/*
- * mime_parser.c
+ * $Id$
*
- * This is a really bad attempt at writing a parser to handle MIME-encoded
- * messages.
+ * This is the MIME parser for Citadel.
*
- * Copyright (c) 1998-1999 by Art Cancro
+ * Copyright (c) 1998-2005 by Art Cancro
* This code is distributed under the terms of the GNU General Public License.
*
*/
#include <sys/types.h>
#include <ctype.h>
#include <string.h>
-#include "mime_parser.h"
+#include <sys/stat.h>
+#include <errno.h>
+
+#include "citadel.h"
+#include "server.h"
+#include "serv_extensions.h"
+#include "sysdep_decls.h"
+#include "tools.h"
+#include "mime_parser.h"
-void extract_key(char *target, char *source, char *key) {
+void extract_key(char *target, char *source, char *key)
+{
int a, b;
strcpy(target, source);
- for (a=0; a<strlen(target); ++a) {
+ for (a = 0; a < strlen(target); ++a) {
if ((!strncasecmp(&target[a], key, strlen(key)))
- && (target[a+strlen(key)]=='=')) {
- strcpy(target, &target[a+strlen(key)+1]);
- if (target[0]==34) strcpy(target, &target[1]);
- for (b=0; b<strlen(target); ++b)
- if (target[b]==34) target[b]=0;
+ && (target[a + strlen(key)] == '=')) {
+ strcpy(target, &target[a + strlen(key) + 1]);
+ if (target[0] == 34)
+ strcpy(target, &target[1]);
+ for (b = 0; b < strlen(target); ++b)
+ if (target[b] == 34)
+ target[b] = 0;
return;
- }
}
- strcpy(target, "");
}
+ strcpy(target, "");
+}
+/*
+ * For non-multipart messages, we need to generate a quickie partnum of "1"
+ * to return to callback functions. Some callbacks demand it.
+ */
+char *fixed_partnum(char *supplied_partnum) {
+ if (supplied_partnum == NULL) return "1";
+ if (strlen(supplied_partnum)==0) return "1";
+ return supplied_partnum;
+}
- /**** OTHERWISE, HERE'S WHERE WE HANDLE THE STUFF!! *****
- CallBack(name, filename, "", content, content_type, length);
- **** END OF STUFF-HANDLER ****/
+/*
+ * Convert "quoted-printable" to binary. Returns number of bytes decoded.
+ */
+int CtdlDecodeQuotedPrintable(char *decoded, char *encoded, int sourcelen) {
+ char buf[SIZ];
+ int buf_length = 0;
+ int soft_line_break = 0;
+ unsigned int ch;
+ int decoded_length = 0;
+ int i;
+ decoded[0] = 0;
+ decoded_length = 0;
+ buf[0] = 0;
+ buf_length = 0;
-/*
- * Utility function to "readline" from memory
- * (returns new pointer)
- */
-char *memreadline(char *start, char *buf, int maxlen) {
- char ch;
- char *ptr;
+ for (i = 0; i < sourcelen; ++i) {
+
+ buf[buf_length++] = encoded[i];
+
+ if ( (encoded[i] == '\n')
+ || (encoded[i] == 0)
+ || (i == (sourcelen-1)) ) {
+ buf[buf_length++] = 0;
- ptr = start;
- bzero(buf, maxlen);
+ /*** begin -- process one line ***/
- while(1) {
- ch = *ptr++;
- if ((ch==10)||(ch==0)) {
- if (strlen(buf)>0)
- if (buf[strlen(buf)-1]==13)
- buf[strlen(buf)-1] = 0;
- return ptr;
+ if (buf[strlen(buf)-1] == '\n') {
+ buf[strlen(buf)-1] = 0;
}
- if (strlen(buf) < (maxlen-1)) {
- buf[strlen(buf)+1] = 0;
- buf[strlen(buf)] = ch;
+ if (buf[strlen(buf)-1] == '\r') {
+ buf[strlen(buf)-1] = 0;
+ }
+ while (isspace(buf[strlen(buf)-1])) {
+ buf[strlen(buf)-1] = 0;
+ }
+ soft_line_break = 0;
+
+ while (strlen(buf) > 0) {
+ if (!strcmp(buf, "=")) {
+ soft_line_break = 1;
+ strcpy(buf, "");
+ } else if ((strlen(buf)>=3) && (buf[0]=='=')) {
+ sscanf(&buf[1], "%02x", &ch);
+ decoded[decoded_length++] = ch;
+ strcpy(buf, &buf[3]);
+ } else {
+ decoded[decoded_length++] = buf[0];
+ strcpy(buf, &buf[1]);
+ }
}
+ if (soft_line_break == 0) {
+ decoded[decoded_length++] = '\r';
+ decoded[decoded_length++] = '\n';
+ }
+ buf_length = 0;
+ /*** end -- process one line ***/
}
}
+ decoded[decoded_length++] = 0;
+ return(decoded_length);
+}
+
+/*
+ * Given a message or message-part body and a length, handle any necessary
+ * decoding and pass the request up the stack.
