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#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include "blaze822.h"
#include "blaze822_priv.h"
// needs to be writable
char textplain[] = "text/plain; charset=US-ASCII";
int
blaze822_check_mime(struct message *msg)
{
char *v = blaze822_hdr(msg, "mime-version");
if (v &&
v[0] && v[0] == '1' &&
v[1] && v[1] == '.' &&
v[2] && v[2] == '0' &&
(!v[3] || iswsp(v[3])))
return 1;
v = blaze822_hdr(msg, "content-transfer-encoding");
if (v)
return 1;
return 0;
}
int
blaze822_mime_body(struct message *msg,
char **cto, char **bodyo, size_t *bodyleno, char **bodychunko)
{
if (!msg->body || !msg->bodyend) {
*bodyo = 0;
*bodyleno = 0;
*bodychunko = 0;
return 0;
}
char *ct = blaze822_hdr(msg, "content-type");
char *cte = blaze822_hdr(msg, "content-transfer-encoding");
if (!ct)
ct = textplain;
char *s = ct;
while (*s && *s != ';') {
*s = lc(*s);
s++;
}
*cto = ct;
if (cte) {
if (strncasecmp(cte, "quoted-printable", 16) == 0) {
blaze822_decode_qp(msg->body, msg->bodyend, bodyo, bodyleno, 0);
*bodychunko = *bodyo;
} else if (strncasecmp(cte, "base64", 6) == 0) {
blaze822_decode_b64(msg->body, msg->bodyend, bodyo, bodyleno);
*bodychunko = *bodyo;
} else {
cte = 0;
}
}
if (!cte) {
*bodyo = msg->body;
*bodyleno = msg->bodyend - msg->body;
*bodychunko = 0;
}
return 1;
}
int
blaze822_mime_parameter(char *s, char *name, char **starto, char **stopo)
{
if (!s)
return 0;
s = strchr(s, ';');
if (!s)
return 0;
s++;
size_t namelen = strlen(name);
while (*s) {
while (iswsp(*s))
s++;
if (strncasecmp(s, name, namelen) == 0 && s[namelen] == '=') {
s += namelen + 1;
break;
}
s = strchr(s+1, ';');
if (!s)
return 0;
s++;
}
if (!s || !*s)
return 0;
char *e;
if (*s == '"') {
s++;
e = strchr(s, '"');
if (!e)
return 0;
} else {
e = s;
while (*e && !iswsp(*e) && *e != ';')
e++;
}
*starto = s;
*stopo = e;
return 1;
}
int
blaze822_multipart(struct message *msg, struct message **imsg)
{
char *s = blaze822_hdr(msg, "content-type");
if (!s)
return 0;
while (*s && *s != ';')
s++;
if (!*s)
return 0;
char *boundary, *boundaryend;
if (!blaze822_mime_parameter(s, "boundary", &boundary, &boundaryend))
return 0;
char mboundary[256];
size_t boundarylen = boundaryend-boundary+2;
if (boundarylen >= 256)
return 0;
mboundary[0] = '-';
mboundary[1] = '-';
memcpy(mboundary+2, boundary, boundarylen-2);
mboundary[boundarylen] = 0;
char *prevpart;
if (*imsg)
prevpart = (*imsg)->bodyend;
else
prevpart = msg->body;
char *part = mymemmem(prevpart, msg->bodyend - prevpart, mboundary, boundarylen);
if (!part)
return 0;
part += boundarylen;
if (*part == '\r')
part++;
if (*part == '\n')
part++;
else if (*part == '-' && part < msg->bodyend && *(part+1) == '-')
return 0;
else
return 0; // XXX error condition?
char *nextpart = mymemmem(part, msg->bodyend - part, mboundary, boundarylen);
if (!nextpart)
return 0; // XXX error condition
if (nextpart == part) // invalid empty MIME part
return 0; // XXX error condition
if (*(nextpart-1) == '\n')
nextpart--;
if (*(nextpart-1) == '\r')
nextpart--;
*imsg = blaze822_mem(part, nextpart-part);
return 1;
}
blaze822_mime_action
blaze822_walk_mime(struct message *msg, int depth, blaze822_mime_callback visit)
{
char *ct, *body, *bodychunk;
size_t bodylen;
blaze822_mime_action r = MIME_CONTINUE;
if (depth > 64)
return MIME_PRUNE;
if (blaze822_mime_body(msg, &ct, &body, &bodylen, &bodychunk)) {
r = visit(depth, msg, body, bodylen);
if (r == MIME_CONTINUE) {
if (strncmp(ct, "multipart/", 10) == 0) {
struct message *imsg = 0;
while (blaze822_multipart(msg, &imsg)) {
r = blaze822_walk_mime(imsg, depth+1, visit);
if (r == MIME_STOP)
break;
}
} else if (strncmp(ct, "message/rfc822", 14) == 0) {
struct message *imsg = blaze822_mem(body, bodylen);
if (imsg)
blaze822_walk_mime(imsg, depth+1, visit);
}
}
free(bodychunk);
}
return r;
}
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