/* * mhparse.c -- routines to parse the contents of MIME messages * * This code is Copyright (c) 2002, by the authors of nmh. See the * COPYRIGHT file in the root directory of the nmh distribution for * complete copyright information. */ #include #include #include #include #include #include #include #include #include #include #include extern int debugsw; extern pid_t xpid; /* mhshowsbr.c */ /* cache policies */ extern int rcachesw; /* mhcachesbr.c */ extern int wcachesw; /* mhcachesbr.c */ int checksw = 0; /* check Content-MD5 field */ /* * Directory to place temp files. This must * be set before these routines are called. */ char *tmp; /* * Structures for TEXT messages */ struct k2v SubText[] = { { "plain", TEXT_PLAIN }, { "richtext", TEXT_RICHTEXT }, /* defined in RFC-1341 */ { "enriched", TEXT_ENRICHED }, /* defined in RFC-1896 */ { NULL, TEXT_UNKNOWN } /* this one must be last! */ }; /* Charset[] removed -- yozo. Mon Oct 8 01:03:41 JST 2012 */ /* * Structures for MULTIPART messages */ struct k2v SubMultiPart[] = { { "mixed", MULTI_MIXED }, { "alternative", MULTI_ALTERNATE }, { "digest", MULTI_DIGEST }, { "parallel", MULTI_PARALLEL }, { NULL, MULTI_UNKNOWN } /* this one must be last! */ }; /* * Structures for MESSAGE messages */ struct k2v SubMessage[] = { { "rfc822", MESSAGE_RFC822 }, { "partial", MESSAGE_PARTIAL }, { "external-body", MESSAGE_EXTERNAL }, { NULL, MESSAGE_UNKNOWN } /* this one must be last! */ }; /* * Structure for APPLICATION messages */ struct k2v SubApplication[] = { { "octet-stream", APPLICATION_OCTETS }, { "postscript", APPLICATION_POSTSCRIPT }, { NULL, APPLICATION_UNKNOWN } /* this one must be last! */ }; /* mhcachesbr.c */ int find_cache (CT, int, int *, char *, char *, int); /* mhmisc.c */ int part_ok (CT, int); int type_ok (CT, int); void content_error (char *, CT, char *, ...); /* mhfree.c */ void free_content (CT); void free_encoding (CT, int); /* * static prototypes */ static CT get_content (FILE *, char *, int); static int get_comment (CT, unsigned char **, int); static int InitGeneric (CT); static int InitText (CT); static int InitMultiPart (CT); static void reverse_parts (CT); static int InitMessage (CT); static int InitApplication (CT); static int init_encoding (CT, OpenCEFunc); static unsigned long size_encoding (CT); static int InitBase64 (CT); static int openBase64 (CT, char **); static int InitQuoted (CT); static int openQuoted (CT, char **); static int Init7Bit (CT); static int openExternal (CT, CT, CE, char **, int *); static int InitFile (CT); static int openFile (CT, char **); static int InitFTP (CT); static int openFTP (CT, char **); static int InitMail (CT); static int openMail (CT, char **); static int readDigest (CT, char *); struct str2init str2cts[] = { { "application", CT_APPLICATION, InitApplication }, { "audio", CT_AUDIO, InitGeneric }, { "image", CT_IMAGE, InitGeneric }, { "message", CT_MESSAGE, InitMessage }, { "multipart", CT_MULTIPART, InitMultiPart }, { "text", CT_TEXT, InitText }, { "video", CT_VIDEO, InitGeneric }, { NULL, CT_EXTENSION, NULL }, /* these two must be last! */ { NULL, CT_UNKNOWN, NULL }, }; struct str2init str2ces[] = { { "base64", CE_BASE64, InitBase64 }, { "quoted-printable", CE_QUOTED, InitQuoted }, { "8bit", CE_8BIT, Init7Bit }, { "7bit", CE_7BIT, Init7Bit }, { "binary", CE_BINARY, Init7Bit }, { NULL, CE_EXTENSION, NULL }, /* these two must be last! */ { NULL, CE_UNKNOWN, NULL }, }; /* * NOTE WELL: si_key MUST NOT have value of NOTOK * * si_key is 1 if access method is anonymous. */ struct str2init str2methods[] = { { "afs", 1, InitFile }, { "anon-ftp", 1, InitFTP }, { "ftp", 0, InitFTP }, { "local-file", 0, InitFile }, { "mail-server", 0, InitMail }, { NULL, 0, NULL } }; int pidcheck (int status) { if ((status & 0xff00) == 0xff00 || (status & 0x007f) != SIGQUIT) return status; fflush (stdout); fflush (stderr); done (1); return 1; } /* * Main entry point for parsing a MIME message or file. * It returns the Content structure for the top level * entity in the file. */ CT parse_mime (char *file) { int is_stdin; char buffer[BUFSIZ]; FILE *fp; CT ct; /* * Check if file is actually standard input */ if ((is_stdin = !(strcmp (file, "-")))) { char *tfile = m_mktemp2(NULL, invo_name, NULL, &fp); if (tfile == NULL) { advise("mhparse", "unable to create temporary file"); return NULL; } file = add (tfile, NULL); chmod (file, 0600); while (fgets (buffer, sizeof(buffer), stdin)) fputs (buffer, fp); fflush (fp); if (ferror (stdin)) { unlink (file); advise ("stdin", "error reading"); return NULL; } if (ferror (fp)) { unlink (file); advise (file, "error writing"); return NULL; } fseek (fp, 0L, SEEK_SET); } else if ((fp = fopen (file, "r")) == NULL) { advise (file, "unable to read"); return NULL; } if (!(ct = get_content (fp, file, 1))) { if (is_stdin) unlink (file); advise (NULL, "unable to decode %s", file); return NULL; } if (is_stdin) ct->c_unlink = 1; /* temp file to remove */ ct->c_fp = NULL; if (ct->c_end == 0L) { fseek (fp, 0L, SEEK_END); ct->c_end = ftell (fp); } if (ct->c_ctinitfnx && (*ct->c_ctinitfnx) (ct) == NOTOK) { fclose (fp); free_content (ct); return NULL; } fclose (fp); return ct; } /* * Main routine for reading/parsing the headers * of a message content. * * toplevel = 1 # we are at the top level of the message * toplevel = 0 # we are inside message type or multipart type * # other than multipart/digest * toplevel = -1 # we are inside multipart/digest * NB: on failure we will fclose(in)! */ static CT get_content (FILE *in, char *file, int toplevel) { int compnum, state; char buf[BUFSIZ], name[NAMESZ]; char *np, *vp; CT ct; HF hp; /* allocate the content structure */ if (!