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-rw-r--r--common/smtppass.c1325
1 files changed, 687 insertions, 638 deletions
diff --git a/common/smtppass.c b/common/smtppass.c
index d2c5f9c..2e590f6 100644
--- a/common/smtppass.c
+++ b/common/smtppass.c
@@ -36,6 +36,7 @@
* Andreas Steinmetz <ast@domdv.de>
*/
+/* TODO: Remove unneeded headers */
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
@@ -50,6 +51,8 @@
#include <signal.h>
#include <errno.h>
#include <err.h>
+#include <paths.h>
+#include <stdarg.h>
#include "usuals.h"
@@ -59,19 +62,19 @@
#include "compat.h"
#include "sock_any.h"
-#include "smtppass.h"
-#include "util.h"
+#include "stringx.h"
+#include "sppriv.h"
/* -----------------------------------------------------------------------
* STRUCTURES
*/
-typedef struct smtppass_thread
+typedef struct spthread
{
pthread_t tid; /* Written to by the main thread */
int fd; /* The file descriptor or -1 */
}
-smtppass_thread_t;
+spthread_t;
/* -----------------------------------------------------------------------
* STRINGS
@@ -82,17 +85,16 @@ smtppass_thread_t;
#define SMTP_TOOLONG "500 Line too long" CRLF
#define SMTP_STARTBUSY "554 Server Busy" CRLF
#define SMTP_STARTFAILED "554 Local Error" CRLF
-#define SMTP_DATAVIRUS "550 Virus Detected; Content Rejected" CRLF
#define SMTP_DATAINTERMED "354 Start mail input; end with <CRLF>.<CRLF>" CRLF
#define SMTP_FAILED "451 Local Error" CRLF
#define SMTP_NOTSUPP "502 Command not implemented" CRLF
-#define SMTP_DATAVIRUSOK "250 Virus Detected; Discarded Email" CRLF
#define SMTP_OK "250 Ok" CRLF
+#define SMTP_REJPREFIX "550 Content Rejected; "
#define SMTP_DATA "DATA" CRLF
-#define SMTP_BANNER "220 clamsmtp" CRLF
-#define SMTP_HELO_RSP "250 clamsmtp" CRLF
-#define SMTP_EHLO_RSP "250-clamsmtp" CRLF
+#define SMTP_BANNER "220 smtp.passthru" CRLF
+#define SMTP_HELO_RSP "250 smtp.passthru" CRLF
+#define SMTP_EHLO_RSP "250-smtp.passthru" CRLF
#define SMTP_DELIMS "\r\n\t :"
#define SMTP_MULTI_DELIMS " -"
@@ -117,227 +119,165 @@ smtppass_thread_t;
#define OK_RSP "250"
#define START_RSP "220"
+#define CFG_MAXTHREADS "MaxConnections"
+#define CFG_TIMEOUT "TimeOut"
+#define CFG_OUTADDR "OutAddress"
+#define CFG_LISTENADDR "Listen"
+#define CFG_TRANSPARENT "TransparentProxy"
+#define CFG_DIRECTORY "TempDirectory"
+
+/* The set of delimiters that can be present between config and value */
+#define CFG_DELIMS ": \t"
+
+
+#define LINE_TOO_LONG(ctx) ((ctx)->linelen >= (SP_LINE_LENGTH - 2))
+
+/* -----------------------------------------------------------------------
+ * DEFAULT SETTINGS
+ */
+
+#define DEFAULT_SOCKET "10025"
+#define DEFAULT_PORT 10025
+#define DEFAULT_MAXTHREADS 64
+#define DEFAULT_TIMEOUT 180
/* -----------------------------------------------------------------------
* GLOBALS
*/
-const clstate_t* g_state = NULL; /* The state and configuration of the daemon */
+spstate_t g_state; /* The state and configuration of the daemon */
unsigned int g_unique_id = 0x00100000; /* For connection ids */
+pthread_mutex_t g_mutex; /* The main mutex */
+pthread_mutexattr_t g_mtxattr;
/* -----------------------------------------------------------------------
* FORWARD DECLARATIONS
*/
-static void usage();
static void on_quit(int signal);
static void pid_file(const char* pidfile, int write);
static void connection_loop(int sock);
static void* thread_main(void* arg);
-static int smtp_passthru(clamsmtp_context_t* ctx);
-static int connect_out(clamsmtp_context_t* ctx);
-static int connect_clam(clamsmtp_context_t* ctx);
-static int disconnect_clam(clamsmtp_context_t* ctx);
-static void add_to_logline(char* logline, char* prefix, char* line);
-static int avcheck_data(clamsmtp_context_t* ctx, char* logline);
-static int quarantine_virus(clamsmtp_context_t* ctx, char* tempname);
-static int complete_data_transfer(clamsmtp_context_t* ctx, const char* tempname);
-static int transfer_to_file(clamsmtp_context_t* ctx, char* tempname);
-static int transfer_from_file(clamsmtp_context_t* ctx, const char* filename);
-static int clam_scan_file(clamsmtp_context_t* ctx, const char* tempname, char* logline);
-static int read_server_response(clamsmtp_context_t* ctx);
-static void read_junk(clamsmtp_context_t* ctx, int fd);
+static int smtp_passthru(spctx_t* ctx);
+static int connect_out(spctx_t* ctx);
+static int read_server_response(spctx_t* ctx);
+static int parse_config_file(const char* configfile);
+/* Used externally in some cases */
+int sp_parse_option(const char* name, const char* option);
/* ----------------------------------------------------------------------------------
- * STARTUP ETC...
+ * BASIC RUN FUNCTIONALITY
*/
-int main(int argc, char* argv[])
+void sp_init(const char* name)
{
- const char* configfile = DEFAULT_CONFIG;
- const char* pidfile = NULL;
- clstate_t state;
- int warnargs = 0;
- int sock;
- int true = 1;
- int ch = 0;
- char* t;
+ int r;
- clstate_init(&state);
- g_state = &state;
+ ASSERT(name);
- /* Parse the arguments nicely */
- while((ch = getopt(argc, argv, "bc:d:D:f:h:l:m:p:qt:v")) != -1)
- {
- switch(ch)
- {
- /* Actively reject messages */
- case 'b':
- state.bounce = 1;
- warnargs = 1;
- break;
-
- /* Change the CLAM socket */
- case 'c':
- state.clamname = optarg;
- warnargs = 1;
- break;
-
- /* Don't daemonize */
- case 'd':
- state.debug_level = strtol(optarg, &t, 10);
- if(*t) /* parse error */
- errx(1, "invalid debug log level");
- state.debug_level += LOG_ERR;
- break;
-
- /* The directory for the files */
- case 'D':
- state.directory = optarg;
- warnargs = 1;
- break;
-
- /* The configuration file */
- case 'f':
- configfile = optarg;
- break;
-
- /* The header to add */
- case 'h':
- if(strlen(optarg) == 0)
- state.header = NULL;
- else
- state.header = optarg;
- warnargs = 1;
- break;
-
- /* Change our listening port */
- case 'l':
- state.listenname = optarg;
- warnargs = 1;
- break;
-
- /* The maximum number of threads */
- case 'm':
- state.max_threads = strtol(optarg, &t, 10);
- if(*t) /* parse error */
- errx(1, "invalid max threads");
- warnargs = 1;
- break;
-
- /* Write out a pid file */
- case 'p':
- pidfile = optarg;
- break;
-
- /* The timeout */
- case 't':
- state.timeout.tv_sec = strtol(optarg, &t, 10);
- if(*t) /* parse error */
- errx(1, "invalid timeout");
- warnargs = 1;
- break;
-
- /* Leave virus files in directory */
- case 'q':
- state.quarantine = 1;
- break;
-
- /* Print version number */
- case 'v':
- printf("clamsmtpd (version %s)\n", VERSION);
- exit(0);
- break;
-
- /* Leave all files in the tmp directory */
- case 'X':
- state.debug_files = 1;
- warnargs = 1;
- break;
-
- /* Usage information */
- case '?':
- default:
- usage();
- break;
- }
- }
+ memset(&g_state, 0, sizeof(g_state));
- argc -= optind;
- argv += optind;
+ /* Setup the defaults */
+ g_state.debug_level = -1;
+ g_state.max_threads = DEFAULT_MAXTHREADS;
+ g_state.timeout.tv_sec = DEFAULT_TIMEOUT;
+ g_state.directory = _PATH_TMP;
