diff options
Diffstat (limited to 'erts')
| -rw-r--r-- | erts/configure.in | 2 | ||||
| -rw-r--r-- | erts/doc/src/epmd.xml | 19 | ||||
| -rw-r--r-- | erts/doc/src/erl.xml | 9 | ||||
| -rw-r--r-- | erts/epmd/src/epmd.c | 37 | ||||
| -rw-r--r-- | erts/epmd/src/epmd_cli.c | 2 | ||||
| -rw-r--r-- | erts/epmd/src/epmd_int.h | 59 | ||||
| -rw-r--r-- | erts/epmd/src/epmd_srv.c | 207 |
7 files changed, 224 insertions, 111 deletions
diff --git a/erts/configure.in b/erts/configure.in index 8c6f2ac076..fdaeb90d9c 100644 --- a/erts/configure.in +++ b/erts/configure.in @@ -1716,7 +1716,7 @@ AC_CHECK_FUNCS([getnameinfo getipnodebyname getipnodebyaddr gethostbyname2]) AC_CHECK_FUNCS([ieee_handler fpsetmask finite isnan isinf res_gethostbyname dlopen \ pread pwrite writev memmove strerror strerror_r strncasecmp \ - gethrtime localtime_r gmtime_r mmap mremap memcpy mallopt \ + gethrtime localtime_r gmtime_r inet_pton mmap mremap memcpy mallopt \ sbrk _sbrk __sbrk brk _brk __brk \ flockfile fstat strlcpy strlcat setsid posix2time setlocale nl_langinfo poll]) diff --git a/erts/doc/src/epmd.xml b/erts/doc/src/epmd.xml index f01cf90a36..f2ea325be7 100644 --- a/erts/doc/src/epmd.xml +++ b/erts/doc/src/epmd.xml @@ -116,6 +116,16 @@ <p>These options are available when starting the actual name server. The name server is normally started automatically by the <c>erl</c> command (if not already available), but it can also be started at i.e. system start-up.</p> <taglist> + <tag><c><![CDATA[-address List]]></c></tag> + <item> + <p>Let this instance of <c>epmd</c> listen only on the + comma-separated list of IP addresses and on the loopback address + (which is implicitely added to the list if it has not been + specified). This can also be set using the + <c><![CDATA[ERL_EPMD_ADDRESS]]></c> environment variable, see the + section <seealso marker="#environment_variables">Environment + variables</seealso> below.</p> + </item> <tag><c><![CDATA[-port No]]></c></tag> <item> <p>Let this instance of epmd listen to another TCP port than @@ -228,6 +238,15 @@ <marker id="environment_variables"></marker> <title>Environment variables</title> <taglist> + <tag><c><![CDATA[ERL_EPMD_ADDRESS]]></c></tag> + <item> + <p>This environment variable may be set to a comma-separated + list of IP addresses, in which case the <c>epmd</c> daemon + will listen only on the specified address(es) and on the + loopback address (which is implicitely added to the list if it + has not been specified). The default behaviour is to listen on + all available IP addresses.</p> + </item> <tag><c><![CDATA[ERL_EPMD_PORT]]></c></tag> <item> <p>This environment variable can contain the port number epmd will use. diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml index 09c9cf6812..2fd804cd04 100644 --- a/erts/doc/src/erl.xml +++ b/erts/doc/src/erl.xml @@ -981,6 +981,15 @@ add to the code path. See <seealso marker="kernel:code">code(3)</seealso>.</p> </item> + <tag><c><![CDATA[ERL_EPMD_ADDRESS]]></c></tag> + <item> + <p>This environment variable may be set to a comma-separated + list of IP addresses, in which case the + <seealso marker="epmd">epmd</seealso> daemon + will listen only on the specified address(es) and on the + loopback address (which is implicitely added to the list if it + has not been specified).