/*
- * mime_parser.c
+ * $Id$
+ *
+ * This is the MIME parser brought over from the Citadel server source code.
+ * We use it to handle HTTP uploads, which are sent in MIME format. In the
+ * future we'll use it to output MIME messages as well.
+ *
+ * Copyright (c) 1998-2001 by Art Cancro
+ * This code is distributed under the terms of the GNU General Public License.
*
- * This is a really bad attempt at writing a parser to handle multipart
- * messages -- in the case of WebCit, a form containing uploaded files.
*/
-
-
-#include <ctype.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
-#include <fcntl.h>
#include <signal.h>
#include <sys/types.h>
-#include <sys/wait.h>
-#include <sys/socket.h>
-#include <sys/time.h>
-#include <limits.h>
-#include <netinet/in.h>
-#include <netdb.h>
+#include <ctype.h>
#include <string.h>
-#include <pwd.h>
+#include <sys/stat.h>
#include <errno.h>
-#include <stdarg.h>
-#include <pthread.h>
-#include <signal.h>
#include "webcit.h"
-
-
+#include "mime_parser.h"
-/*
- * The very back end for the component handler
- * (This function expects to be fed CONTENT ONLY, no headers)
+/*
+ * Utility function to "readline" from memory
+ * (returns new pointer)
*/
-void do_something_with_it(char *content,
- int length,
- char *content_type,
- char *content_disposition,
- void (*CallBack)
- (char *cbname,
- char *cbfilename,
- char *cbencoding,
- void *cbcontent,
- char *cbtype,
- size_t cblength)
-)
+char *memreadline(char *start, char *buf, int maxlen)
{
- char name[256];
- char filename[256];
+ char ch;
+ char *ptr;
+ int len = 0; /* tally our own length to avoid strlen() delays */
- extract_key(name, content_disposition, " name");
- extract_key(filename, content_disposition, "filename");
+ ptr = start;
+ memset(buf, 0, maxlen);
- /* Nested multipart gets recursively fed back into the parser */
- if (!strncasecmp(content_type, "multipart", 9)) {
- mime_parser(content, length, content_type, CallBack);
+ while (1) {
+ ch = *ptr++;
+ if ( (len < (maxlen - 1)) && (ch != 13) && (ch != 10) ) {
+ buf[strlen(buf) + 1] = 0;
+ buf[strlen(buf)] = ch;
+ ++len;
+ }
+ if ((ch == 10) || (ch == 0)) {
+ return ptr;
+ }
}
-/**** OTHERWISE, HERE'S WHERE WE HANDLE THE STUFF!! *****/
-
- CallBack(name, filename, "", content, content_type, length);
+}
-/**** END OF STUFF-HANDLER ****/
+/*
+ * 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;
}
/*
- * Take a part, figure out its length, and do something with it
- * (This function expects to be fed HEADERS+CONTENT)
+ * Given a message or message-part body and a length, handle any necessary
+ * decoding and pass the request up the stack.
*/
-void handle_part(char *content,
- int part_length,
- char *supplied_content_type,
+void mime_decode(char *partnum,
+ char *part_start, size_t length,
+ char *content_type, char *encoding,
+ char *disposition,
+ char *name, char *filename,
void (*CallBack)
(char *cbname,
char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ size_t cblength,
char *cbencoding,
+ void *cbuserdata),
+ void (*PreMultiPartCallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
void *cbcontent,
char *cbtype,
- size_t cblength)
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+ void (*PostMultiPartCallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+ void *userdata,
+ int dont_decode
)
{
- char content_type[256];
- char content_disposition[256];
- char *start;
- char buf[512];
- int crlf = 0; /* set to 1 for crlf-style newlines */
- int actual_length;
-
- strcpy(content_type, supplied_content_type);
-
- /* Strip off any leading blank lines. */
- start = content;
- while ((!strncmp(start, "\r", 1)) || (!strncmp(start, "\n", 1))) {
- ++start;
- --part_length;
+
+ char *decoded;
+ struct stat statbuf;
+ int sendpipe[2];
+ int recvpipe[2];
+ int childpid;
+ size_t bytes_sent = 0;
+ size_t bytes_recv = 0;
+ size_t blocksize;
+ int write_error = 0;
+
+ fprintf(stderr, "mime_decode() called\n");
+
+ /* 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, length, encoding, userdata);
+ }
+ return;
+ }
+ if ((strcasecmp(encoding, "base64"))
+ && (strcasecmp(encoding, "quoted-printable"))) {
+ fprintf(stderr, "ERROR: unknown MIME encoding '%s'\n", encoding);
+ 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. Just to
+ * be safe, we still pad the buffer a bit.
