netdata/src/web_server.c at master · rk4github/netdata · GitHub

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#include "common.h"

int listen_backlog = LISTEN_BACKLOG;

size_t listen_fds_count = 0;

int listen_fds[MAX_LISTEN_FDS] = { [0 ... 99] = -1 };

char *listen_fds_names[MAX_LISTEN_FDS] = { [0 ... 99] = NULL };

int listen_port = LISTEN_PORT;

int web_server_mode = WEB_SERVER_MODE_MULTI_THREADED;

static int shown_server_socket_error = 0;

#ifdef NETDATA_INTERNAL_CHECKS

static void log_allocations(void)

{

#ifdef HAVE_C_MALLINFO

static int heap = 0, used = 0, mmap = 0;

struct mallinfo mi;

mi = mallinfo();

if(mi.uordblks > used) {

int clients = 0;

struct web_client *w;

for(w = web_clients; w ; w = w->next) clients++;

info("Allocated memory: used %d KB (+%d B), mmap %d KB (+%d B), heap %d KB (+%d B). %d web clients connected.",

mi.uordblks / 1024,

mi.uordblks - used,

mi.hblkhd / 1024,

mi.hblkhd - mmap,

mi.arena / 1024,

mi.arena - heap,

clients);

used = mi.uordblks;

heap = mi.arena;

mmap = mi.hblkhd;

}

#else /* ! HAVE_C_MALLINFO */

;

#endif /* ! HAVE_C_MALLINFO */

#ifdef has_jemalloc

malloc_stats_print(NULL, NULL, NULL);

#endif

}

#endif /* NETDATA_INTERNAL_CHECKS */

#ifndef HAVE_ACCEPT4

int accept4(int sock, struct sockaddr *addr, socklen_t *addrlen, int flags) {

int fd = accept(sock, addr, addrlen);

int newflags = 0;

if (fd < 0) return fd;

if (flags & SOCK_NONBLOCK) {

newflags |= O_NONBLOCK;

flags &= ~SOCK_NONBLOCK;

}

#ifdef SOCK_CLOEXEC

#ifdef O_CLOEXEC

if (flags & SOCK_CLOEXEC) {

newflags |= O_CLOEXEC;

flags &= ~SOCK_CLOEXEC;

}

#endif

if (flags) {

errno = -EINVAL;

return -1;

}

if (fcntl(fd, F_SETFL, newflags) < 0) {

int saved_errno = errno;

close(fd);

errno = saved_errno;

return -1;

}

return fd;

}

#endif

int create_listen_socket4(const char *ip, int port, int listen_backlog) {

int sock;

int sockopt = 1;

debug(D_LISTENER, "IPv4 creating new listening socket on ip '%s' port %d", ip, port);

sock = socket(AF_INET, SOCK_STREAM, 0);

if(sock < 0) {

error("IPv4 socket() on ip '%s' port %d failed.", ip, port);

shown_server_socket_error = 1;

return -1;

}

/* avoid "address already in use" */

if(setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*)&sockopt, sizeof(sockopt)) != 0)

error("Cannot set SO_REUSEADDR on ip '%s' port's %d.", ip, port);

struct sockaddr_in name;

memset(&name, 0, sizeof(struct sockaddr_in));

name.sin_family = AF_INET;

name.sin_port = htons (port);

int ret = inet_pton(AF_INET, ip, (void *)&name.sin_addr.s_addr);

if(ret != 1) {

error("Failed to convert IP '%s' to a valid IPv4 address.", ip);

shown_server_socket_error = 1;

close(sock);

return -1;

}

if(bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {

close(sock);

error("IPv4 bind() on ip '%s' port %d failed.", ip, port);

shown_server_socket_error = 1;

return -1;

}

if(listen(sock, listen_backlog) < 0) {

close(sock);

error("IPv4 listen() on ip '%s' port %d failed.", ip, port);

shown_server_socket_error = 1;

return -1;

}

debug(D_LISTENER, "Listening on IPv4 ip '%s' port %d", ip, port);

return sock;

