* Exim - an Internet mail transport agent *
*************************************************/
-/* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003-2014 */
+/* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2003 - 2015 */
/* License: GPL */
/* Code for calling virus (malware) scanners. Called from acl.c. */
/* The maximum number of clamd servers that are supported in the configuration */
#define MAX_CLAMD_SERVERS 32
#define MAX_CLAMD_SERVERS_S "32"
-/* Maximum length of the hostname that can be specified in the clamd address list */
-#define MAX_CLAMD_ADDRESS_LENGTH 64
-#define MAX_CLAMD_ADDRESS_LENGTH_S "64"
-typedef struct clamd_address_container {
- uschar tcp_addr[MAX_CLAMD_ADDRESS_LENGTH+1];
- unsigned int tcp_port;
-} clamd_address_container;
+typedef struct clamd_address {
+ uschar * hostspec;
+ unsigned tcp_port;
+ unsigned retry;
+} clamd_address;
#ifndef nelements
# define nelements(arr) (sizeof(arr) / sizeof(arr[0]))
static inline int
malware_errlog_defer(const uschar * str)
{
- log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str);
- return DEFER;
+log_write(0, LOG_MAIN|LOG_PANIC, "malware acl condition: %s", str);
+return DEFER;
}
static int
m_errlog_defer(struct scan * scanent, const uschar * str)
{
- return malware_errlog_defer(string_sprintf("%s: %s", scanent->name, str));
+return malware_errlog_defer(string_sprintf("%s: %s", scanent->name, str));
}
static int
m_errlog_defer_3(struct scan * scanent, const uschar * str,
int fd_to_close)
{
- (void) close(fd_to_close);
- return m_errlog_defer(scanent, str);
+(void) close(fd_to_close);
+return m_errlog_defer(scanent, str);
}
/*************************************************/
m_tcpsocket(const uschar * hostname, unsigned int port,
host_item * host, uschar ** errstr)
{
- return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5, host, errstr);
-}
-
-static int
-m_tcpsocket_fromdef(const uschar * hostport, uschar ** errstr)
-{
- int scan;
- uschar hostname[256];
- unsigned int portlow, porthigh;
-
- /* extract host and port part */
- scan = sscanf(CS hostport, "%255s %u-%u", hostname, &portlow, &porthigh);
- if ( scan != 3 ) {
- if ( scan != 2 ) {
- *errstr = string_sprintf("invalid socket '%s'", hostport);
- return -1;
- }
- porthigh = portlow;
- }
-
- return ip_connectedsocket(SOCK_STREAM, hostname, portlow, porthigh,
- 5, NULL, errstr);
-}
-
-static int
-m_unixsocket(const uschar * path, uschar ** errstr)
-{
- int sock;
- struct sockaddr_un server;
-
- if ((sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
- *errstr = US"can't open UNIX socket.";
- return -1;
- }
-
- server.sun_family = AF_UNIX;
- Ustrncpy(server.sun_path, path, sizeof(server.sun_path)-1);
- server.sun_path[sizeof(server.sun_path)-1] = '\0';
- if (connect(sock, (struct sockaddr *) &server, sizeof(server)) < 0) {
- int err = errno;
- (void)close(sock);
- *errstr = string_sprintf("unable to connect to UNIX socket (%s): %s",
- path, strerror(err));
- return -1;
- }
- return sock;
-}
-
-static inline int
-m_streamsocket(const uschar * spec, uschar ** errstr)
-{
- return *spec == '/'
- ? m_unixsocket(spec, errstr) : m_tcpsocket_fromdef(spec, errstr);
+return ip_connectedsocket(SOCK_STREAM, hostname, port, port, 5, host, errstr);
}
static int
m_sock_send(int sock, uschar * buf, int cnt, uschar ** errstr)
{
- if (send(sock, buf, cnt, 0) < 0) {
- int err = errno;
- (void)close(sock);