+ */
+ decoded = malloc(length + 1024);
+ if (decoded == NULL) {
+ fprintf(stderr, "ERROR: cannot allocate memory.\n");
+ return;
+ }
+ if (pipe(sendpipe) != 0)
+ return;
+ if (pipe(recvpipe) != 0)
+ return;
+
+ childpid = fork();
+ if (childpid < 0) {
+ free(decoded);
+ return;
+ }
+ if (childpid == 0) {
+ close(2);
+ /* send stdio to the pipes */
+ if (dup2(sendpipe[0], 0) < 0)
+ fprintf(stderr, "ERROR dup2()\n");
+ if (dup2(recvpipe[1], 1) < 0)
+ fprintf(stderr, "ERROR dup2()\n");
+ close(sendpipe[1]); /* Close the ends we're not using */
+ close(recvpipe[0]);
+ if (!strcasecmp(encoding, "base64"))
+ execlp("./base64", "base64", "-d", NULL);
+ else if (!strcasecmp(encoding, "quoted-printable"))
+ execlp("./qpdecode", "qpdecode", NULL);
+ fprintf(stderr, "ERROR: cannot exec decoder for %s\n", encoding);
+ exit(1);
+ }
+ close(sendpipe[0]); /* Close the ends we're not using */
+ close(recvpipe[1]);
+
+ while ((bytes_sent < length) && (write_error == 0)) {
+ /* Empty the input pipe FIRST */
+ while (fstat(recvpipe[0], &statbuf), (statbuf.st_size > 0)) {
+ blocksize = read(recvpipe[0], &decoded[bytes_recv],
+ statbuf.st_size);
+ if (blocksize < 0)
+ fprintf(stderr, "ERROR: cannot read from pipe\n");
+ else
+ bytes_recv = bytes_recv + blocksize;
+ }
+ /* Then put some data into the output pipe */
+ blocksize = length - bytes_sent;
+ if (blocksize > 2048)
+ blocksize = 2048;
+ if (write(sendpipe[1], &part_start[bytes_sent], blocksize) < 0) {
+ fprintf(stderr, "ERROR: cannot write to pipe: %s\n",
+ strerror(errno));
+ write_error = 1;
+ }
+ bytes_sent = bytes_sent + blocksize;
+ }
+ close(sendpipe[1]);
+ /* Empty the input pipe */
+ while ((blocksize = read(recvpipe[0], &decoded[bytes_recv], 1)),
+ (blocksize > 0)) {
+ bytes_recv = bytes_recv + blocksize;
}
- /* At this point all we have left is the headers and the content. */
+ if (bytes_recv > 0) if (CallBack != NULL) {
+ CallBack(name, filename, fixed_partnum(partnum),
+ disposition, decoded,
+ content_type, bytes_recv, "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 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,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+ void (*PreMultiPartCallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+ void (*PostMultiPartCallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
+ void *userdata,
+ int dont_decode
+)
+{
+
+ char *ptr;
+ char *part_start, *part_end;
+ char buf[SIZ];
+ char header[SIZ];
+ char boundary[SIZ];
+ char startary[SIZ];
+ char endary[SIZ];
+ char content_type[SIZ];
+ char encoding[SIZ];
+ char disposition[SIZ];
+ char name[SIZ];
+ char filename[SIZ];
+ int is_multipart;
+ int part_seq = 0;
+ int i;
+ size_t length;
+ char nested_partnum[SIZ];
+
+ fprintf(stderr, "the_mime_parser() called\n");
+ ptr = content_start;
+ memset(boundary, 0, sizeof boundary);
+ memset(content_type, 0, sizeof content_type);
+ memset(encoding, 0, sizeof encoding);
+ memset(name, 0, sizeof name);
+ memset(filename, 0, sizeof filename);
+ memset(disposition, 0, sizeof disposition);
+
+ /* Learn interesting things from the headers */
+ strcpy(header, "");
do {
- strcpy(buf, "");
- do {
- buf[strlen(buf) + 1] = 0;
- if (strlen(buf) < ((sizeof buf) - 1)) {