(ct = (CT) calloc (1, sizeof(*ct)))) adios (NULL, "out of memory"); ct->c_fp = in; ct->c_file = add (file, NULL); ct->c_begin = ftell (ct->c_fp) + 1; /* * Parse the header fields for this * content into a linked list. */ for (compnum = 1, state = FLD;;) { switch (state = m_getfld (state, name, buf, sizeof(buf), in)) { case FLD: case FLDPLUS: case FLDEOF: compnum++; /* get copies of the buffers */ np = add (name, NULL); vp = add (buf, NULL); /* if necessary, get rest of field */ while (state == FLDPLUS) { state = m_getfld (state, name, buf, sizeof(buf), in); vp = add (buf, vp); /* add to previous value */ } /* Now add the header data to the list */ add_header (ct, np, vp); /* continue, if this isn't the last header field */ if (state != FLDEOF) { ct->c_begin = ftell (in) + 1; continue; } /* else fall... */ case BODY: case BODYEOF: ct->c_begin = ftell (in) - strlen (buf); break; case FILEEOF: ct->c_begin = ftell (in); break; case LENERR: case FMTERR: adios (NULL, "message format error in component #%d", compnum); default: adios (NULL, "getfld() returned %d", state); } /* break out of the loop */ break; } /* * Read the content headers. We will parse the * MIME related header fields into their various * structures and set internal flags related to * content type/subtype, etc. */ hp = ct->c_first_hf; /* start at first header field */ while (hp) { /* Get MIME-Version field */ if (!mh_strcasecmp (hp->name, VRSN_FIELD)) { int ucmp; char c; unsigned char *cp, *dp; if (ct->c_vrsn) { advise (NULL, "message %s has multiple %s: fields", ct->c_file, VRSN_FIELD); goto next_header; } ct->c_vrsn = add (hp->value, NULL); /* Now, cleanup this field */ cp = ct->c_vrsn; while (isspace (*cp)) cp++; for (dp = strchr(cp, '\n'); dp; dp = strchr(dp, '\n')) *dp++ = ' '; for (dp = cp + strlen (cp) - 1; dp >= cp; dp--) if (!isspace (*dp)) break; *++dp = '\0'; if (debugsw) fprintf (stderr, "%s: %s\n", VRSN_FIELD, cp); if (*cp == '(' && get_comment (ct, &cp, 0) == NOTOK) goto out; for (dp = cp; istoken (*dp); dp++) continue; c = *dp; *dp = '\0'; ucmp = !mh_strcasecmp (cp, VRSN_VALUE); *dp = c; if (!ucmp) { admonish (NULL, "message %s has unknown value for %s: field (%s)", ct->c_file, VRSN_FIELD, cp); } } else if (!mh_strcasecmp (hp->name, TYPE_FIELD)) { /* Get Content-Type field */ struct str2init *s2i; CI ci = &ct->c_ctinfo; /* Check if we've already seen a Content-Type header */ if (ct->c_ctline) { advise (NULL, "message %s has multiple %s: fields", ct->c_file, TYPE_FIELD); goto next_header; } /* Parse the Content-Type field */ if (get_ctinfo (hp->value, ct, 0) == NOTOK) goto out; /* * Set the Init function and the internal * flag for this content type. */ for (s2i = str2cts; s2i->si_key; s2i++) if (!mh_strcasecmp (ci->ci_type, s2i->si_key)) break; if (!s2i->si_key && !uprf (ci->ci_type, "X-")) s2i++; ct->c_type = s2i->si_val; ct->c_ctinitfnx = s2i->si_init; } else if (!mh_strcasecmp (hp->name, ENCODING_FIELD)) { /* Get Content-Transfer-Encoding field */ char c; unsigned char *cp, *dp; struct str2init *s2i; /* * Check if we've already seen the * Content-Transfer-Encoding field */ if (ct->c_celine) { advise (NULL, "message %s has multiple %s: fields", ct->c_file, ENCODING_FIELD); goto next_header; } /* get copy of this field */ ct->c_celine = cp = add (hp->value, NULL); while (isspace (*cp)) cp++; for (dp = cp; istoken (*dp); dp++) continue; c = *dp; *dp = '\0'; /* * Find the internal flag and Init function * for this transfer encoding. */ for (s2i = str2ces; s2i->si_key; s2i++) if (!mh_strcasecmp (cp, s2i->si_key)) break; if (!s2i->si_key && !uprf (cp, "X-")) s2i++; *dp = c; ct->c_encoding = s2i->si_val; /* Call the Init function for this encoding */ if (s2i->si_init && (*s2i->si_init) (ct) == NOTOK) goto out; } else if (!mh_strcasecmp (hp->name, MD5_FIELD)) { /* Get Content-MD5 field */ unsigned char *cp, *dp; char *ep; if (!checksw) goto next_header; if (ct->c_digested) { advise (NULL, "message %s has multiple %s: fields", ct->c_file, MD5_FIELD); goto next_header; } ep = cp = add (hp->value, NULL); /* get a copy */ while (isspace (*cp)) cp++; for (dp = strchr(cp, '\n'); dp; dp = strchr(dp, '\n')) *dp++ = ' '; for (dp = cp + strlen (cp) - 1; dp >= cp; dp--) if (!isspace (*dp)) break; *++dp = '\0'; if (debugsw) fprintf (stderr, "%s: %s\n", MD5_FIELD, cp); if (*cp == '(' && get_comment (ct, &cp, 0) == NOTOK) { free (ep); goto out; } for (dp = cp; *dp && !isspace (*dp); dp++) continue; *dp = '\0'; readDigest (ct, cp); free (ep); ct->c_digested++; } else if (!mh_strcasecmp (hp->name, ID_FIELD)) { /* Get Content-ID field */ ct->c_id = add (hp->value, ct->c_id); } else if (!mh_strcasecmp (hp->name, DESCR_FIELD)) { /* Get Content-Description field */ ct->c_descr = add (hp->value, ct->c_descr); } else if (!mh_strcasecmp (hp->name, DISPO_FIELD)) { /* Get Content-Disposition field */ ct->c_dispo = add (hp->value, ct->c_dispo); } next_header: hp = hp->next; /* next header field */ } /* * Check if we saw a Content-Type field. * If not, then assign a default value for * it, and the Init function. */ if (!ct->c_ctline) { /* * If we are inside a multipart/digest message, * so default type is message/rfc822 */ if (toplevel < 0) { if (get_ctinfo ("message/rfc822", ct, 0) == NOTOK) goto out; ct->c_type = CT_MESSAGE; ct->c_ctinitfnx = InitMessage; } else { /* * Else default type is text/plain */ if (get_ctinfo ("text/plain", ct, 0) == NOTOK) goto out; ct->c_type = CT_TEXT; ct->c_ctinitfnx = InitText; } } /* Use default Transfer-Encoding, if necessary */ if (!ct->c_celine) { ct->c_encoding = CE_7BIT; Init7Bit (ct); } return ct; out: free_content (ct); return NULL; } /* * small routine to add header field to list */ int add_header (CT ct, char *name, char *value) { HF hp; /* allocate header field structure */ hp = mh_xmalloc (sizeof(*hp)); /* link data into header structure */ hp->name = name; hp->value = value; hp->next = NULL; /* link header structure into the list */ if (ct->c_first_hf == NULL) { ct->c_first_hf = hp; /* this is the first */ ct->c_last_hf = hp; } else { ct->c_last_hf->next = hp; /* add it to the end */ ct->c_last_hf = hp; } return 0; } /* Make sure that buf contains at least one appearance of name, followed by =. If not, insert both name and value, just after first semicolon, if any. Note that name should not contain a trailing =. And quotes will be added around the value. Typical usage: make sure that a Content-Disposition header contains filename="foo". If it doesn't and value does, use value from that. */ static char * incl_name_value (unsigned char *buf, char *name, char *value) { char *newbuf = buf; /* Assume that name is non-null. */ if (buf && value) { char *name_plus_equal = concat (name, "=", NULL); if (! strstr (buf, name_plus_equal)) { char *insertion; unsigned char *cp; char *prefix, *suffix; /* Trim trailing space, esp. newline. */ for (cp = &buf[strlen (buf) - 1]; cp >= buf && isspace (*cp); --cp) { *cp = '\0'; } insertion = concat ("; ", name, "=", "\"", value, "\"", NULL); /* Insert at first semicolon, if any. If none, append to end. */ prefix = add (buf, NULL); if ((cp = strchr (prefix, ';'))) { suffix = concat (cp, NULL); *cp = '\0'; newbuf = concat (prefix, insertion, suffix, "\n", NULL); free (suffix); } else { /* Append to end. */ newbuf = concat (buf, insertion, "\n", NULL); } free (prefix); free (insertion); free (buf); } free (name_plus_equal); } return newbuf; } /* Extract just name_suffix="foo", if any, from value. If there isn't one, return the entire value. Note that, for example, a name_suffix of name will match filename="foo", and return foo. */ static char * extract_name_value (char *name_suffix, char *value) { char *extracted_name_value = value; char *name_suffix_plus_quote = concat (name_suffix, "=\"", NULL); char *name_suffix_equals = strstr (value, name_suffix_plus_quote); char *cp; free (name_suffix_plus_quote); if (name_suffix_equals) { char *name_suffix_begin; /* Find first \". */ for (cp = name_suffix_equals; *cp != '"'; ++cp) /* empty */; name_suffix_begin = ++cp; /* Find second \". */ for (; *cp != '"'; ++cp) /* empty */; extracted_name_value = mh_xmalloc (cp - name_suffix_begin + 1); memcpy (extracted_name_value, name_suffix_begin, cp - name_suffix_begin); extracted_name_value[cp - name_suffix_begin] = '\0'; } return extracted_name_value; } /* * Parse Content-Type line and (if `magic' is non-zero) mhbuild composition * directives. Fills in the information of the CTinfo structure. */ int get_ctinfo (unsigned char *cp, CT ct, int magic) { int i; unsigned char *dp; char **ap, **ep; char c; CI ci; ci = &ct->c_ctinfo; i = strlen (invo_name) + 2; /* store copy of Content-Type line */ cp = ct->c_ctline = add (cp, NULL); while (isspace (*cp)) /* trim leading spaces */ cp++; /* change newlines to spaces */ for (dp = strchr(cp, '\n'); dp; dp = strchr(dp, '\n')) *dp++ = ' '; /* trim trailing spaces */ for (dp = cp + strlen (cp) - 1; dp >= cp; dp--) if (!isspace (*dp)) break; *++dp = '\0'; if (debugsw) fprintf (stderr, "%s: %s\n", TYPE_FIELD, cp); if (*cp == '(' && get_comment (ct, &cp, 1) == NOTOK) return NOTOK; for (dp = cp; istoken (*dp); dp++) continue; c = *dp, *dp = '\0'; ci->ci_type = add (cp, NULL); /* store content type */ *dp = c, cp = dp; if (!*ci->ci_type) { advise (NULL, "invalid %s: field in message %s (empty type)", TYPE_FIELD, ct->c_file); return NOTOK; } /* down case the content type string */ for (dp = ci->ci_type; *dp; dp++) if (isalpha(*dp) && isupper (*dp)) *dp = tolower (*dp); while (isspace (*cp)) cp++; if (*cp == '(' && get_comment (ct, &cp, 1) == NOTOK) return NOTOK; if (*cp != '/') { if (!magic) ci->ci_subtype = add ("", NULL); goto magic_skip; } cp++; while (isspace (*cp)) cp++; if (*cp == '(' && get_comment (ct, &cp, 1) == NOTOK) return NOTOK; for (dp = cp; istoken (*dp); dp++) continue; c = *dp, *dp = '\0'; ci->ci_subtype = add (cp, NULL); /* store the content subtype */ *dp = c, cp = dp; if (!*ci->ci_subtype) { advise (NULL, "invalid %s: field in message %s (empty subtype for \"%s\")", TYPE_FIELD, ct->c_file, ci->ci_type); return NOTOK; } /* down case the content subtype string */ for (dp = ci->ci_subtype; *dp; dp++) if (isalpha(*dp) && isupper (*dp)) *dp = tolower (*dp); magic_skip: while (isspace (*cp)) cp++; if (*cp == '(' && get_comment (ct, &cp, 1) == NOTOK) return NOTOK; /* * Parse attribute/value pairs given with Content-Type */ ep = (ap = ci->ci_attrs) + NPARMS; while (*cp == ';') { char *vp; unsigned char *up; if (ap >= ep) { advise (NULL, "too many parameters in message %s's %s: field (%d max)", ct->c_file, TYPE_FIELD, NPARMS); return NOTOK; } cp++; while (isspace (*cp)) cp++; if (*cp == '(' && get_comment (ct, &cp, 1) == NOTOK) return NOTOK; if (*cp == 0) { advise (NULL, "extraneous trailing ';' in message %s's %s: parameter list", ct->c_file, TYPE_FIELD); return OK; } /* down case the attribute name */ for (dp = cp; istoken (*dp); dp++) if (isalpha(*dp) && isupper (*dp)) *dp = tolower (*dp); for (up = dp; isspace (*dp);) dp++; if (dp == cp || *dp != '=') { advise (NULL, "invalid parameter in message %s's %s: field\n%*.