Validate.
/*
* socket.c -- socket library functions
*
* Copyright 1998 by Eric S. Raymond.
* For license terms, see the file COPYING in this directory.
*/
#include "config.h"
#include <stdio.h
#include <errno.h
#include <string.h
#include <ctype.h> /* isspace() */
#ifdef HAVE_MEMORY_H
#include <memory.h
#endif /* HAVE_MEMORY_H */
#include <sys/types.h
#ifndef HAVE_NET_SOCKET_H
#include <sys/socket.h
#else
#include <net/socket.h
#endif
#include <sys/un.h
#include <netinet/in.h
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h
#endif
#include <netdb.h
#if defined(STDC_HEADERS)
#include <stdlib.h
#endif
#if defined(HAVE_UNISTD_H)
#include <unistd.h
#endif
#if defined(HAVE_STDARG_H)
#include <stdarg.h
#else
#include <varargs.h
#endif
#include "socket.h"
#include "fetchmail.h"
#include "i18n.h"
/* Defines to allow BeOS and Cygwin to play nice... */
#ifdef __BEOS__
static char peeked;
#define fm_close(a) closesocket(a)
#define fm_write(a,b,c) send(a,b,c,0)
#define fm_peek(a,b,c) recv(a,b,c,0)
#define fm_read(a,b,c) recv(a,b,c,0)
#else
#define fm_close(a) close(a)
#define fm_write(a,b,c) write(a,b,c)
#define fm_peek(a,b,c) recv(a,b,c, MSG_PEEK)
#ifdef __CYGWIN__
#define fm_read(a,b,c) cygwin_read(a,b,c)
static ssize_t cygwin_read(int sock, void *buf, size_t count);
#else /* ! __CYGWIN__ */
#define fm_read(a,b,c) read(a,b,c)
#endif /* __CYGWIN__ */
#endif
/* We need to define h_errno only if it is not already */
#ifndef h_errno
#ifdef HAVE_RES_SEARCH
/* some versions of FreeBSD should declare this but don't */
extern int h_errno;
#else
/* pretend we have h_errno to avoid some #ifdef's later */
static int h_errno;
#endif
#endif /* ndef h_errno */
extern int mailserver_socket_temp; /* Socket to close if connect
timeout */
#if NET_SECURITY
#include <net/security.h
#endif /* NET_SECURITY */
#ifdef HAVE_SOCKETPAIR
char *const *parse_plugin(const char *plugin, const char *host, const
char *service)
{ const char **argvec;
const char *c, *p;
char *cp, *plugin_copy;
unsigned int plugin_copy_len;
unsigned int plugin_offset = 0, plugin_copy_offset = 0;
unsigned int i, s = 2 * sizeof(char*), host_count = 0,
service_count =
0;
unsigned int plugin_len = strlen(plugin);
unsigned int host_len = strlen(host);
unsigned int service_len = strlen(service);
for (c = p = plugin; *c; c++)
{ if (isspace(*c) && !isspace(*p))
s += sizeof(char*);
if (*p == '%' && *c == 'h')
host_count++;
if (*p == '%' && *c == 'p')
service_count++;
p = c;
}
plugin_copy_len = plugin_len + host_len * host_count +
service_len *
service_count;
plugin_copy = malloc(plugin_copy_len + 1);
if (!plugin_copy)
{
report(stderr, GT_("fetchmail: malloc failed\n"));
return NULL;
}
while (plugin_copy_offset < plugin_copy_len)
{ if ((plugin[plugin_offset] == '%') &&
(plugin[plugin_offset + 1] ==
'h'))
{ strcpy(plugin_copy + plugin_copy_offset, host);
plugin_offset += 2;
plugin_copy_offset += host_len;
}
else if ((plugin[plugin_offset] == '%') &&
(plugin[plugin_offset + 1]
== 'p'))
{ strcpy(plugin_copy + plugin_copy_offset,
service);
plugin_offset += 2;
plugin_copy_offset += service_len;
}
else
{ plugin_copy[plugin_copy_offset] =
plugin[plugin_offset];
plugin_offset++;
plugin_copy_offset++;
}
}
plugin_copy[plugin_copy_len] = 0;
argvec = malloc(s);
if (!argvec)
{
report(stderr, GT_("fetchmail: malloc failed\n"));
return NULL;
}
memset(argvec, 0, s);
for (c = p = plugin_copy, i = 0; *c; c++)
{ if ((!isspace(*c)) && (c == p ? 1 : isspace(*p))) {
argvec[i] = c;
i++;
}
p = c;
}
for (cp = plugin_copy; *cp; cp++)
{ if (isspace(*cp))
*cp = 0;
}
return (char *const*)argvec;
}
static int handle_plugin(const char *host,
const char *service, const char *plugin)
/* get a socket mediated through a given external command */
{
int fds[2];
char *const *argvec;
/*
* The author of this code, Felix von Leitner
f...@convergence.de>, says:
* he chose socketpair() instead of pipe() because socketpair
creates
* bidirectional sockets while allegedly some pipe()
implementations don't.
