*** /dev/null Fri Apr 19 09:15:37 2024
--- - Fri Apr 19 09:16:20 2024
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*** 0 ****
--- 1,957 ----
+ /*
+ ** SA - OSSP Socket Abstraction Library
+ ** Copyright (c) 2001 The OSSP Project (http://www.ossp.org/)
+ ** Copyright (c) 2001 Cable & Wireless Deutschland (http://www.cw.com/de/)
+ **
+ ** This file is part of OSSP SA, a socket abstraction library which
+ ** can be found at http://www.ossp.org/pkg/sa/.
+ **
+ ** Permission to use, copy, modify, and distribute this software for
+ ** any purpose with or without fee is hereby granted, provided that
+ ** the above copyright notice and this permission notice appear in all
+ ** copies.
+ **
+ ** THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED 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 AUTHORS AND COPYRIGHT HOLDERS AND THEIR
+ ** 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.
+ **
+ ** sa.c: socket abstraction library
+ */
+
+ /* include optional Autoconf header */
+ #ifdef HAVE_CONFIG_H
+ #include "config.h"
+ #endif
+
+ /* include system API headers */
+ #include <stdio.h>
+ #include <stdlib.h>
+ #include <stdarg.h>
+ #include <string.h>
+ #include <unistd.h>
+ #include <ctype.h>
+ #include <errno.h>
+ #include <fcntl.h>
+ #include <time.h>
+ #include <sys/time.h>
+ #include <netdb.h>
+ #include <sys/types.h>
+ #include <sys/un.h>
+ #include <netinet/in.h>
+ #include <sys/socket.h>
+ #include <arpa/inet.h>
+
+ /* include own API header */
+ #include "sa.h"
+
+ /* socket address abstraction object */
+ struct sa_addr_st {
+ struct sockaddr *saBuf;
+ socklen_t slBuf;
+ int nFamily;
+ int nProto;
+ };
+
+ /* socket abstraction object */
+ struct sa_st {
+ int sSocket;
+ int bTimeout;
+ struct timeval tvTimeout;
+ int nReadLen;
+ int nReadSize;
+ char *cpReadBuf;
+ int nWriteLen;
+ int nWriteSize;
+ char *cpWriteBuf;
+ };
+
+ /* make sure AF_LOCAL define exists */
+ #if !defined(AF_LOCAL) && defined(AF_UNIX)
+ #define AF_LOCAL AF_UNIX
+ #endif
+
+ /* make sure inet_pton() exists */
+ #if defined(HAVE_INET_PTON)
+ #define sa_inet_pton inet_pton
+ #elif defined(HAVE_INET_ATON)
+ static int inet_pton(int family, const char *strptr, void *addrptr)
+ {
+ struct in_addr in_val;
+
+ if (family == AF_INET) {
+ if (inet_aton(strptr, &in_val)) {
+ memcpy(addrptr, &in_val, sizeof(struct in_addr));
+ return 1;
+ }
+ return 0;
+ }
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
+ #else
+ #error "neither inet_pton nor inet_aton available"
+ #endif
+
+ /* make sure inet_ntop() exists */
+ #if defined(HAVE_INET_NTOP)
+ #define sa_inet_ntop inet_ntop
+ #elif defined(HAVE_INET_NTOA)
+ static char *inet_ntop(int family, const void *src, char *dst, size_t size)
+ {
+ struct in_addr in_val;
+ char *cp;
+ int n;
+
+ if (family == AF_INET) {
+ if ((cp = inet_ntoa(src)) != NULL) {
+ n = strlen(cp);
+ if (n > size-1)
+ n = size-1;
+ memcpy(dst, cp, n);
+ dst[n] = '\0';
+ return 1;
+ }
+ return 0;
+ }
+ errno = EAFNOSUPPORT;
+ return -1;
+ }
+ #else
+ #error "neither inet_ntop nor inet_ntoa available"
+ #endif
+
+ /* make sure vsnprintf() exists */
+ #if defined(HAVE_VSNPRINTF)
+ #define sa_vsnprintf vsnprintf
+ #elif defined(HAVE_VSPRINTF)
+ static int sa_vsnprintf(char *str, size_t size, const char *fmt, va_list ap)
+ {
+ int rv;
+
+ rv = vsprintf(str, fmt, ap);
+ if (rv > size) {
+ fprintf(stderr, "ERROR: vsprintf(3) buffer overflow!\n");
+ abort();
+ }
+ }
+ #else
+ #error "neither vsnprintf nor vsprintf available"
+ #endif
+
+ /* make sure snprintf() exists */
+ #if defined(HAVE_SNPRINTF)
+ #define sa_snprintf snprintf
+ #else
+ static int sa_snprintf(char *str, size_t size, const char *fmt, ...)