}

int create_listen_socket6(const char *ip, int port, int listen_backlog) {

int sock = -1;

int sockopt = 1;

int ipv6only = 1;

debug(D_LISTENER, "IPv6 creating new listening socket on ip '%s' port %d", ip, port);

sock = socket(AF_INET6, SOCK_STREAM, 0);

if (sock < 0) {

error("IPv6 socket() on ip '%s' port %d failed.", ip, port);

shown_server_socket_error = 1;

return -1;

}

/* avoid "address already in use" */

if(setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void*)&sockopt, sizeof(sockopt)) != 0)

error("Cannot set SO_REUSEADDR on ip '%s' port's %d.", ip, port);

/* IPv6 only */

if(setsockopt(sock, IPPROTO_IPV6, IPV6_V6ONLY, (void*)&ipv6only, sizeof(ipv6only)) != 0)

error("Cannot set IPV6_V6ONLY on ip '%s' port's %d.", ip, port);

struct sockaddr_in6 name;

memset(&name, 0, sizeof(struct sockaddr_in6));

name.sin6_family = AF_INET6;

name.sin6_port = htons ((uint16_t) port);

int ret = inet_pton(AF_INET6, ip, (void *)&name.sin6_addr.s6_addr);

if(ret != 1) {

error("Failed to convert IP '%s' to a valid IPv6 address.", ip);

shown_server_socket_error = 1;

close(sock);

return -1;

}

name.sin6_scope_id = 0;

if (bind (sock, (struct sockaddr *) &name, sizeof (name)) < 0) {

close(sock);

error("IPv6 bind() on ip '%s' port %d failed.", ip, port);

shown_server_socket_error = 1;

return -1;

}

if (listen(sock, listen_backlog) < 0) {

close(sock);

error("IPv6 listen() on ip '%s' port %d failed.", ip, port);

shown_server_socket_error = 1;

return -1;

}

debug(D_LISTENER, "Listening on IPv6 ip '%s' port %d", ip, port);

return sock;

}

static inline int add_listen_socket(int fd, const char *ip, int port) {

if(listen_fds_count >= MAX_LISTEN_FDS) {

error("Too many listening sockets. Failed to add listening socket at ip '%s' port %d", ip, port);

shown_server_socket_error = 1;

close(fd);

return -1;

}

listen_fds[listen_fds_count] = fd;

char buffer[100 + 1];

snprintfz(buffer, 100, "[%s]:%d", ip, port);

listen_fds_names[listen_fds_count] = strdupz(buffer);

listen_fds_count++;

return 0;

}

int is_listen_socket(int fd) {

size_t i;

for(i = 0; i < listen_fds_count ;i++)

if(listen_fds[i] == fd) return 1;

return 0;

}

static inline void close_listen_sockets(void) {

size_t i;

for(i = 0; i < listen_fds_count ;i++) {

close(listen_fds[i]);

listen_fds[i] = -1;

freez(listen_fds_names[i]);

listen_fds_names[i] = NULL;

}

listen_fds_count = 0;

}

static inline int bind_to_one(const char *definition, int default_port, int listen_backlog) {

int added = 0;

struct addrinfo hints;

struct addrinfo *result = NULL, *rp = NULL;

char buffer[strlen(definition) + 1];

strcpy(buffer, definition);

char buffer2[10 + 1];

snprintfz(buffer2, 10, "%d", default_port);

char *ip = buffer, *port = buffer2;

char *e = ip;

if(*e == '[') {

e = ++ip;

while(*e && *e != ']') e++;

if(*e == ']') {

*e = '\0';

e++;

}

else {

while(*e && *e != ':') e++;

}

if(*e == ':') {

port = e + 1;

*e = '\0';