*/
if (socketpair(AF_UNIX,SOCK_STREAM,0,fds))
{
report(stderr, GT_("fetchmail: socketpair failed\n"));
return -1;
}
switch (fork()) {
case -1:
/* error */
report(stderr, GT_("fetchmail: fork failed\n"));
return -1;
break;
case 0: /* child */
/* fds[1] is the parent's end; close it for proper EOF
** detection */
(void) close(fds[1]);
if ( (dup2(fds[0],0) == -1) || (dup2(fds[0],1) == -1) )
{
report(stderr, GT_("dup2 failed\n"));
exit(1);
}
/* fds[0] is now connected to 0 and 1; close it */
(void) close(fds[0]);
if (outlevel >= O_VERBOSE)
report(stderr, GT_("running %s (host %s service
%s)\n"), plugin,
host, service);
argvec = parse_plugin(plugin,host,service);
execvp(*argvec, argvec);
report(stderr, GT_("execvp(%s) failed\n"), *argvec);
exit(0);
break;
default: /* parent */
/* NOP */
break;
}
/* fds[0] is the child's end; close it for proper EOF detection */
(void) close(fds[0]);
return fds[1];
}
#endif /* HAVE_SOCKETPAIR */
#ifdef __UNUSED__
#include <sys/time.h
int SockCheckOpen(int fd)
/* poll given socket; is it selectable? */
{
fd_set r, w, e;
int rt;
struct timeval tv;
for (;
{
FD_ZERO(&r); FD_ZERO(&w); FD_ZERO(&e);
FD_SET(fd, &e);
tv.tv_sec = 0; tv.tv_usec = 0;
rt = select(fd+1, &r, &w, &e, &tv);
if (rt == -1 && (errno != EAGAIN && errno != EINTR))
return 0;
if (rt != -1)
return 1;
}
}
#endif /* __UNUSED__ */
int UnixOpen(const char *path)
{
int sock = -1;
struct sockaddr_un ad;
memset(&ad, 0, sizeof(ad));
ad.sun_family = AF_UNIX;
strncpy(ad.sun_path, path, sizeof(ad.sun_path)-1);
sock = socket( AF_UNIX, SOCK_STREAM, 0 );
if (sock < 0)
{
h_errno = 0;
return -1;
}
/* Socket opened saved. Usefull if connect timeout
* because it can be closed.
