diff options
author | Craig Tiller <ctiller@google.com> | 2017-03-20 09:36:17 -0700 |
---|---|---|
committer | Craig Tiller <ctiller@google.com> | 2017-03-20 09:36:17 -0700 |
commit | 444c223c177a053e1462a8781895906f5381fa07 (patch) | |
tree | 977a27493c92b9c157b14c77cf0b4acab35c252f /src/core/lib/iomgr/tcp_server_posix.c | |
parent | 83190a1e1b463bb263ebce38ab23cc147dd341c9 (diff) | |
parent | 40a947ef93aeddca3b606613f628d4d09f094e77 (diff) |
Merge github.com:grpc/grpc into new_transport_op
Diffstat (limited to 'src/core/lib/iomgr/tcp_server_posix.c')
-rw-r--r-- | src/core/lib/iomgr/tcp_server_posix.c | 400 |
1 files changed, 12 insertions, 388 deletions
diff --git a/src/core/lib/iomgr/tcp_server_posix.c b/src/core/lib/iomgr/tcp_server_posix.c index 5f286a6723..b3644518f5 100644 --- a/src/core/lib/iomgr/tcp_server_posix.c +++ b/src/core/lib/iomgr/tcp_server_posix.c @@ -44,11 +44,8 @@ #include <errno.h> #include <fcntl.h> -#include <ifaddrs.h> -#include <limits.h> #include <netinet/in.h> #include <netinet/tcp.h> -#include <stdio.h> #include <string.h> #include <sys/socket.h> #include <sys/stat.h> @@ -67,82 +64,10 @@ #include "src/core/lib/iomgr/sockaddr_utils.h" #include "src/core/lib/iomgr/socket_utils_posix.h" #include "src/core/lib/iomgr/tcp_posix.h" +#include "src/core/lib/iomgr/tcp_server_utils_posix.h" #include "src/core/lib/iomgr/unix_sockets_posix.h" #include "src/core/lib/support/string.h" -#define MIN_SAFE_ACCEPT_QUEUE_SIZE 100 - -static gpr_once s_init_max_accept_queue_size; -static int s_max_accept_queue_size; - -/* one listening port */ -typedef struct grpc_tcp_listener grpc_tcp_listener; -struct grpc_tcp_listener { - int fd; - grpc_fd *emfd; - grpc_tcp_server *server; - grpc_resolved_address addr; - int port; - unsigned port_index; - unsigned fd_index; - grpc_closure read_closure; - grpc_closure destroyed_closure; - struct grpc_tcp_listener *next; - /* sibling is a linked list of all listeners for a given port. add_port and - clone_port place all new listeners in the same sibling list. A member of - the 'sibling' list is also a member of the 'next' list. The head of each - sibling list has is_sibling==0, and subsequent members of sibling lists - have is_sibling==1. is_sibling allows separate sibling lists to be - identified while iterating through 'next'. */ - struct grpc_tcp_listener *sibling; - int is_sibling; -}; - -/* the overall server */ -struct grpc_tcp_server { - gpr_refcount refs; - /* Called whenever accept() succeeds on a server port. */ - grpc_tcp_server_cb on_accept_cb; - void *on_accept_cb_arg; - - gpr_mu mu; - - /* active port count: how many ports are actually still listening */ - size_t active_ports; - /* destroyed port count: how many ports are completely destroyed */ - size_t destroyed_ports; - - /* is this server shutting down? */ - bool shutdown; - /* have listeners been shutdown? */ - bool shutdown_listeners; - /* use SO_REUSEPORT */ - bool so_reuseport; - /* expand wildcard addresses to a list of all local addresses */ - bool expand_wildcard_addrs; - - /* linked list of server ports */ - grpc_tcp_listener *head; - grpc_tcp_listener *tail; - unsigned nports; - - /* List of closures passed to shutdown_starting_add(). */ - grpc_closure_list shutdown_starting; - - /* shutdown callback */ - grpc_closure *shutdown_complete; - - /* all pollsets interested in new connections */ - grpc_pollset **pollsets; - /* number of pollsets in the pollsets array */ - size_t pollset_count; - - /* next pollset to assign a channel to */ - gpr_atm next_pollset_to_assign; - - grpc_resource_quota *resource_quota; -}; - static gpr_once check_init = GPR_ONCE_INIT; static bool has_so_reuseport = false; @@ -301,99 +226,6 @@ static void tcp_server_destroy(grpc_exec_ctx *exec_ctx, grpc_tcp_server *s) { } } -/* get max listen queue size on linux */ -static void init_max_accept_queue_size(void) { - int n = SOMAXCONN; - char buf[64]; - FILE *fp = fopen("/proc/sys/net/core/somaxconn", "r"); - if (fp == NULL) { - /* 2.4 kernel. */ - s_max_accept_queue_size = SOMAXCONN; - return; - } - if (fgets(buf, sizeof buf, fp)) { - char *end; - long i = strtol(buf, &end, 10); - if (i > 0 && i <= INT_MAX && end && *end == 0) { - n = (int)i; - } - } - fclose(fp); - s_max_accept_queue_size = n; - - if (s_max_accept_queue_size < MIN_SAFE_ACCEPT_QUEUE_SIZE) { - gpr_log(GPR_INFO, - "Suspiciously small accept queue (%d) will probably lead to " - "connection drops", - s_max_accept_queue_size); - } -} - -static int get_max_accept_queue_size(void) { - gpr_once_init(&s_init_max_accept_queue_size, init_max_accept_queue_size); - return s_max_accept_queue_size; -} - -/* Prepare a recently-created socket for listening. */ -static grpc_error *prepare_socket(int fd, const grpc_resolved_address *addr, - bool so_reuseport, int *port) { - grpc_resolved_address sockname_temp; - grpc_error *err = GRPC_ERROR_NONE; - - GPR_ASSERT(fd >= 0); - - if (so_reuseport && !grpc_is_unix_socket(addr)) { - err = grpc_set_socket_reuse_port(fd, 1); - if (err != GRPC_ERROR_NONE) goto error; - } - - err = grpc_set_socket_nonblocking(fd, 1); - if (err != GRPC_ERROR_NONE) goto error; - err = grpc_set_socket_cloexec(fd, 1); - if (err != GRPC_ERROR_NONE) goto error; - if (!grpc_is_unix_socket(addr)) { - err = grpc_set_socket_low_latency(fd, 1); - if (err != GRPC_ERROR_NONE) goto error; - err = grpc_set_socket_reuse_addr(fd, 1); - if (err != GRPC_ERROR_NONE) goto error; - } - err = grpc_set_socket_no_sigpipe_if_possible(fd); - if (err != GRPC_ERROR_NONE) goto error; - - GPR_ASSERT(addr->len < ~(socklen_t)0); - if (bind(fd, (struct sockaddr *)addr->addr, (socklen_t)addr->len) < 0) { - err = GRPC_OS_ERROR(errno, "bind"); - goto error; - } - - if (listen(fd, get_max_accept_queue_size()) < 0) { - err = GRPC_OS_ERROR(errno, "listen"); - goto error; - } - - sockname_temp.len = sizeof(struct sockaddr_storage); - - if (getsockname(fd, (struct sockaddr *)sockname_temp.addr, - (socklen_t *)&sockname_temp.len) < 0) { - err = GRPC_OS_ERROR(errno, "getsockname"); - goto error; - } - - *port = grpc_sockaddr_get_port(&sockname_temp); - return GRPC_ERROR_NONE; - -error: - GPR_ASSERT(err != GRPC_ERROR_NONE); - if (fd >= 