+ {
+ va_list ap;
+ int rv;
+
+ va_start(ap, fmt);
+ rv = sa_vsnprintf(str, size, fmt, ap);
+ va_end(ap);
+ return rv;
+ }
+ #endif
+
+ sa_rc_t sa_u2a(sa_addr_t **saa, const char *uri, ...)
+ {
+ va_list ap;
+ int nPort;
+ socklen_t sl;
+ struct sockaddr *sa;
+ struct sockaddr_in sa4;
+ #ifdef AF_INET6
+ struct sockaddr_in6 sa6;
+ #endif
+ struct hostent *he;
+ struct servent *se;
+ struct protoent *pe;
+ int bNumeric;
+ int i;
+ char *cpProto;
+ int nProto;
+ char *cpHost;
+ char *cpPort;
+ char uribuf[1024];
+ char *cp;
+ int sf;
+
+ /* argument sanity check */
+ if (saa == NULL || uri == NULL)
+ return SA_ERR_ARG;
+
+ /* on-the-fly create or just take over URI */
+ va_start(ap, uri);
+ sa_vsnprintf(uribuf, sizeof(uribuf), uri, ap);
+ va_end(ap);
+
+ /* parse URI into protocol, host and port parts */
+ uri = uribuf;
+ cpProto = "tcp";
+ if ((cp = strstr(uri, "://")) != NULL) {
+ cpProto = (char *)uri;
+ *cp = '\0';
+ uri = cp+3;
+ }
+ cpHost = (char *)uri;
+ if ((cp = strchr(uri, ':')) == NULL)
+ return SA_ERR_ARG;
+ *cp++ = '\0';
+ cpPort = cp;
+
+ /* resolve protocol */
+ if ((pe = getprotobyname(cpProto)) == NULL)
+ return SA_ERR_SYS;
+ nProto = pe->p_proto;
+
+ /* resolve port */
+ bNumeric = 1;
+ for (i = 0; cpPort[i] != '\0'; i++) {
+ if (!isdigit((int)cpPort[i])) {
+ bNumeric = 0;
+ break;
+ }
+ }
+ if (bNumeric)
+ nPort = atoi(cpPort);
+ else {
+ if ((se = getservbyname(cpPort, cpProto)) == NULL)
+ return SA_ERR_SYS;
+ nPort = ntohs(se->s_port);
+ }
+
+ /* mandatory(!) socket address structure initialization */
+ memset(&sa4, 0, sizeof(sa4));
+ #ifdef AF_INET6
+ memset(&sa6, 0, sizeof(sa6));
+ #endif
+
+ /* resolve host by trying to parse it as either directly a IPv4 or
+ IPv6 address or by resolving it to either a IPv4 or IPv6 address */
+ sa = NULL;
+ sl = 0;
+ sf = 0;
+ if (inet_pton(AF_INET, cpHost, &sa4.sin_addr.s_addr) == 1) {
+ sa4.sin_family = AF_INET;
+ sa4.sin_port = htons(nPort);
+ sa = (struct sockaddr *)&sa4;
+ sl = sizeof(sa4);
+ sf = AF_INET;
+ }
+ #ifdef AF_INET6
+ else if (inet_pton(AF_INET6, cpHost, &sa6.sin6_addr.s6_addr) == 1) {
+ sa6.sin6_family = AF_INET6;
+ sa6.sin6_port = htons(nPort);
+ sa = (struct sockaddr *)&sa6;
+ sl = sizeof(sa6);
+ sf = AF_INET6;
+ }
+ #endif
+ else if ((he = gethostbyname(cpHost)) != NULL) {
+ if (he->h_addrtype == AF_INET) {
+ sa4.sin_family = AF_INET;
+ sa4.sin_port = htons(nPort);
+ memcpy(&sa4.sin_addr.s_addr, he->h_addr_list[0], sizeof(sa4.sin_addr.s_addr));
+ sa = (struct sockaddr *)&sa4;
+ sl = sizeof(sa4);
+ sf = AF_INET;
+ }
+ #ifdef AF_INET6