+ */
+void mime_decode(char *partnum,
+ char *part_start, size_t length,
+ char *content_type, char *charset, char *encoding,
+ char *disposition,
+ char *name, char *filename,
+ void (*CallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ char *cbcharset,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+ void (*PreMultiPartCallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ char *cbcharset,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+ void (*PostMultiPartCallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ char *cbcharset,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+ void *userdata,
+ int dont_decode
+)
+{
+
+ char *decoded;
+ size_t bytes_decoded = 0;
+ /* Some encodings aren't really encodings */
+ if (!strcasecmp(encoding, "7bit"))
+ strcpy(encoding, "");
+ if (!strcasecmp(encoding, "8bit"))
+ strcpy(encoding, "");
+ if (!strcasecmp(encoding, "binary"))
+ strcpy(encoding, "");
+
+ /* If this part is not encoded, send as-is */
+ if ( (strlen(encoding) == 0) || (dont_decode)) {
+ if (CallBack != NULL) {
+ CallBack(name, filename, fixed_partnum(partnum),
+ disposition, part_start,
+ content_type, charset, length, encoding, userdata);
+ }
+ return;
+ }
+
+ if ((strcasecmp(encoding, "base64"))
+ && (strcasecmp(encoding, "quoted-printable"))) {
+ return;
+ }
+ /*
+ * Allocate a buffer for the decoded data. The output buffer is the
+ * same size as the input buffer; this assumes that the decoded data
+ * will never be larger than the encoded data. This is a safe
+ * assumption with base64, uuencode, and quoted-printable.
+ */
+ decoded = malloc(length+2048);
+ if (decoded == NULL) {
+ return;
+ }
+
+ if (!strcasecmp(encoding, "base64")) {
+ bytes_decoded = CtdlDecodeBase64(decoded, part_start, length);
+ }
+ else if (!strcasecmp(encoding, "quoted-printable")) {
+ bytes_decoded = CtdlDecodeQuotedPrintable(decoded,
+ part_start, length);
+ }
+
+ if (bytes_decoded > 0) if (CallBack != NULL) {
+ CallBack(name, filename, fixed_partnum(partnum),
+ disposition, decoded,
+ content_type, charset, bytes_decoded, "binary", userdata);
+ }
+
+ free(decoded);
+}
/*
* Break out the components of a multipart message
* (This function expects to be fed HEADERS + CONTENT)
+ * Note: NULL can be supplied as content_end; in this case, the message is
+ * considered to have ended when the parser encounters a 0x00 byte.
*/
-void mime_parser(char *content,
- void (*CallBack)
- (char *cbname,
- char *cbfilename,
- char *cbencoding,
- void *cbcontent,
- char *cbtype,
- size_t cblength)
- ) {
+void the_mime_parser(char *partnum,
+ char *content_start, char *content_end,
+ void (*CallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ char *cbcharset,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+ void (*PreMultiPartCallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ char *cbcharset,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+ void (*PostMultiPartCallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ char *cbcharset,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+ void *userdata,
+ int dont_decode
+)
+{
char *ptr;
- char *part_start, *part_end;
- char buf[256];
- char header[256];
- char boundary[256];
- char content_type[256];
- char encoding[256];
- int content_length;
+ char *srch = NULL;
+ char *part_start, *part_end = NULL;
+ char buf[SIZ];
+ char *header;
+ char *boundary;
+ char *startary;
+ size_t startary_len = 0;
+ char *endary;
+ char *next_boundary;
+ char *content_type;
+ char *charset;
+ size_t content_length;
+ char *encoding;
+ char *disposition;
+ char *name = NULL;
+ char *content_type_name;
+ char *content_disposition_name;
+ char *filename;
+ int is_multipart;
+ int part_seq = 0;
int i;