+ g_state.name = name;
- if(argc > 1)
- usage();
- if(argc == 1)
- {
- state.outname = argv[0];
- warnargs = 1;
- }
+ /* We need the default to parse into a useable form, so we do this: */
+ r = sp_parse_option(CFG_LISTENADDR, DEFAULT_SOCKET);
+ ASSERT(r == 1);
+
+ /* Create the main mutex and condition variable */
+ if(pthread_mutexattr_init(&g_mtxattr) != 0 ||
+#ifdef HAVE_ERR_MUTEX
+ pthread_mutexattr_settype(&g_mtxattr, MUTEX_TYPE) ||
+#endif
+ pthread_mutex_init(&g_mutex, &g_mtxattr) != 0)
+ errx(1, "threading problem. can't create mutex or condition var");
+}
+
+int sp_run(const char* configfile, const char* pidfile, int dbg_level)
+{
+ int sock;
+ int true = 1;
- if(warnargs)
- warnx("please use configuration file instead of command-line flags: %s", configfile);
+ ASSERT(configfile);
+ ASSERT(g_state.name);
+
+ if(!(dbg_level == -1 || dbg_level <= LOG_DEBUG))
+ errx(2, "invalid debug log level (must be between 1 and 4)");
+ g_state.debug_level = dbg_level;
/* Now parse the configuration file */
- if(clstate_parse_config(&state, configfile) == -1)
+ if(parse_config_file(configfile) == -1)
{
- /* Only error when it was forced */
- if(configfile != DEFAULT_CONFIG)
- err(1, "couldn't open config file: %s", configfile);
- else
- warnx("default configuration file not found: %s", configfile);
+ /*
+ * We used to do a check here before whether it was the default
+ * configuration file or not, but we can't do that any longer
+ * as it comes from the app. Usually lack of a configuration
+ * file will cause the following checks to fail
+ */
+ warnx("configuration file not found: %s", configfile);
}
- clstate_validate(&state);
+ /* This option has no default, but is required ... */
+ if(g_state.outname == NULL && !g_state.transparent)
+ errx(2, "no " CFG_OUTADDR " specified.");
- messagex(NULL, LOG_DEBUG, "starting up...");
+ /* ... unless we're in transparent proxy mode */
+ else if(g_state.outname != NULL && g_state.transparent)
+ warnx("the " CFG_OUTADDR " option will be ignored when " CFG_TRANSPARENT " is enabled");
+
+ sp_messagex(NULL, LOG_DEBUG, "starting up...");
/* When set to this we daemonize */
- if(g_state->debug_level == -1)
+ if(g_state.debug_level == -1)
{
/* Fork a daemon nicely here */
if(daemon(0, 0) == -1)
{
- message(NULL, LOG_ERR, "couldn't run as daemon");
+ sp_message(NULL, LOG_ERR, "couldn't run as daemon");
exit(1);
}
- messagex(NULL, LOG_DEBUG, "running as a daemon");
- state.daemonized = 1;
+ sp_messagex(NULL, LOG_DEBUG, "running as a daemon");
+ g_state.daemonized = 1;
/* Open the system log */
- openlog("clamsmtpd", 0, LOG_MAIL);
+ openlog(g_state.name, 0, LOG_MAIL);
}
/* Create the socket */
- sock = socket(SANY_TYPE(g_state->listenaddr), SOCK_STREAM, 0);
+ sock = socket(SANY_TYPE(g_state.listenaddr), SOCK_STREAM, 0);
if(sock < 0)
{
- message(NULL, LOG_CRIT, "couldn't open socket");
+ sp_message(NULL, LOG_CRIT, "couldn't open socket");
exit(1);
}
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (void *)&true, sizeof(true));
/* Unlink the socket file if it exists */
- if(SANY_TYPE(g_state->listenaddr) == AF_UNIX)
- unlink(g_state->listenname);
+ if(SANY_TYPE(g_state.listenaddr) == AF_UNIX)
+ unlink(g_state.listenname);
- if(bind(sock, &SANY_ADDR(g_state->listenaddr), SANY_LEN(g_state->listenaddr)) != 0)
+ if(bind(sock, &SANY_ADDR(g_state.listenaddr), SANY_LEN(g_state.listenaddr)) != 0)
{
- message(NULL, LOG_CRIT, "couldn't bind to address: %s", g_state->listenname);
+ sp_message(NULL, LOG_CRIT, "couldn't bind to address: %s", g_state.listenname);
exit(1);
}
/* Let 5 connections queue up */
if(listen(sock, 5) != 0)
{
- message(NULL, LOG_CRIT, "couldn't listen on socket");
+ sp_message(NULL, LOG_CRIT, "couldn't listen on socket");
exit(1);
}
- messagex(NULL, LOG_DEBUG, "created socket: %s", g_state->listenname);
+ sp_messagex(NULL, LOG_DEBUG, "created socket: %s", g_state.listenname);
/* Handle some signals */
signal(SIGPIPE, SIG_IGN);
@@ -351,34 +291,46 @@ int main(int argc, char* argv[])
if(pidfile)
pid_file(pidfile, 1);
- messagex(NULL, LOG_DEBUG, "accepting connections");
+ sp_messagex(NULL, LOG_DEBUG, "accepting connections");
connection_loop(sock);
if(pidfile)
pid_file(pidfile, 0);
- messagex(NULL, LOG_DEBUG, "stopped");
+ /* Our listen socket */
+ close(sock);
- /*
- * We have to do this at the very end because even printing
- * messages requires that g_state is valid.
- */
- clstate_cleanup(&state);
+ sp_messagex(NULL, LOG_DEBUG, "stopped processing");
return 0;
}
-static void on_quit(int signal)
+void sp_quit()
+{
+ /* The handler sets the flag and this also interrupts io */
+ kill(getpid(), SIGTERM);
+}
+
+int sp_is_quit()
+{
+ return g_state.quit ? 1 : 0;
+}
+
+void sp_done()
{
- ((clstate_t*)g_state)->quit = 1;
- /* fprintf(stderr, "clamsmtpd: got signal to quit\n"); */
+ /* Close the mutex */
+ pthread_mutex_destroy(&g_mutex);
+ pthread_mutexattr_destroy(&g_mtxattr);
+
+ if(g_state._p)
+ free(g_state._p);
+
+ memset(&g_state, 0, sizeof(g_state));
}
-static void usage()
+static void on_quit(int signal)
{
- fprintf(stderr, "usage: clamsmtpd [-d debuglevel] [-f configfile] [-p pidfile]\n");
- fprintf(stderr, " clamsmtpd -v\n");
- exit(2);
+ g_state.quit = 1;
}
static void pid_file(const char* pidfile, int write)
@@ -388,45 +340,44 @@ static void pid_file(const char* pidfile, int write)
FILE* f = fopen(pidfile, "w");
if(f == NULL)
{
- message(NULL, LOG_ERR, "couldn't open pid file: %s", pidfile);
+ sp_message(NULL, LOG_ERR, "couldn't open pid file: %s", pidfile);
}
else
{
fprintf(f, "%d\n", (int)getpid());
if(ferror(f))
- message(NULL, LOG_ERR, "couldn't write to pid file: %s", pidfile);
+ sp_message(NULL, LOG_ERR, "couldn't write to pid file: %s", pidfile);
+ if(fclose(f) == EOF)
+ sp_message(NULL, LOG_ERR, "couldn't write to pid file: %s", pidfile);
- fclose(f);
}
- messagex(NULL, LOG_DEBUG, "wrote pid file: %s", pidfile);
+ sp_messagex(NULL, LOG_DEBUG, "wrote pid file: %s", pidfile);
}
else
{
unlink(pidfile);
- messagex(NULL, LOG_DEBUG, "removed pid file: %s", pidfile);
+ sp_messagex(NULL, LOG_DEBUG, "removed pid file: %s", pidfile);
}
}
-
-/* ----------------------------------------------------------------------------------
- * CONNECTION HANDLING
- */
-
static void connection_loop(int sock)
{
- clamsmtp_thread_t* threads = NULL;
+ spthread_t* threads = NULL;
int fd, i, x, r;
/* Create the thread buffers */
- threads = (clamsmtp_thread_t*)calloc(g_state->max_threads, sizeof(clamsmtp_thread_t));
+ threads = (spthread_t*)calloc(g_state.max_threads, sizeof(spthread_t));
if(!threads)
- errx(1, "out of memory");
+ {
+ sp_messagex(NULL, LOG_CRIT, "out of memory");
+ return;
+ }
/* Now loop and accept the connections */
- while(!g_state->quit)
+ while(!sp_is_quit())
{
fd = accept(sock, NULL, NULL);
if(fd == -1)
@@ -438,39 +389,38 @@ static void connection_loop(int sock)
break;
case ECONNABORTED:
- message(NULL, LOG_ERR, "couldn't accept a connection");