+ else if (he->h_addrtype == AF_INET6) {
+ sa6.sin6_family = AF_INET6;
+ sa6.sin6_port = htons(nPort);
+ memcpy(&sa6.sin6_addr.s6_addr, he->h_addr_list[0], sizeof(sa6.sin6_addr.s6_addr));
+ sa = (struct sockaddr *)&sa6;
+ sl = sizeof(sa6);
+ sf = AF_INET6;
+ }
+ #endif
+ }
+ if (sa == NULL)
+ return SA_ERR_ARG;
+
+ /* create result address structure */
+ if ((*saa = (sa_addr_t *)malloc(sizeof(sa_addr_t))) == NULL)
+ return SA_ERR_MEM;
+ if (((*saa)->saBuf = (struct sockaddr *)malloc(sl)) == NULL) {
+ free(*saa);
+ return SA_ERR_MEM;
+ }
+ memcpy((*saa)->saBuf, sa, sl);
+ (*saa)->slBuf = sl;
+ (*saa)->nFamily = sf;
+ (*saa)->nProto = nProto;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_s2a(sa_addr_t **saa, const struct sockaddr *sabuf, socklen_t salen)
+ {
+ struct sockaddr_in *sa4;
+ #ifdef AF_INET6
+ struct sockaddr_in6 *sa6;
+ #endif
+ struct protoent *pe;
+ int sf;
+
+ if (saa == NULL || sabuf == NULL || salen == 0)
+ return SA_ERR_ARG;
+
+ /* create result address structure */
+ if ((*saa = (sa_addr_t *)malloc(sizeof(sa_addr_t))) == NULL)
+ return SA_ERR_MEM;
+ if (((*saa)->saBuf = (struct sockaddr *)malloc(salen)) == NULL) {
+ free(*saa);
+ return SA_ERR_MEM;
+ }
+ memcpy((*saa)->saBuf, sabuf, salen);
+ (*saa)->slBuf = salen;
+
+ /* fill in family */
+ sf = 0;
+ if (sizeof(struct sockaddr_in) == salen) {
+ sa4 = (struct sockaddr_in *)((void *)sabuf);
+ if (sa4->sin_family == AF_INET)
+ sf = AF_INET;
+ }
+ #ifdef AF_INET6
+ else if (sizeof(struct sockaddr_in6) == salen) {
+ sa6 = (struct sockaddr_in6 *)((void *)sabuf);
+ if (sa6->sin6_family == AF_INET6)
+ sf = AF_INET6;
+ }
+ #endif
+ (*saa)->nFamily = sf;
+
+ /* fill in protocol */
+ if ((pe = getprotobyname("tcp")) != NULL)
+ (*saa)->nProto = pe->p_proto;
+ else
+ (*saa)->nProto = 0;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_a2u(const sa_addr_t *saa, char **uri)
+ {
+ char uribuf[1024];
+ struct protoent *pe;
+ struct sockaddr_in *sa4;
+ #ifdef AF_INET6
+ struct sockaddr_in6 *sa6;
+ #endif
+ char caHost[512];
+ int nPort;
+
+ if (saa == NULL || uri == NULL)
+ return SA_ERR_ARG;
+ if ((pe = getprotobynumber(saa->nProto)) == NULL)
+ return SA_ERR_SYS;
+ if (saa->nFamily == AF_INET) {
+ sa4 = (struct sockaddr_in *)((void *)saa->saBuf);
+ inet_ntop(AF_INET, &sa4->sin_addr.s_addr, caHost, sizeof(caHost));
+ nPort = ntohs(sa4->sin_port);
+ }
+ #ifdef AF_INET6
+ else if (saa->nFamily == AF_INET6) {
+ sa6 = (struct sockaddr_in6 *)((void *)saa->saBuf);
+ inet_ntop(AF_INET6, &sa6->sin6_addr.s6_addr, caHost, sizeof(caHost));