+ size_t length;
+ char nested_partnum[SIZ];
- ptr = content;
- bzero(boundary, sizeof boundary);
- bzero(content_type, sizeof content_type);
- bzero(encoding, sizeof encoding);
+ ptr = content_start;
content_length = 0;
+ boundary = malloc(SIZ);
+ memset(boundary, 0, SIZ);
+
+ startary = malloc(SIZ);
+ memset(startary, 0, SIZ);
+
+ endary = malloc(SIZ);
+ memset(endary, 0, SIZ);
+
+ header = malloc(SIZ);
+ memset(header, 0, SIZ);
+
+ content_type = malloc(SIZ);
+ memset(content_type, 0, SIZ);
+
+ charset = malloc(SIZ);
+ memset(charset, 0, SIZ);
+
+ encoding = malloc(SIZ);
+ memset(encoding, 0, SIZ);
+
+ content_type_name = malloc(SIZ);
+ memset(content_type_name, 0, SIZ);
+
+ content_disposition_name = malloc(SIZ);
+ memset(content_disposition_name, 0, SIZ);
+
+ filename = malloc(SIZ);
+ memset(filename, 0, SIZ);
+
+ disposition = malloc(SIZ);
+ memset(disposition, 0, SIZ);
+
+ /* If the caller didn't supply an endpointer, generate one by measure */
+ if (content_end == NULL) {
+ content_end = &content_start[strlen(content_start)];
+ }
+
/* Learn interesting things from the headers */
strcpy(header, "");
do {
- ptr = memreadline(ptr, buf, sizeof buf);
- for (i=0; i<strlen(buf); ++i)
- if (isspace(buf[i])) buf[i]=' ';
+ ptr = memreadline(ptr, buf, SIZ);
+ if (ptr >= content_end) {
+ goto end_parser;
+ }
+
+ for (i = 0; i < strlen(buf); ++i) {
+ if (isspace(buf[i])) {
+ buf[i] = ' ';
+ }
+ }
+
if (!isspace(buf[0])) {
- if (!strncasecmp(header, "Content-type: ", 14))
+ if (!strncasecmp(header, "Content-type: ", 14)) {
strcpy(content_type, &header[14]);
- if (!strncasecmp(header, "Content-length: ", 16))
- content_length = atoi(&header[16]);
+ extract_key(content_type_name, content_type, "name");
+ extract_key(charset, content_type, "charset");
+ /* Deal with weird headers */
+ if (strchr(content_type, ' '))
+ *(strchr(content_type, ' ')) = '\0';
+ if (strchr(content_type, ';'))
+ *(strchr(content_type, ';')) = '\0';
+ }
+ if (!strncasecmp(header, "Content-Disposition: ", 21)) {
+ strcpy(disposition, &header[21]);
+ extract_key(content_disposition_name, disposition, "name");
+ extract_key(filename, disposition, "filename");
+ }
+ if (!strncasecmp(header, "Content-length: ", 16)) {
+ content_length = (size_t) atol(&header[16]);
+ }
if (!strncasecmp(header,
- "Content-transfer-encoding: ", 27))
- strcpy(encoding, &header[27]);
- if (strlen(boundary)==0)
+ "Content-transfer-encoding: ", 27))
+ strcpy(encoding, &header[27]);
+ if (strlen(boundary) == 0)
extract_key(boundary, header, "boundary");
strcpy(header, "");
- }
- if ((strlen(header)+strlen(buf)+2)<sizeof(header))
+ }
+ if ((strlen(header) + strlen(buf) + 2) < SIZ)
strcat(header, buf);
- } while ((strlen(buf) > 0) && (*ptr != 0));
+ } while ((strlen(buf) > 0) && (*ptr != 0));
- cprintf("Content type is <%s>\n", content_type);
- cprintf("Encoding is <%s>\n", encoding);
- cprintf("Content length is %d\n", content_length);
- cprintf("Boundary is <%s>\n", boundary);
+ if (strchr(disposition, ';'))
+ *(strchr(disposition, ';')) = '\0';
+ striplt(disposition);
+ if (strchr(content_type, ';'))
+ *(strchr(content_type, ';')) = '\0';
+ striplt(content_type);
- if (*ptr == 0) return; /* premature end of message */
+ if (strlen(boundary) > 0) {
+ is_multipart = 1;
+ } else {
+ is_multipart = 0;
+ }
/* If this is a multipart message, then recursively process it */
- if (strlen(boundary)>0) {
+ part_start = NULL;
+ if (is_multipart) {
+
+ /* Tell the client about this message's multipartedness */
+ if (PreMultiPartCallBack != NULL) {
+ PreMultiPartCallBack("", "", partnum, "",
+ NULL, content_type, charset,
+ 0, encoding, userdata);
+ }
+
+ /* Figure out where the boundaries are */
+ snprintf(startary, SIZ, "--%s", boundary);