- *errstr = string_sprintf("unable to send to socket (%s): %s",
- buf, strerror(err));
- return -1;
- }
- return sock;
+if (send(sock, buf, cnt, 0) < 0)
+ {
+ int err = errno;
+ (void)close(sock);
+ *errstr = string_sprintf("unable to send to socket (%s): %s",
+ buf, strerror(err));
+ return -1;
+ }
+return sock;
}
static const pcre *
m_pcre_compile(const uschar * re, uschar ** errstr)
{
- const uschar * rerror;
- int roffset;
- const pcre * cre;
-
- cre = pcre_compile(CS re, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
- if (!cre)
- *errstr= string_sprintf("regular expression error in '%s': %s at offset %d",
- re, rerror, roffset);
- return cre;
+const uschar * rerror;
+int roffset;
+const pcre * cre;
+
+cre = pcre_compile(CS re, PCRE_COPT, (const char **)&rerror, &roffset, NULL);
+if (!cre)
+ *errstr= string_sprintf("regular expression error in '%s': %s at offset %d",
+ re, rerror, roffset);
+return cre;
}
uschar *
m_pcre_exec(const pcre * cre, uschar * text)
{
- int ovector[10*3];
- int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0,
- ovector, nelements(ovector));
- uschar * substr = NULL;
- if (i >= 2) /* Got it */
- pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr);
- return substr;
+int ovector[10*3];
+int i = pcre_exec(cre, NULL, CS text, Ustrlen(text), 0, 0,
+ ovector, nelements(ovector));
+uschar * substr = NULL;
+if (i >= 2) /* Got it */
+ pcre_get_substring(CS text, ovector, i, 1, (const char **) &substr);
+return substr;
}
static const pcre *
-m_pcre_nextinlist(uschar ** list, int * sep, char * listerr, uschar ** errstr)
+m_pcre_nextinlist(const uschar ** list, int * sep,
+ char * listerr, uschar ** errstr)
{
- const uschar * list_ele;
- const pcre * cre = NULL;
+const uschar * list_ele;
+const pcre * cre = NULL;
- if (!(list_ele = string_nextinlist(list, sep, NULL, 0)))
- *errstr = US listerr;
- else
- cre = m_pcre_compile(CUS list_ele, errstr);
- return cre;
+if (!(list_ele = string_nextinlist(list, sep, NULL, 0)))
+ *errstr = US listerr;
+else
+ cre = m_pcre_compile(CUS list_ele, errstr);
+return cre;
}
/*
return mksd_parse_line (scanent, CS av_buffer);
}
+
+static int
+clamd_option(clamd_address * cd, const uschar * optstr, int * subsep)
+{
+uschar * s;
+
+cd->retry = 0;
+while ((s = string_nextinlist(&optstr, subsep, NULL, 0)))
+ if (Ustrncmp(s, "retry=", 6) == 0)
+ {
+ int sec = readconf_readtime((s += 6), '\0', FALSE);
+ if (sec < 0)
+ return FAIL;
+ cd->retry = sec;
+ }
+ else
+ return FAIL;
+return OK;
+}
+
/*************************************************
* Scan content for malware *
*************************************************/
int timeout, BOOL faking)
{
int sep = 0;
-uschar *av_scanner_work = av_scanner;
+const uschar *av_scanner_work = av_scanner;
uschar *scanner_name;
unsigned long mbox_size;
FILE *mbox_file;
if (!timeout) timeout = MALWARE_TIMEOUT;
tmo = time(NULL) + timeout;
- for (scanent = m_scans; ; scanent++) {
+ for (scanent = m_scans; ; scanent++)
+ {
if (!scanent->name)
return malware_errlog_defer(string_sprintf("unknown scanner type '%s'",
scanner_name));
break;
switch(scanent->conn)
{
- case MC_TCP: sock = m_tcpsocket_fromdef(scanner_options, &errstr); break;
- case MC_UNIX: sock = m_unixsocket(scanner_options, &errstr); break;
- case MC_STRM: sock = m_streamsocket(scanner_options, &errstr); break;
+ case MC_TCP: sock = ip_tcpsocket(scanner_options, &errstr, 5); break;