+ nPort = ntohs(sa6->sin6_port);
+ }
+ #endif
+ else
+ return SA_ERR_ARG;
+ sa_snprintf(uribuf, sizeof(uribuf), "%s://%s:%d", pe->p_name, caHost, nPort);
+ *uri = strdup(uribuf);
+ return SA_OK;
+ }
+
+ sa_rc_t sa_a2s(const sa_addr_t *saa, struct sockaddr **sabuf, socklen_t *salen)
+ {
+ if (saa == NULL || sabuf == NULL || salen == 0)
+ return SA_ERR_ARG;
+
+ if ((*sabuf = (struct sockaddr *)malloc(saa->slBuf)) == NULL)
+ return SA_ERR_MEM;
+ memmove(*sabuf, saa->saBuf, saa->slBuf);
+ *salen = saa->slBuf;
+ return SA_OK;
+ }
+
+ static sa_rc_t sa_socket_init(sa_t *sa, int family, int proto)
+ {
+ int type;
+
+ if (sa == NULL)
+ return SA_ERR_ARG;
+ if (proto == IPPROTO_TCP)
+ type = SOCK_STREAM;
+ else if (proto == IPPROTO_UDP)
+ type = SOCK_DGRAM;
+ else
+ return SA_ERR_ARG;
+ if (sa->sSocket != -1)
+ return SA_ERR_USE;
+ if ((sa->sSocket = socket(family, type, proto)) == -1)
+ return SA_ERR_SYS;
+ return SA_OK;
+ }
+
+ static sa_rc_t sa_socket_kill(sa_t *sa)
+ {
+ if (sa == NULL)
+ return SA_ERR_ARG;
+ if (sa->sSocket != -1) {
+ close(sa->sSocket);
+ sa->sSocket = -1;
+ }
+ return SA_OK;
+ }
+
+ sa_rc_t sa_create(sa_t **sap)
+ {
+ sa_t *sa;
+
+ if ((sa = (sa_t *)malloc(sizeof(sa_t))) == NULL)
+ return SA_ERR_MEM;
+ sa->sSocket = -1;
+ sa->bTimeout = 0;
+ sa->nReadLen = 0;
+ sa->nReadSize = 1024;
+ if ((sa->cpReadBuf = (char *)malloc(sa->nReadSize)) == NULL) {
+ free(sa);
+ return SA_ERR_MEM;
+ }
+ sa->nWriteLen = 0;
+ sa->nWriteSize = 1024;
+ if ((sa->cpWriteBuf = (char *)malloc(sa->nWriteSize)) == NULL) {
+ free(sa->cpReadBuf);
+ free(sa);
+ return SA_ERR_MEM;
+ }
+ *sap = sa;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_destroy(sa_t *sa)
+ {
+ if (sa == NULL)
+ return SA_ERR_ARG;
+ sa_socket_kill(sa);
+ if (sa->cpReadBuf != NULL)
+ free(sa->cpReadBuf);
+ if (sa->cpWriteBuf != NULL)
+ free(sa->cpWriteBuf);
+ free(sa);
+ return SA_OK;
+ }
+
+ sa_rc_t sa_timeout(sa_t *sa, long sec, long usec)
+ {
+ if (sa == NULL)
+ return SA_ERR_ARG;
+ if (sec == 0 && usec == 0) {
+ sa->bTimeout = 0;
+ sa->tvTimeout.tv_sec = 0;
+ sa->tvTimeout.tv_usec = 0;
+ }
+ else {
+ sa->bTimeout = 1;
+ sa->tvTimeout.tv_sec = sec;
+ sa->tvTimeout.tv_usec = usec;
+ }
+ return SA_OK;
+ }
+
+ sa_rc_t sa_buffers(sa_t *sa, size_t rsize, size_t wsize)
+ {
+ char *cp;
+
+ if (sa == NULL)
+ return SA_ERR_ARG;
+ if (sa->nReadLen > rsize || sa->nWriteLen > wsize)
+ return SA_ERR_ARG;
+ if ((cp = (char *)realloc(sa->cpReadBuf, rsize)) == NULL)
+ return SA_ERR_SYS;
+ sa->cpReadBuf = cp;
+ sa->nReadSize = rsize;
+ if ((cp = (char *)realloc(sa->cpWriteBuf, wsize)) == NULL)