</p> + </item> <tag><c><![CDATA[ERL_EPMD_PORT]]></c></tag> <item> <p>This environment variable can contain the port number to use when diff --git a/erts/epmd/src/epmd.c b/erts/epmd/src/epmd.c index 65ff0cd6b2..9ba1069663 100644 --- a/erts/epmd/src/epmd.c +++ b/erts/epmd/src/epmd.c @@ -33,6 +33,7 @@ static void usage(EpmdVars *); static void run_daemon(EpmdVars*); +static char* get_addresses(void); static int get_port_no(void); static int check_relaxed(void); #ifdef __WIN32__ @@ -133,6 +134,7 @@ int main(int argc, char** argv) { EpmdVars g_empd_vars; EpmdVars *g = &g_empd_vars; + int i; #ifdef __WIN32__ WORD wVersionRequested; WSADATA wsaData; @@ -158,8 +160,9 @@ int main(int argc, char** argv) g->argv = NULL; #endif - g->port = get_port_no(); - g->debug = 0; + g->addresses = get_addresses(); + g->port = get_port_no(); + g->debug = 0; g->silent = 0; g->is_daemon = 0; @@ -168,12 +171,14 @@ int main(int argc, char** argv) g->delay_accept = 0; g->delay_write = 0; g->progname = argv[0]; - g->listenfd = -1; g->conn = NULL; g->nodes.reg = g->nodes.unreg = g->nodes.unreg_tail = NULL; g->nodes.unreg_count = 0; g->active_conn = 0; + for (i = 0; i < MAX_LISTEN_SOCKETS; i++) + g->listenfd[i] = -1; + argc--; argv++; while (argc > 0) { @@ -208,6 +213,11 @@ int main(int argc, char** argv) else usage(g); epmd_cleanup_exit(g,0); + } else if (strcmp(argv[0], "-address") == 0) { + if (argc == 1) + usage(g); + g->addresses = argv[1]; + argv += 2; argc -= 2; } else if (strcmp(argv[0], "-port") == 0) { if ((argc == 1) || ((g->port = atoi(argv[1])) == 0)) @@ -252,13 +262,10 @@ int main(int argc, char** argv) /* * max_conn must not be greater than FD_SETSIZE. * (at least QNX crashes) - * - * More correctly, it must be FD_SETSIZE - 1, beacuse the - * listen FD is stored outside the connection array. */ if (g->max_conn > FD_SETSIZE) { - g->max_conn = FD_SETSIZE - 1; + g->max_conn = FD_SETSIZE; } if (g->is_daemon) { @@ -393,11 +400,14 @@ static void run_daemon(EpmdVars *g) static void usage(EpmdVars *g) { - fprintf(stderr, "usage: epmd [-d|-debug] [DbgExtra...] [-port No] [-daemon]\n"); - fprintf(stderr, " [-relaxed_command_check]\n"); + fprintf(stderr, "usage: epmd [-d|-debug] [DbgExtra...] [-address List]\n"); + fprintf(stderr, " [-port No] [-daemon] [-relaxed_command_check]\n"); fprintf(stderr, " epmd [-d|-debug] [-port No] [-names|-kill|-stop name]\n\n"); fprintf(stderr, "See the Erlang epmd manual page for info about the usage.\n\n"); fprintf(stderr, "Regular options\n"); + fprintf(stderr, " -address List\n"); + fprintf(stderr, " Let epmd listen only on the comma-separated list of IP\n"); + fprintf(stderr, " addresses (and on the loopback interface).\n"); fprintf(stderr, " -port No\n"); fprintf(stderr, " Let epmd listen to another port than default %d\n", EPMD_PORT_NO); @@ -555,8 +565,9 @@ void epmd_cleanup_exit(EpmdVars *g, int exitval) epmd_conn_close(g,&g->conn[i]); free(g->conn); } - if(g->listenfd >= 0) - close(g->listenfd); + for(i=0; i < MAX_LISTEN_SOCKETS; i++) + if(g->listenfd[i] >= 0) + close(g->listenfd[i]); free_all_nodes(g); if(g->argv){ for(i=0; g->argv[i] != NULL; ++i) @@ -568,6 +579,10 @@ void epmd_cleanup_exit(EpmdVars *g, int exitval) exit(exitval); } +static char* get_addresses(void) +{ + return getenv("ERL_EPMD_ADDRESS"); +} static int get_port_no(void) { char* port_str = getenv("ERL_EPMD_PORT"); diff --git