n", bindport);
/* process loop */
do_quit = 0;
service_loop(s, listen_s, ring, &delay, &reuse, &srv_addr, srv_len,
pkt);
/* cleanup */
verbose(1, "cleanup");
#ifndef USE_WINSOCK
close(s);
close(listen_s);
#else
closesocket(s);
closesocket(listen_s);
#endif
sldns_buffer_free(pkt);
ring_delete(ring);
}