0) { - close(fd); - } - grpc_error *ret = grpc_error_set_int( - GRPC_ERROR_CREATE_REFERENCING("Unable to configure socket", &err, 1), - GRPC_ERROR_INT_FD, fd); - GRPC_ERROR_UNREF(err); - return ret; -} - /* event manager callback when reads are ready */ static void on_read(grpc_exec_ctx *exec_ctx, void *arg, grpc_error *err) { grpc_tcp_listener *sp = arg; @@ -477,216 +309,6 @@ error: } } -static grpc_error *add_socket_to_server(grpc_tcp_server *s, int fd, - const grpc_resolved_address *addr, - unsigned port_index, unsigned fd_index, - grpc_tcp_listener **listener) { - grpc_tcp_listener *sp = NULL; - int port = -1; - char *addr_str; - char *name; - - grpc_error *err = prepare_socket(fd, addr, s->so_reuseport, &port); - if (err == GRPC_ERROR_NONE) { - GPR_ASSERT(port > 0); - grpc_sockaddr_to_string(&addr_str, addr, 1); - gpr_asprintf(&name, "tcp-server-listener:%s", addr_str); - gpr_mu_lock(&s->mu); - s->nports++; - GPR_ASSERT(!s->on_accept_cb && "must add ports before starting server"); - sp = gpr_malloc(sizeof(grpc_tcp_listener)); - sp->next = NULL; - if (s->head == NULL) { - s->head = sp; - } else { - s->tail->next = sp; - } - s->tail = sp; - sp->server = s; - sp->fd = fd; - sp->emfd = grpc_fd_create(fd, name); - memcpy(&sp->addr, addr, sizeof(grpc_resolved_address)); - sp->port = port; - sp->port_index = port_index; - sp->fd_index = fd_index; - sp->is_sibling = 0; - sp->sibling = NULL; - GPR_ASSERT(sp->emfd); - gpr_mu_unlock(&s->mu); - gpr_free(addr_str); - gpr_free(name); - } - - *listener = sp; - return err; -} - -/* If successful, add a listener to s for addr, set *dsmode for the socket, and - return the *listener. */ -static grpc_error *add_addr_to_server(grpc_tcp_server *s, - const grpc_resolved_address *addr, - unsigned port_index, unsigned fd_index, - grpc_dualstack_mode *dsmode, - grpc_tcp_listener **listener) { - grpc_resolved_address addr4_copy; - int fd; - grpc_error *err = - grpc_create_dualstack_socket(addr, SOCK_STREAM, 0, dsmode, &fd); - if (err != GRPC_ERROR_NONE) { - return err; - } - if (*dsmode == GRPC_DSMODE_IPV4 && - grpc_sockaddr_is_v4mapped(addr, &addr4_copy)) { - addr = &addr4_copy; - } - return add_socket_to_server(s, fd, addr, port_index, fd_index, listener); -} - -/* Bind to "::" to get a port number not used by any address. */ -static grpc_error *get_unused_port(int *port) { - grpc_resolved_address wild; - grpc_sockaddr_make_wildcard6(0, &wild); - grpc_dualstack_mode dsmode; - int fd; - grpc_error *err = - grpc_create_dualstack_socket(&wild, SOCK_STREAM, 0, &dsmode, &fd); - if (err != GRPC_ERROR_NONE) { - return err; - } - if (dsmode == GRPC_DSMODE_IPV4) { - grpc_sockaddr_make_wildcard4(0, &wild); - } - if (bind(fd, (const struct sockaddr *)wild.addr, (socklen_t)wild.len) != 0) { - err = GRPC_OS_ERROR(errno, "bind"); - close(fd); - return err; - } - if (getsockname(fd, (struct sockaddr *)wild.addr, (socklen_t *)&wild.len) != - 0) { - err = GRPC_OS_ERROR(errno, "getsockname"); - close(fd); - return err; - } - close(fd); - *port = grpc_sockaddr_get_port(&wild); - return *port <= 0 ? GRPC_ERROR_CREATE("Bad