+ case MC_UNIX: sock = ip_unixsocket(scanner_options, &errstr); break;
+ case MC_STRM: sock = ip_streamsocket(scanner_options, &errstr, 5); break;
default: /* compiler quietening */ break;
}
if (sock < 0)
string_sprintf("unable to read result (%s)", strerror(errno)),
sock);
- for (p[bread] = '\0'; q = strchr(p, '\n'); p = q+1)
+ for (p[bread] = '\0'; q = Ustrchr(p, '\n'); p = q+1)
{
*q = '\0';
sizeof(linebuffer), tmo)))
{
if (rcnt < 0)
+ {
+ int err = errno;
if (rcnt == -1)
break;
- else
- {
- int err = errno;
- (void) pclose(scanner_out);
- signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
- return m_errlog_defer(scanent, string_sprintf(
- "unable to read from scanner (%s): %s",
- commandline, strerror(err)));
- }
+ (void) pclose(scanner_out);
+ signal(SIGCHLD,eximsigchld); signal(SIGPIPE,eximsigpipe);
+ return m_errlog_defer(scanent, string_sprintf(
+ "unable to read from scanner (%s): %s",
+ commandline, strerror(err)));
+ }
if (Ustrlen(linebuffer) > fwrite(linebuffer, 1, Ustrlen(linebuffer), scanner_record))
{
off_t fsize;
unsigned int fsize_uint;
BOOL use_scan_command = FALSE;
- clamd_address_container * clamd_address_vector[MAX_CLAMD_SERVERS];
- int current_server;
+ clamd_address * cv[MAX_CLAMD_SERVERS];
int num_servers = 0;
#ifdef WITH_OLD_CLAMAV_STREAM
unsigned int port;
uint32_t send_size, send_final_zeroblock;
#endif
+ /*XXX if unixdomain socket, only one server supported. Needs fixing;
+ there's no reason we should not mix local and remote servers */
+
if (*scanner_options == '/')
+ {
+ clamd_address * cd;
+ const uschar * sublist;
+ int subsep = ' ';
+
/* Local file; so we def want to use_scan_command and don't want to try
* passing IP/port combinations */
use_scan_command = TRUE;
+ cd = (clamd_address *) store_get(sizeof(clamd_address));
+
+ /* extract socket-path part */
+ sublist = scanner_options;
+ cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0);
+
+ /* parse options */
+ if (clamd_option(cd, sublist, &subsep) != OK)
+ return m_errlog_defer(scanent,
+ string_sprintf("bad option '%s'", scanner_options));
+ cv[0] = cd;
+ }
else
{
- const uschar *address = scanner_options;
- uschar address_buffer[MAX_CLAMD_ADDRESS_LENGTH + 20];
-
/* Go through the rest of the list of host/port and construct an array
* of servers to try. The first one is the bit we just passed from
* scanner_options so process that first and then scan the remainder of
* the address buffer */
do
{
- clamd_address_container *this_clamd;
+ clamd_address * cd;
+ const uschar * sublist;
+ int subsep = ' ';
+ uschar * s;
/* The 'local' option means use the SCAN command over the network
* socket (ie common file storage in use) */
- if (strcmpic(address,US"local") == 0)
+ /*XXX we could accept this also as a local option? */
+ if (strcmpic(scanner_options, US"local") == 0)
{
use_scan_command = TRUE;
continue;
}
- /* XXX: If unsuccessful we should free this memory */
- this_clamd =
- (clamd_address_container *)store_get(sizeof(clamd_address_container));
+ cd = (clamd_address *) store_get(sizeof(clamd_address));
/* extract host and port part */
- if( sscanf(CS address, "%" MAX_CLAMD_ADDRESS_LENGTH_S "s %u",
- this_clamd->tcp_addr, &(this_clamd->tcp_port)) != 2 )
+ sublist = scanner_options;
+ if (!(cd->hostspec = string_nextinlist(&sublist, &subsep, NULL, 0)))
{
(void) m_errlog_defer(scanent,
- string_sprintf("invalid address '%s'", address));
+ string_sprintf("missing address: '%s'", scanner_options));