a/erts/epmd/src/epmd_cli.c b/erts/epmd/src/epmd_cli.c index 7c60ba0420..ac55ba6bb6 100644 --- a/erts/epmd/src/epmd_cli.c +++ b/erts/epmd/src/epmd_cli.c @@ -137,7 +137,7 @@ static int conn_to_epmd(EpmdVars *g) { /* store port number in unsigned short */ unsigned short sport = g->port; - SET_ADDR_LOOPBACK(address, FAMILY, sport); + SET_ADDR(address, EPMD_ADDR_LOOPBACK, sport); } if (connect(connect_sock, (struct sockaddr*)&address, sizeof address) < 0) diff --git a/erts/epmd/src/epmd_int.h b/erts/epmd/src/epmd_int.h index c2558d52a1..2a0de4df9c 100644 --- a/erts/epmd/src/epmd_int.h +++ b/erts/epmd/src/epmd_int.h @@ -168,42 +168,40 @@ #if defined(HAVE_IN6) && defined(AF_INET6) && defined(EPMD6) #define EPMD_SOCKADDR_IN sockaddr_in6 -#define FAMILY AF_INET6 - -#define SET_ADDR_LOOPBACK(addr, af, port) do { \ - memset((char*)&(addr), 0, sizeof(addr)); \ - (addr).sin6_family = (af); \ - (addr).sin6_flowinfo = 0; \ - (addr).sin6_addr = in6addr_loopback; \ - (addr).sin6_port = htons(port); \ +#define EPMD_IN_ADDR in6_addr +#define EPMD_S_ADDR s6_addr +#define EPMD_ADDR_LOOPBACK in6addr_loopback.s6_addr +#define EPMD_ADDR_ANY in6addr_any.s6_addr +#define FAMILY AF_INET6 + +#define SET_ADDR(dst, addr, port) do { \ + memset((char*)&(dst), 0, sizeof(dst)); \ + memcpy((char*)&(dst).sin6_addr.s6_addr, (char*)&(addr), 16); \ + (dst).sin6_family = AF_INET6; \ + (dst).sin6_flowinfo = 0; \ + (dst).sin6_port = htons(port); \ } while(0) -#define SET_ADDR_ANY(addr, af, port) do { \ - memset((char*)&(addr), 0, sizeof(addr)); \ - (addr).sin6_family = (af); \ - (addr).sin6_flowinfo = 0; \ - (addr).sin6_addr = in6addr_any; \ - (addr).sin6_port = htons(port); \ - } while(0) +#define IS_ADDR_LOOPBACK(addr) \ + (memcmp((addr).s6_addr, in6addr_loopback.s6_addr, 16) == 0) #else /* Not IP v6 */ #define EPMD_SOCKADDR_IN sockaddr_in -#define FAMILY AF_INET - -#define SET_ADDR_LOOPBACK(addr, af, port) do { \ - memset((char*)&(addr), 0, sizeof(addr)); \ - (addr).sin_family = (af); \ - (addr).sin_addr.s_addr = htonl(INADDR_LOOPBACK); \ - (addr).sin_port = htons(port); \ +#define EPMD_IN_ADDR in_addr +#define EPMD_S_ADDR s_addr +#define EPMD_ADDR_LOOPBACK htonl(INADDR_LOOPBACK) +#define EPMD_ADDR_ANY htonl(INADDR_ANY) +#define FAMILY AF_INET + +#define SET_ADDR(dst, addr, port) do { \ + memset((char*)&(dst), 0, sizeof(dst)); \ + (dst).sin_family = AF_INET; \ + (dst).sin_addr.s_addr = (addr); \ + (dst).sin_port = htons(port); \ } while(0) -#define SET_ADDR_ANY(addr, af, port) do { \ - memset((char*)&(addr), 0, sizeof(addr)); \ - (addr).sin_family = (af); \ - (addr).sin_addr.s_addr = htonl(INADDR_ANY); \ - (addr).sin_port = htons(port); \ - } while(0) +#define IS_ADDR_LOOPBACK(addr) ((addr).s_addr == htonl(INADDR_LOOPBACK)) #endif /* Not IP v6 */ @@ -231,6 +229,8 @@ /* Maximum length of a node name == atom name */ #define MAXSYMLEN 255 +#define MAX_LISTEN_SOCKETS 16 + #define INBUF_SIZE 1024 #define OUTBUF_SIZE 1024 @@ -299,7 +299,8 @@ typedef struct { Connection *conn; Nodes nodes; fd_set orig_read_mask; - int listenfd; + int listenfd[MAX_LISTEN_SOCKETS]; + char *addresses; char **argv; } EpmdVars; diff --git a/erts/epmd/src/epmd_srv.c b/erts/epmd/src/epmd_srv.c index ef471a473a..73b09e7299 100644 --- a/erts/epmd/src/epmd_srv.c +++ b/erts/epmd/src/epmd_srv.c @@ -24,6 +24,10 @@ #include "epmd.h" /* Renamed from 'epmd_r4.h' */ #include "epmd_int.h" +#ifndef INADDR_NONE +# define INADDR_NONE 0xffffffff +#endif + /* * * This server is a local name server for Erlang nodes. Erlang nodes can @@ -79,90 +83,154 @@ static void print_names(EpmdVars*); void run(EpmdVars *g) { - int listensock; + struct EPMD_SOCKADDR_IN iserv_addr[MAX_LISTEN_SOCKETS]; + int listensock[MAX_LISTEN_SOCKETS]; + int num_sockets; int i; int opt; - struct EPMD_SOCKADDR_IN iserv_addr; + unsigned short sport = g->port; node_init(g); g->conn = conn_init(g); dbg_printf(g,2,"try to initiate listening port %d", g->port); - - if ((listensock = socket(FAMILY,SOCK_STREAM,0)) < 0) { - dbg_perror(g,"error opening stream socket"); - epmd_cleanup_exit(g,1); - } - g->listenfd = listensock; + + if (g->addresses != NULL) + { + char *tmp; + char *token; + int loopback_ok = 0; + + if ((tmp = (char *)malloc(strlen(g->addresses) + 1)) == NULL) + { + dbg_perror(g,"cannot allocate memory"); + epmd_cleanup_exit(g,1); + } + strcpy(tmp,g->addresses); + + for(token = strtok(tmp,", "), num_sockets = 0; + token != NULL; + token = strtok(NULL,", "), num_sockets++) + { + struct EPMD_IN_ADDR addr; +#ifdef HAVE_INET_PTON + int ret; + + if ((ret = inet_pton(FAMILY,token,&addr)) == -1) + { + dbg_perror(g,"cannot convert IP address to network format"); + epmd_cleanup_exit(g,1); + } + else if (ret == 0) +#elif !defined(EPMD6) + if ((addr.EPMD_S_ADDR = inet_addr(token)) == INADDR_NONE) +#endif + { + dbg_tty_printf(g,0,"cannot parse IP address \"%s\"",token); + epmd_cleanup_exit(g,1); + } + + if (IS_ADDR_LOOPBACK(addr)) + loopback_ok = 1; + + if (num_sockets - loopback_ok == MAX_LISTEN_SOCKETS - 1) + { + dbg_tty_printf(g,0,"cannot listen on more than %d IP addresses", + MAX_LISTEN_SOCKETS); + epmd_cleanup_exit(g,1); + } + + SET_ADDR(iserv_addr[num_sockets],addr.EPMD_S_ADDR,sport); + } + + free(tmp); + + if (!loopback_ok) + { + SET_ADDR(iserv_addr[num_sockets],EPMD_ADDR_LOOPBACK,sport); + num_sockets++; + } + } + else + { + SET_ADDR(iserv_addr[0],EPMD_ADDR_ANY,sport); + num_sockets = 1; + } + +#if !defined(__WIN32__) + /* We ignore the SIGPIPE signal that is raised when we call write + twice on a socket closed by the other end. */ + signal(SIGPIPE, SIG_IGN); +#endif /* * Initialize number of active file descriptors. * Stdin, stdout, and stderr are still open. - * One for the listen socket. */ - g->active_conn = 3+1; + g->active_conn = 3 + num_sockets; + g->max_conn -= num_sockets; + + FD_ZERO(&g->orig_read_mask); + + for (i = 0; i < num_sockets; i++) + { + if ((listensock[i] = socket(FAMILY,SOCK_STREAM,0)) < 0) + { + dbg_perror(g,"error opening stream socket"); + epmd_cleanup_exit(g,1); + } + g->listenfd[i] = listensock[i]; - /* - * Note that we must not enable the SO_REUSEADDR on Windows, - * because addresses will be reused even if they are still in use. - */ + /* + * Note that we must not enable the SO_REUSEADDR on Windows, + * because addresses will be reused even if they are still in use. + */ #if !defined(__WIN32__) - /* We ignore the SIGPIPE signal that is raised when we call write - twice on a socket closed by the other end. */ - signal(SIGPIPE, SIG_IGN); - - opt = 1; /* Set this option */ - if (setsockopt(listensock,SOL_SOCKET,SO_REUSEADDR,(char* ) &opt, - sizeof(opt)) <0) { - dbg_perror(g,"can't set sockopt"); - epmd_cleanup_exit(g,1); - } + opt = 1; + if (setsockopt(listensock[i],SOL_SOCKET,SO_REUSEADDR,(char* ) &opt, + sizeof(opt)) <0) + { + dbg_perror(g,"can't set sockopt"); + epmd_cleanup_exit(g,1); + } #endif - /* In rare cases select returns because there is someone - to accept but the request is withdrawn before the - accept function is called. We set the listen socket - to be non blocking to prevent us from being hanging - in accept() waiting for the next request. */ + /* In rare cases select returns because there is someone + to accept but the request is withdrawn before the + accept function is called. We set the listen socket + to be non blocking to prevent us from being hanging + in accept() waiting for the next request. */ #if (defined(__WIN32__) || defined(NO_FCNTL)) - opt = 1; - if (ioctl(listensock, FIONBIO, &opt) != 0) /* Gives warning in VxWorks */ + opt = 1; + /* Gives warning in VxWorks */ + if (ioctl(listensock[i], FIONBIO, &opt) != 0) #else - opt = fcntl(listensock, F_GETFL, 0); - if (fcntl(listensock, F_SETFL, opt | O_NONBLOCK) == -1) + opt = fcntl(listensock[i], F_GETFL, 0); + if (fcntl(listensock[i], F_SETFL, opt | O_NONBLOCK) == -1) #endif /* __WIN32__ || VXWORKS */ - dbg_perror(g,"failed to set non-blocking mode of listening socket %d", - listensock); + dbg_perror(g,"failed to set non-blocking mode of listening socket %d", + listensock[i]); - { /* store port number in unsigned short */ - unsigned short sport = g->port; - SET_ADDR_ANY(iserv_addr, FAMILY, sport); - } - - if(bind(listensock,(struct sockaddr*) &iserv_addr, sizeof(iserv_addr)) < 0 ) - { - if (errno == EADDRINUSE) - { - dbg_tty_printf(g,1,"there is already a epmd running at port %d", - g->port); - epmd_cleanup_exit(g,0); - } - else + if (bind(listensock[i], (struct sockaddr*) &iserv_addr[i], + sizeof(iserv_addr[i])) < 0) { - dbg_perror(g,"failed to bind socket"); - epmd_cleanup_exit(g,1); + if (errno == EADDRINUSE) + { + dbg_tty_printf(g,1,"there is already a epmd running at port %d", + g->port); + epmd_cleanup_exit(g,0); + } + else + { + dbg_perror(g,"failed to bind socket"); + epmd_cleanup_exit(g,1); + } } + listen(listensock[i],SOMAXCONN); + FD_SET(listensock[i],&g->orig_read_mask); } - dbg_printf(g,2,"starting"); - - listen(listensock, SOMAXCONN); - - - FD_ZERO(&g->orig_read_mask); - FD_SET(listensock,&g->orig_read_mask); - dbg_tty_printf(g,2,"entering the main select() loop"); select_again: @@ -198,17 +266,18 @@ void run(EpmdVars *g) sleep(g->delay_accept); } - if (FD_ISSET(listensock,&read_mask)) { - if (do_accept(g, listensock) && g->active_conn < g->max_conn) { - /* - * The accept() succeeded, and we have at least one file - * descriptor still free, which means that another accept() - * could succeed. Go do do another select(), in case there - * are more incoming connections waiting to be accepted. - */ - goto select_again; + for (i = 0; i < num_sockets; i++) + if (FD_ISSET(listensock[i],&read_mask)) { + if (do_accept(g, listensock[i]) && g->active_conn < g->max_conn) { + /* + * The accept() succeeded, and we have at least one file + * descriptor still free, which means that another accept() + * could succeed. Go do do another select(), in case there + * are more incoming connections waiting to be accepted. + */ + goto select_again; + } } - } /* Check all open streams marked by select for data or a close. We also close all open sockets except ALIVE |