port") : GRPC_ERROR_NONE; -} - -/* Return the listener in s with address addr or NULL. */ -static grpc_tcp_listener *find_listener_with_addr(grpc_tcp_server *s, - grpc_resolved_address *addr) { - grpc_tcp_listener *l; - gpr_mu_lock(&s->mu); - for (l = s->head; l != NULL; l = l->next) { - if (l->addr.len != addr->len) { - continue; - } - if (memcmp(l->addr.addr, addr->addr, addr->len) == 0) { - break; - } - } - gpr_mu_unlock(&s->mu); - return l; -} - -/* Get all addresses assigned to network interfaces on the machine and create a - listener for each. requested_port is the port to use for every listener, or 0 - to select one random port that will be used for every listener. Set *out_port - to the port selected. Return GRPC_ERROR_NONE only if all listeners were - added. */ -static grpc_error *add_all_local_addrs_to_server(grpc_tcp_server *s, - unsigned port_index, - int requested_port, - int *out_port) { - struct ifaddrs *ifa = NULL; - struct ifaddrs *ifa_it; - unsigned fd_index = 0; - grpc_tcp_listener *sp = NULL; - grpc_error *err = GRPC_ERROR_NONE; - if (requested_port == 0) { - /* Note: There could be a race where some local addrs can listen on the - selected port and some can't. The sane way to handle this would be to - retry by recreating the whole grpc_tcp_server. Backing out individual - listeners and orphaning the FDs looks like too much trouble. */ - if ((err = get_unused_port(&requested_port)) != GRPC_ERROR_NONE) { - return err; - } else if (requested_port <= 0) { - return GRPC_ERROR_CREATE("Bad get_unused_port()"); - } - gpr_log(GPR_DEBUG, "Picked unused port %d", requested_port); - } - if (getifaddrs(&ifa) != 0 || ifa == NULL) { - return GRPC_OS_ERROR(errno, "getifaddrs"); - } - for (ifa_it = ifa; ifa_it != NULL; ifa_it = ifa_it->ifa_next) { - grpc_resolved_address addr; - char *addr_str = NULL; - grpc_dualstack_mode dsmode; - grpc_tcp_listener *new_sp = NULL; - const char *ifa_name = (ifa_it->ifa_name ? ifa_it->ifa_name : "<unknown>"); - if (ifa_it->ifa_addr == NULL) { - continue; - } else if (ifa_it->ifa_addr->sa_family == AF_INET) { - addr.len = sizeof(struct sockaddr_in); - } else if (ifa_it->ifa_addr->sa_family == AF_INET6) { - addr.len = sizeof(struct sockaddr_in6); - } else { - continue; - } - memcpy(addr.addr, ifa_it->ifa_addr, addr.len); - if (!grpc_sockaddr_set_port(&addr, requested_port)) { - /* Should never happen, because we check sa_family above. */ - err = GRPC_ERROR_CREATE("Failed to set port"); - break; - } - if (grpc_sockaddr_to_string(&addr_str, &addr, 0) < 0) { - addr_str = gpr_strdup("<error>"); - } - gpr_log(GPR_DEBUG, - "Adding local addr from interface %s flags 0x%x to server: %s", - ifa_name, ifa_it->ifa_flags, addr_str); - /* We could have multiple interfaces with the same address (e.g., bonding), - so look for duplicates. */ - if (find_listener_with_addr(s, &addr) != NULL) { - gpr_log(GPR_DEBUG, "Skipping duplicate addr %s on interface %s", addr_str, - ifa_name); - gpr_free(addr_str); - continue; - } - if ((err = add_addr_to_server(s, &addr, port_index, fd_index, &dsmode, - &new_sp)) != GRPC_ERROR_NONE) { - char *err_str = NULL; - grpc_error *root_err; - if (gpr_asprintf(&err_str, "Failed to add listener: %s", addr_str) < 0) { - err_str = gpr_strdup("Failed to add listener"); - } - root_err = GRPC_ERROR_CREATE(err_str); - gpr_free(err_str); - gpr_free(addr_str); - err = grpc_error_add_child(root_err, err); - break; - } else { - GPR_ASSERT(requested_port == new_sp->port); - ++fd_index; - if (sp != NULL) { - new_sp->is_sibling = 1; - sp->sibling = new_sp; - } - sp = new_sp; - } - gpr_free(addr_str); - } - freeifaddrs(ifa); - if (err != GRPC_ERROR_NONE) { - return err; - } else if (sp == NULL) { - return GRPC_ERROR_CREATE("No local addresses"); - } else { - *out_port = sp->port; - return GRPC_ERROR_NONE; - } -} - /* Treat :: or 0.0.0.0 as a family-agnostic wildcard. */ static grpc_error *add_wildcard_addrs_to_server(grpc_tcp_server *s, unsigned port_index, @@ -701,14 +323,16 @@ static grpc_error *add_wildcard_addrs_to_server(grpc_tcp_server *s, grpc_error *v6_err = GRPC_ERROR_NONE; grpc_error *v4_err = GRPC_ERROR_NONE; *out_port = -1; - if (s->expand_wildcard_addrs) { - return add_all_local_addrs_to_server(s, port_index, requested_port, - out_port); + + if (grpc_tcp_server_have_ifaddrs() && s->expand_wildcard_addrs) { + return grpc_tcp_server_add_all_local_addrs(s, port_index, requested_port, + out_port); } + grpc_sockaddr_make_wildcards(requested_port, &wild4, &wild6); /* Try listening on IPv6 first. */ - if ((v6_err = add_addr_to_server(s, &wild6, port_index, fd_index, &dsmode, - &sp)) == GRPC_ERROR_NONE) { + if ((v6_err = grpc_tcp_server_add_addr(s, &wild6, port_index, fd_index, + &dsmode, &sp)) == GRPC_ERROR_NONE) { ++fd_index; requested_port = *out_port = sp->port; if (dsmode == GRPC_DSMODE_DUALSTACK || dsmode == GRPC_DSMODE_IPV4) { @@ -717,8 +341,8 @@ static grpc_error *add_wildcard_addrs_to_server(grpc_tcp_server *s, } /* If we got a v6-only socket or nothing, try adding 0.0.0.0. */ grpc_sockaddr_set_port(&wild4, requested_port); - if ((v4_err = add_addr_to_server(s, &wild4, port_index, fd_index, &dsmode, - &sp2)) == GRPC_ERROR_NONE) { + if ((v4_err = grpc_tcp_server_add_addr(s, &wild4, port_index, fd_index, + &dsmode, &sp2)) == GRPC_ERROR_NONE) { *out_port = sp2->port; if (sp != NULL) { sp2->is_sibling = 1; @@ -756,7 +380,7 @@ static grpc_error *clone_port(grpc_tcp_listener *listener, unsigned count) { err = grpc_create_dualstack_socket(&listener->addr, SOCK_STREAM, 0, &dsmode, &fd); if (err != GRPC_ERROR_NONE) return err; - err = prepare_socket(fd, &listener->addr, true, &port); + err = grpc_tcp_server_prepare_socket(fd, &listener->addr, true, &port); if (err != GRPC_ERROR_NONE) return err; listener->server->nports++; grpc_sockaddr_to_string(&addr_str, &listener->addr, 1); @@ -828,7 +452,7 @@ grpc_error *grpc_tcp_server_add_port(grpc_tcp_server *s, if (grpc_sockaddr_to_v4mapped(addr, &addr6_v4mapped)) { addr = &addr6_v4mapped; } - if ((err = add_addr_to_server(s, addr, port_index, 0, &dsmode, &sp)) == + if ((err = grpc_tcp_server_add_addr(s, addr, port_index, 0, &dsmode, &sp)) == GRPC_ERROR_NONE) { *out_port = sp->port; } |