*/
mailserver_socket_temp = sock;
if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) < 0)
{
int olderr = errno;
fm_close(sock); /* don't use SockClose, no traffic yet */
h_errno = 0;
errno = olderr;
sock = -1;
}
/* No connect timeout, then no need to set
mailserver_socket_temp */
mailserver_socket_temp = -1;
return sock;
}
#if INET6_ENABLE
int SockOpen(const char *host, const char *service, const char
*options,
const char *plugin)
{
struct addrinfo *ai, *ai0, req;
int i;
#if NET_SECURITY
void *request = NULL;
int requestlen;
#endif /* NET_SECURITY */
#ifdef HAVE_SOCKETPAIR
if (plugin)
return handle_plugin(host,service,plugin);
#endif /* HAVE_SOCKETPAIR */
memset(&req, 0, sizeof(struct addrinfo));
req.ai_socktype = SOCK_STREAM;
if (getaddrinfo(host, service, &req, &ai0)) {
report(stderr, GT_("fetchmail: getaddrinfo(%s.%s)\n"),
host,service);
return -1;
}
#if NET_SECURITY
if (!options)
requestlen = 0;
else
if (net_security_strtorequest((char *)options, &request,
&requestlen))
goto ret;
i = inner_connect(ai0, request, requestlen, NULL, NULL,
"fetchmail", NULL);
if (request)
free(request);
ret:
#else /* NET_SECURITY */
#ifdef HAVE_INNER_CONNECT
i = inner_connect(ai0, NULL, 0, NULL, NULL, "fetchmail", NULL);
if (i >= 0)
break;
#else
i = -1;
for (ai = ai0; ai; ai = ai->ai_next) {
i = socket(ai->ai_family, ai->ai_socktype, 0);
if (i < 0)
continue;
/* Socket opened saved. Usefull if connect timeout
* because it can be closed.
*/
mailserver_socket_temp = i;
if (connect(i, (struct sockaddr *) ai->ai_addr, ai->ai_addrlen)
0) {
fm_close(i);
i = -1;
continue;
}
/* No connect timeout, then no need to set
mailserver_socket_temp */
mailserver_socket_temp = -1;
break;
}
#endif
#endif /* NET_SECURITY */
freeaddrinfo(ai0);
return i;
}
#else /* INET6_ENABLE */
#ifndef HAVE_INET_ATON
#ifndef INADDR_NONE
#ifdef INADDR_BROADCAST
#define INADDR_NONE INADDR_BROADCAST
#else
#define INADDR_NONE -1
#endif
#endif
#endif /* HAVE_INET_ATON */
int SockOpen(const char *host, int clientPort, const char *options,
const char *plugin)
{
int sock = -1; /* pacify -Wall */
#ifndef HAVE_INET_ATON
unsigned long inaddr;
#endif /* HAVE_INET_ATON */
struct sockaddr_in ad, **pptr;
struct hostent *hp;
#ifdef HAVE_SOCKETPAIR
if (plugin) {
char buf[10];
#ifdef HAVE_SNPRINTF
snprintf(buf, sizeof(buf), /* Yeah, paranoic. So what?
*/
#else
sprintf(buf,
#endif /* HAVE_SNPRINTF */
"%d",clientPort);
return handle_plugin(host,buf,plugin);
}
#endif /* HAVE_SOCKETPAIR */
memset(&ad, 0, sizeof(ad));
ad.sin_family = AF_INET;
/* we'll accept a quad address */
#ifndef HAVE_INET_ATON
inaddr = inet_addr((char*)host);
if (inaddr != INADDR_NONE)
{
memcpy(&ad.sin_addr, &inaddr, sizeof(inaddr));
#else
if (inet_aton(host, &ad.sin_addr))
{
#endif /* HAVE_INET_ATON */
ad.sin_port = htons(clientPort);
sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0)
{
h_errno = 0;
return -1;
}
/* Socket opened saved. Usefull if connect timeout
because
* it can be closed
*/
mailserver_socket_temp = sock;
if (connect(sock, (struct sockaddr *) &ad, sizeof(ad)) < 0)
{
int olderr = errno;
fm_close(sock); /* don't use SockClose, no traffic yet
*/
h_errno = 0;
errno = olderr;
return -1;
}
/* No connect timeout, then no need to set
mailserver_socket_temp */
mailserver_socket_temp = -1;
#ifndef HAVE_INET_ATON
}
#else
}
#endif /* HAVE_INET_ATON */
else {
hp = gethostbyname((char*)host);
if (hp == NULL)
{
errno = 0;
return -1;
}
/*
* Add a check to make sure the address has a valid IPv4 or
IPv6
* length. This prevents
