/* crypto/bio/b_sock.c */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ #include #include #include #include #include "cryptlib.h" #include #include #include #include #include #include #define SOCKET_PROTOCOL IPPROTO_TCP #ifdef SO_MAXCONN #define MAX_LISTEN SO_MAXCONN #elif defined(SOMAXCONN) #define MAX_LISTEN SOMAXCONN #else #define MAX_LISTEN 32 #endif static int get_ip(const char *str, unsigned char *ip); int BIO_get_host_ip(const char *str, unsigned char *ip) { int i; int err = 1; int locked = 0; struct hostent *he; i = get_ip(str, ip); if (i < 0) { BIOerr(BIO_F_BIO_GET_HOST_IP, BIO_R_INVALID_IP_ADDRESS); goto err; } /* At this point, we have something that is most probably correct in some way, so let's init the socket. */ if (BIO_sock_init() != 1) return 0; /* don't generate another error code here */ /* If the string actually contained an IP address, we need not do anything more */ if (i > 0) return (1); /* do a gethostbyname */ CRYPTO_w_lock(CRYPTO_LOCK_GETHOSTBYNAME); locked = 1; he = BIO_gethostbyname(str); if (he == NULL) { BIOerr(BIO_F_BIO_GET_HOST_IP, BIO_R_BAD_HOSTNAME_LOOKUP); goto err; } /* cast to short because of win16 winsock definition */ if ((short)he->h_addrtype != AF_INET) { BIOerr(BIO_F_BIO_GET_HOST_IP, BIO_R_GETHOSTBYNAME_ADDR_IS_NOT_AF_INET); goto err; } for (i = 0; i < 4; i++) ip[i] = he->h_addr_list[0][i]; err = 0; err: if (locked) CRYPTO_w_unlock(CRYPTO_LOCK_GETHOSTBYNAME); if (err) { ERR_add_error_data(2, "host=", str); return 0; } else return 1; } int BIO_get_port(const char *str, unsigned short *port_ptr) { int i; struct servent *s; if (str == NULL) { BIOerr(BIO_F_BIO_GET_PORT, BIO_R_NO_PORT_DEFINED); return (0); } i = atoi(str); if (i != 0) *port_ptr = (unsigned short)i; else { CRYPTO_w_lock(CRYPTO_LOCK_GETSERVBYNAME); s = getservbyname(str, "tcp"); if (s != NULL) *port_ptr = ntohs((unsigned short)s->s_port); CRYPTO_w_unlock(CRYPTO_LOCK_GETSERVBYNAME); if (s == NULL) { if (strcmp(str, "http") == 0) *port_ptr = 80; else if (strcmp(str, "telnet") == 0) *port_ptr = 23; else if (strcmp(str, "socks") == 0) *port_ptr = 1080; else if (strcmp(str, "https") == 0) *port_ptr = 443; else if (strcmp(str, "ssl") == 0) *port_ptr = 443; else if (strcmp(str, "ftp") == 0) *port_ptr = 21; else if (strcmp(str, "gopher") == 0) *port_ptr = 70; else { SYSerr(SYS_F_GETSERVBYNAME, errno); ERR_add_error_data(3, "service='", str, "'"); return (0); } } } return (1); } int BIO_sock_error(int sock) { int j, i; int size; size = sizeof(int); /* Note: under Windows the third parameter is of type (char *) * whereas under other systems it is (void *) if you don't have * a cast it will choke the compiler: if you do have a cast then * you can either go for (char *) or (void *). */ i = getsockopt(sock, SOL_SOCKET, SO_ERROR, (void *)&j, (void *)&size); if (i < 0) return (1); else return (j); } struct hostent * BIO_gethostbyname(const char *name) { return gethostbyname(name); } int BIO_sock_init(void) { return (1); } void BIO_sock_cleanup(void) { } int BIO_socket_ioctl(int fd, long type, void *arg) { int i; # define ARG arg i = ioctl(fd, type, ARG); if (i < 0) SYSerr(SYS_F_IOCTLSOCKET, errno); return (i); } /* The reason I have implemented this instead of using sscanf is because * Visual C 1.52c gives an unresolved external when linking a DLL :-( */ static int get_ip(const char *str, unsigned char ip[4]) { unsigned int tmp[4]; int num = 0, c, ok = 0; tmp[0] = tmp[1] = tmp[2] = tmp[3] = 0; for (;;) { c= *(str++); if ((c >= '0') && (c <= '9')) { ok = 1; tmp[num] = tmp[num]*10 + c-'0'; if (tmp[num] > 255) return (0); } else if (c == '.') { if (!ok) return (-1); if (num == 3) return (0); num++; ok = 0; } else if (c == '\0' && (num == 3) && ok) break; else return (0); } ip[0] = tmp[0]; ip[1] = tmp[1]; ip[2] = tmp[2]; ip[3] = tmp[3]; return (1); } int