continue;
}
+ if (!(s = string_nextinlist(&sublist, &subsep, NULL, 0)))
+ {
+ (void) m_errlog_defer(scanent,
+ string_sprintf("missing port: '%s'", scanner_options));
+ continue;
+ }
+ cd->tcp_port = atoi(CS s);
- clamd_address_vector[num_servers] = this_clamd;
- num_servers++;
+ /* parse options */
+ /*XXX should these options be common over scanner types? */
+ if (clamd_option(cd, sublist, &subsep) != OK)
+ {
+ return m_errlog_defer(scanent,
+ string_sprintf("bad option '%s'", scanner_options));
+ continue;
+ }
+
+ cv[num_servers++] = cd;
if (num_servers >= MAX_CLAMD_SERVERS)
{
(void) m_errlog_defer(scanent,
"specified; only using the first " MAX_CLAMD_SERVERS_S );
break;
}
- } while ((address = string_nextinlist(&av_scanner_work, &sep,
- address_buffer,
- sizeof(address_buffer))) != NULL);
+ } while ((scanner_options = string_nextinlist(&av_scanner_work, &sep,
+ NULL, 0)));
/* check if we have at least one server */
if (!num_servers)
while (num_servers > 0)
{
- int i;
- /* Randomly pick a server to start with */
- current_server = random_number( num_servers );
+ int i = random_number( num_servers );
+ clamd_address * cd = cv[i];
- DEBUG(D_acl)
- debug_printf("trying server name %s, port %u\n",
- clamd_address_vector[current_server]->tcp_addr,
- clamd_address_vector[current_server]->tcp_port);
+ DEBUG(D_acl) debug_printf("trying server name %s, port %u\n",
+ cd->hostspec, cd->tcp_port);
/* Lookup the host. This is to ensure that we connect to the same IP
* on both connections (as one host could resolve to multiple ips) */
- sock= m_tcpsocket(clamd_address_vector[current_server]->tcp_addr,
- clamd_address_vector[current_server]->tcp_port,
- &connhost, &errstr);
- if (sock >= 0)
+ for (;;)
{
- /* Connection successfully established with a server */
- hostname = clamd_address_vector[current_server]->tcp_addr;
- break;
+ sock= m_tcpsocket(cd->hostspec, cd->tcp_port, &connhost, &errstr);
+ if (sock >= 0)
+ {
+ /* Connection successfully established with a server */
+ hostname = cd->hostspec;
+ break;
+ }
+ if (cd->retry <= 0) break;
+ while (cd->retry > 0) cd->retry = sleep(cd->retry);
}
+ if (sock >= 0)
+ break;
- (void) m_errlog_defer(scanent, errstr);
+ log_write(0, LOG_MAIN, "malware acl condition: %s: %s",
+ scanent->name, errstr);
/* Remove the server from the list. XXX We should free the memory */
num_servers--;
- for (i = current_server; i < num_servers; i++)
- clamd_address_vector[i] = clamd_address_vector[i+1];
+ for (; i < num_servers; i++)
+ cv[i] = cv[i+1];
}
if (num_servers == 0)
return m_errlog_defer(scanent, US"all servers failed");
}
else
- {
- if ((sock = m_unixsocket(scanner_options, &errstr)) < 0)
- return m_errlog_defer(scanent, errstr);
- }
+ for (;;)
+ {
+ if ((sock = ip_unixsocket(cv[0]->hostspec, &errstr)) >= 0)
+ {
+ hostname = cv[0]->hostspec;
+ break;
+ }
+ if (cv[0]->retry <= 0)
+ return m_errlog_defer(scanent, errstr);
+ while (cv[0]->retry > 0) cv[0]->retry = sleep(cv[0]->retry);
+ }
/* have socket in variable "sock"; command to use is semi-independent of
* the socket protocol. We use SCAN if is local (either Unix/local
string_sprintf("invalid option '%s'", scanner_options));
}
- if((sock = m_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0)
+ if((sock = ip_unixsocket(US "/var/run/mksd/socket", &errstr)) < 0)
return m_errlog_defer(scanent, errstr);
malware_name = NULL;
git://git.exim.org / exim.git / blobdiff