- strncpy(&buf[strlen(buf)], start, 1);
+ ptr = memreadline(ptr, buf, sizeof buf);
+ if (*ptr == 0)
+ return; /* premature end of message */
+ if (content_end != NULL)
+ if (ptr >= content_end)
+ return;
+
+ for (i = 0; i < strlen(buf); ++i)
+ if (isspace(buf[i]))
+ buf[i] = ' ';
+ if (!isspace(buf[0])) {
+ if (!strncasecmp(header, "Content-type: ", 14)) {
+ strcpy(content_type, &header[14]);
+ extract_key(name, content_type, "name");
}
- ++start;
- --part_length;
- } while ((buf[strlen(buf) - 1] != 10) && (part_length > 0));
- if (part_length <= 0)
- return;
- buf[strlen(buf) - 1] = 0;
- if (buf[strlen(buf) - 1] == 13) {
- buf[strlen(buf) - 1] = 0;
- crlf = 1;
+ if (!strncasecmp(header, "Content-Disposition: ", 21)) {
+ strcpy(disposition, &header[21]);
+ extract_key(filename, disposition, "filename");
+ }
+ if (!strncasecmp(header,
+ "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))
+ strcat(header, buf);
+ } while ((strlen(buf) > 0) && (*ptr != 0));
+
+ for (i = 0; i < strlen(disposition); ++i)
+ if (disposition[i] == ';')
+ disposition[i] = 0;
+ while (isspace(disposition[0]))
+ strcpy(disposition, &disposition[1]);
+ for (i = 0; i < strlen(content_type); ++i)
+ if (content_type[i] == ';')
+ content_type[i] = 0;
+ while (isspace(content_type[0]))
+ strcpy(content_type, &content_type[1]);
+
+ if (strlen(boundary) > 0) {
+ is_multipart = 1;
+ } else {
+ is_multipart = 0;
+ }
+
+ /* If this is a multipart message, then recursively process it */
+ part_start = NULL;
+ if (is_multipart) {
+
+ /* Tell the client about this message's multipartedness */
+ if (PreMultiPartCallBack != NULL) {
+ PreMultiPartCallBack("", "", partnum, "",
+ NULL, content_type,
+ 0, encoding, userdata);
}
- if (!strncasecmp(buf, "Content-type: ", 14)) {
- strcpy(content_type, &buf[14]);
+ /*
+ if (CallBack != NULL) {
+ CallBack("", "", fixed_partnum(partnum),
+ "", NULL, content_type,
+ 0, encoding, userdata);
}
- if (!strncasecmp(buf, "Content-disposition: ", 21)) {
- strcpy(content_disposition, &buf[21]);
+ */
+
+ /* Figure out where the boundaries are */
+ sprintf(startary, "--%s", boundary);
+ sprintf(endary, "--%s--", boundary);
+ do {
+ part_end = ptr;
+ ptr = memreadline(ptr, buf, sizeof buf);
+ if (content_end != NULL)
+ if (ptr >= content_end) goto END_MULTI;
+
+ if ( (!strcasecmp(buf, startary))
+ || (!strcasecmp(buf, endary)) ) {
+ if (part_start != NULL) {
+ if (strlen(partnum) > 0) {
+ sprintf(nested_partnum, "%s.%d",
+ partnum, ++part_seq);
+ }
+ else {
+ sprintf(nested_partnum, "%d",
+ ++part_seq);
+ }
+ the_mime_parser(nested_partnum,
+ part_start, part_end,
+ CallBack,
+ PreMultiPartCallBack,
+ PostMultiPartCallBack,
+ userdata,
+ dont_decode);
+ }
+ part_start = ptr;
+ }
+ } while ( (strcasecmp(buf, endary)) && (ptr != 0) );
+END_MULTI: if (PostMultiPartCallBack != NULL) {
+ PostMultiPartCallBack("", "", partnum, "", NULL,
+ content_type, 0, encoding, userdata);
}
- } while (strlen(buf) > 0);
+ return;
+ }
- if (crlf)
- actual_length = part_length - 2;
- else
- actual_length = part_length - 1;
+ /* If it's not a multipart message, then do something with it */
+ if (!is_multipart) {
+ part_start = ptr;
+ length = 0;
+ while ((*ptr != 0)