}

if(!*ip || *ip == '*' || !strcmp(ip, "any") || !strcmp(ip, "all"))

ip = NULL;

if(!*port)

port = buffer2;

memset(&hints, 0, sizeof(struct addrinfo));

hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */

hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */

hints.ai_flags = AI_PASSIVE; /* For wildcard IP address */

hints.ai_protocol = 0; /* Any protocol */

hints.ai_canonname = NULL;

hints.ai_addr = NULL;

hints.ai_next = NULL;

int r = getaddrinfo(ip, port, &hints, &result);

if (r != 0) {

error("getaddrinfo('%s', '%s'): %s\n", ip, port, gai_strerror(r));

return -1;

}

for (rp = result; rp != NULL; rp = rp->ai_next) {

int fd = -1;

char rip[INET_ADDRSTRLEN + INET6_ADDRSTRLEN] = "INVALID";

int rport = default_port;

switch (rp->ai_addr->sa_family) {

case AF_INET: {

struct sockaddr_in *sin = (struct sockaddr_in *) rp->ai_addr;

inet_ntop(AF_INET, &sin->sin_addr, rip, INET_ADDRSTRLEN);

rport = ntohs(sin->sin_port);

fd = create_listen_socket4(rip, rport, listen_backlog);

break;

}

case AF_INET6: {

struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) rp->ai_addr;

inet_ntop(AF_INET6, &sin6->sin6_addr, rip, INET6_ADDRSTRLEN);

rport = ntohs(sin6->sin6_port);

fd = create_listen_socket6(rip, rport, listen_backlog);

break;

}

if (fd == -1)

error("Cannot bind to ip '%s', port %d", rip, rport);

else {

add_listen_socket(fd, rip, rport);

added++;

}

freeaddrinfo(result);

return added;

}

int create_listen_sockets(void) {

shown_server_socket_error = 0;

listen_backlog = (int) config_get_number("global", "http port listen backlog", LISTEN_BACKLOG);

if(config_exists("global", "bind socket to IP") && !config_exists("global", "bind to"))

config_rename("global", "bind socket to IP", "bind to");

if(config_exists("global", "port") && !config_exists("global", "default port"))

config_rename("global", "port", "default port");

listen_port = (int) config_get_number("global", "default port", LISTEN_PORT);

if(listen_port < 1 || listen_port > 65535) {

error("Invalid listen port %d given. Defaulting to %d.", listen_port, LISTEN_PORT);

listen_port = (int) config_set_number("global", "default port", LISTEN_PORT);

}

debug(D_OPTIONS, "Default listen port set to %d.", listen_port);

char *s = config_get("global", "bind to", "*");

while(*s) {

char *e = s;

// skip separators, moving both s(tart) and e(nd)

while(isspace(*e) || *e == ',') s = ++e;

// move e(nd) to the first separator

while(*e && !isspace(*e) && *e != ',') e++;

// is there anything?

if(!*s || s == e) break;

char buf[e - s + 1];

strncpyz(buf, s, e - s);

bind_to_one(buf, listen_port, listen_backlog);

s = e;

}

if(!listen_fds_count)

fatal("Cannot listen on any socket. Exiting...");

else if(shown_server_socket_error) {

size_t i;

for(i = 0; i < listen_fds_count ;i++)

info("Listen socket %s opened.", listen_fds_names[i]);

}

return (int)listen_fds_count;

}

// --------------------------------------------------------------------------------------

// the main socket listener

static inline void cleanup_web_clients(void) {

struct web_client *w;

for (w = web_clients; w;) {

if (w->obsolete) {

debug(D_WEB_CLIENT, "%llu: Removing client.", w->id);

// pthread_cancel(w->thread);

// pthread_join(w->thread, NULL);

w = web_client_free(w);

#ifdef NETDATA_INTERNAL_CHECKS

log_allocations();

#endif

}

else w = w->next;

}

// 1. it accepts new incoming requests on our port

// 2. creates a new web_client for each connection received

// 3. spawns a new pthread to serve the client (this is optimal for keep-alive clients)

