Abandon milter
Signed-off-by: Tyrolyean <tyrolyean@tyrolyean.net>
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src/main.c
229
src/main.c
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@ -13,230 +13,23 @@
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#include <unistd.h>
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#include <sys/stat.h>
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#include <libmilter/mfapi.h>
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#include <libmilter/mfdef.h>
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#include "version.h"
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#include "config.h"
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#include "attach.h"
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struct mlfiPriv
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{
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char *mlfi_fname;
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FILE *mlfi_fp;
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};
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#define MLFIPRIV ((struct mlfiPriv *) smfi_getpriv(ctx))
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static unsigned long mta_caps = 0;
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sfsistat mlfi_cleanup(SMFICTX* ctx, bool ok) {
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sfsistat rstat = SMFIS_CONTINUE;
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struct mlfiPriv *priv = MLFIPRIV;
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int main(int argc, char* argv[]){
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if (priv == NULL){
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/* Something weired mus have happened... Maybe a crash? */
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return rstat;
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}
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if (ok){
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/* add a header to the message announcing our presence */
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smfi_addheader(ctx, "X-Mail-Attached", VERSION);
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/* replace body if attachements have been found */
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char* new_body = attach_files(priv->mlfi_fp);
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if(new_body != NULL){
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const char* head = "REPLACED:";
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size_t new_bodylen = strlen(new_body)+10;
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unsigned char * replacement = malloc(new_bodylen+1);
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memset(replacement, 0, new_bodylen+1);
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strcat((char*)replacement, head);
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strcat((char*)replacement, new_body);
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free(new_body);
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printf("Replacing body of mail message with len %lu\n",
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strlen((char*)replacement));
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printf("Content: [%s]\n",replacement);
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if(smfi_replacebody(ctx, replacement,
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strlen((char*)replacement)) ==
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MI_FAILURE){
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printf("Failed to replace body of message...\n"
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);
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free(replacement);
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}
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}
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}
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/* close the archive file */
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if (priv->mlfi_fp != NULL && fclose(priv->mlfi_fp) == EOF){
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/* failed; we have to wait until later */
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rstat = SMFIS_TEMPFAIL;
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(void) unlink(priv->mlfi_fname);
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}
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/* In any case release the temporary data storage file */
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(void) unlink(priv->mlfi_fname);
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/* release private memory */
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free(priv->mlfi_fname);
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free(priv);
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smfi_setpriv(ctx, NULL);
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return rstat;
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}
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sfsistat mlfi_envfrom(__attribute__((unused)) SMFICTX *ctx,
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__attribute__((unused)) char** envfrom) {
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struct mlfiPriv *priv;
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int fd = -1;
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/* allocate some private memory */
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priv = malloc(sizeof *priv);
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if (priv == NULL)
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{
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/* can't accept this message right now, memory has run out */
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return SMFIS_TEMPFAIL;
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}
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memset(priv, '\0', sizeof *priv);
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/* open a file to store this message */
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priv->mlfi_fname = strdup("/tmp/msg.XXXXXXXX");
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if (priv->mlfi_fname == NULL){
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free(priv);
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return SMFIS_TEMPFAIL;
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}
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if ((fd = mkstemp(priv->mlfi_fname)) < 0 ||
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(priv->mlfi_fp = fdopen(fd, "w+")) == NULL) {
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if (fd >= 0){
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(void) close(fd);
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}
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free(priv->mlfi_fname);
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free(priv);
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return SMFIS_TEMPFAIL;
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}
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printf("Storing temp message to %s\n", priv->mlfi_fname);
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/* save the private data */
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smfi_setpriv(ctx, priv);
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/* continue processing */
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return SMFIS_CONTINUE;
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}
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sfsistat mlfi_header(__attribute__((unused)) SMFICTX *ctx,
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__attribute__((unused)) char * headerf,
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__attribute__((unused))char * headerv){