*sparameter %s (error detected at offset %d)", ct->c_file, TYPE_FIELD, i, i, "", cp, dp - cp); return NOTOK; } vp = (*ap = add (cp, NULL)) + (up - cp); *vp = '\0'; for (dp++; isspace (*dp);) dp++; /* now add the attribute value */ ci->ci_values[ap - ci->ci_attrs] = vp = *ap + (dp - cp); if (*dp == '"') { for (cp = ++dp, dp = vp;;) { switch (c = *cp++) { case '\0': bad_quote: advise (NULL, "invalid quoted-string in message %s's %s: field\n%*.*s(parameter %s)", ct->c_file, TYPE_FIELD, i, i, "", *ap); return NOTOK; case '\\': *dp++ = c; if ((c = *cp++) == '\0') goto bad_quote; /* else fall... */ default: *dp++ = c; continue; case '"': *dp = '\0'; break; } break; } } else { for (cp = dp, dp = vp; istoken (*cp); cp++, dp++) continue; *dp = '\0'; } if (!*vp) { advise (NULL, "invalid parameter in message %s's %s: field\n%*.*s(parameter %s)", ct->c_file, TYPE_FIELD, i, i, "", *ap); return NOTOK; } ap++; while (isspace (*cp)) cp++; if (*cp == '(' && get_comment (ct, &cp, 1) == NOTOK) return NOTOK; } /* * Get any given in buffer */ if (magic && *cp == '<') { if (ct->c_id) { free (ct->c_id); ct->c_id = NULL; } if (!(dp = strchr(ct->c_id = ++cp, '>'))) { advise (NULL, "invalid ID in message %s", ct->c_file); return NOTOK; } c = *dp; *dp = '\0'; if (*ct->c_id) ct->c_id = concat ("<", ct->c_id, ">\n", NULL); else ct->c_id = NULL; *dp++ = c; cp = dp; while (isspace (*cp)) cp++; } /* * Get any [Content-Description] given in buffer. */ if (magic && *cp == '[') { ct->c_descr = ++cp; for (dp = cp + strlen (cp) - 1; dp >= cp; dp--) if (*dp == ']') break; if (dp < cp) { advise (NULL, "invalid description in message %s", ct->c_file); ct->c_descr = NULL; return NOTOK; } c = *dp; *dp = '\0'; if (*ct->c_descr) ct->c_descr = concat (ct->c_descr, "\n", NULL); else ct->c_descr = NULL; *dp++ = c; cp = dp; while (isspace (*cp)) cp++; } /* * Get any {Content-Disposition} given in buffer. */ if (magic && *cp == '{') { ct->c_dispo = ++cp; for (dp = cp + strlen (cp) - 1; dp >= cp; dp--) if (*dp == '}') break; if (dp < cp) { advise (NULL, "invalid disposition in message %s", ct->c_file); ct->c_dispo = NULL; return NOTOK; } c = *dp; *dp = '\0'; if (*ct->c_dispo) ct->c_dispo = concat (ct->c_dispo, "\n", NULL); else ct->c_dispo = NULL; *dp++ = c; cp = dp; while (isspace (*cp)) cp++; } /* * Check if anything is left over */ if (*cp) { if (magic) { ci->ci_magic = add (cp, NULL); /* If there is a Content-Disposition header and it doesn't have a *filename=, extract it from the magic contents. The r1bindex call skips any leading directory components. */ if (ct->c_dispo) ct->c_dispo = incl_name_value (ct->c_dispo, "filename", r1bindex (extract_name_value ("name", ci-> ci_magic), '/')); } else advise (NULL, "extraneous information in message %s's %s: field\n%*.*s(%s)", ct->c_file, TYPE_FIELD, i, i, "", cp); } return OK; } static int get_comment (CT ct, unsigned char **ap, int istype) { int i; char *bp; unsigned char *cp; char c, buffer[BUFSIZ], *dp; CI ci; ci = &ct->c_ctinfo; cp = *ap; bp = buffer; cp++; for (i = 0;;) { switch (c = *cp++) { case '\0': invalid: advise (NULL, "invalid comment in message %s's %s: field", ct->c_file, istype ? TYPE_FIELD : VRSN_FIELD); return NOTOK; case '\\': *bp++ = c; if ((c = *cp++) == '\0') goto invalid; *bp++ = c; continue; case '(': i++; /* and fall... */ default: *bp++ = c; continue; case ')': if (--i < 0) break; *bp++ = c; continue; } break; } *bp = '\0'; if (istype) { if ((dp = ci->ci_comment)) { ci->ci_comment = concat (dp, " ", buffer, NULL); free (dp); } else { ci->ci_comment = add (buffer, NULL); } } while (isspace (*cp)) cp++; *ap = cp; return OK; } /* * CONTENTS * * Handles content types audio, image, and video. * There's not much to do right here. */ static int InitGeneric (CT ct) { NMH_UNUSED (ct); return OK; /* not much to do here */ } /* * TEXT */ static int InitText (CT ct) { char buffer[BUFSIZ]; char *chset = NULL; char **ap, **ep, *cp; struct k2v *kv; struct text *t; CI ci = &ct->c_ctinfo; /* check for missing subtype */ if (!*ci->ci_subtype) ci->ci_subtype = add ("plain", ci->ci_subtype); /* match subtype */ for (kv = SubText; kv->kv_key; kv++) if (!mh_strcasecmp (ci->ci_subtype, kv->kv_key)) break; ct->c_subtype = kv->kv_value; /* allocate text character set structure */ if ((t = (struct text *) calloc (1, sizeof(*t))) == NULL) adios (NULL, "out of memory"); ct->c_ctparams = (void *) t; /* scan for charset parameter */ for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) if (!mh_strcasecmp (*ap, "charset")) break; /* check if content specified a character set */ if (*ap) { chset = *ep; t->tx_charset = CHARSET_SPECIFIED; } else { t->tx_charset = CHARSET_UNSPECIFIED; } /* * If we can not handle character set natively, * then check profile for string to modify the * terminal or display method. * * termproc is for mhshow, though mhlist -debug prints it, too. */ if (chset != NULL && !check_charset (chset, strlen (chset))) { snprintf (buffer, sizeof(buffer), "%s-charset-%s", invo_name, chset); if ((cp = context_find (buffer))) ct->c_termproc = getcpy (cp); } return OK; } /* * MULTIPART */ static int InitMultiPart (CT ct) { int inout; long last, pos; unsigned char *cp, *dp; char **ap, **ep; char *bp, buffer[BUFSIZ]; struct multipart *m; struct k2v *kv; struct part *part, **next; CI ci = &ct->c_ctinfo; CT p; FILE *fp; /* * The encoding for multipart messages must be either * 7bit, 8bit, or binary (per RFC2045). */ if (ct->c_encoding != CE_7BIT && ct->c_encoding != CE_8BIT && ct->c_encoding != CE_BINARY) { admonish (NULL, "\"%s/%s\" type in message %s must be encoded in 7bit, 8bit, or binary", ci->ci_type, ci->ci_subtype, ct->c_file); return NOTOK; } /* match subtype */ for (kv = SubMultiPart; kv->kv_key; kv++) if (!mh_strcasecmp (ci->ci_subtype, kv->kv_key)) break; ct->c_subtype = kv->kv_value; /* * Check for "boundary" parameter, which is * required for multipart messages. */ bp = 0; for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) { if (!mh_strcasecmp (*ap, "boundary")) { bp = *ep; break; } } /* complain if boundary parameter is missing */ if (!*ap) { advise (NULL, "a \"boundary\" parameter is mandatory for \"%s/%s\" type in message %s's %s: field", ci->ci_type, ci->ci_subtype, ct->c_file, TYPE_FIELD); return NOTOK; } /* allocate primary structure for multipart info */ if ((m = (struct multipart *) calloc (1, sizeof(*m))) == NULL) adios (NULL, "out of memory"); ct->c_ctparams = (void *) m; /* check if boundary parameter contains only whitespace characters */ for (cp = bp; isspace (*cp); cp++) continue; if (!*cp) { advise (NULL, "invalid \"boundary\" parameter for \"%s/%s\" type in message %s's %s: field", ci->ci_type, ci->ci_subtype, ct->c_file, TYPE_FIELD); return NOTOK; } /* remove trailing whitespace from boundary parameter */ for (cp = bp, dp = cp + strlen (cp) - 1; dp > cp; dp--) if (!isspace (*dp)) break; *++dp = '\0'; /* record boundary separators */ m->mp_start = concat (bp, "\n", NULL); m->mp_stop = concat (bp, "--\n", NULL); if (!ct->c_fp && (ct->c_fp = fopen (ct->c_file, "r")) == NULL) { advise (ct->c_file, "unable to open for reading"); return NOTOK; } fseek (fp = ct->c_fp, pos = ct->c_begin, SEEK_SET); last = ct->c_end; next = &m->mp_parts; part = NULL; inout = 1; while (fgets (buffer, sizeof(buffer) - 1, fp)) { if (pos > last) break; pos += strlen (buffer); if (buffer[0] != '-' || buffer[1] != '-') continue; if (inout) { if (strcmp (buffer + 2, m->mp_start)) continue; next_part: if ((part = (struct part *) calloc (1, sizeof(*part))) == NULL) adios (NULL, "out of memory"); *next = part; next = &part->mp_next; if (!(p = get_content (fp, ct->c_file, ct->c_subtype == MULTI_DIGEST ? -1 : 0))) { ct->c_fp = NULL; return NOTOK; } p->c_fp = NULL; part->mp_part = p; pos = p->c_begin; fseek (fp, pos, SEEK_SET); inout = 0; } else { if (strcmp (buffer + 2, m->mp_start) == 0) { inout = 1; end_part: p = part->mp_part; p->c_end = ftell(fp) - (strlen(buffer) + 1); if (p->c_end < p->c_begin) p->c_begin = p->c_end; if (inout) goto next_part; goto last_part; } else { if (strcmp (buffer + 2, m->mp_stop) == 0) goto end_part; } } } advise (NULL, "bogus multipart content in message %s", ct->c_file); if (!inout && part) { p = part->mp_part; p->c_end = ct->c_end; if (p->c_begin >= p->c_end) { for (next = &m->mp_parts; *next != part; next = &((*next)->mp_next)) continue; *next = NULL; free_content (p); free ((char *) part); } } last_part: /* reverse the order of the parts for multipart/alternative */ if (ct->c_subtype == MULTI_ALTERNATE) reverse_parts (ct); /* * label all subparts with part number, and * then initialize the content of the subpart. */ { int partnum; char *pp; char partnam[BUFSIZ]; if (ct->c_partno) { snprintf (partnam, sizeof(partnam), "%s.", ct->c_partno); pp = partnam + strlen (partnam); } else { pp = partnam; } for (part = m->mp_parts, partnum = 1; part; part = part->mp_next, partnum++) { p = part->mp_part; sprintf (pp, "%d", partnum); p->c_partno = add (partnam, NULL); /* initialize the content of the subparts */ if (p->c_ctinitfnx && (*p->c_ctinitfnx) (p) == NOTOK) { fclose (ct->c_fp); ct->c_fp = NULL; return NOTOK; } } } fclose (ct->c_fp); ct->c_fp = NULL; return OK; } /* * reverse the order of the parts of a multipart */ static void reverse_parts (CT ct) { int i; struct multipart *m; struct part **base, **bmp, **next, *part; m = (struct multipart *) ct->c_ctparams; /* if only one part, just return */ if (!m->mp_parts || !m->mp_parts->mp_next) return; /* count number of parts */ i = 0; for (part = m->mp_parts; part; part = part->mp_next) i++; /* allocate array of pointers to the parts */ if (!(base = (struct part **) calloc ((size_t) (i + 1), sizeof(*base)))) adios (NULL, "out of memory"); bmp = base; /* point at all the parts */ for (part = m->mp_parts; part; part = part->mp_next) *bmp++ = part; *bmp = NULL; /* reverse the order of the parts */ next = &m->mp_parts; for (bmp--; bmp >= base; bmp--) { part = *bmp; *next = part; next = &part->mp_next; } *next = NULL; /* free array of pointers */ free ((char *) base); } /* * MESSAGE */ static int InitMessage (CT ct) { struct k2v *kv; CI ci = &ct->c_ctinfo; if ((ct->c_encoding != CE_7BIT) && (ct->c_encoding != CE_8BIT)) { admonish (NULL, "\"%s/%s\" type in message %s should be encoded in 7bit or 8bit", ci->ci_type, ci->ci_subtype, ct->c_file); return NOTOK; } /* check for missing subtype */ if (!