// 4. cleans up old web_clients that their pthreads have been exited

#define CLEANUP_EVERY_EVENTS 100

void *socket_listen_main_multi_threaded(void *ptr) {

(void)ptr;

web_server_mode = WEB_SERVER_MODE_MULTI_THREADED;

info("Multi-threaded WEB SERVER thread created with task id %d", gettid());

struct web_client *w;

int retval, counter = 0;

if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)

error("Cannot set pthread cancel type to DEFERRED.");

if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)

error("Cannot set pthread cancel state to ENABLE.");

if(!listen_fds_count)

fatal("LISTENER: No sockets to listen to.");

struct pollfd *fds = callocz(sizeof(struct pollfd), listen_fds_count);

size_t i;

for(i = 0; i < listen_fds_count ;i++) {

fds[i].fd = listen_fds[i];

fds[i].events = POLLIN;

fds[i].revents = 0;

info("Listening on '%s'", (listen_fds_names[i])?listen_fds_names[i]:"UNKNOWN");

}

int timeout = 10 * 1000;

for(;;) {

// debug(D_WEB_CLIENT, "LISTENER: Waiting...");

retval = poll(fds, listen_fds_count, timeout);

if(unlikely(retval == -1)) {

error("LISTENER: poll() failed.");

continue;

}

else if(unlikely(!retval)) {

debug(D_WEB_CLIENT, "LISTENER: select() timeout.");

counter = 0;

cleanup_web_clients();

continue;

}

for(i = 0 ; i < listen_fds_count ; i++) {

short int revents = fds[i].revents;

// check for new incoming connections

if(revents & POLLIN || revents & POLLPRI) {

fds[i].revents = 0;

w = web_client_create(fds[i].fd);

if(unlikely(!w)) {

// no need for error log - web_client_create already logged the error

continue;

}

if(pthread_create(&w->thread, NULL, web_client_main, w) != 0) {

error("%llu: failed to create new thread for web client.", w->id);

w->obsolete = 1;

}

else if(pthread_detach(w->thread) != 0) {

error("%llu: Cannot request detach of newly created web client thread.", w->id);

w->obsolete = 1;

}

// cleanup unused clients

counter++;

if(counter >= CLEANUP_EVERY_EVENTS) {

counter = 0;

cleanup_web_clients();

}

debug(D_WEB_CLIENT, "LISTENER: exit!");

close_listen_sockets();

return NULL;

}

struct web_client *single_threaded_clients[FD_SETSIZE];

static inline int single_threaded_link_client(struct web_client *w, fd_set *ifds, fd_set *ofds, fd_set *efds, int *max) {

if(unlikely(w->obsolete || w->dead || (!w->wait_receive && !w->wait_send)))

return 1;

if(unlikely(w->ifd < 0 || w->ifd >= FD_SETSIZE || w->ofd < 0 || w->ofd >= FD_SETSIZE)) {

error("%llu: invalid file descriptor, ifd = %d, ofd = %d (required 0 <= fd < FD_SETSIZE (%d)", w->id, w->ifd, w->ofd, FD_SETSIZE);

return 1;

}

FD_SET(w->ifd, efds);

if(unlikely(*max < w->ifd)) *max = w->ifd;

if(unlikely(w->ifd != w->ofd)) {

if(*max < w->ofd) *max = w->ofd;

FD_SET(w->ofd, efds);

}

if(w->wait_receive) FD_SET(w->ifd, ifds);

if(w->wait_send) FD_SET(w->ofd, ofds);

single_threaded_clients[w->ifd] = w;

single_threaded_clients[w->ofd] = w;

return 0;

}

static inline int single_threaded_unlink_client(struct web_client *w, fd_set *ifds, fd_set *ofds, fd_set *efds) {

FD_CLR(w->ifd, efds);

if(unlikely(w->ifd != w->ofd)) FD_CLR(w->ofd, efds);

if(w->wait_receive) FD_CLR(w->ifd, ifds);

if(w->wait_send) FD_CLR(w->ofd, ofds);

single_threaded_clients[w->ifd] = NULL;

single_threaded_clients[w->ofd] = NULL;

if(unlikely(w->obsolete || w->dead || (!w->wait_receive && !w->wait_send)))

return 1;

return 0;

