int
accept_listener_arg(struct Listener *listener, char *arg) {
if (listener->address == NULL && !is_numeric(arg)) {
listener->address = new_address(arg);
if (listener->address == NULL ||
!address_is_sockaddr(listener->address)) {
fprintf(stderr, "Invalid listener argument %s\n", arg);
return -1;
}
} else if (listener->address == NULL && is_numeric(arg)) {
listener->address = new_address("[::]");
if (listener->address == NULL ||
!address_is_sockaddr(listener->address)) {
fprintf(stderr, "Unable to initialize default address\n");
return -1;
}
address_set_port(listener->address, atoi(arg));
} else if (address_port(listener->address) == 0 && is_numeric(arg)) {
address_set_port(listener->address, atoi(arg));
} else {
fprintf(stderr, "Invalid listener argument %s\n", arg);
}
return 1;
}
struct Address *
listener_lookup_server_address(const struct Listener *listener,
const char *name, size_t name_len) {
struct Address *new_addr = NULL;
short set_to_fallback = 0;
const struct Address *addr =
table_lookup_server_address(listener->table, name, name_len);
if (addr == NULL)
addr = listener->fallback_address;
if (addr == NULL)
return NULL;
int port = address_port(addr);
if (address_is_wildcard(addr)) {
new_addr = new_address(name);
if (new_addr == NULL) {
warn("Invalid hostname %.*s in client request",
(int)name_len, name);
set_to_fallback = 1;
} else if (address_is_sockaddr(new_addr)) {
warn("Refusing to proxy to socket address literal %.*s in request",
(int)name_len, name);
set_to_fallback = 1;
}
if (!set_to_fallback && port != 0)
address_set_port(new_addr, port);
} else {
size_t len = address_len(addr);
new_addr = malloc(len);
if (new_addr == NULL) {
err("%s: malloc", __func__);
set_to_fallback = 1;
}
memcpy(new_addr, addr, len);
}
if (set_to_fallback) {
size_t len = address_len(listener->fallback_address);
new_addr = malloc(len);
if (new_addr == NULL) {
err("%s: malloc", __func__);
return NULL;
}
memcpy(new_addr, listener->fallback_address, len);
}
if (!set_to_fallback && port == 0)
address_set_port(new_addr, address_port(listener->address));
return new_addr;
}
int
accept_backend_arg(struct Backend *backend, const char *arg) {
if (backend->pattern == NULL) {
backend->pattern = strdup(arg);
if (backend->pattern == NULL) {
err("strdup failed");
return -1;
}
} else if (backend->address == NULL) {
backend->address = new_address(arg);
if (backend->address == NULL) {
err("invalid address: %s", arg);
return -1;
}
#ifndef HAVE_LIBUDNS
if (!address_is_sockaddr(backend->address)) {
err("Only socket address backends are permitted when compiled without libudns");
return -1;
}
#endif
} else if (address_port(backend->address) == 0 && is_numeric(arg)) {
address_set_port(backend->address, atoi(arg));
} else {
err("Unexpected table backend argument: %s", arg);
return -1;
}
return 1;
}
int
accept_backend_arg(struct Backend *backend, char *arg) {
if (backend->name == NULL) {
backend->name = strdup(arg);
if (backend->name == NULL) {
err("strdup failed");
return -1;
}
} else if (backend->address == NULL) {
/* Store address in lower case */
for (char *c = arg; *c != '\0'; c++)
*c = tolower(*c);
backend->address = new_address(arg);
if (backend->address == NULL) {
err("invalid address: %s", arg);
return -1;
}
#ifndef HAVE_LIBUDNS
if (!address_is_sockaddr(backend->address)) {
err("Only socket address backends are permitted when compiled without libudns");
return -1;
}
#endif
} else if (address_port(backend->address) == 0 && is_numeric(arg)) {
address_set_port(backend->address, atoi(arg));
} else {
err("Unexpected table backend argument: %s", arg);
return -1;
}
return 1;
}
int
accept_backend_arg(struct Backend *backend, char *arg) {
if (backend->hostname == NULL) {
backend->hostname = strdup(arg);
if (backend->hostname == NULL) {
err("strdup failed");
return -1;
}
} else if (backend->address == NULL) {
/* Store address in lower case */
for (char *c = arg; *c == '\0'; c++)
*c = tolower(*c);
backend->address = new_address(arg);
if (backend->address == NULL) {
err("invalid address: %s\n", arg);