*ci->ci_subtype) ci->ci_subtype = add ("rfc822", ci->ci_subtype); /* match subtype */ for (kv = SubMessage; kv->kv_key; kv++) if (!mh_strcasecmp (ci->ci_subtype, kv->kv_key)) break; ct->c_subtype = kv->kv_value; switch (ct->c_subtype) { case MESSAGE_RFC822: break; case MESSAGE_PARTIAL: { char **ap, **ep; struct partial *p; if ((p = (struct partial *) calloc (1, sizeof(*p))) == NULL) adios (NULL, "out of memory"); ct->c_ctparams = (void *) p; /* scan for parameters "id", "number", and "total" */ for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) { if (!mh_strcasecmp (*ap, "id")) { p->pm_partid = add (*ep, NULL); continue; } if (!mh_strcasecmp (*ap, "number")) { if (sscanf (*ep, "%d", &p->pm_partno) != 1 || p->pm_partno < 1) { invalid_param: advise (NULL, "invalid %s parameter for \"%s/%s\" type in message %s's %s field", *ap, ci->ci_type, ci->ci_subtype, ct->c_file, TYPE_FIELD); return NOTOK; } continue; } if (!mh_strcasecmp (*ap, "total")) { if (sscanf (*ep, "%d", &p->pm_maxno) != 1 || p->pm_maxno < 1) goto invalid_param; continue; } } if (!p->pm_partid || !p->pm_partno || (p->pm_maxno && p->pm_partno > p->pm_maxno)) { advise (NULL, "invalid parameters for \"%s/%s\" type in message %s's %s field", ci->ci_type, ci->ci_subtype, ct->c_file, TYPE_FIELD); return NOTOK; } } break; case MESSAGE_EXTERNAL: { int exresult; struct exbody *e; CT p; FILE *fp; if ((e = (struct exbody *) calloc (1, sizeof(*e))) == NULL) adios (NULL, "out of memory"); ct->c_ctparams = (void *) e; if (!ct->c_fp && (ct->c_fp = fopen (ct->c_file, "r")) == NULL) { advise (ct->c_file, "unable to open for reading"); return NOTOK; } fseek (fp = ct->c_fp, ct->c_begin, SEEK_SET); if (!(p = get_content (fp, ct->c_file, 0))) { ct->c_fp = NULL; return NOTOK; } e->eb_parent = ct; e->eb_content = p; p->c_ctexbody = e; if ((exresult = params_external (ct, 0)) != NOTOK && p->c_ceopenfnx == openMail) { int cc, size; char *bp; if ((size = ct->c_end - p->c_begin) <= 0) { if (!e->eb_subject) content_error (NULL, ct, "empty body for access-type=mail-server"); goto no_body; } e->eb_body = bp = mh_xmalloc ((unsigned) size); fseek (p->c_fp, p->c_begin, SEEK_SET); while (size > 0) switch (cc = fread (bp, sizeof(*bp), size, p->c_fp)) { case NOTOK: adios ("failed", "fread"); case OK: adios (NULL, "unexpected EOF from fread"); default: bp += cc, size -= cc; break; } *bp = 0; } no_body: p->c_fp = NULL; p->c_end = p->c_begin; fclose (ct->c_fp); ct->c_fp = NULL; if (exresult == NOTOK) return NOTOK; if (e->eb_flags == NOTOK) return OK; switch (p->c_type) { case CT_MULTIPART: break; case CT_MESSAGE: if (p->c_subtype != MESSAGE_RFC822) break; /* else fall... */ default: e->eb_partno = ct->c_partno; if (p->c_ctinitfnx) (*p->c_ctinitfnx) (p); break; } } break; default: break; } return OK; } int params_external (CT ct, int composing) { char **ap, **ep; struct exbody *e = (struct exbody *) ct->c_ctparams; CI ci = &ct->c_ctinfo; for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) { if (!mh_strcasecmp (*ap, "access-type")) { struct str2init *s2i; CT p = e->eb_content; for (s2i = str2methods; s2i->si_key; s2i++) if (!mh_strcasecmp (*ep, s2i->si_key)) break; if (!s2i->si_key) { e->eb_access = *ep; e->eb_flags = NOTOK; p->c_encoding = CE_EXTERNAL; continue; } e->eb_access = s2i->si_key; e->eb_flags = s2i->si_val; p->c_encoding = CE_EXTERNAL; /* Call the Init function for this external type */ if ((*s2i->si_init)(p) == NOTOK) return NOTOK; continue; } if (!mh_strcasecmp (*ap, "name")) { e->eb_name = *ep; continue; } if (!mh_strcasecmp (*ap, "permission")) { e->eb_permission = *ep; continue; } if (!mh_strcasecmp (*ap, "site")) { e->eb_site = *ep; continue; } if (!mh_strcasecmp (*ap, "directory")) { e->eb_dir = *ep; continue; } if (!mh_strcasecmp (*ap, "mode")) { e->eb_mode = *ep; continue; } if (!mh_strcasecmp (*ap, "size")) { sscanf (*ep, "%lu", &e->eb_size); continue; } if (!mh_strcasecmp (*ap, "server")) { e->eb_server = *ep; continue; } if (!mh_strcasecmp (*ap, "subject")) { e->eb_subject = *ep; continue; } if (composing && !mh_strcasecmp (*ap, "body")) { e->eb_body = getcpy (*ep); continue; } } if (!e->eb_access) { advise (NULL, "invalid parameters for \"%s/%s\" type in message %s's %s field", ci->ci_type, ci->ci_subtype, ct->c_file, TYPE_FIELD); return NOTOK; } return OK; } /* * APPLICATION */ static int InitApplication (CT ct) { struct k2v *kv; CI ci = &ct->c_ctinfo; /* match subtype */ for (kv = SubApplication; kv->kv_key; kv++) if (!mh_strcasecmp (ci->ci_subtype, kv->kv_key)) break; ct->c_subtype = kv->kv_value; return OK; } /* * TRANSFER ENCODINGS */ static int init_encoding (CT ct, OpenCEFunc openfnx) { CE ce; if ((ce = (CE) calloc (1, sizeof(*ce))) == NULL) adios (NULL, "out of memory"); ct->c_cefile = ce; ct->c_ceopenfnx = openfnx; ct->c_ceclosefnx = close_encoding; ct->c_cesizefnx = size_encoding; return OK; } void close_encoding (CT ct) { CE ce; if (!(ce = ct->c_cefile)) return; if (ce->ce_fp) { fclose (ce->ce_fp); ce->ce_fp = NULL; } } static unsigned long size_encoding (CT ct) { int fd; unsigned long size; char *file; CE ce; struct stat st; if (!