+ return SA_ERR_SYS;
+ sa->cpWriteBuf = cp;
+ sa->nWriteSize = wsize;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_bind(sa_t *sa, sa_addr_t *laddr)
+ {
+ sa_rc_t rv;
+
+ if (sa == NULL || laddr == NULL)
+ return SA_ERR_ARG;
+ if (sa->sSocket == -1)
+ if ((rv = sa_socket_init(sa, laddr->nFamily, laddr->nProto)) != SA_OK)
+ return rv;
+ if (bind(sa->sSocket, laddr->saBuf, laddr->slBuf) == -1)
+ return SA_ERR_SYS;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_connect(sa_t *sa, sa_addr_t *raddr)
+ {
+ int flags, n, error;
+ fd_set rset, wset;
+ socklen_t len;
+ sa_rc_t rv;
+
+ if (sa == NULL)
+ return SA_ERR_ARG;
+
+ if (sa->sSocket == -1)
+ if ((rv = sa_socket_init(sa, raddr->nFamily, raddr->nProto)) != SA_OK)
+ return rv;
+
+ if (!sa->bTimeout)
+ return connect(sa->sSocket, raddr->saBuf, raddr->slBuf);
+
+ error = 0;
+ rv = SA_OK;
+
+ /* remember socket flags */
+ flags = fcntl(sa->sSocket, F_GETFL, 0);
+
+ /* switch to non-blocking mode */
+ fcntl(sa->sSocket, F_SETFL, flags|O_NONBLOCK);
+
+ /* perform the connect */
+ if ((n = connect(sa->sSocket, raddr->saBuf, raddr->slBuf)) < 0) {
+ if (errno != EINPROGRESS) {
+ error = errno;
+ goto done;
+ }
+ }
+
+ /* if connect completed immediately */
+ if (n == 0)
+ goto done;
+
+ /* wait for read or write possibility */
+ FD_ZERO(&rset);
+ FD_ZERO(&wset);
+ FD_SET(sa->sSocket, &rset);
+ FD_SET(sa->sSocket, &wset);
+ do {
+ n = select(sa->sSocket+1, &rset, &wset, NULL, &sa->tvTimeout);
+ } while (n == -1 && errno == EINTR);
+
+ /* decide on return semantic */
+ if (n < 0) {
+ error = errno;
+ goto done;
+ }
+ else if (n == 0) {
+ error = ETIMEDOUT;
+ goto done;
+ }
+
+ /* fetch pending error */
+ len = sizeof(error);
+ if (getsockopt(sa->sSocket, SOL_SOCKET, SO_ERROR, &error, &len) < 0)
+ error = errno;
+
+ done:
+
+ /* reset socket flags */
+ fcntl(sa->sSocket, F_SETFL, flags);
+
+ /* optionally set errno */
+ if (error != 0) {
+ errno = error;
+ rv = SA_ERR_SYS;
+ }
+
+ return rv;
+ }
+
+ sa_rc_t sa_listen(sa_t *sa, int backlog)
+ {
+ if (sa == NULL)
+ return SA_ERR_ARG;
+ if (sa->sSocket == -1)
+ /* at least sa_bind() has to be already performed */
+ return SA_ERR_USE;
+ if (listen(sa->sSocket, backlog) == -1)
+ return SA_ERR_SYS;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_accept(sa_t *sa, sa_addr_t **caddr, sa_t **csa)
+ {
+ sa_rc_t rv;
+ int n;
+ fd_set fds;
+ union {
+ struct sockaddr_in sa4;
+ #ifdef AF_INET6
+ struct sockaddr_in6 sa6;
+ #endif
+ } sa_buf;
+ socklen_t sa_len;
+ int s;
+
+ if (sa == NULL)