+ sp_message(NULL, LOG_ERR, "couldn't accept a connection");
break;
default:
- message(NULL, LOG_ERR, "couldn't accept a connection");
- ((clstate_t*)g_state)->quit = 1;
+ sp_message(NULL, LOG_ERR, "couldn't accept a connection");
break;
};
- if(g_state->quit)
+ if(sp_is_quit())
break;
continue;
}
/* Set timeouts on client */
- if(setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &(g_state->timeout), sizeof(g_state->timeout)) < 0 ||
- setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &(g_state->timeout), sizeof(g_state->timeout)) < 0)
- message(NULL, LOG_WARNING, "couldn't set timeouts on incoming connection");
+ if(setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, &(g_state.timeout), sizeof(g_state.timeout)) < 0 ||
+ setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO, &(g_state.timeout), sizeof(g_state.timeout)) < 0)
+ sp_message(NULL, LOG_WARNING, "couldn't set timeouts on incoming connection");
/* Look for thread and also clean up others */
- for(i = 0; i < g_state->max_threads; i++)
+ for(i = 0; i < g_state.max_threads; i++)
{
/* Find a thread to run or clean up old threads */
if(threads[i].tid != 0)
{
- plock();
+ sp_lock();
x = threads[i].fd;
- punlock();
+ sp_unlock();
if(x == -1)
{
- messagex(NULL, LOG_DEBUG, "cleaning up completed thread");
+ sp_messagex(NULL, LOG_DEBUG, "cleaning up completed thread");
pthread_join(threads[i].tid, NULL);
threads[i].tid = 0;
}
@@ -478,7 +428,7 @@ static void connection_loop(int sock)
else
{
/* For debugging connection problems: */
- messagex(NULL, LOG_DEBUG, "active connection thread: %x", (int)threads[i].tid);
+ sp_messagex(NULL, LOG_DEBUG, "active connection thread: %x", (int)threads[i].tid);
}
#endif
}
@@ -492,12 +442,16 @@ static void connection_loop(int sock)
if(r != 0)
{
errno = r;
- message(NULL, LOG_ERR, "couldn't create thread");
- ((clstate_t*)g_state)->quit = 1;
+ sp_message(NULL, LOG_ERR, "couldn't create thread");
+
+ write(fd, SMTP_STARTFAILED, KL(SMTP_STARTFAILED));
+ shutdown(fd, SHUT_RDWR);
+ close(fd);
+ fd = -1;
break;
}
- messagex(NULL, LOG_DEBUG, "created thread for connection");
+ sp_messagex(NULL, LOG_DEBUG, "created thread for connection");
fd = -1;
break;
}
@@ -506,8 +460,7 @@ static void connection_loop(int sock)
/* Check to make sure we have a thread */
if(fd != -1)
{
- messagex(NULL, LOG_ERR, "too many connections open (max %d). sent 554 response", g_state->max_threads);
-
+ sp_messagex(NULL, LOG_ERR, "too many connections open (max %d). sent 554 response", g_state.max_threads);
write(fd, SMTP_STARTBUSY, KL(SMTP_STARTBUSY));
shutdown(fd, SHUT_RDWR);
close(fd);
@@ -515,34 +468,105 @@ static void connection_loop(int sock)
}
}
- messagex(NULL, LOG_DEBUG, "waiting for threads to quit");
+ sp_messagex(NULL, LOG_DEBUG, "waiting for threads to quit");
/* Quit all threads here */
- for(i = 0; i < g_state->max_threads; i++)
+ for(i = 0; i < g_state.max_threads; i++)
{
/* Clean up quit threads */
if(threads[i].tid != 0)
{
if(threads[i].fd != -1)
{
- plock();
+ sp_lock();
fd = threads[i].fd;
threads[i].fd = -1;
- punlock();
+ sp_unlock();
shutdown(fd, SHUT_RDWR);
close(fd);
}
pthread_join(threads[i].tid, NULL);
+ threads[i].tid = 0;
+ }
+ }
+
+ free(threads);
+}
+
+static spctx_t* init_thread(int fd)
+{
+ spctx_t* ctx;
+
+ ctx = cb_new_context();
+ if(ctx)
+ {
+ memset(ctx, 0, sizeof(*ctx));
+
+ spio_init(&(ctx->server), "SERVER");
+ spio_init(&(ctx->client), "CLIENT");
+
+ sp_lock();
+ /* Assign a unique id to the connection */
+ ctx->id = g_unique_id++;
+
+ /* We don't care about wraps, but we don't want zero */
+ if(g_unique_id == 0)
+ g_unique_id++;
+ sp_unlock();
+
+ ctx->client.fd = fd;
+ ASSERT(ctx->client.fd != -1);
+ sp_messagex(ctx, LOG_DEBUG, "processing %d on thread %x", ctx->client.fd, (int)pthread_self());
+
+ /* Connect to the outgoing server ... */
+ if(connect_out(ctx) == -1)
+ {
+ cb_del_context(ctx);
+ ctx = NULL;
}
}
+
+ return ctx;
+}
+
+static void cleanup_context(spctx_t* ctx)
+{
+ ASSERT(ctx);
+
+ if(ctx->cachefile)
+ {
+ fclose(ctx->cachefile);
+ ctx->cachefile = NULL;
+ }
+
+ if(ctx->cachename[0])
+ {
+ unlink(ctx->cachename);
+ ctx->cachename[0] = 0;
+ }
+
+ ctx->logline[0] = 0;
+}
+
+
+static void done_thread(spctx_t* ctx)
+{
+ ASSERT(ctx);
+
+ spio_disconnect(ctx, &(ctx->client));
+ spio_disconnect(ctx, &(ctx->server));
+
+ /* Clean up file stuff */
+ cleanup_context(ctx);
+ cb_del_context(ctx);
}
static void* thread_main(void* arg)
{
- clamsmtp_thread_t* thread = (clamsmtp_thread_t*)arg;
- clamsmtp_context_t* ctx = NULL;
+ spthread_t* thread = (spthread_t*)arg;
+ spctx_t* ctx = NULL;
int processing = 0;
int ret = 0;
int fd;
@@ -552,48 +576,21 @@ static void* thread_main(void* arg)
siginterrupt(SIGINT, 1);
siginterrupt(SIGTERM, 1);
- plock();
+ sp_lock();
/* Get the client socket */
fd = thread->fd;
- punlock();
+ sp_unlock();
- ctx = (clamsmtp_context_t*)calloc(1, sizeof(clamsmtp_context_t));
+ ctx = init_thread(fd);
if(!ctx)
{
/* Special case. We don't have a context so clean up descriptor */
close(fd);
- messagex(NULL, LOG_CRIT, "out of memory");
+ /* new_context() should have already logged reason */
RETURN(-1);
}
- memset(ctx, 0, sizeof(*ctx));
-
- clio_init(&(ctx->server), "SERVER");
- clio_init(&(ctx->client), "CLIENT");
- clio_init(&(ctx->clam), "CLAM ");
-
- plock();
- /* Assign a unique id to the connection */
- ctx->id = g_unique_id++;
-
- /* We don't care about wraps, but we don't want zero */
- if(g_unique_id == 0)
- g_unique_id++;
- punlock();
-
- ctx->client.fd = fd;
- ASSERT(ctx->client.fd != -1);
- messagex(ctx, LOG_DEBUG, "processing %d on thread %x", ctx->client.fd, (int)pthread_self());
-
- /* Connect to the outgoing server ... */
- if(connect_out(ctx) == -1)
- RETURN(-1);
-
- /* ... and to the AV daemon */
- if(connect_clam(ctx) == -1)
- RETURN(-1);
-
/* call the processor */
processing = 1;
ret = smtp_passthru(ctx);
@@ -602,25 +599,22 @@ cleanup:
if(ctx)
{
- disconnect_clam(ctx);
-
/* Let the client know about fatal errors */
- if(!processing && ret == -1 && clio_valid(&(ctx->client)))
- clio_write_data(ctx, &(ctx->client), SMTP_STARTFAILED);
+ if(!processing && ret == -1 && spio_valid(&(ctx->client)))
+ spio_write_data(ctx, &(ctx->client), SMTP_STARTFAILED);
- clio_disconnect(ctx, &(ctx->client));
- clio_disconnect(ctx, &(ctx->server));
+ done_thread(ctx);
}
/* mark this as done */
- plock();
+ sp_lock();
thread->fd = -1;
- punlock();
+ sp_unlock();
return (void*)(ret == 0 ? 0 : 1);
}
-static int connect_out(clamsmtp_context_t* ctx)
+static int connect_out(spctx_t* ctx)
{
struct sockaddr_any peeraddr;
struct sockaddr_any addr;
@@ -634,16 +628,16 @@ static int connect_out(clamsmtp_context_t* ctx)
/* Get the peer name */
if(getpeername(ctx->client.fd, &SANY_ADDR(peeraddr), &SANY_LEN(peeraddr)) == -1 ||
sock_any_ntop(&peeraddr, buf, MAXPATHLEN, SANY_OPT_NOPORT) == -1)
- message(ctx, LOG_WARNING, "couldn't get peer address");
