diff options
Diffstat (limited to 'source4/lib/util_sock.c')
| -rw-r--r-- | source4/lib/util_sock.c | 631 |
1 files changed, 631 insertions, 0 deletions
diff --git a/source4/lib/util_sock.c b/source4/lib/util_sock.c new file mode 100644 index 0000000000..42dc04f6c8 --- /dev/null +++ b/source4/lib/util_sock.c @@ -0,0 +1,631 @@ +/* + Unix SMB/CIFS implementation. + Samba utility functions + Copyright (C) Andrew Tridgell 1992-1998 + Copyright (C) Tim Potter 2000-2001 + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. +*/ + +#include "includes.h" + + +/**************************************************************************** + Determine if a file descriptor is in fact a socket. +****************************************************************************/ +BOOL is_a_socket(int fd) +{ + int v,l; + l = sizeof(int); + return getsockopt(fd, SOL_SOCKET, SO_TYPE, (char *)&v, &l) == 0; +} + +enum SOCK_OPT_TYPES {OPT_BOOL,OPT_INT,OPT_ON}; + +typedef struct smb_socket_option { + const char *name; + int level; + int option; + int value; + int opttype; +} smb_socket_option; + +static const smb_socket_option socket_options[] = { + {"SO_KEEPALIVE", SOL_SOCKET, SO_KEEPALIVE, 0, OPT_BOOL}, + {"SO_REUSEADDR", SOL_SOCKET, SO_REUSEADDR, 0, OPT_BOOL}, + {"SO_BROADCAST", SOL_SOCKET, SO_BROADCAST, 0, OPT_BOOL}, +#ifdef TCP_NODELAY + {"TCP_NODELAY", IPPROTO_TCP, TCP_NODELAY, 0, OPT_BOOL}, +#endif +#ifdef IPTOS_LOWDELAY + {"IPTOS_LOWDELAY", IPPROTO_IP, IP_TOS, IPTOS_LOWDELAY, OPT_ON}, +#endif +#ifdef IPTOS_THROUGHPUT + {"IPTOS_THROUGHPUT", IPPROTO_IP, IP_TOS, IPTOS_THROUGHPUT, OPT_ON}, +#endif +#ifdef SO_REUSEPORT + {"SO_REUSEPORT", SOL_SOCKET, SO_REUSEPORT, 0, OPT_BOOL}, +#endif +#ifdef SO_SNDBUF + {"SO_SNDBUF", SOL_SOCKET, SO_SNDBUF, 0, OPT_INT}, +#endif +#ifdef SO_RCVBUF + {"SO_RCVBUF", SOL_SOCKET, SO_RCVBUF, 0, OPT_INT}, +#endif +#ifdef SO_SNDLOWAT + {"SO_SNDLOWAT", SOL_SOCKET, SO_SNDLOWAT, 0, OPT_INT}, +#endif +#ifdef SO_RCVLOWAT + {"SO_RCVLOWAT", SOL_SOCKET, SO_RCVLOWAT, 0, OPT_INT}, +#endif +#ifdef SO_SNDTIMEO + {"SO_SNDTIMEO", SOL_SOCKET, SO_SNDTIMEO, 0, OPT_INT}, +#endif +#ifdef SO_RCVTIMEO + {"SO_RCVTIMEO", SOL_SOCKET, SO_RCVTIMEO, 0, OPT_INT}, +#endif + {NULL,0,0,0,0}}; + +/**************************************************************************** + Print socket options. +****************************************************************************/ + +static void print_socket_options(int s) +{ + int value, vlen = 4; + const smb_socket_option *p = &socket_options[0]; + + for (; p->name != NULL; p++) { + if (getsockopt(s, p->level, p->option, (void *)&value, &vlen) == -1) { + DEBUG(5,("Could not test socket option %s.\n", p->name)); + } else { + DEBUG(5,("socket option %s = %d\n",p->name,value)); + } + } + } + +/**************************************************************************** + Set user socket options. +****************************************************************************/ + +void set_socket_options(int fd, const char *options) +{ + fstring tok; + + while (next_token(&options,tok," \t,", sizeof(tok))) { + int ret=0,i; + int value = 1; + char *p; + BOOL got_value = False; + + if ((p = strchr_m(tok,'='))) { + *p = 0; + value = atoi(p+1); + got_value = True; + } + + for (i=0;socket_options[i].name;i++) + if (strequal(socket_options[i].name,tok)) + break; + + if (!socket_options[i].name) { + DEBUG(0,("Unknown socket option %s\n",tok)); + continue; + } + + switch (socket_options[i].opttype) { + case OPT_BOOL: + case OPT_INT: + ret = setsockopt(fd,socket_options[i].level, + socket_options[i].option,(char *)&value,sizeof(int)); + break; + + case OPT_ON: + if (got_value) + DEBUG(0,("syntax error - %s does not take a value\n",tok)); + + { + int on = socket_options[i].value; + ret = setsockopt(fd,socket_options[i].level, + socket_options[i].option,(char *)&on,sizeof(int)); + } + break; + } + + if (ret != 0) + DEBUG(0,("Failed to set socket option %s (Error %s)\n",tok, strerror(errno) )); + } + + print_socket_options(fd); +} + +/**************************************************************************** + Read from a