BIO_get_accept_socket(char *host, int bind_mode) { int ret = 0; union { struct sockaddr sa; struct sockaddr_in sa_in; struct sockaddr_in6 sa_in6; } server, client; int s = -1, cs, addrlen; unsigned char ip[4]; unsigned short port; char *str = NULL, *e; char *h, *p; unsigned long l; int err_num; if (BIO_sock_init() != 1) return (-1); if ((str = BUF_strdup(host)) == NULL) return (-1); h = p = NULL; h = str; for (e = str; *e; e++) { if (*e == ':') { p = e; } else if (*e == '/') { *e = '\0'; break; } } if (p) *p++='\0'; /* points at last ':', '::port' is special [see below] */ else p = h, h = NULL; #ifdef EAI_FAMILY do { static union { void *p; int (*f)(const char *, const char *, const struct addrinfo *, struct addrinfo **); } p_getaddrinfo = {NULL}; static union { void *p; void (*f)(struct addrinfo *); } p_freeaddrinfo = {NULL}; struct addrinfo *res, hint; if (p_getaddrinfo.p == NULL) { if ((p_getaddrinfo.p = DSO_global_lookup("getaddrinfo"))==NULL || (p_freeaddrinfo.p = DSO_global_lookup("freeaddrinfo"))==NULL) p_getaddrinfo.p = (void*) - 1; } if (p_getaddrinfo.p == (void *) - 1) break; /* '::port' enforces IPv6 wildcard listener. Some OSes, * e.g. Solaris, default to IPv6 without any hint. Also * note that commonly IPv6 wildchard socket can service * IPv4 connections just as well... */ memset(&hint, 0, sizeof(hint)); hint.ai_flags = AI_PASSIVE; if (h) { if (strchr(h, ':')) { if (h[1] == '\0') h = NULL; hint.ai_family = AF_INET6; } else if (h[0] == '*' && h[1] == '\0') { hint.ai_family = AF_INET; h = NULL; } } if ((*p_getaddrinfo.f)(h, p, &hint, &res)) break; addrlen = res->ai_addrlen <= sizeof(server) ? res->ai_addrlen : sizeof(server); memcpy(&server, res->ai_addr, addrlen); (*p_freeaddrinfo.f)(res); goto again; } while (0); #endif if (!BIO_get_port(p, &port)) goto err; memset((char *)&server, 0, sizeof(server)); server.sa_in.sin_family = AF_INET; server.sa_in.sin_port = htons(port); addrlen = sizeof(server.sa_in); if (h == NULL || strcmp(h, "*") == 0) server.sa_in.sin_addr.s_addr = INADDR_ANY; else { if (!BIO_get_host_ip(h, &(ip[0]))) goto err; l = (unsigned long)((unsigned long)ip[0]<<24L)| ((unsigned long)ip[1]<<16L)| ((unsigned long)ip[2]<< 8L)| ((unsigned long)ip[3]); server.sa_in.sin_addr.s_addr = htonl(l); } again: s = socket(server.sa.sa_family, SOCK_STREAM, SOCKET_PROTOCOL); if (s == -1) { SYSerr(SYS_F_SOCKET, errno); ERR_add_error_data(3, "port='", host, "'"); BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, BIO_R_UNABLE_TO_CREATE_SOCKET); goto err; } #ifdef SO_REUSEADDR if (bind_mode == BIO_BIND_REUSEADDR) { int i = 1; ret = setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char *)&i, sizeof(i)); bind_mode = BIO_BIND_NORMAL; } #endif if (bind(s, &server.sa, addrlen) == -1) { #ifdef SO_REUSEADDR err_num = errno; if ((bind_mode == BIO_BIND_REUSEADDR_IF_UNUSED) && (err_num == EADDRINUSE)) { client = server; if (h == NULL || strcmp(h, "*") == 0) { if (client.sa.sa_family == AF_INET6) { memset(&client.sa_in6.sin6_addr, 0, sizeof(client.sa_in6.sin6_addr)); client.sa_in6.sin6_addr.s6_addr[15] = 1; } else if (client.sa.sa_family == AF_INET) { client.sa_in.sin_addr.s_addr = htonl(0x7F000001); } else goto err; } cs = socket(client.sa.sa_family, SOCK_STREAM, SOCKET_PROTOCOL); if (cs != -1) { int ii; ii = connect(cs, &client.sa, addrlen); close(cs); if (ii == -1) { bind_mode = BIO_BIND_REUSEADDR; close(s); goto again; } /* else error */ } /* else error */ } #endif SYSerr(SYS_F_BIND, err_num); ERR_add_error_data(3, "port='", host, "'"); BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, BIO_R_UNABLE_TO_BIND_SOCKET); goto err; } if (listen(s, MAX_LISTEN) == -1) { SYSerr(SYS_F_BIND, errno); ERR_add_error_data(3, "port='", host, "'"); BIOerr(BIO_F_BIO_GET_ACCEPT_SOCKET, BIO_R_UNABLE_TO_LISTEN_SOCKET); goto err; } ret = 1; err: if (str != NULL) free(str); if ((ret == 0) && (s != -1)) { close(s); s = -1; } return (s); } int BIO_accept(int sock, char **addr) { int ret = -1; unsigned long l; unsigned short port; char *p; struct { /* * As for following union. Trouble is that there are platforms * that have socklen_t and there are platforms that don't, on * some platforms socklen_t is int and on some size_t. So what * one can do? One can cook #ifdef spaghetti, which is nothing * but masochistic. Or one can do union between int and size_t. * One naturally does it primarily for 64-bit platforms where * sizeof(int) != sizeof(size_t). But would it work? Note that * if size_t member is initialized to 0, then later int member * assignment naturally does the job on little-endian platforms * regardless accept's expectations! What about big-endians? * If accept expects int*, then it works, and if size_t*, then * length value would appear as unreasonably large. But this * won't prevent it from filling in the address structure. The * trouble of course would be if accept returns more data than * actual buffer can accomodate and overwrite stack... That's * where early OPENSSL_assert comes into picture. Besides, the * only 64-bit big-endian platform found so far that expects * size_t* is HP-UX, where stack grows towards higher address. * */ union { size_t s; int i; } len; union { struct sockaddr sa; struct sockaddr_in sa_in; struct sockaddr_in6 sa_in6; } from; } sa; sa.len.s = 0; sa.len.i = sizeof(sa.from); memset(&sa.from, 0, sizeof(sa.from)); ret = accept(sock, &sa.from.sa, (void *)&sa.len); if (sizeof(sa.len.i) != sizeof(sa.len.s) && sa.len.i == 0) { OPENSSL_assert(sa.len.s <= sizeof(sa.from)); sa.len.i = (int)sa.len.s; /* use sa.len.i from this point */ } if (ret == -1) { if (BIO_sock_should_retry(ret)) return -2; SYSerr(SYS_F_ACCEPT, errno); BIOerr(BIO_F_BIO_ACCEPT, BIO_R_ACCEPT_ERROR); goto end; } if (addr == NULL) goto end; #ifdef EAI_FAMILY do { char h[NI_MAXHOST], s[NI_MAXSERV]; size_t nl; static union { void *p; int (*f)(const struct sockaddr *, size_t/*socklen_t*/, char *, size_t, char *, size_t, int); } p_getnameinfo = {NULL}; /* 2nd argument to getnameinfo is specified to * be socklen_t. Unfortunately there is a number * of environments where socklen_t is not defined. * As it's passed by value, it's safe to pass it * as size_t... */ if (p_getnameinfo.p == NULL) { if ((p_getnameinfo.p = DSO_global_lookup("getnameinfo")) == NULL) p_getnameinfo.p = (void*) - 1; } if (p_getnameinfo.p == (void *) - 1) break; if ((*p_getnameinfo.f)(&sa.from.sa, sa.len.i, h, sizeof(h), s, sizeof(s), NI_NUMERICHOST|NI_NUMERICSERV)) break; nl = strlen(h) + strlen(s) + 2; p = *addr; if (p) { *p = '\0'; p = realloc(p, nl); } else { p = malloc(nl); } if (p == NULL) { BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE); goto end; } *addr = p; snprintf(*addr, nl, "%s:%s", h, s); goto end; } while (0); #endif if (sa.from.sa.sa_family != AF_INET) goto end; l = ntohl(sa.from.sa_in.sin_addr.s_addr); port = ntohs(sa.from.sa_in.sin_port); if (*addr == NULL) { if ((p = malloc(24)) == NULL) { BIOerr(BIO_F_BIO_ACCEPT, ERR_R_MALLOC_FAILURE); goto end; } *addr = p; } snprintf(*addr, 24, "%d.%d.%d.%d:%d", (unsigned char)(l >> 24L) & 0xff, (unsigned char)(l >> 16L) & 0xff, (unsigned char)(l >> 8L) & 0xff, (unsigned char)(l) & 0xff, port); end: return (ret); } int BIO_set_tcp_ndelay(int s, int on) { int ret = 0; #if defined(TCP_NODELAY) && (defined(IPPROTO_TCP) || defined(SOL_TCP)) int opt; #ifdef SOL_TCP opt = SOL_TCP; #else #ifdef IPPROTO_TCP opt = IPPROTO_TCP; #endif #endif ret = setsockopt(s, opt, TCP_NODELAY, (char *)&on, sizeof(on)); #endif return (ret == 0); } int BIO_socket_nbio(int s, int mode) { int ret = -1; int l; l = mode; #ifdef FIONBIO ret = BIO_socket_ioctl(s, FIONBIO, &l); #endif return (ret == 0); }