+ sp_message(ctx, LOG_WARNING, "couldn't get peer address");
else
- messagex(ctx, LOG_INFO, "accepted connection from: %s", buf);
+ sp_messagex(ctx, LOG_INFO, "accepted connection from: %s", buf);
/* Create the server connection address */
- outaddr = &(g_state->outaddr);
- outname = g_state->outname;
+ outaddr = &(g_state.outaddr);
+ outname = g_state.outname;
/* For transparent proxying we have to discover the address to connect to */
- if(g_state->transparent)
+ if(g_state.transparent)
{
memset(&addr, 0, sizeof(addr));
SANY_LEN(addr) = sizeof(addr);
@@ -654,14 +648,14 @@ static int connect_out(clamsmtp_context_t* ctx)
if(getsockname(ctx->client.fd, &SANY_ADDR(addr), &SANY_LEN(addr)) == -1)
#endif
{
- message(ctx, LOG_ERR, "couldn't get source address for transparent proxying");
+ sp_message(ctx, LOG_ERR, "couldn't get source address for transparent proxying");
return -1;
}
/* Check address types */
if(sock_any_cmp(&addr, &peeraddr, SANY_OPT_NOPORT) == 0)
{
- messagex(ctx, LOG_ERR, "loop detected in transparent proxying");
+ sp_messagex(ctx, LOG_ERR, "loop detected in transparent proxying");
return -1;
}
@@ -675,7 +669,7 @@ static int connect_out(clamsmtp_context_t* ctx)
outaddr->s.in.sin_addr.s_addr == 0)
{
/* Use the incoming IP as the default */
- memcpy(&addr, &(g_state->outaddr), sizeof(addr));
+ memcpy(&addr, &(g_state.outaddr), sizeof(addr));
memcpy(&(addr.s.in.sin_addr), &(peeraddr.s.in.sin_addr), sizeof(addr.s.in.sin_addr));
outaddr = &addr;
}
@@ -684,7 +678,7 @@ static int connect_out(clamsmtp_context_t* ctx)
outaddr->s.in.in6.sin_addr.s_addr == 0)
{
/* Use the incoming IP as the default */
- memcpy(&addr, &(g_state->outaddr), sizeof(addr));
+ memcpy(&addr, &(g_state.outaddr), sizeof(addr));
memcpy(&(addr.s.in.sin6_addr), &(peeraddr.s.in.sin6_addr), sizeof(addr.s.in.sin6_addr));
outaddr = &addr;
}
@@ -692,7 +686,7 @@ static int connect_out(clamsmtp_context_t* ctx)
}
/* Reparse name if possible */
- if(outaddr != &(g_state->outaddr))
+ if(outaddr != &(g_state.outaddr))
{
if(sock_any_ntop(outaddr, buf, MAXPATHLEN, 0) != -1)
outname = buf;
@@ -701,7 +695,7 @@ static int connect_out(clamsmtp_context_t* ctx)
}
/* Connect to the server */
- if(clio_connect(ctx, &(ctx->server), outaddr, outname) == -1)
+ if(spio_connect(ctx, &(ctx->server), outaddr, outname) == -1)
return -1;
return 0;
@@ -711,33 +705,33 @@ static int connect_out(clamsmtp_context_t* ctx)
* SMTP HANDLING
*/
-static int smtp_passthru(clamsmtp_context_t* ctx)
+static int smtp_passthru(spctx_t* ctx)
{
- clio_t* io = NULL;
- char logline[LINE_LENGTH];
int r, ret = 0;
+ unsigned int mask;
int neterror = 0;
int first_rsp = 1; /* The first 220 response from server to be filtered */
int filter_ehlo = 0; /* Filtering parts of an EHLO extensions response */
int filter_host = 0; /* Next response is 250 hostname, which we change */
- ASSERT(clio_valid(&(ctx->clam)) &&
- clio_valid(&(ctx->clam)));
- logline[0] = 0;
+ ASSERT(spio_valid(&(ctx->client)) &&
+ spio_valid(&(ctx->server)));
for(;;)
{
- if(clio_select(ctx, &io) == -1)
+ mask = spio_select(ctx, &(ctx->client), &(ctx->server), NULL);
+
+ if(mask == ~0)
{
neterror = 1;
RETURN(-1);
}
/* Client has data available, read a line and process */
- if(io == &(ctx->client))
+ if(mask & 1)
{
- if(clio_read_line(ctx, &(ctx->client), CLIO_DISCARD) == -1)
+ if(spio_read_line(ctx, &(ctx->client), SPIO_DISCARD) == -1)
RETURN(-1);
/* Client disconnected, we're done */
@@ -747,7 +741,7 @@ static int smtp_passthru(clamsmtp_context_t* ctx)
/* We don't let clients send really long lines */
if(LINE_TOO_LONG(ctx))
{
- if(clio_write_data(ctx, &(ctx->client), SMTP_TOOLONG) == -1)
+ if(spio_write_data(ctx, &(ctx->client), SMTP_TOOLONG) == -1)
RETURN(-1);
continue;
@@ -761,7 +755,7 @@ static int smtp_passthru(clamsmtp_context_t* ctx)
if(is_first_word(ctx->line, DATA_CMD, KL(DATA_CMD)))
{
/* Send back the intermediate response to the client */
- if(clio_write_data(ctx, &(ctx->client), SMTP_DATAINTERMED) == -1)
+ if(spio_write_data(ctx, &(ctx->client), SMTP_DATAINTERMED) == -1)
RETURN(-1);
/*
@@ -769,14 +763,14 @@ static int smtp_passthru(clamsmtp_context_t* ctx)
* sending of the data to the server, making the av check
* transparent
*/
- if(avcheck_data(ctx, logline) == -1)
+ if(cb_check_data(ctx) == -1)
RETURN(-1);
/* Print the log out for this email */
- messagex(ctx, LOG_INFO, "%s", logline);
+ sp_messagex(ctx, LOG_INFO, "%s", ctx->logline);
- /* Reset log line */
- logline[0] = 0;
+ /* Done with that email */
+ cleanup_context(ctx);
/* Command handled */
continue;
@@ -788,12 +782,12 @@ static int smtp_passthru(clamsmtp_context_t* ctx)
*/
else if(is_first_word(ctx->line, EHLO_CMD, KL(EHLO_CMD)))
{
- messagex(ctx, LOG_DEBUG, "filtering EHLO response");
+ sp_messagex(ctx, LOG_DEBUG, "filtering EHLO response");
filter_ehlo = 1;
filter_host = 1;
- /* A new message */
- logline[0] = 0;
+ /* New email so cleanup */
+ cleanup_context(ctx);
}
/*
@@ -804,8 +798,8 @@ static int smtp_passthru(clamsmtp_context_t* ctx)
{
filter_host = 1;
- /* A new message line */
- logline[0] = 0;
+ /* A new email so cleanup */
+ cleanup_context(ctx);
}
/*
@@ -816,9 +810,9 @@ static int smtp_passthru(clamsmtp_context_t* ctx)
else if(is_first_word(ctx->line, STARTTLS_CMD, KL(STARTTLS_CMD)) ||
is_first_word(ctx->line, BDAT_CMD, KL(BDAT_CMD)))
{
- messagex(ctx, LOG_DEBUG, "ESMTP feature not supported");
+ sp_messagex(ctx, LOG_DEBUG, "ESMTP feature not supported");
- if(clio_write_data(ctx, &(ctx->client), SMTP_NOTSUPP) == -1)
+ if(spio_write_data(ctx, &(ctx->client), SMTP_NOTSUPP) == -1)
RETURN(-1);
/* Command handled */
@@ -827,34 +821,34 @@ static int smtp_passthru(clamsmtp_context_t* ctx)
/* Append recipients to log line */
else if((r = check_first_word(ctx->line, FROM_CMD, KL(FROM_CMD), SMTP_DELIMS)) > 0)
- add_to_logline(logline, "from=", ctx->line + r);
+ sp_add_log(ctx, "from=", ctx->line + r);
/* Append sender to log line */
else if((r = check_first_word(ctx->line, TO_CMD, KL(TO_CMD), SMTP_DELIMS)) > 0)
- add_to_logline(logline, "to=", ctx->line + r);
+ sp_add_log(ctx, "to=", ctx->line + r);
/* Reset log line */
else if(is_first_word(ctx->line, RSET_CMD, KL(RSET_CMD)))
- logline[0] = 0;
+ cleanup_context(ctx);
/* All other commands just get passed through to server */
- if(clio_write_data(ctx, &(ctx->server), ctx->line) == -1)
+ if(spio_write_data(ctx, &(ctx->server), ctx->line) == -1)
RETURN(-1);
continue;
}
/* Server has data available, read a line and forward */
- if(io == &(ctx->server))
+ if(mask & 2)
{
- if(clio_read_line(ctx, &(ctx->server), CLIO_DISCARD) == -1)
+ if(spio_read_line(ctx, &(ctx->server), SPIO_DISCARD) == -1)
RETURN(-1);
if(ctx->linelen == 0)
RETURN(0);
if(LINE_TOO_LONG(ctx))
- messagex(ctx, LOG_WARNING, "SMTP response line too long. discarded extra");
+ sp_messagex(ctx, LOG_WARNING, "SMTP response line too long. discarded extra");
/*
* We intercept the first response we get from the server.