return -1;
}
} else if (address_port(backend->address) == 0 && is_numeric(arg)) {
address_set_port(backend->address, atoi(arg));
} else {
err("Unexpected table backend argument: %s\n", arg);
return -1;
}
return 1;
}
struct Address *
listener_lookup_server_address(const struct Listener *listener,
const char *name, size_t name_len) {
struct Address *new_addr = NULL;
const struct Address *addr =
table_lookup_server_address(listener->table, name, name_len);
if (addr == NULL)
addr = listener->fallback_address;
if (addr == NULL)
return NULL;
int port = address_port(addr);
if (address_is_wildcard(addr)) {
new_addr = new_address(name);
if (new_addr == NULL) {
warn("Invalid hostname %.*s", (int)name_len, name);
return listener->fallback_address;
}
if (port != 0)
address_set_port(new_addr, port);
} else {
size_t len = address_len(addr);
new_addr = malloc(len);
if (new_addr == NULL) {
err("%s: malloc", __func__);
return listener->fallback_address;
}
memcpy(new_addr, addr, len);
}
if (port == 0)
address_set_port(new_addr, address_port(listener->address));
return new_addr;
}
int
accept_listener_protocol(struct Listener *listener, char *protocol) {
if (strncasecmp(protocol, http_protocol->name, strlen(protocol)) == 0)
listener->protocol = http_protocol;
else
listener->protocol = tls_protocol;
if (address_port(listener->address) == 0)
address_set_port(listener->address, listener->protocol->default_port);
return 1;
}
int
init_listener(struct Listener *listener, const struct Table_head *tables) {
int sockfd;
int on = 1;
listener->table = table_lookup(tables, listener->table_name);
if (listener->table == NULL) {
fprintf(stderr, "Table \"%s\" not defined\n", listener->table_name);
return -1;
}
init_table(listener->table);
/* If no port was specified on the fallback address, inherit the address
* from the listening address */
if (listener->fallback_address &&
address_port(listener->fallback_address) == 0)
address_set_port(listener->fallback_address,
address_port(listener->address));
sockfd = socket(address_sa(listener->address)->sa_family, SOCK_STREAM, 0);
if (sockfd < 0) {
err("socket failed: %s", strerror(errno));
return -2;
}
/* set SO_REUSEADDR on server socket to facilitate restart */
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
if (bind(sockfd, address_sa(listener->address),
address_sa_len(listener->address)) < 0) {
err("bind failed: %s", strerror(errno));
close(sockfd);
return -3;
}
if (listen(sockfd, SOMAXCONN) < 0) {
err("listen failed: %s", strerror(errno));
close(sockfd);
return -4;
}
struct ev_io *listener_watcher = &listener->watcher;
ev_io_init(listener_watcher, accept_cb, sockfd, EV_READ);
listener->watcher.data = listener;
ev_io_start(EV_DEFAULT, listener_watcher);
return sockfd;
}
int main() {
/* using volatile variables so we can example core dumps */
for (volatile unsigned int i = 0; i < sizeof(good) / sizeof(struct Test); i++) {
int port;
char buffer[255];
struct Address *addr = new_address(good[i].input);
assert(addr != NULL);
assert(address_compare(addr, addr) == 0);
assert(address_compare(NULL, addr) < 0);
assert(address_compare(addr, NULL) > 0);
assert(address_len(addr) > 0);
if (good[i].expected_type & TYPE_HOSTNAME) {
assert(address_is_hostname(addr));
assert(!address_is_sockaddr(addr));
assert(!address_is_wildcard(addr));
assert(address_hostname(addr) != NULL);
assert(address_sa(addr) == NULL);
assert(address_sa_len(addr) == 0);
} else if (good[i].expected_type & TYPE_SOCKADDR) {
assert(!address_is_hostname(addr));
assert(address_is_sockaddr(addr));
assert(!address_is_wildcard(addr));
assert(address_hostname(addr) == NULL);
assert(address_sa(addr) != NULL);
assert(address_sa_len(addr) > 0);
} else if (good[i].expected_type & TYPE_WILDCARD) {
assert(!address_is_hostname(addr));
assert(!address_is_sockaddr(addr));
assert(address_is_wildcard(addr));
assert(address_hostname(addr) == NULL);
assert(address_sa(addr) == NULL);
assert(address_sa_len(addr) == 0);
}
display_address(addr, buffer, sizeof(buffer));
