#include "url.h"
#include "libavcodec/internal.h"
#include "libavutil/avutil.h"
+#include "libavutil/avassert.h"
#include "libavutil/mem.h"
#include "libavutil/time.h"
if (ff_check_interrupt(cb))
return AVERROR_EXIT;
ret = poll(p, nfds, POLLING_TIME);
- if (ret != 0)
+ if (ret != 0) {
+ if (ret < 0)
+ ret = ff_neterrno();
+ if (ret == AVERROR(EINTR))
+ continue;
break;
+ }
} while (timeout <= 0 || runs-- > 0);
if (!ret)
return AVERROR(ETIMEDOUT);
- if (ret < 0)
- return ff_neterrno();
return ret;
}
if (ret < 0)
return ff_neterrno();
if (ff_socket_nonblock(ret, 1) < 0)
- av_log(NULL, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
+ av_log(h, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
return ret;
}
socklen_t optlen;
if (ff_socket_nonblock(fd, 1) < 0)
- av_log(NULL, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
+ av_log(h, AV_LOG_DEBUG, "ff_socket_nonblock failed\n");
while ((ret = connect(fd, addr, addrlen))) {
ret = ff_neterrno();
return ret;
}
+static void interleave_addrinfo(struct addrinfo *base)
+{
+ struct addrinfo **next = &base->ai_next;
+ while (*next) {
+ struct addrinfo *cur = *next;
+ // Iterate forward until we find an entry of a different family.
+ if (cur->ai_family == base->ai_family) {
+ next = &cur->ai_next;
+ continue;
+ }
+ if (cur == base->ai_next) {
+ // If the first one following base is of a different family, just
+ // move base forward one step and continue.
+ base = cur;
+ next = &base->ai_next;
+ continue;
+ }
+ // Unchain cur from the rest of the list from its current spot.
+ *next = cur->ai_next;
+ // Hook in cur directly after base.
+ cur->ai_next = base->ai_next;
+ base->ai_next = cur;
+ // Restart with a new base. We know that before moving the cur element,
+ // everything between the previous base and cur had the same family,
+ // different from cur->ai_family. Therefore, we can keep next pointing
+ // where it was, and continue from there with base at the one after
+ // cur.
+ base = cur->ai_next;
+ }
+}
+
+static void print_address_list(void *ctx, const struct addrinfo *addr,
+ const char *title)
+{
+ char hostbuf[100], portbuf[20];
+ av_log(ctx, AV_LOG_DEBUG, "%s:\n", title);
+ while (addr) {
+ getnameinfo(addr->ai_addr, addr->ai_addrlen,
+ hostbuf, sizeof(hostbuf), portbuf, sizeof(portbuf),
+ NI_NUMERICHOST | NI_NUMERICSERV);
+ av_log(ctx, AV_LOG_DEBUG, "Address %s port %s\n", hostbuf, portbuf);
+ addr = addr->ai_next;
+ }
+}
+
+struct ConnectionAttempt {
+ int fd;
+ int64_t deadline_us;
+ struct addrinfo *addr;
+};
+
+// Returns < 0 on error, 0 on successfully started connection attempt,
+// > 0 for a connection that succeeded already.
+static int start_connect_attempt(struct ConnectionAttempt *attempt,
+ struct addrinfo **ptr, int timeout_ms,
+ URLContext *h,
+ void (*customize_fd)(void *, int), void *customize_ctx)
+{
+ struct addrinfo *ai = *ptr;
+ int ret;
+
+ *ptr = ai->ai_next;
+
+ attempt->fd = ff_socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
+ if (attempt->fd < 0)
+ return ff_neterrno();
+ attempt->deadline_us = av_gettime_relative() + timeout_ms * 1000;
+ attempt->addr = ai;
+
+ ff_socket_nonblock(attempt->fd, 1);
+
+ if (customize_fd)
+ customize_fd(customize_ctx, attempt->fd);
+
+ while ((ret = connect(attempt->fd, ai->ai_addr, ai->ai_addrlen))) {
+ ret = ff_neterrno();
+ switch (ret) {
+ case AVERROR(EINTR):
+ if (ff_check_interrupt(&h->interrupt_callback)) {
+ closesocket(attempt->fd);
+ attempt->fd = -1;
+ return AVERROR_EXIT;
+ }
+ continue;
+ case AVERROR(EINPROGRESS):
+ case AVERROR(EAGAIN):
+ return 0;
+ default:
+ closesocket(attempt->fd);
+ attempt->fd = -1;
+ return ret;
+ }
+ }
+ return 1;
+}
+
+// Try a new connection to another address after 200 ms, as suggested in
+// RFC 8305 (or sooner if an earlier attempt fails).
+#define NEXT_ATTEMPT_DELAY_MS 200
+
+int ff_connect_parallel(struct addrinfo *addrs, int timeout_ms_per_address,
+ int parallel, URLContext *h, int *fd,
+ void (*customize_fd)(void *, int), void *customize_ctx)
+{
+ struct ConnectionAttempt attempts[3];
+ struct pollfd pfd[3];
+ int nb_attempts = 0, i, j;
+ int64_t next_attempt_us = av_gettime_relative(), next_deadline_us;
+ int last_err = AVERROR(EIO);
+ socklen_t optlen;
+ char errbuf[100], hostbuf[100], portbuf[20];
+
+ if (parallel > FF_ARRAY_ELEMS(attempts))
+ parallel = FF_ARRAY_ELEMS(attempts);
+
+ print_address_list(h, addrs, "Original list of addresses");
+ // This mutates the list, but the head of the list is still the same
+ // element, so the caller, who owns the list, doesn't need to get
+ // an updated pointer.