@@ -874,9 +868,9 @@ static int smtp_passthru(clamsmtp_context_t* ctx)
if(is_first_word(ctx->line, START_RSP, KL(START_RSP)))
{
- messagex(ctx, LOG_DEBUG, "intercepting initial response");
+ sp_messagex(ctx, LOG_DEBUG, "intercepting initial response");
- if(clio_write_data(ctx, &(ctx->client), SMTP_BANNER) == -1)
+ if(spio_write_data(ctx, &(ctx->client), SMTP_BANNER) == -1)
RETURN(-1);
/* Command handled */
@@ -896,9 +890,9 @@ static int smtp_passthru(clamsmtp_context_t* ctx)
/* Check for a simple '250 xxxx' */
if(is_first_word(ctx->line, OK_RSP, KL(OK_RSP)))
{
- messagex(ctx, LOG_DEBUG, "intercepting host response");
+ sp_messagex(ctx, LOG_DEBUG, "intercepting host response");
- if(clio_write_data(ctx, &(ctx->client), SMTP_HELO_RSP) == -1)
+ if(spio_write_data(ctx, &(ctx->client), SMTP_HELO_RSP) == -1)
RETURN(-1);
continue;
@@ -907,9 +901,9 @@ static int smtp_passthru(clamsmtp_context_t* ctx)
/* Check for the continued response '250-xxxx' */
if(check_first_word(ctx->line, OK_RSP, KL(OK_RSP), SMTP_MULTI_DELIMS) > 0)
{
- messagex(ctx, LOG_DEBUG, "intercepting host response");
+ sp_messagex(ctx, LOG_DEBUG, "intercepting host response");
- if(clio_write_data(ctx, &(ctx->client), SMTP_EHLO_RSP) == -1)
+ if(spio_write_data(ctx, &(ctx->client), SMTP_EHLO_RSP) == -1)
RETURN(-1);
continue;
@@ -931,13 +925,13 @@ static int smtp_passthru(clamsmtp_context_t* ctx)
is_first_word(p, ESMTP_BINARY, KL(ESMTP_BINARY)) ||
is_first_word(p, ESMTP_CHECK, KL(ESMTP_CHECK)))
{
- messagex(ctx, LOG_DEBUG, "filtered ESMTP feature: %s", trim_space(p));
+ sp_messagex(ctx, LOG_DEBUG, "filtered ESMTP feature: %s", trim_space(p));
continue;
}
}
}
- if(clio_write_data(ctx, &(ctx->client), ctx->line) == -1)
+ if(spio_write_data(ctx, &(ctx->client), ctx->line) == -1)
RETURN(-1);
continue;
@@ -946,498 +940,553 @@ static int smtp_passthru(clamsmtp_context_t* ctx)
cleanup:
- if(!neterror && ret == -1 && clio_valid(&(ctx->client)))
- clio_write_data(ctx, &(ctx->client), SMTP_FAILED);
+ if(!neterror && ret == -1 && spio_valid(&(ctx->client)))
+ spio_write_data(ctx, &(ctx->client), SMTP_FAILED);
return ret;
}
-static void add_to_logline(char* logline, char* prefix, char* line)
-{
- int l = strlen(logline);
- char* t = logline;
+/* -----------------------------------------------------------------------------
+ * SMTP PASSTHRU FUNCTIONS FOR DATA CHECK
+ */
- /* Simple optimization */
- logline += l;
- l = LINE_LENGTH - l;
+void sp_add_log(spctx_t* ctx, char* prefix, char* line)
+{
+ int l = SP_LINE_LENGTH;
+ char* t = ctx->logline;
ASSERT(l >= 0);
if(t[0] != 0)
- strlcat(logline, ", ", l);
+ strlcat(ctx->logline, ", ", l);
- strlcat(logline, prefix, l);
+ strlcat(ctx->logline, prefix, l);
/* Skip initial white space */
line = trim_start(line);
- strlcat(logline, line, l);
+ strlcat(ctx->logline, line, l);
/* Skip later white space */
- trim_end(logline);
+ trim_end(ctx->logline);
}
-static int avcheck_data(clamsmtp_context_t* ctx, char* logline)
+int sp_read_data(spctx_t* ctx, const char** data)
{
- /*
- * Note that most failures are non fatal in this function.
- * We only return -1 for data connection errors and the like,
- * For most others we actually send a response back to the
- * client letting them know what happened and let the SMTP
- * connection continue.
- */
+ ASSERT(ctx);
+ ASSERT(data);
- char buf[MAXPATHLEN];
- int havefile = 0;
- int r, ret = 0;
+ *data = NULL;
+
+ switch(spio_read_line(ctx, &(ctx->client), SPIO_QUIET))
+ {
+ case 0:
+ sp_messagex(ctx, LOG_ERR, "unexpected end of data from client");
+ return -1;
+ case -1:
+ /* Message already printed */
+ return -1;
+ };
+
+ if(ctx->_crlf && strcmp(ctx->line, DATA_END_SIG) == 0)
+ return 0;
+
+ /* Check if this line ended with a CRLF */
+ ctx->_crlf = (strcmp(CRLF, ctx->line + (ctx->linelen - KL(CRLF))) == 0);
+ *data = ctx->line;
+ return ctx->linelen;
+}
+
+int sp_write_data(spctx_t* ctx, const char* buf, int len)
+{
+ int r = 0;
- strlcpy(buf, g_state->directory, MAXPATHLEN);
- strlcat(buf, "/clamsmtpd.XXXXXX", MAXPATHLEN);
+ ASSERT(ctx);
- /* transfer_to_file deletes the temp file on failure */
- if((r = transfer_to_file(ctx, buf)) > 0)
+ /* When a null buffer close the cache file */
+ if(!buf)
{
- havefile = 1;
- r = clam_scan_file(ctx, buf, logline);
+ if(ctx->cachefile)
+ {
+ if(fclose(ctx->cachefile) == EOF)
+ {
+ sp_message(ctx, LOG_ERR, "couldn't write to cache file: %s", ctx->cachename);
+ r = -1;
+ }
+
+ ctx->cachefile = NULL;
+ }
+
+ return r;
}
- switch(r)
+ /* Make sure we have a file open */
+ if(!ctx->cachefile)
{
+ int tfd;
- /*
- * There was an error tell the client. We haven't notified
- * the server about any of this yet
- */
- case -1:
- if(clio_write_data(ctx, &(ctx->client), SMTP_FAILED))
- RETURN(-1);
- break;
+ /* Make sure afore mentioned file is gone */
+ if(ctx->cachename[0])
+ unlink(ctx->cachename);
- /*
- * No virus was found. Now we initiate a connection to the server
- * and transfer the file to it.