+ && ((content_end == NULL) || (ptr < content_end))) {
+ ++length;
+ part_end = ptr++;
+ }
+ mime_decode(partnum,
+ part_start, length,
+ content_type, encoding, disposition,
+ name, filename,
+ CallBack, NULL, NULL,
+ userdata, dont_decode);
+ }
- /* Now that we've got this component isolated, what to do with it? */
- do_something_with_it(start, actual_length,
- content_type, content_disposition, CallBack);
}
+
/*
- * Break out the components of a multipart message
- * (This function expects to be fed CONTENT ONLY, no headers)
+ * 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 mime_parser(char *content,
- int ContentLength,
- char *ContentType,
void (*CallBack)
(char *cbname,
char *cbfilename,
- char *cbencoding,
+ char *cbpartnum,
+ char *cbdisp,
void *cbcontent,
char *cbtype,
- size_t cblength)
-)
-{
- char boundary[256];
- char endary[256];
- int have_boundary = 0;
- int a;
- char *ptr;
- char *beginning;
- int bytes_processed = 0;
- int part_length;
-
- /* If it's not multipart, don't process it as multipart */
- if (strncasecmp(ContentType, "multipart", 9)) {
- do_something_with_it(content, ContentLength,
- ContentType, "", CallBack);
- return;
- }
- /* Figure out what the boundary is */
- strcpy(boundary, ContentType);
- for (a = 0; a < strlen(boundary); ++a) {
- if (!strncasecmp(&boundary[a], "boundary=", 9)) {
- boundary[0] = '-';
- boundary[1] = '-';
- strcpy(&boundary[2], &boundary[a + 9]);
- have_boundary = 1;
- a = 0;
- }
- if ((boundary[a] == 13) || (boundary[a] == 10)) {
- boundary[a] = 0;
- }
- }
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
- /* We can't process multipart messages without a boundary. */
- if (have_boundary == 0)
- return;
- strcpy(endary, boundary);
- strcat(endary, "--");
+ void (*PreMultiPartCallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
- ptr = content;
+ void (*PostMultiPartCallBack)
+ (char *cbname,
+ char *cbfilename,
+ char *cbpartnum,
+ char *cbdisp,
+ void *cbcontent,
+ char *cbtype,
+ size_t cblength,
+ char *cbencoding,
+ void *cbuserdata),
- /* Seek to the beginning of the next boundary */
- while (bytes_processed < ContentLength) {
- /* && (strncasecmp(ptr, boundary, strlen(boundary))) ) { */
+ void *userdata,
+ int dont_decode
+)
+{
- if (strncasecmp(ptr, boundary, strlen(boundary))) {
- ++ptr;
- ++bytes_processed;
- }
- /* See if we're at the end */
- if (!strncasecmp(ptr, endary, strlen(endary))) {
- return;
- }
- /* Seek to the end of the boundary string */
- if (!strncasecmp(ptr, boundary, strlen(boundary))) {
- while ((bytes_processed < ContentLength)
- && (strncasecmp(ptr, "\n", 1))) {
- ++ptr;
- ++bytes_processed;
- }
- beginning = ptr;
- part_length = 0;
- while ((bytes_processed < ContentLength)
- && (strncasecmp(ptr, boundary, strlen(boundary)))) {
- ++ptr;
- ++bytes_processed;
- ++part_length;
- }
- handle_part(beginning, part_length, "", CallBack);
- /* Back off so we can see the next boundary */
- --ptr;
- --bytes_processed;
- }
- }
+ fprintf(stderr, "mime_parser() called\n");
+ the_mime_parser("", content_start, content_end,
+ CallBack,
+ PreMultiPartCallBack,
+ PostMultiPartCallBack,
+ userdata, dont_decode);
}
projects / citadel.git / commitdiff