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/* continue processing */
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return ((mta_caps & SMFIP_NR_HDR) != 0)
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? SMFIS_NOREPLY : SMFIS_CONTINUE;
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}
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sfsistat mlfi_body(SMFICTX* ctx, unsigned char * bodyp, size_t bodylen) {
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/* output body block to log file */
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if (fwrite(bodyp, bodylen, 1, MLFIPRIV->mlfi_fp) <= 0){
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perror("Failed to write body to file...");
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(void) mlfi_cleanup(ctx, false);
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return SMFIS_TEMPFAIL;
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}
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/* continue processing */
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return SMFIS_CONTINUE;
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}
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sfsistat mlfi_eom(ctx)
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SMFICTX *ctx;
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{
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return mlfi_cleanup(ctx, true);
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}
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sfsistat mlfi_abort(ctx)
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SMFICTX *ctx;
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{
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return mlfi_cleanup(ctx, false);
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}
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sfsistat mlfi_negotiate(__attribute__((unused)) SMFICTX* ctx,
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__attribute__((unused)) unsigned long f0, unsigned long f1,
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__attribute__((unused)) unsigned long f2,
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__attribute__((unused)) unsigned long f3, unsigned long* pf0,
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unsigned long* pf1, unsigned long* pf2, unsigned long* pf3)
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{
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/* milter actions: add headers */
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*pf0 = SMFIF_ADDHDRS;
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/* milter protocol steps: all but connect, HELO, RCPT */
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*pf1 = SMFIP_NOCONNECT|SMFIP_NOHELO|SMFIP_NORCPT;
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mta_caps = f1;
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if ((mta_caps & SMFIP_NR_HDR) != 0)
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*pf1 |= SMFIP_NR_HDR;
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*pf2 = 0;
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*pf3 = 0;
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return SMFIS_CONTINUE;
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}
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struct smfiDesc smfilter =
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{
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"mailattach", /* filter name */
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SMFI_VERSION, /* version code -- do not change */
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SMFIF_ADDHDRS|SMFIF_CHGFROM|SMFIF_ADDRCPT|SMFIF_DELRCPT|0b01|SMFIF_NONE, /* flags */
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NULL, /* connection info filter */
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NULL, /* SMTP HELO command filter */
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mlfi_envfrom, /* envelope sender filter */
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NULL, /* envelope recipient filter */
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mlfi_header, /* header filter */
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NULL, /* end of header */
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mlfi_body, /* body block filter */
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mlfi_eom, /* end of message */
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mlfi_abort, /* message aborted */
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NULL, /* connection cleanup */
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NULL, /* unknown/unimplemented SMTP commands */
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NULL, /* DATA command filter */
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mlfi_negotiate /* option negotiation at connection startup */
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};
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/* The actual entry point for the program. Performs initialisation routines and
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* then hands over to the libmilter main function */
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int main(){
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FILE* logfile = fopen("/tmp/shit", "a+");
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printf("INIT\n");
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const char* conn_prefix = "local:";
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size_t conn_len = strlen(socket_location)+strlen(conn_prefix)+1;
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char * conn_str = malloc(conn_len);
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memset(conn_str, 0, conn_len);
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strcat(conn_str, conn_prefix);
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strcat(conn_str, socket_location);
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printf("Using socket for milter communication at [%s]\n",
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conn_str);
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smfi_setconn(conn_str);
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if (smfi_register(smfilter) == MI_FAILURE)
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{
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fprintf(stderr, "smfi_register failed\n");
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return EXIT_FAILURE;
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}
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if(smfi_opensocket(true) == MI_FAILURE){
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fprintf(stderr, "smfi_opensocket failed at location [%s]\n",
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socket_location);
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return EXIT_FAILURE;
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}
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if(chmod(socket_location,0x1FF) < 0){
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perror("Failed to change socket permissions");
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fprintf(logfile, "INIT\n");
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fprintf(logfile, "Arguments passed on:\n");
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for(size_t i = 0; i < argc; i++){
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fprintf(logfile, "\t%lu:%s\n",i, argv[i]);
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}
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printf("READY, handing over to libmilter\n");
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return smfi_main();
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fclose(logfile);
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return EX_TEMPFAIL;
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}
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