- */
- case 0:
- if(complete_data_transfer(ctx, buf) == -1)
- RETURN(-1);
- break;
-
- /*
- * A virus was found, normally we just drop the email. But if
- * requested we can send a simple message back to our client.
- * The server doesn't know data was ever sent, and the client can
- * choose to reset the connection to reuse it if it wants.
- */
- case 1:
- if(clio_write_data(ctx, &(ctx->client),
- g_state->bounce ? SMTP_DATAVIRUS : SMTP_DATAVIRUSOK) == -1)
- RETURN(-1);
+ snprintf(ctx->cachename, MAXPATHLEN, "%s/%s.XXXXXX",
+ g_state.directory, g_state.name);
- /* Any special post operation actions on the virus */
- quarantine_virus(ctx, buf);
- break;
+ if((tfd = mkstemp(ctx->cachename)) == -1 ||
+ (ctx->cachefile = fdopen(tfd, "w")) == NULL)
+ {
+ if(tfd != -1)
+ close(tfd);
- default:
- ASSERT(0 && "Invalid clam_scan_file return value");
- break;
- };
+ sp_message(ctx, LOG_ERR, "couldn't open cache file");
+ return -1;
+ }
-cleanup:
- if(havefile && !g_state->debug_files)
+ sp_messagex(ctx, LOG_DEBUG, "created cache file: %s", ctx->cachename);
+ }
+
+ fwrite(buf, 1, len, ctx->cachefile);
+
+ if(ferror(ctx->cachefile))
{
- messagex(ctx, LOG_DEBUG, "deleting temporary file: %s", buf);
- unlink(buf);
+ sp_message(ctx, LOG_ERR, "couldn't write to cache file: %s", ctx->cachename);
+ return -1;
}
- return ret;
+ return len;
}
-static int complete_data_transfer(clamsmtp_context_t* ctx, const char* tempname)
+int sp_cache_data(spctx_t* ctx)
{
- ASSERT(ctx);
- ASSERT(tempname);
+ int r, count = 0;
+ const char* data;
- /* Ask the server for permission to send data */
- if(clio_write_data(ctx, &(ctx->server), SMTP_DATA) == -1)
+ while((r = sp_read_data(ctx, &data)) != 0)
+ {
+ if(r < 0)
+ return -1; /* Message already printed */
+
+ count += r;
+
+ if((r = sp_write_data(ctx, data, r)) < 0)
+ return -1; /* Message already printed */
+ }
+
+ /* End the caching */
+ if(sp_write_data(ctx, NULL, 0) < 0)
return -1;
+ sp_messagex(ctx, LOG_DEBUG, "wrote %d bytes to cache", count);
+ return count;
+}
+
+int sp_done_data(spctx_t* ctx, const char* header)
+{
+ FILE* file = 0;
+ int had_header = 0;
+ int ret = 0;
+
+ ASSERT(ctx->cachename[0]); /* Must still be around */
+ ASSERT(!ctx->cachefile); /* File must be closed */
+
+ /* Open the file */
+ file = fopen(ctx->cachename, "r");
+ if(file == NULL)
+ {
+ sp_message(ctx, LOG_ERR, "couldn't open cache file: %s", ctx->cachename);
+ RETURN(-1);
+ }
+
+ /* Ask the server for permission to send data */
+ if(spio_write_data(ctx, &(ctx->server), SMTP_DATA) == -1)
+ RETURN(-1);
+
if(read_server_response(ctx) == -1)
- return -1;
+ RETURN(-1);
/* If server returns an error then tell the client */
if(!is_first_word(ctx->line, DATA_RSP, KL(DATA_RSP)))
{
- if(clio_write_data(ctx, &(ctx->client), ctx->line) == -1)
- return -1;
+ if(spio_write_data(ctx, &(ctx->client), ctx->line) == -1)
+ RETURN(-1);
- messagex(ctx, LOG_DEBUG, "server refused data transfer");
+ sp_messagex(ctx, LOG_DEBUG, "server refused data transfer");
- return 0;
+ RETURN(-1);
}
- /* Now pull up the file and send it to the server */
- if(transfer_from_file(ctx, tempname) == -1)
+ sp_messagex(ctx, LOG_DEBUG, "sending from cache file: %s", ctx->cachename);
+
+ /* Transfer actual file data */
+ while(fgets(ctx->line, SP_LINE_LENGTH, file) != NULL)
+ {
+ if(header && !had_header)
+ {
+ /*
+ * The first blank line we see means the headers are done.
+ * At this point we add in our virus checked header.
+ */
+ if(is_blank_line(ctx->line))
+ {
+ if(spio_write_data_raw(ctx, &(ctx->server), (char*)header, strlen(header)) == -1 ||
+ spio_write_data_raw(ctx, &(ctx->server), CRLF, KL(CRLF)) == -1)
+ RETURN(-1);
+
+ had_header = 1;
+ }
+ }
+
+ if(spio_write_data_raw(ctx, &(ctx->server), ctx->line, strlen(ctx->line)) == -1)
+ RETURN(-1);
+ }
+
+ if(ferror(file))
+ sp_message(ctx, LOG_ERR, "error reading cache file: %s", ctx->cachename);
+
+ if(ferror(file) || spio_write_data(ctx, &(ctx->server), DATA_END_SIG) == -1)
{
/* Tell the client it went wrong */
- clio_write_data(ctx, &(ctx->client), SMTP_FAILED);
- return -1;
+ spio_write_data(ctx, &(ctx->client), SMTP_FAILED);
+ RETURN(-1);
}
+ sp_messagex(ctx, LOG_DEBUG, "sent email data");
+
/* Okay read the response from the server and echo it to the client */
if(read_server_response(ctx) == -1)
- return -1;
+ RETURN(-1);
+
+ if(spio_write_data(ctx, &(ctx->client), ctx->line) == -1)
+ RETURN(-1);
+
+cleanup:
+
+ if(file)
+ fclose(file); /* read-only so no error check */
+
+ return ret;
+}
+
+int sp_fail_data(spctx_t* ctx, const char* smtp_status)
+{
+ char* t;
+ int len, x;
+
+ if(smtp_status == NULL)
+ {
+ smtp_status = SMTP_FAILED;
+ }
+
+ else
+ {
+ len = strlen(smtp_status);
+
+ /* We need 3 digits and CRLF at the end for a premade SMTP message */
+ if(strtol(smtp_status, &t, 10) == 0 || t != smtp_status + 3 ||
+ strcmp(smtp_status + (len - KL(CRLF)), CRLF) != 0)
+ {
+ if(len > 256)
+ len = 256;
+
+ x = len + KL(SMTP_REJPREFIX) + KL(CRLF) + 1;
+ t = (char*)alloca(x);
- if(clio_write_data(ctx, &(ctx->client), ctx->line) == -1)
+ /* Note that we truncate long lines */
+ snprintf(t, x, "%s%.256s%s", SMTP_REJPREFIX, smtp_status, CRLF);
+ smtp_status = t;
+ }
+ }
+
+ if(spio_write_data(ctx, &(ctx->client), smtp_status) == -1)
return -1;
return 0;
}
-static int read_server_response(clamsmtp_context_t* ctx)
+static int read_server_response(spctx_t* ctx)
{
/* Read response line from the server */
- if(clio_read_line(ctx, &(ctx->server), CLIO_DISCARD) == -1)
+ if(spio_read_line(ctx, &(ctx->server), SPIO_DISCARD) == -1)
return -1;