+ snprintf(endary, SIZ, "--%s--", boundary);
+ startary_len = strlen(startary);
+
+ part_start = NULL;
+ do {
+ next_boundary = NULL;
+ for (srch=ptr; srch<content_end; ++srch) {
+ if (!memcmp(srch, startary, startary_len)) {
+ next_boundary = srch;
+ srch = content_end;
+ }
+ }
+
+ if ( (part_start != NULL) && (next_boundary != NULL) ) {
+ part_end = next_boundary;
+ --part_end;
+
+ if (strlen(partnum) > 0) {
+ snprintf(nested_partnum,
+ sizeof nested_partnum,
+ "%s.%d", partnum,
+ ++part_seq);
+ }
+ else {
+ snprintf(nested_partnum,
+ sizeof nested_partnum,
+ "%d", ++part_seq);
+ }
+ the_mime_parser(nested_partnum,
+ part_start, part_end,
+ CallBack,
+ PreMultiPartCallBack,
+ PostMultiPartCallBack,
+ userdata,
+ dont_decode);
+ }
+
+ if (next_boundary != NULL) {
+ /* If we pass out of scope, don't attempt to
+ * read past the end boundary. */
+ if (!strcmp(next_boundary, endary)) {
+ ptr = content_end;
+ }
+ else {
+ /* Set up for the next part. */
+ part_start = strstr(next_boundary, "\n");
+ ++part_start;
+ ptr = part_start;
+ }
+ }
+ else {
+ /* Invalid end of multipart. Bail out! */
+ ptr = content_end;
+ }
+ } while ( (ptr < content_end) && (next_boundary != NULL) );
+
+ if (PostMultiPartCallBack != NULL) {
+ PostMultiPartCallBack("", "", partnum, "", NULL,
+ content_type, charset, 0, encoding, userdata);
+ }
+ goto end_parser;
+ }
+
+ /* If it's not a multipart message, then do something with it */
+ if (!is_multipart) {
+ part_start = ptr;
+ length = 0;
+ while (ptr < content_end) {
+ ++ptr;
+ ++length;
+ }
+ part_end = content_end;
+ /* fix an off-by-one error */
+ --part_end;
+ --length;
+
+ /* Truncate if the header told us to */
+ if ( (content_length > 0) && (length > content_length) ) {
+ length = content_length;
+ }
+
+ /* Sometimes the "name" field is tacked on to Content-type,
+ * and sometimes it's tacked on to Content-disposition. Use
+ * whichever one we have.
+ */
+ if (strlen(content_disposition_name) > strlen(content_type_name)) {
+ name = content_disposition_name;
+ }
+ else {
+ name = content_type_name;
}
+ /* lprintf(CTDL_DEBUG, "mime_decode part=%s, len=%d, type=%s, charset=%s, encoding=%s\n",
+ partnum, length, content_type, charset, encoding); */
+ /* Ok, we've got a non-multipart part here, so do something with it.
+ */
+ mime_decode(partnum,
+ part_start, length,
+ content_type, charset, encoding, disposition,
+ name, filename,
+ CallBack, NULL, NULL,
+ userdata, dont_decode
+ );
}
+
+end_parser: /* free the buffers! end the oppression!! */
+ free(boundary);
+ free(startary);
+ free(endary);
+ free(header);
+ free(content_type);
+ free(charset);
+ free(encoding);
+ free(content_type_name);
+ free(content_disposition_name);
+ free(filename);
+ free(disposition);
+}
+
+
+
+/*
+ * Entry point for the MIME parser.
+ * (This function expects to be fed HEADERS + CONTENT)
+ * Note: NULL can be supplied as content_end; in this case, the message is
+ * considered to have ended when the parser encounters a 0x00 byte.
+ */
+void mime_parser(char *content_start,
+ char *content_end,
+
+ void (*CallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ char *cbcharset,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+
+ void (*PreMultiPartCallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ char *cbcharset,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+
+ void (*PostMultiPartCallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ char *cbcharset,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+
+ void *userdata,
+ int dont_decode
+)
+{
+
+ the_mime_parser("", content_start, content_end,
+ CallBack,
+ PreMultiPartCallBack,
+ PostMultiPartCallBack,
+ userdata, dont_decode);
+}
projects / citadel.git / blobdiff