+ interleave_addrinfo(addrs);
+ print_address_list(h, addrs, "Interleaved list of addresses");
+
+ while (nb_attempts > 0 || addrs) {
+ // Start a new connection attempt, if possible.
+ if (nb_attempts < parallel && addrs) {
+ getnameinfo(addrs->ai_addr, addrs->ai_addrlen,
+ hostbuf, sizeof(hostbuf), portbuf, sizeof(portbuf),
+ NI_NUMERICHOST | NI_NUMERICSERV);
+ av_log(h, AV_LOG_VERBOSE, "Starting connection attempt to %s port %s\n",
+ hostbuf, portbuf);
+ last_err = start_connect_attempt(&attempts[nb_attempts], &addrs,
+ timeout_ms_per_address, h,
+ customize_fd, customize_ctx);
+ if (last_err < 0) {
+ av_strerror(last_err, errbuf, sizeof(errbuf));
+ av_log(h, AV_LOG_VERBOSE, "Connected attempt failed: %s\n",
+ errbuf);
+ continue;
+ }
+ if (last_err > 0) {
+ for (i = 0; i < nb_attempts; i++)
+ closesocket(attempts[i].fd);
+ *fd = attempts[nb_attempts].fd;
+ return 0;
+ }
+ pfd[nb_attempts].fd = attempts[nb_attempts].fd;
+ pfd[nb_attempts].events = POLLOUT;
+ next_attempt_us = av_gettime_relative() + NEXT_ATTEMPT_DELAY_MS * 1000;
+ nb_attempts++;
+ }
+
+ av_assert0(nb_attempts > 0);
+ // The connection attempts are sorted from oldest to newest, so the
+ // first one will have the earliest deadline.
+ next_deadline_us = attempts[0].deadline_us;
+ // If we can start another attempt in parallel, wait until that time.
+ if (nb_attempts < parallel && addrs)
+ next_deadline_us = FFMIN(next_deadline_us, next_attempt_us);
+ last_err = ff_poll_interrupt(pfd, nb_attempts,
+ (next_deadline_us - av_gettime_relative())/1000,
+ &h->interrupt_callback);
+ if (last_err < 0 && last_err != AVERROR(ETIMEDOUT))
+ break;
+
+ // Check the status from the poll output.
+ for (i = 0; i < nb_attempts; i++) {
+ last_err = 0;
+ if (pfd[i].revents) {
+ // Some sort of action for this socket, check its status (either
+ // a successful connection or an error).
+ optlen = sizeof(last_err);
+ if (getsockopt(attempts[i].fd, SOL_SOCKET, SO_ERROR, &last_err, &optlen))
+ last_err = ff_neterrno();
+ else if (last_err != 0)
+ last_err = AVERROR(last_err);
+ if (last_err == 0) {
+ // Everything is ok, we seem to have a successful
+ // connection. Close other sockets and return this one.
+ for (j = 0; j < nb_attempts; j++)
+ if (j != i)
+ closesocket(attempts[j].fd);
+ *fd = attempts[i].fd;
+ getnameinfo(attempts[i].addr->ai_addr, attempts[i].addr->ai_addrlen,
+ hostbuf, sizeof(hostbuf), portbuf, sizeof(portbuf),
+ NI_NUMERICHOST | NI_NUMERICSERV);
+ av_log(h, AV_LOG_VERBOSE, "Successfully connected to %s port %s\n",
+ hostbuf, portbuf);
+ return 0;
+ }
+ }
+ if (attempts[i].deadline_us < av_gettime_relative() && !last_err)
+ last_err = AVERROR(ETIMEDOUT);
+ if (!last_err)
+ continue;
+ // Error (or timeout) for this socket; close the socket and remove
+ // it from the attempts/pfd arrays, to let a new attempt start
+ // directly.
+ getnameinfo(attempts[i].addr->ai_addr, attempts[i].addr->ai_addrlen,
+ hostbuf, sizeof(hostbuf), portbuf, sizeof(portbuf),
+ NI_NUMERICHOST | NI_NUMERICSERV);
+ av_strerror(last_err, errbuf, sizeof(errbuf));
+ av_log(h, AV_LOG_VERBOSE, "Connection attempt to %s port %s "
+ "failed: %s\n", hostbuf, portbuf, errbuf);
+ closesocket(attempts[i].fd);
+ memmove(&attempts[i], &attempts[i + 1],
+ (nb_attempts - i - 1) * sizeof(*attempts));
+ memmove(&pfd[i], &pfd[i + 1],
+ (nb_attempts - i - 1) * sizeof(*pfd));
+ i--;
+ nb_attempts--;
+ }
+ }
+ for (i = 0; i < nb_attempts; i++)
+ closesocket(attempts[i].fd);
+ if (last_err >= 0)
+ last_err = AVERROR(ECONNREFUSED);
+ if (last_err != AVERROR_EXIT) {
+ av_strerror(last_err, errbuf, sizeof(errbuf));
+ av_log(h, AV_LOG_ERROR, "Connection to %s failed: %s\n",
+ h->filename, errbuf);
+ }
+ return last_err;
+}
+
static int match_host_pattern(const char *pattern, const char *hostname)
{
int len_p, len_h;
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