if(ctx->linelen == 0)
{
- messagex(ctx, LOG_ERR, "server disconnected unexpectedly");
+ sp_messagex(ctx, LOG_ERR, "server disconnected unexpectedly");
/* Tell the client it went wrong */
- clio_write_data(ctx, &(ctx->client), SMTP_FAILED);
+ spio_write_data(ctx, &(ctx->client), SMTP_FAILED);
return 0;
}
if(LINE_TOO_LONG(ctx))
- messagex(ctx, LOG_WARNING, "SMTP response line too long. discarded extra");
+ sp_messagex(ctx, LOG_WARNING, "SMTP response line too long. discarded extra");
return 0;
}
-
/* ----------------------------------------------------------------------------------
- * CLAM AV
+ * LOGGING
*/
-static int connect_clam(clamsmtp_context_t* ctx)
-{
- int ret = 0;
+const char kMsgDelimiter[] = ": ";
+#define MAX_MSGLEN 256
- ASSERT(ctx);
- ASSERT(!clio_valid(&(ctx->clam)));
+static void vmessage(spctx_t* ctx, int level, int err,
+ const char* msg, va_list ap)
+{
+ size_t len;
+ char* m;
+ int e = errno;
- if(clio_connect(ctx, &(ctx->clam), &(g_state->clamaddr), g_state->clamname) == -1)
- RETURN(-1);
+ if(g_state.daemonized)
+ {
+ if(level >= LOG_DEBUG)
+ return;
+ }
+ else
+ {
+ if(g_state.debug_level < level)
+ return;
+ }
- read_junk(ctx, ctx->clam.fd);
+ ASSERT(msg);
- /* Send a session and a check header to ClamAV */
+ len = strlen(msg) + 20 + MAX_MSGLEN;
+ m = (char*)alloca(len);
- if(clio_write_data(ctx, &(ctx->clam), "SESSION\n") == -1)
- RETURN(-1);
+ if(m)
+ {
+ if(ctx)
+ snprintf(m, len, "%06X: %s%s", ctx->id, msg, err ? ": " : "");
+ else
+ snprintf(m, len, "%s%s", msg, err ? ": " : "");
- read_junk(ctx, ctx->clam.fd);
-/*
- if(clio_write_data(ctx, &(ctx->clam), "PING\n") == -1 ||
- clio_read_line(ctx, &(ctx->clam), CLIO_DISCARD | CLIO_TRIM) == -1)
- RETURN(-1);
+ if(err)
+ {
+ /* TODO: strerror_r doesn't want to work for us
+ strerror_r(e, m + strlen(m), MAX_MSGLEN); */
+ strncat(m, strerror(e), len);
+ }
- if(strcmp(ctx->line, CONNECT_RESPONSE) != 0)
- {
- message(ctx, LOG_ERR, "clamd sent an unexpected response: %s", ctx->line);
- RETURN(-1);
+ m[len - 1] = 0;
+ msg = m;
}
-*/
-cleanup:
+ /* Either to syslog or stderr */
+ if(g_state.daemonized)
+ vsyslog(level, msg, ap);
+ else
+ vwarnx(msg, ap);
+}
- if(ret < 0)
- clio_disconnect(ctx, &(ctx->clam));
+void sp_messagex(spctx_t* ctx, int level, const char* msg, ...)
+{
+ va_list ap;
- return ret;
+ va_start(ap, msg);
+ vmessage(ctx, level, 0, msg, ap);
+ va_end(ap);
}
-static int disconnect_clam(clamsmtp_context_t* ctx)
+void sp_message(spctx_t* ctx, int level, const char* msg, ...)
{
- if(!clio_valid(&(ctx->clam)))
- return 0;
+ va_list ap;
- if(clio_write_data(ctx, &(ctx->clam), CLAM_DISCONNECT) != -1)
- read_junk(ctx, ctx->clam.fd);
-
- clio_disconnect(ctx, &(ctx->clam));
- return 0;
+ va_start(ap, msg);
+ vmessage(ctx, level, 1, msg, ap);
+ va_end(ap);
}
-static int clam_scan_file(clamsmtp_context_t* ctx, const char* tempname, char* logline)
-{
- int len;
- ASSERT(LINE_LENGTH > MAXPATHLEN + 32);
+/* -----------------------------------------------------------------------
+ * LOCKING
+ */
- strcpy(ctx->line, CLAM_SCAN);
- strcat(ctx->line, tempname);
- strcat(ctx->line, "\n");
+void sp_lock()
+{
+ int r;
- if(clio_write_data(ctx, &(ctx->clam), ctx->line) == -1)
- return -1;
+#ifdef _DEBUG
+ int wait = 0;
+#endif
- len = clio_read_line(ctx, &(ctx->clam), CLIO_DISCARD | CLIO_TRIM);
- if(len == 0)
+#ifdef _DEBUG
+ r = pthread_mutex_trylock(&g_mutex);
+ if(r == EBUSY)
{
- messagex(ctx, LOG_ERR, "clamd disconnected unexpectedly");
- return -1;
+ wait = 1;
+ sp_message(NULL, LOG_DEBUG, "thread will block: %d", pthread_self());
+ r = pthread_mutex_lock(&g_mutex);
}
- if(is_last_word(ctx->line, CLAM_OK, KL(CLAM_OK)))
+#else
+ r = pthread_mutex_lock(&g_mutex);
+
+#endif
+
+ if(r != 0)
{
- add_to_logline(logline, "status=", "CLEAN");
- messagex(ctx, LOG_DEBUG, "no virus");
- return 0;
+ errno = r;
+ sp_message(NULL, LOG_CRIT, "threading problem. couldn't lock mutex");
}
- if(is_last_word(ctx->line, CLAM_FOUND, KL(CLAM_FOUND)))
+#ifdef _DEBUG
+ else if(wait)
{
- len = strlen(tempname);
-
- if(ctx->linelen > len)
- add_to_logline(logline, "status=VIRUS:", ctx->line + len + 1);
- else
- add_to_logline(logline, "status=", "VIRUS");
-
- messagex(ctx, LOG_DEBUG, "found virus");
- return 1;
+ sp_message(NULL, LOG_DEBUG, "thread unblocked: %d", pthread_self());
}
+#endif
+}
- if(is_last_word(ctx->line, CLAM_ERROR, KL(CLAM_ERROR)))
+void sp_unlock()
+{
+ int r = pthread_mutex_unlock(&g_mutex);
+ if(r != 0)
{
- messagex(ctx, LOG_ERR, "clamav error: %s", ctx->line);
- add_to_logline(logline, "status=", "CLAMAV-ERROR");
- return -1;
+ errno = r;
+ sp_message(NULL, LOG_CRIT, "threading problem. couldn't unlock mutex");
}
-
- add_to_logline(logline, "status=", "CLAMAV-ERROR");
- messagex(ctx, LOG_ERR, "unexepected response from clamd: %s", ctx->line);
- return -1;
}
-
-/* ----------------------------------------------------------------------------------
- * TEMP FILE HANDLING
+/* -----------------------------------------------------------------------------
+ * CONFIG FILE
*/
-static int quarantine_virus(clamsmtp_context_t* ctx, char* tempname)
+int sp_parse_option(const char* name, const char* value)
{
- char buf[MAXPATHLEN];
char* t;
+ int ret = 0;
- if(!g_state->quarantine)
- return 0;
-
- strlcpy(buf, g_state->directory, MAXPATHLEN);
- strlcat(buf, "/virus.", MAXPATHLEN);
-
- /* Points to null terminator */
- t = buf + strlen(buf);
-
- /*
- * Yes, I know we're using mktemp. And yet we're doing it in
- * a safe manner due to the link command below not overwriting
- * existing files.