if (strcmp(buffer, good[i].output)) {
fprintf(stderr, "display_address(%p) returned \"%s\", expected \"%s\"\n", addr, buffer, good[i].output);
return 1;
}
assert(display_address(addr, NULL, 0) == NULL);
port = address_port(addr);
if (good[i].port != port) {
fprintf(stderr, "address_port(%p) return %d, expected %d\n", addr, port, good[i].port);
return 1;
}
address_set_port(addr, port);
if (good[i].port != port) {
fprintf(stderr, "address_port(%p) return %d, expected %d\n", addr, port, good[i].port);
return 1;
}
free(addr);
}
for (volatile unsigned int i = 0; i < sizeof(bad) / sizeof(const char *); i++) {
struct Address *addr = new_address(bad[i]);
if (addr != NULL) {
fprintf(stderr, "Accepted bad hostname \"%s\"\n", bad[i]);
return 1;
}
}
assert(compare_address_strings("unix:/dev/log", "127.0.0.1") < 0);
assert(compare_address_strings("unix:/dev/log", "unix:/dev/logsocket") < 0);
assert(compare_address_strings("0.0.0.0", "127.0.0.1") < 0);
assert(compare_address_strings("127.0.0.1", "0.0.0.0") > 0);
assert(compare_address_strings("127.0.0.1", "127.0.0.1") == 0);
assert(compare_address_strings("127.0.0.1:80", "127.0.0.1:81") < 0);
assert(compare_address_strings("*:80", "*:81") < 0);
assert(compare_address_strings("*:81", "*:80") > 0);
assert(compare_address_strings("example.com", "example.net") < 0);
assert(compare_address_strings("example.net", "example.com") > 0);
assert(compare_address_strings("example.com", "example.com.net") < 0);
assert(compare_address_strings("example.com.net", "example.com") > 0);
assert(compare_address_strings("example.com", "example.com:80") < 0);
assert(compare_address_strings("example.com:80", "example.com") > 0);
assert(compare_address_strings(NULL, "example.com") < 0);
assert(compare_address_strings("example.com", NULL) > 0);
assert(compare_address_strings("example.com", "::") < 0);
assert(compare_address_strings("::", "example.com") > 0);
assert(compare_address_strings("0.0.0.0", "*") < 0);
assert(compare_address_strings("*", "0.0.0.0") > 0);
do {
struct Address *addr = new_address("*");
assert(addr != NULL);
assert(address_len(addr) > 0);
free(addr);
} while (0);
return 0;
}
static int
init_listener(struct Listener *listener, const struct Table_head *tables, struct ev_loop *loop) {
struct Table *table = table_lookup(tables, listener->table_name);
if (table == NULL) {
err("Table \"%s\" not defined", listener->table_name);
return -1;
}
init_table(table);
listener->table = table_ref_get(table);
/* If no port was specified on the fallback address, inherit the address
* from the listening address */
if (listener->fallback_address &&
address_port(listener->fallback_address) == 0)
address_set_port(listener->fallback_address,
address_port(listener->address));
int sockfd = socket(address_sa(listener->address)->sa_family, SOCK_STREAM, 0);
if (sockfd < 0) {
err("socket failed: %s", strerror(errno));
return -2;
}
/* set SO_REUSEADDR on server socket to facilitate restart */
int on = 1;
setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
int result = bind(sockfd, address_sa(listener->address),
address_sa_len(listener->address));
if (result < 0 && errno == EACCES) {
/* Retry using binder module */
close(sockfd);
sockfd = bind_socket(address_sa(listener->address),
address_sa_len(listener->address));
if (sockfd < 0) {
char address[128];
err("binder failed to bind to %s",
display_address(listener->address, address, sizeof(address)));
close(sockfd);
return -3;
}
} else if (result < 0) {
char address[128];
err("bind %s failed: %s",
display_address(listener->address, address, sizeof(address)),
strerror(errno));
close(sockfd);
return -3;
}
if (listen(sockfd, SOMAXCONN) < 0) {
err("listen failed: %s", strerror(errno));
close(sockfd);
return -4;
}
int flags = fcntl(sockfd, F_GETFL, 0);
fcntl(sockfd, F_SETFL, flags | O_NONBLOCK);
listener_ref_get(listener);
ev_io_init(&listener->watcher, accept_cb, sockfd, EV_READ);
listener->watcher.data = listener;
listener->backoff_timer.data = listener;
ev_io_start(loop, &listener->watcher);
return sockfd;
}