}

void *socket_listen_main_single_threaded(void *ptr) {

(void)ptr;

web_server_mode = WEB_SERVER_MODE_SINGLE_THREADED;

info("Single-threaded WEB SERVER thread created with task id %d", gettid());

struct web_client *w;

int retval;

if(pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL) != 0)

error("Cannot set pthread cancel type to DEFERRED.");

if(pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) != 0)

error("Cannot set pthread cancel state to ENABLE.");

if(!listen_fds_count)

fatal("LISTENER: no listen sockets available.");

size_t i;

for(i = 0; i < FD_SETSIZE ; i++)

single_threaded_clients[i] = NULL;

fd_set ifds, ofds, efds, rifds, rofds, refds;

FD_ZERO (&ifds);

FD_ZERO (&ofds);

FD_ZERO (&efds);

int fdmax = 0;

for(i = 0; i < listen_fds_count ; i++) {

if (listen_fds[i] < 0 || listen_fds[i] >= FD_SETSIZE)

fatal("LISTENER: Listen socket %d is not ready, or invalid.", listen_fds[i]);

info("Listening on '%s'", (listen_fds_names[i])?listen_fds_names[i]:"UNKNOWN");

FD_SET(listen_fds[i], &ifds);

FD_SET(listen_fds[i], &efds);

if(fdmax < listen_fds[i])

fdmax = listen_fds[i];

}

for(;;) {

debug(D_WEB_CLIENT_ACCESS, "LISTENER: single threaded web server waiting (fdmax = %d)...", fdmax);

struct timeval tv = { .tv_sec = 1, .tv_usec = 0 };

rifds = ifds;

rofds = ofds;

refds = efds;

retval = select(fdmax+1, &rifds, &rofds, &refds, &tv);

if(unlikely(retval == -1)) {

error("LISTENER: select() failed.");

continue;

}

else if(likely(retval)) {

debug(D_WEB_CLIENT_ACCESS, "LISTENER: got something.");

for(i = 0; i < listen_fds_count ; i++) {

if (FD_ISSET(listen_fds[i], &rifds)) {

debug(D_WEB_CLIENT_ACCESS, "LISTENER: new connection.");

w = web_client_create(listen_fds[i]);

if (single_threaded_link_client(w, &ifds, &ofds, &ifds, &fdmax) != 0) {

web_client_free(w);

}

for(i = 0 ; i <= (size_t)fdmax ; i++) {

if(likely(!FD_ISSET(i, &rifds) && !FD_ISSET(i, &rofds) && !FD_ISSET(i, &refds)))

continue;

w = single_threaded_clients[i];

if(unlikely(!w))

continue;

if(unlikely(single_threaded_unlink_client(w, &ifds, &ofds, &efds) != 0)) {

web_client_free(w);

continue;

}

if (unlikely(FD_ISSET(w->ifd, &refds) || FD_ISSET(w->ofd, &refds))) {

web_client_free(w);

continue;

}

if (unlikely(w->wait_receive && FD_ISSET(w->ifd, &rifds))) {

if (unlikely(web_client_receive(w) < 0)) {

web_client_free(w);

continue;

}

if (w->mode != WEB_CLIENT_MODE_FILECOPY) {

debug(D_WEB_CLIENT, "%llu: Processing received data.", w->id);

web_client_process(w);

}

if (unlikely(w->wait_send && FD_ISSET(w->ofd, &rofds))) {

if (unlikely(web_client_send(w) < 0)) {

debug(D_WEB_CLIENT, "%llu: Cannot send data to client. Closing client.", w->id);

web_client_free(w);

continue;

}

if(unlikely(single_threaded_link_client(w, &ifds, &ofds, &efds, &fdmax) != 0)) {

web_client_free(w);

}

else {

debug(D_WEB_CLIENT_ACCESS, "LISTENER: single threaded web server timeout.");

#ifdef NETDATA_INTERNAL_CHECKS

log_allocations();

#endif

}

debug(D_WEB_CLIENT, "LISTENER: exit!");

close_listen_sockets();

return NULL;

}

netdata/src/web_server.c at master · rk4github/netdata · GitHub

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