+ return SA_ERR_ARG;
+ if (sa->sSocket == -1)
+ /* at least sa_listen() has to be already performed */
+ return SA_ERR_USE;
+ if (sa->bTimeout) {
+ FD_ZERO(&fds);
+ FD_SET(sa->sSocket, &fds);
+ do {
+ n = select(sa->sSocket+1, &fds, NULL, NULL, &sa->tvTimeout);
+ } while (n == -1 && errno == EINTR);
+ if (n == 0)
+ errno = ETIMEDOUT;
+ if (n <= 0)
+ return SA_ERR_SYS;
+ }
+ sa_len = sizeof(sa_buf);
+ if ((s = accept(sa->sSocket, (struct sockaddr *)&sa_buf, &sa_len)) == -1)
+ return SA_ERR_SYS;
+ if ((rv = sa_s2a(caddr, (struct sockaddr *)&sa_buf, sa_len)) != SA_OK)
+ return rv;
+ if ((rv = sa_create(csa)) != SA_OK) {
+ free(*caddr);
+ return rv;
+ }
+ (*csa)->sSocket = s;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_getremote(sa_t *sa, sa_addr_t **raddr)
+ {
+ sa_rc_t rv;
+ union {
+ struct sockaddr_in sa4;
+ #ifdef AF_INET6
+ struct sockaddr_in6 sa6;
+ #endif
+ } sa_buf;
+ socklen_t sa_len;
+
+ if (sa == NULL)
+ return SA_ERR_ARG;
+ sa_len = sizeof(sa_buf);
+ if (getpeername(sa->sSocket, (struct sockaddr *)&sa_buf, &sa_len) < 0)
+ return SA_ERR_SYS;
+ if ((rv = sa_s2a(raddr, (struct sockaddr *)&sa_buf, sa_len)) != SA_OK)
+ return rv;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_getlocal(sa_t *sa, sa_addr_t **laddr)
+ {
+ sa_rc_t rv;
+ union {
+ struct sockaddr_in sa4;
+ #ifdef AF_INET6
+ struct sockaddr_in6 sa6;
+ #endif
+ } sa_buf;
+ socklen_t sa_len;
+
+ if (sa == NULL)
+ return SA_ERR_ARG;
+ sa_len = sizeof(sa_buf);
+ if (getsockname(sa->sSocket, (struct sockaddr *)&sa_buf, &sa_len) < 0)
+ return SA_ERR_SYS;
+ if ((rv = sa_s2a(laddr, (struct sockaddr *)&sa_buf, sa_len)) != SA_OK)
+ return rv;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_getfd(sa_t *sa, int *fd)
+ {
+ if (sa == NULL || fd == NULL)
+ return SA_ERR_ARG;
+ *fd = sa->sSocket;
+ return SA_OK;
+ }
+
+ static int sa_read_raw(sa_t *sa, char *cpBuf, int nBufLen)
+ {
+ int rv;
+ fd_set fds;
+
+ if (sa->bTimeout) {
+ FD_ZERO(&fds);
+ FD_SET(sa->sSocket, &fds);
+ do {
+ rv = select(sa->sSocket+1, &fds, NULL, NULL, &sa->tvTimeout);
+ } while (rv == -1 && errno == EINTR);
+ if (rv == 0) {
+ errno = ETIMEDOUT;
+ return -1;
+ }
+ }
+ do {
+ rv = read(sa->sSocket, cpBuf, nBufLen);
+ } while (rv == -1 && errno == EINTR);
+ return rv;
+ }
+
+ sa_rc_t sa_read(sa_t *sa, char *cpBuf, size_t nBufReq, size_t *nBufRes)
+ {
+ int n;
+ int rv;
+ size_t res;
+
+ if (sa == NULL || cpBuf == NULL || nBufReq == 0)
+ return 0;
+
+ /* flush write buffer */
+ if (sa->nWriteLen > 0)
+ sa_flush(sa);
+ rv = SA_OK;
+ res = 0;
+ while (1) {