socket. +****************************************************************************/ + +ssize_t read_udp_socket(int fd, char *buf, size_t len, + struct in_addr *from_addr, int *from_port) +{ + ssize_t ret; + struct sockaddr_in sock; + socklen_t socklen = sizeof(sock); + + ret = (ssize_t)sys_recvfrom(fd,buf,len, 0, (struct sockaddr *)&sock, &socklen); + if (ret <= 0) { + DEBUG(2,("read socket failed. ERRNO=%s\n",strerror(errno))); + return 0; + } + + if (from_addr) { + *from_addr = sock.sin_addr; + } + if (from_port) { + *from_port = ntohs(sock.sin_port); + } + + return ret; +} + + +/**************************************************************************** + read data from the client, reading exactly N bytes. +****************************************************************************/ +ssize_t read_data(int fd, char *buffer, size_t N) +{ + ssize_t ret; + size_t total=0; + + while (total < N) { + ret = sys_read(fd,buffer + total,N - total); + if (ret == 0) { + return 0; + } + if (ret == -1) { + return -1; + } + total += ret; + } + return (ssize_t)total; +} + + +/**************************************************************************** + Write data to a fd. +****************************************************************************/ +ssize_t write_data(int fd, const char *buffer, size_t N) +{ + size_t total=0; + ssize_t ret; + + while (total < N) { + ret = sys_write(fd, buffer + total, N - total); + if (ret == -1) { + return -1; + } + if (ret == 0) + return total; + + total += ret; + } + return (ssize_t)total; +} + + +/**************************************************************************** +send a keepalive packet (rfc1002) +****************************************************************************/ +BOOL send_nbt_keepalive(int sock_fd) +{ + unsigned char buf[4]; + + buf[0] = SMBkeepalive; + buf[1] = buf[2] = buf[3] = 0; + + return write_data(sock_fd,(char *)buf,4) == 4; +} + + +/**************************************************************************** + Open a socket of the specified type, port, and address for incoming data. +****************************************************************************/ +int open_socket_in( int type, int port, int dlevel, uint32 socket_addr, BOOL rebind ) +{ + struct sockaddr_in sock; + int res; + + memset( (char *)&sock, '\0', sizeof(sock) ); + +#ifdef HAVE_SOCK_SIN_LEN + sock.sin_len = sizeof(sock); +#endif + sock.sin_port = htons( port ); + sock.sin_family = AF_INET; + sock.sin_addr.s_addr = socket_addr; + + res = socket( AF_INET, type, 0 ); + if( res == -1 ) { + DEBUG(0,("open_socket_in(): socket() call failed: %s\n", strerror(errno))); + return -1; + } + + /* This block sets/clears the SO_REUSEADDR and possibly SO_REUSEPORT. */ + { + int val = rebind ? 1 : 0; + setsockopt(res,SOL_SOCKET,SO_REUSEADDR,(char *)&val,sizeof(val)); +#ifdef SO_REUSEPORT + setsockopt(res,SOL_SOCKET,SO_REUSEPORT,(char *)&val,sizeof(val)); +#endif + } + + /* now we've got a socket - we need to bind it */ + if( bind( res, (struct sockaddr *)&sock, sizeof(sock) ) == -1 ) { + DEBUG(0,("bind failed on port %d - %s\n", port, strerror(errno))); + close( res ); + return( -1 ); + } + + DEBUG( 10, ( "bind succeeded on port %d\n", port ) ); + + return( res ); + } + + +/**************************************************************************** + create an outgoing socket. timeout is in milliseconds. + **************************************************************************/ +int open_socket_out(int type, struct in_addr *addr, int port, int timeout) +{ + struct sockaddr_in sock_out; + int res,ret; + int connect_loop = 250; /* 250 milliseconds */ + int loops = (timeout) / connect_loop; + + /* create a socket to write to */ + res = socket(PF_INET, type, 0); + if (res == -1) + { DEBUG(0,("socket error\n")); return -1; } + + if (type != SOCK_STREAM) return(res); + + memset((char *)&sock_out,'\0',sizeof(sock_out)); + putip((char *)&sock_out.sin_addr,(char *)addr); + + sock_out.sin_port = htons( port ); + sock_out.sin_family = PF_INET; + + /* set it non-blocking */ + set_blocking(res,False); + + DEBUG(3,("Connecting to %s at port %d\n",inet_ntoa(*addr),port)); + + /* and connect