- */
- for(;;)
+ if(strcasecmp(CFG_MAXTHREADS, name) == 0)
{
- /* Null terminate off the ending, and replace with X's for mktemp */
- *t = 0;
- strlcat(buf, "XXXXXX", MAXPATHLEN);
-
- if(!mktemp(buf))
- {
- message(ctx, LOG_ERR, "couldn't create quarantine file name");
- return -1;
- }
-
- /* Try to link the file over to the temp */
- if(link(tempname, buf) == -1)
- {
- /* We don't want to allow race conditions */
- if(errno == EEXIST)
- {
- message(ctx, LOG_WARNING, "race condition when quarantining virus file: %s", buf);
- continue;
- }
-
- message(ctx, LOG_ERR, "couldn't quarantine virus file");
- return -1;
- }
-
- break;
+ g_state.max_threads = strtol(value, &t, 10);
+ if(*t || g_state.max_threads <= 1 || g_state.max_threads >= 1024)
+ errx(2, "invalid setting: " CFG_MAXTHREADS " (must be between 1 and 1024)");
+ ret = 1;
}
- messagex(ctx, LOG_INFO, "quarantined virus file as: %s", buf);
- return 0;
-}
-
-static int transfer_to_file(clamsmtp_context_t* ctx, char* tempname)
-{
- FILE* tfile = NULL;
- int tfd = -1;
- int ended_crlf = 1; /* If the last line ended with a CRLF */
- int ret = 0;
- int count = 0;
-
- if((tfd = mkstemp(tempname)) == -1 ||
- (tfile = fdopen(tfd, "w")) == NULL)
+ else if(strcasecmp(CFG_TIMEOUT, name) == 0)
{
- message(ctx, LOG_ERR, "couldn't open temp file");
- RETURN(-1);
+ g_state.timeout.tv_sec = strtol(value, &t, 10);
+ if(*t || g_state.timeout.tv_sec <= 0)
+ errx(2, "invalid setting: " CFG_TIMEOUT);
+ ret = 1;
}
- messagex(ctx, LOG_DEBUG, "created temporary file: %s", tempname);
-
- for(;;)
+ else if(strcasecmp(CFG_OUTADDR, name) == 0)
{
- switch(clio_read_line(ctx, &(ctx->client), CLIO_QUIET))
- {
- case 0:
- messagex(ctx, LOG_ERR, "unexpected end of data from client");
- RETURN(-1);
-
- case -1:
- /* Message already printed */
- RETURN(-1);
- };
-
- if(ended_crlf && strcmp(ctx->line, DATA_END_SIG) == 0)
- break;
-
- /* We check errors on this later */
- fwrite(ctx->line, 1, ctx->linelen, tfile);
- count += ctx->linelen;
-
- /* Check if this line ended with a CRLF */
- ended_crlf = (strcmp(CRLF, ctx->line + (ctx->linelen - KL(CRLF))) == 0);
+ if(sock_any_pton(value, &(g_state.outaddr), SANY_OPT_DEFPORT(25)) == -1)
+ errx(2, "invalid " CFG_OUTADDR " socket name or ip: %s", value);
+ g_state.outname = value;
+ ret = 1;
}
- if(ferror(tfile))
+ else if(strcasecmp(CFG_LISTENADDR, name) == 0)
{
- message(ctx, LOG_ERR, "error writing to temp file: %s", tempname);
- RETURN(-1);
+ if(sock_any_pton(value, &(g_state.listenaddr), SANY_OPT_DEFANY | SANY_OPT_DEFPORT(DEFAULT_PORT)) == -1)
+ errx(2, "invalid " CFG_LISTENADDR " socket name or ip: %s", value);
+ g_state.listenname = value;
+ ret = 1;
}
- ret = count;
- messagex(ctx, LOG_DEBUG, "wrote %d bytes to temp file", count);
-
-cleanup:
-
- if(tfile)
- fclose(tfile);
-
- if(tfd != -1)
+ else if(strcasecmp(CFG_TRANSPARENT, name) == 0)
{
- /* Only close this if not opened as a stream */
- if(tfile == NULL)
- close(tfd);
+ if((g_state.transparent = strtob(value)) == -1)
+ errx(2, "invalid value for " CFG_TRANSPARENT);
+ ret = 1;
+ }
- if(ret <= 0)
- {
- messagex(ctx, LOG_DEBUG, "discarding temporary file");
- unlink(tempname);
- }
+ else if(strcasecmp(CFG_DIRECTORY, name) == 0)
+ {
+ if(strlen(value) == 0)
+ errx(2, "invalid setting: " CFG_DIRECTORY);
+ g_state.directory = value;
+ ret = 1;
}
+ /* Always pass through to program */
+ if(cb_parse_option(name, value) == 1)
+ ret = 1;
+
return ret;
}
-static int transfer_from_file(clamsmtp_context_t* ctx, const char* filename)
+static int parse_config_file(const char* configfile)
{
- FILE* file = NULL;
- int header = 0;
- int ret = 0;
-
- file = fopen(filename, "r");
- if(file == NULL)
- {
- message(ctx, LOG_ERR, "couldn't open temporary file: %s", filename);
- RETURN(-1);
- }
+ FILE* f = NULL;
+ long len;
+ char* p;
+ char* t;
+ char* n;
- messagex(ctx, LOG_DEBUG, "sending from temporary file: %s", filename);
+ ASSERT(configfile);
+ ASSERT(!g_state._p);
- while(fgets(ctx->line, LINE_LENGTH, file) != NULL)
+ f = fopen(configfile, "r");
+ if(f == NULL)
{
- if(g_state->header && !header)
- {
- /*
- * The first blank line we see means the headers are done.
- * At this point we add in our virus checked header.
- */
- if(is_blank_line(ctx->line))
- {
- if(clio_write_data_raw(ctx, &(ctx->server), (char*)g_state->header, strlen(g_state->header)) == -1 ||
- clio_write_data_raw(ctx, &(ctx->server), CRLF, KL(CRLF)) == -1)
- RETURN(-1);
-
- header = 1;
- }
- }
-
- if(clio_write_data_raw(ctx, &(ctx->server), ctx->line, strlen(ctx->line)) == -1)
- RETURN(-1);
+ /* Soft errors when default config file and not found */
+ if((errno == ENOENT || errno == ENOTDIR))
+ return -1;
+ else
+ err(1, "couldn't open config file: %s", configfile);
}
- if(ferror(file))
- {
- message(ctx, LOG_ERR, "error reading temporary file: %s", filename);
- RETURN(-1);
- }
+ /* Figure out size */
+ if(fseek(f, 0, SEEK_END) == -1 || (len = ftell(f)) == -1 || fseek(f, 0, SEEK_SET) == -1)
+ err(1, "couldn't seek config file: %s", configfile);
- if(clio_write_data(ctx, &(ctx->server), DATA_END_SIG) == -1)
- RETURN(-1);
+ if((g_state._p = (char*)malloc(len + 2)) == NULL)
+ errx(1, "out of memory");
- messagex(ctx, LOG_DEBUG, "sent email data");
+ /* And read in one block */
+ if(fread(g_state._p, 1, len, f) != len)
+ err(1, "couldn't read config file: %s", configfile);
-cleanup:
+ fclose(f);
+ sp_messagex(NULL, LOG_DEBUG, "read config file: %s", configfile);
- if(file != NULL)
- fclose(file);
+ /* Double null terminate the data */
+ p = g_state._p;
+ p[len] = 0;
+ p[len + 1] = 0;
- return ret;
-}
+ n = g_state._p;
+ /* Go through lines and process them */
+ while((t = strchr(n, '\n')) != NULL)
+ {
+ *t = 0;
+ p = n; /* Do this before cleaning below */
+ n = t + 1;
-/* ----------------------------------------------------------------------------------
- * NETWORKING
- */
+ p = trim_start(p);
-static void read_junk(clamsmtp_context_t* ctx, int fd)
-{
- char buf[16];
- const char* t;
- int said = 0;
- int l;
+ /* Comments and empty lines */
+ if(*p == 0 || *p == '#')
+ continue;
- if(fd == -1)
- return;
+ /* Look for the break between name: value */
+ t = strchr(p, ':');
+ if(t == NULL)
+ errx(2, "invalid config line: %s", p);
- /* Make it non blocking */
- fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) | O_NONBLOCK);
+ /* Null terminate and split value part */
+ *t = 0;
+ t++;
- for(;;)
- {
- l = read(fd, buf, sizeof(buf) - 1);
- if(l <= 0)
- break;
+ t = trim_space(t);
+ p = trim_space(p);
- buf[l] = 0;
- t = trim_start(buf);
+ /* Pass it through our options parsers */
+ if(sp_parse_option(p, t) == 0)
- if(!said && *t)
- {
- messagex(ctx, LOG_DEBUG, "received junk data from daemon");
- said = 1;
- }
+ /* If not recognized then it's invalid */
+ errx(2, "invalid config line: %s", p);
+
+ sp_messagex(NULL, LOG_DEBUG, "parsed option: %s: %s", p, t);
}
- fcntl(fd, F_SETFL, fcntl(fd, F_GETFL, 0) & ~O_NONBLOCK);
+ return 0;
}
+
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-01 10:27:52 +0000