+ if (nBufReq <= sa->nReadLen) {
+ /* buffer holds enough data, so use this */
+ memmove(cpBuf, sa->cpReadBuf, nBufReq);
+ memmove(sa->cpReadBuf, sa->cpReadBuf+nBufReq, sa->nReadLen-nBufReq);
+ sa->nReadLen -= nBufReq;
+ res += nBufReq;
+ }
+ else {
+ if (sa->nReadLen > 0) {
+ /* fetch already existing buffer contents as a start */
+ memmove(cpBuf, sa->cpReadBuf, sa->nReadLen);
+ nBufReq -= sa->nReadLen;
+ cpBuf += sa->nReadLen;
+ res += sa->nReadLen;
+ sa->nReadLen = 0;
+ }
+ if (nBufReq >= sa->nReadSize) {
+ /* buffer is too small at all, so read directly */
+ n = sa_read_raw(sa, cpBuf, nBufReq);
+ if (n > 0)
+ res += n;
+ else if (n <= 0)
+ rv = SA_ERR_SYS;
+ }
+ else {
+ /* fill buffer with new data */
+ n = sa_read_raw(sa, sa->cpReadBuf, sa->nReadSize);
+ if (n <= 0)
+ rv = SA_ERR_SYS;
+ else {
+ sa->nReadLen = n;
+ continue;
+ }
+ }
+ }
+ break;
+ }
+ if (nBufRes != NULL)
+ *nBufRes = res;
+ return rv;
+ }
+
+ sa_rc_t sa_readfrom(sa_t *sa, char *buf, size_t buflen, size_t *bufdone, sa_addr_t **raddr)
+ {
+ sa_rc_t rv;
+ union {
+ struct sockaddr_in sa4;
+ #ifdef AF_INET6
+ struct sockaddr_in6 sa6;
+ #endif
+ } sa_buf;
+ socklen_t sa_len;
+ size_t n;
+ fd_set fds;
+
+ if (sa == NULL || buf == NULL || buflen == 0 || raddr == NULL)
+ return SA_ERR_ARG;
+ if (sa->bTimeout) {
+ FD_ZERO(&fds);
+ FD_SET(sa->sSocket, &fds);
+ do {
+ n = select(sa->sSocket+1, &fds, NULL, NULL, &sa->tvTimeout);
+ } while (n == -1 && errno == EINTR);
+ if (n == 0)
+ errno = ETIMEDOUT;
+ if (n <= 0)
+ return SA_ERR_SYS;
+ }
+ sa_len = sizeof(sa_buf);
+ if ((n = recvfrom(sa->sSocket, buf, buflen, 0, (struct sockaddr *)&sa_buf, &sa_len)) == -1)
+ return SA_ERR_SYS;
+ if ((rv = sa_s2a(raddr, (struct sockaddr *)&sa_buf, sa_len)) != SA_OK)
+ return rv;
+ if (bufdone != NULL)
+ *bufdone = n;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_readline(sa_t *sa, char *cpBuf, size_t nBufReq, size_t *nBufRes)
+ {
+ char c;
+ size_t n;
+ size_t res;
+
+ if (sa == NULL)
+ return SA_ERR_ARG;
+ res = 0;
+ while (res < (nBufReq-1)) {
+ sa_read(sa, &c, 1, &n);
+ if (n <= 0)
+ break;
+ cpBuf[res++] = c;
+ if (c == '\n')
+ break;
+ }
+ cpBuf[res] = '\0';
+ if (nBufRes != NULL)
+ *nBufRes = res;
+ return SA_OK;
+ }
+
+ static int sa_write_raw(sa_t *sa, const char *cpBuf, int nBufLen)
+ {
+ int rv;
+ fd_set fds;
+
+ if (sa->bTimeout) {
+ FD_ZERO(&fds);
+ FD_SET(sa->sSocket, &fds);
+ do {
+ rv = select(sa->sSocket+1, NULL, &fds, NULL, &sa->tvTimeout);
+ } while (rv == -1 && errno == EINTR);
+ if (rv == 0) {
+ errno = ETIMEDOUT;
+ return -1;
+ }
+ }
+ do {