it to the destination */ +connect_again: + ret = connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out)); + + /* Some systems return EAGAIN when they mean EINPROGRESS */ + if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY || + errno == EAGAIN) && loops--) { + msleep(connect_loop); + goto connect_again; + } + + if (ret < 0 && (errno == EINPROGRESS || errno == EALREADY || + errno == EAGAIN)) { + DEBUG(1,("timeout connecting to %s:%d\n",inet_ntoa(*addr),port)); + close(res); + return -1; + } + +#ifdef EISCONN + if (ret < 0 && errno == EISCONN) { + errno = 0; + ret = 0; + } +#endif + + if (ret < 0) { + DEBUG(2,("error connecting to %s:%d (%s)\n", + inet_ntoa(*addr),port,strerror(errno))); + close(res); + return -1; + } + + /* set it blocking again */ + set_blocking(res,True); + + return res; +} + +/* + open a connected UDP socket to host on port +*/ +int open_udp_socket(const char *host, int port) +{ + int type = SOCK_DGRAM; + struct sockaddr_in sock_out; + int res; + struct in_addr *addr; + TALLOC_CTX *mem_ctx; + + mem_ctx = talloc_init("open_udp_socket"); + if (!mem_ctx) { + return -1; + } + addr = interpret_addr2(mem_ctx, host); + + res = socket(PF_INET, type, 0); + if (res == -1) { + return -1; + } + + memset((char *)&sock_out,'\0',sizeof(sock_out)); + putip((char *)&sock_out.sin_addr,(char *)addr); + sock_out.sin_port = htons(port); + sock_out.sin_family = PF_INET; + + talloc_destroy(mem_ctx); + + if (connect(res,(struct sockaddr *)&sock_out,sizeof(sock_out))) { + close(res); + return -1; + } + + return res; +} + + +/******************************************************************* + matchname - determine if host name matches IP address. Used to + confirm a hostname lookup to prevent spoof attacks + ******************************************************************/ +static BOOL matchname(char *remotehost, struct in_addr addr) +{ + struct hostent *hp; + int i; + + if ((hp = sys_gethostbyname(remotehost)) == 0) { + DEBUG(0,("sys_gethostbyname(%s): lookup failure.\n", remotehost)); + return False; + } + + /* + * Make sure that gethostbyname() returns the "correct" host name. + * Unfortunately, gethostbyname("localhost") sometimes yields + * "localhost.domain". Since the latter host name comes from the + * local DNS, we just have to trust it (all bets are off if the local + * DNS is perverted). We always check the address list, though. + */ + + if (strcasecmp(remotehost, hp->h_name) + && strcasecmp(remotehost, "localhost")) { + DEBUG(0,("host name/name mismatch: %s != %s\n", + remotehost, hp->h_name)); + return False; + } + + /* Look up the host address in the address list we just got. */ + for (i = 0; hp->h_addr_list[i]; i++) { + if (memcmp(hp->h_addr_list[i], (char *) & addr, sizeof(addr)) == 0) + return True; + } + + /* + * The host name does not map to the original host address. Perhaps + * someone has compromised a name server. More likely someone botched + * it, but that could be dangerous, too. + */ + + DEBUG(0,("host name/address mismatch: %s != %s\n", + inet_ntoa(addr), hp->h_name)); + return False; +} + + +/******************************************************************* + return the DNS name of the remote end of a socket + ******************************************************************/ +char *get_socket_name(TALLOC_CTX *mem_ctx, int fd, BOOL force_lookup) +{ + char *name_buf; + char *addr_buf; + struct hostent *hp; + struct in_addr addr; + char *p; + + /* reverse lookups can be *very* expensive, and in many + situations won't work because many networks don't link dhcp + with dns. To avoid the delay we avoid the lookup if + possible */ + if (!lp_hostname_lookups() && (force_lookup == False)) { + return get_socket_addr(mem_ctx, fd); + } + + p = get_socket_addr(mem_ctx, fd); + + name_buf = talloc_strdup(mem_ctx, "UNKNOWN"); + if (fd == -1) return name_buf; + + addr_buf = talloc_strdup(mem_ctx, p); + + addr = *interpret_addr2(mem_ctx, p); + + /* Look up the remote host name. */ + if ((hp = gethostbyaddr((char *)&addr.s_addr, sizeof(addr.s_addr), AF_INET)) == 0) { + DEBUG(1,("Gethostbyaddr failed for %s\n",p)); + name_buf = talloc_strdup(mem_ctx, p); + } else { + name_buf = talloc_strdup(mem_ctx, (char *)hp->h_name); + if (!matchname(name_buf, addr)) { + DEBUG(0,("Matchname failed on %s %s\n",name_buf,p)); + name_buf = talloc_strdup(mem_ctx, "UNKNOWN"); + } + } + + alpha_strcpy(name_buf, name_buf, "_-.", sizeof(name_buf)); + if (strstr(name_buf,"..")) { + name_buf = talloc_strdup(mem_ctx, "UNKNOWN"); + } + + return name_buf; +} + +/******************************************************************* + return the IP addr of the remote end of a socket as a string + ******************************************************************/ +char *get_socket_addr(TALLOC_CTX *mem_ctx, int fd) +{ + struct sockaddr sa; + struct sockaddr_in *sockin = (struct sockaddr_in *) (&sa); + int length = sizeof(sa); + char *addr_buf; + + addr_buf = talloc_strdup(mem_ctx, "0.0.0.0"); + + if (fd == -1) { + return addr_buf; + } + + if (getpeername(fd, &sa, &length) < 0) { + DEBUG(0,("getpeername failed. Error was %s\n", strerror(errno) )); + return addr_buf; + } + + addr_buf = talloc_strdup(mem_ctx, (char *)inet_ntoa(sockin->sin_addr)); + + return addr_buf; +} + + + +/******************************************************************* +this is like socketpair but uses tcp. It is used by the Samba +regression test code +The function guarantees that nobody else can attach to the socket, +or if they do that this function fails and the socket gets closed +returns 0 on success, -1 on failure +the resulting file descriptors are symmetrical + ******************************************************************/ +static int socketpair_tcp(int fd[2]) +{ + int listener; + struct sockaddr_in sock; + struct sockaddr_in sock2; + socklen_t socklen = sizeof(sock); + int connect_done = 0; + + fd[0] = fd[1] = listener = -1; + + memset(&sock, 0, sizeof(sock)); + + if ((listener = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; + + memset(&sock2, 0, sizeof(sock2)); +#ifdef HAVE_SOCK_SIN_LEN + sock2.sin_len = sizeof(sock2); +#endif + sock2.sin_family = PF_INET; + + bind(listener, (struct sockaddr *)&sock2, sizeof(sock2)); + + if (listen(listener, 1) != 0) goto failed; + + if (getsockname(listener, (struct sockaddr *)&sock, &socklen) != 0) goto failed; + + if ((fd[1] = socket(PF_INET, SOCK_STREAM, 0)) == -1) goto failed; + + set_blocking(fd[1], 0); + + sock.sin_addr.s_addr = htonl(INADDR_LOOPBACK); + + if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) == -1) { + if (errno != EINPROGRESS) goto failed; + } else { + connect_done = 1; + } + + if ((fd[0] = accept(listener, (struct sockaddr *)&sock, &socklen)) == -1) goto failed; + + close(listener); + if (connect_done == 0) { + if (connect(fd[1],(struct sockaddr *)&sock,sizeof(sock)) != 0 + && errno != EISCONN) goto failed; + } + + set_blocking(fd[1], 1); + + /* all OK! */ + return 0; + + failed: + if (fd[0] != -1) close(fd[0]); + if (fd[1] != -1) close(fd[1]); + if (listener != -1) close(listener); + return -1; +} + + +/******************************************************************* +run a program on a local tcp socket, this is used to launch smbd +when regression testing +the return value is a socket which is attached to a subprocess +running "prog". stdin and stdout are attached. stderr is left +attached to the original stderr + ******************************************************************/ +int sock_exec(const char *prog) +{ + int fd[2]; + if (socketpair_tcp(fd) != 0) { + DEBUG(0,("socketpair_tcp failed (%s)\n", strerror(errno))); + return -1; + } + if (fork() == 0) { + close(fd[0]); + close(0); + close(1); + dup(fd[1]); + dup(fd[1]); + exit(system(prog)); + } + close(fd[1]); + return fd[0]; +} + + +/* + determine if a packet is pending for receive on a socket +*/ +BOOL socket_pending(int fd) +{ + fd_set fds; + int selrtn; + struct timeval timeout; + + FD_ZERO(&fds); + FD_SET(fd,&fds); + + /* immediate timeout */ + timeout.tv_sec = 0; + timeout.tv_usec = 0; + + /* yes, this is supposed to be a normal select not a sys_select() */ + selrtn = select(fd+1,&fds,NULL,NULL,&timeout); + + if (selrtn == 1) { + /* the fd is readable */ + return True; + } + + return False; +} |