+ rv = write(sa->sSocket, cpBuf, nBufLen);
+ } while (rv == -1 && errno == EINTR);
+ return rv;
+ }
+
+ sa_rc_t sa_write(sa_t *sa, const char *cpBuf, size_t nBufReq, size_t *nBufRes)
+ {
+ size_t n;
+ size_t res;
+
+ if (sa == NULL)
+ return SA_ERR_ARG;
+
+ if (nBufReq > (sa->nWriteSize - sa->nWriteLen)) {
+ /* not enough space in buffer, so flush buffer */
+ sa_flush(sa);
+ }
+ res = 0;
+ if (nBufReq >= sa->nWriteSize) {
+ /* buffer too small at all, so write immediately */
+ while (nBufReq > 0) {
+ n = sa_write_raw(sa, cpBuf, nBufReq);
+ if (n <= 0)
+ break;
+ nBufReq -= n;
+ cpBuf += n;
+ res += n;
+ }
+ }
+ else {
+ /* (again) enough sprace in buffer, so store data */
+ memmove(sa->cpWriteBuf+sa->nWriteLen, cpBuf, nBufReq);
+ sa->nWriteLen += nBufReq;
+ res = nBufReq;
+ }
+ if (nBufRes != NULL)
+ *nBufRes = res;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_writeto(sa_t *sa, const char *buf, size_t buflen, size_t *bufdone, sa_addr_t *raddr)
+ {
+ size_t n;
+ fd_set fds;
+
+ if (sa == NULL || buf == NULL || buflen == 0 || raddr == NULL)
+ return SA_ERR_ARG;
+ if (sa->bTimeout) {
+ FD_ZERO(&fds);
+ FD_SET(sa->sSocket, &fds);
+ do {
+ n = select(sa->sSocket+1, NULL, &fds, NULL, &sa->tvTimeout);
+ } while (n == -1 && errno == EINTR);
+ if (n == 0)
+ errno = ETIMEDOUT;
+ if (n <= 0)
+ return SA_ERR_SYS;
+ }
+ if ((n = sendto(sa->sSocket, buf, buflen, 0, raddr->saBuf, raddr->slBuf)) == -1)
+ return SA_ERR_SYS;
+ if (bufdone != NULL)
+ *bufdone = n;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_printf(sa_t *sa, const char *cpFmt, ...)
+ {
+ va_list ap;
+ size_t n;
+ char caBuf[1024];
+
+ if (sa == NULL)
+ return SA_ERR_ARG;
+ va_start(ap, cpFmt);
+ n = sa_vsnprintf(caBuf, sizeof(caBuf), cpFmt, ap);
+ sa_write(sa, caBuf, n, &n);
+ va_end(ap);
+ return SA_OK;
+ }
+
+ sa_rc_t sa_flush(sa_t *sa)
+ {
+ size_t n;
+
+ if (sa == NULL)
+ return SA_ERR_ARG;
+ while (sa->nWriteLen > 0) {
+ n = sa_write_raw(sa, sa->cpWriteBuf, sa->nWriteLen);
+ if (n <= 0)
+ break;
+ memmove(sa->cpWriteBuf, sa->cpWriteBuf+n, sa->nWriteLen-n);
+ sa->nWriteLen -= n;
+ }
+ sa->nWriteLen = 0;
+ return SA_OK;
+ }
+
+ sa_rc_t sa_shutdown(sa_t *sa, char *flags)
+ {
+ int how;
+
+ if (sa == NULL || flags == NULL)
+ return SA_ERR_ARG;
+ how = 0;
+ if (strcmp(flags, "r") == 0)
+ how = SHUT_RD;
+ else if (strcmp(flags, "w") == 0)
+ how = SHUT_WR;
+ else if (strcmp(flags, "rw") == 0)
+ how = SHUT_RDWR;
+ if (shutdown(sa->sSocket, how) == -1)
+ return SA_ERR_SYS;
+ return SA_OK;
+ }
+
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