(ce = ct->c_cefile)) return (ct->c_end - ct->c_begin); if (ce->ce_fp && fstat (fileno (ce->ce_fp), &st) != NOTOK) return (long) st.st_size; if (ce->ce_file) { if (stat (ce->ce_file, &st) != NOTOK) return (long) st.st_size; else return 0L; } if (ct->c_encoding == CE_EXTERNAL) return (ct->c_end - ct->c_begin); file = NULL; if ((fd = (*ct->c_ceopenfnx) (ct, &file)) == NOTOK) return (ct->c_end - ct->c_begin); if (fstat (fd, &st) != NOTOK) size = (long) st.st_size; else size = 0L; (*ct->c_ceclosefnx) (ct); return size; } /* * BASE64 */ static unsigned char b642nib[0x80] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x3e, 0xff, 0xff, 0xff, 0x3f, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0xff, 0xff, 0xff, 0xff, 0xff }; static int InitBase64 (CT ct) { return init_encoding (ct, openBase64); } static int openBase64 (CT ct, char **file) { int bitno, cc, digested; int fd, len, skip, own_ct_fp = 0; uint32_t bits; unsigned char value, b; unsigned char *cp, *ep; char buffer[BUFSIZ]; /* sbeck -- handle suffixes */ CI ci; CE ce; MD5_CTX mdContext; ce = ct->c_cefile; if (ce->ce_fp) { fseek (ce->ce_fp, 0L, SEEK_SET); goto ready_to_go; } if (ce->ce_file) { if ((ce->ce_fp = fopen (ce->ce_file, "r")) == NULL) { content_error (ce->ce_file, ct, "unable to fopen for reading"); return NOTOK; } goto ready_to_go; } if (*file == NULL) { ce->ce_file = add (m_mktemp(tmp, NULL, NULL), NULL); ce->ce_unlink = 1; } else { ce->ce_file = add (*file, NULL); ce->ce_unlink = 0; } /* sbeck@cise.ufl.edu -- handle suffixes */ ci = &ct->c_ctinfo; snprintf (buffer, sizeof(buffer), "%s-suffix-%s/%s", invo_name, ci->ci_type, ci->ci_subtype); cp = context_find (buffer); if (cp == NULL || *cp == '\0') { snprintf (buffer, sizeof(buffer), "%s-suffix-%s", invo_name, ci->ci_type); cp = context_find (buffer); } if (cp != NULL && *cp != '\0') { if (ce->ce_unlink) { /* Temporary file already exists, so we rename to version with extension. */ char *file_org = strdup(ce->ce_file); ce->ce_file = add (cp, ce->ce_file); if (rename(file_org, ce->ce_file)) { adios (ce->ce_file, "unable to rename %s to ", file_org); } free(file_org); } else { ce->ce_file = add (cp, ce->ce_file); } } if ((ce->ce_fp = fopen (ce->ce_file, "w+")) == NULL) { content_error (ce->ce_file, ct, "unable to fopen for reading/writing"); return NOTOK; } if ((len = ct->c_end - ct->c_begin) < 0) adios (NULL, "internal error(1)"); if (! ct->c_fp) { if ((ct->c_fp = fopen (ct->c_file, "r")) == NULL) { content_error (ct->c_file, ct, "unable to open for reading"); return NOTOK; } own_ct_fp = 1; } if ((digested = ct->c_digested)) MD5Init (&mdContext); bitno = 18; bits = 0L; skip = 0; lseek (fd = fileno (ct->c_fp), (off_t) ct->c_begin, SEEK_SET); while (len > 0) { switch (cc = read (fd, buffer, sizeof(buffer) - 1)) { case NOTOK: content_error (ct->c_file, ct, "error reading from"); goto clean_up; case OK: content_error (NULL, ct, "premature eof"); goto clean_up; default: if (cc > len) cc = len; len -= cc; for (ep = (cp = buffer) + cc; cp < ep; cp++) { switch (*cp) { default: if (isspace (*cp)) break; if (skip || (*cp & 0x80) || (value = b642nib[*cp & 0x7f]) > 0x3f) { if (debugsw) { fprintf (stderr, "*cp=0x%x pos=%ld skip=%d\n", *cp, (long) (lseek (fd, (off_t) 0, SEEK_CUR) - (ep - cp)), skip); } content_error (NULL, ct, "invalid BASE64 encoding -- continuing"); continue; } bits |= value << bitno; test_end: if ((bitno -= 6) < 0) { b = (bits >> 16) & 0xff; putc ((char) b, ce->ce_fp); if (digested) MD5Update (&mdContext, &b, 1); if (skip < 2) { b = (bits >> 8) & 0xff; putc ((char) b, ce->ce_fp); if (digested) MD5Update (&mdContext, &b, 1); if (skip < 1) { b = bits & 0xff; putc ((char) b, ce->ce_fp); if (digested) MD5Update (&mdContext, &b, 1); } } if (ferror (ce->ce_fp)) { content_error (ce->ce_file, ct, "error writing to"); goto clean_up; } bitno = 18, bits = 0L, skip = 0; } break; case '=': if (++skip > 3) goto self_delimiting; goto test_end; } } } } if (bitno != 18) { if (debugsw) fprintf (stderr, "premature ending (bitno %d)\n", bitno); content_error (NULL, ct, "invalid BASE64 encoding"); goto clean_up; } self_delimiting: fseek (ct->c_fp, 0L, SEEK_SET); if (fflush (ce->ce_fp)) { content_error (ce->ce_file, ct, "error writing to"); goto clean_up; } if (digested) { unsigned char digest[16]; MD5Final (digest, &mdContext); if (memcmp((char *) digest, (char *) ct->c_digest, sizeof(digest) / sizeof(digest[0]))) content_error (NULL, ct, "content integrity suspect (digest mismatch) -- continuing"); else if (debugsw) fprintf (stderr, "content integrity confirmed\n"); } fseek (ce->ce_fp, 0L, SEEK_SET); ready_to_go: *file = ce->ce_file; if (own_ct_fp) { fclose (ct->c_fp); ct->c_fp = NULL; } return fileno (ce->ce_fp); clean_up: if (own_ct_fp) { fclose (ct->c_fp); ct->c_fp = NULL; } free_encoding (ct, 0); return NOTOK; } /* * QUOTED PRINTABLE */ static char hex2nib[0x80] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0a, 0x0b, 0x0c, 0x0d, 0x0e, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }; static int InitQuoted (CT ct) { return init_encoding (ct, openQuoted); } static int openQuoted (CT ct, char **file) { int cc, digested, len, quoted, own_ct_fp = 0; unsigned char *cp, *ep; char buffer[BUFSIZ]; unsigned char mask; CE ce; /* sbeck -- handle suffixes */ CI ci; MD5_CTX mdContext; ce = ct->c_cefile; if (ce->ce_fp) { fseek (ce->ce_fp, 0L, SEEK_SET); goto ready_to_go; } if (ce->ce_file) { if ((ce->ce_fp = fopen (ce->ce_file, "r")) == NULL) { content_error (ce->ce_file, ct, "unable to fopen for reading"); return NOTOK; } goto ready_to_go; } if (*file == NULL) { ce->ce_file = add (m_mktemp(tmp, NULL, NULL), NULL); ce->ce_unlink = 1; } else { ce->ce_file = add (*file, NULL); ce->ce_unlink = 0; } /* sbeck@cise.ufl.edu -- handle suffixes */ ci = &ct->c_ctinfo; snprintf (buffer, sizeof(buffer), "%s-suffix-%s/%s", invo_name, ci->ci_type, ci->ci_subtype); cp = context_find (buffer); if (cp == NULL || *cp == '\0') { snprintf (buffer, sizeof(buffer), "%s-suffix-%s", invo_name, ci->ci_type); cp = context_find (buffer); } if (cp != NULL && *cp != '\0') { if (ce->ce_unlink) { /* Temporary file already exists, so we rename to version with extension. */ char *file_org = strdup(ce->ce_file); ce->ce_file = add (cp, ce->ce_file); if (rename(file_org, ce->ce_file)) { adios (ce->ce_file, "unable to rename %s to ", file_org); } free(file_org); } else { ce->ce_file = add (cp, ce->ce_file); } } if ((ce->ce_fp = fopen (ce->ce_file, "w+")) == NULL) { content_error (ce->ce_file, ct, "unable to fopen for reading/writing"); return NOTOK; } if ((len = ct->c_end - ct->c_begin) < 0) adios (NULL, "internal error(2)"); if (! ct->c_fp) { if ((ct->c_fp = fopen (ct->c_file, "r")) == NULL) { content_error (ct->c_file, ct, "unable to open for reading"); return NOTOK; } own_ct_fp = 1; } if ((digested = ct->c_digested)) MD5Init (&mdContext); quoted = 0; #ifdef lint mask = 0; #endif fseek (ct->c_fp, ct->c_begin, SEEK_SET); while (len > 0) { if (fgets (buffer, sizeof(buffer) - 1, ct->c_fp) == NULL) { content_error (NULL, ct, "premature eof"); goto clean_up; } if ((cc = strlen (buffer)) > len) cc = len; len -= cc; for (ep = (cp = buffer) + cc - 1; cp <= ep; ep--) if (!isspace (*ep)) break; *++ep = '\n', ep++; for (; cp < ep; cp++) { if (quoted > 0) { /* in an escape sequence */ if (quoted == 1) { /* at byte 1 of an escape sequence */ mask = hex2nib[*cp & 0x7f]; /* next is byte 2 */ quoted = 2; } else { /* at byte 2 of an escape sequence */ mask <<= 4; mask |= hex2nib[*cp & 0x7f]; putc (mask, ce->ce_fp); if (digested) MD5Update (&mdContext, &mask, 1); if (ferror (ce->ce_fp)) { content_error (ce->ce_file, ct, "error writing to"); goto clean_up; } /* finished escape sequence; next may be literal or a new * escape sequence */ quoted = 0; } /* on to next byte */ continue; } /* not in an escape sequence */ if (*cp == '=') { /* starting an escape sequence, or invalid '='? */ if (cp + 1 < ep && cp[1] == '\n') { /* "=\n" soft line break, eat the \n */ cp++; continue; } if (cp + 1 >= ep || cp + 2 >= ep) { /* We don't have 2 bytes left, so this is an invalid * escape sequence; just show the raw bytes (below). */ } else if (isxdigit (cp[1]) && isxdigit (cp[2])) { /* Next 2 bytes are hex digits, making this a valid escape * sequence; let's decode it (above). */ quoted = 1; continue; } else { /* One or both of the next 2 is out of range, making this * an invalid escape sequence; just show the raw bytes * (below). */ } } /* Just show the raw byte. */ putc (*cp, ce->ce_fp); if (digested) { if (*cp == '\n') { MD5Update (&mdContext, (unsigned char *) "\r\n",2); } else { MD5Update (&mdContext, (unsigned char *) cp, 1); } } if (ferror (ce->ce_fp)) { content_error (ce->ce_file, ct, "error writing to"); goto clean_up; } } } if (quoted) { content_error (NULL, ct, "invalid QUOTED-PRINTABLE encoding -- end-of-content while still quoting"); goto clean_up; } fseek (ct->c_fp, 0L, SEEK_SET); if (fflush (ce->ce_fp)) { content_error (ce->ce_file, ct, "error writing to"); goto clean_up; } if (digested) { unsigned char digest[16]; MD5Final (digest, &mdContext); if (memcmp((char *) digest, (char *) ct->c_digest, sizeof(digest) / sizeof(digest[0]))) content_error (NULL, ct, "content integrity suspect (digest mismatch) -- continuing"); else if (debugsw) fprintf (stderr, "content integrity confirmed\n"); } fseek (ce->ce_fp, 0L, SEEK_SET); ready_to_go: *file = ce->ce_file; if (own_ct_fp) { fclose (ct->c_fp); ct->c_fp = NULL; } return fileno (ce->ce_fp); clean_up: free_encoding (ct, 0); if (own_ct_fp) { fclose (ct->c_fp); ct->c_fp = NULL; } return NOTOK; } /* * 7BIT */ static int Init7Bit (CT ct) { if (init_encoding (ct, open7Bit) == NOTOK) return NOTOK; ct->c_cesizefnx = NULL; /* no need to decode for real size */ return OK; } int open7Bit (CT ct, char **file) { int cc, fd, len, own_ct_fp = 0; char buffer[BUFSIZ]; /* sbeck -- handle suffixes */ char *cp; CI ci; CE ce; ce = ct->c_cefile; if (ce->ce_fp) { fseek (ce->ce_fp, 0L, SEEK_SET); goto ready_to_go; } if (ce->ce_file) { if ((ce->ce_fp = fopen (ce->ce_file, "r")) == NULL) { content_error (ce->ce_file, ct, "unable to fopen for reading"); return NOTOK; } goto ready_to_go; } if (*file == NULL) { ce->ce_file = add (m_mktemp(tmp, NULL, NULL), NULL); ce->ce_unlink = 1; } else { ce->ce_file = add (*file, NULL); ce->ce_unlink = 0; } /* sbeck@cise.ufl.edu -- handle suffixes */ ci = &ct->c_ctinfo; snprintf (buffer, sizeof(buffer), "%s-suffix-%s/%s", invo_name, ci->ci_type, ci->ci_subtype); cp = context_find (buffer); if (cp == NULL || *cp == '\0') { snprintf (buffer, sizeof(buffer), "%s-suffix-%s", invo_name, ci->ci_type); cp = context_find (buffer); } if (cp != NULL && *cp != '\0') { if (ce->ce_unlink) { /* Temporary file already exists, so we rename to version with extension. */ char *file_org = strdup(ce->ce_file); ce->ce_file = add (cp, ce->ce_file); if (rename(file_org, ce->ce_file)) { adios (ce->ce_file, "unable to rename %s to ", file_org); } free(file_org); } else { ce->ce_file = add (cp, ce->ce_file); } } if ((ce->ce_fp = fopen (ce->ce_file, "w+")) == NULL) { content_error (ce->ce_file, ct, "unable to fopen for reading/writing"); return NOTOK; } if (ct->c_type == CT_MULTIPART) { char **ap, **ep; CI ci = &ct->c_ctinfo; len = 0; fprintf (ce->ce_fp, "%s: %s/%s", TYPE_FIELD, ci->ci_type, ci->ci_subtype); len += strlen (TYPE_FIELD) + 2 + strlen (ci->ci_type) + 1 + strlen (ci->ci_subtype); for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) { putc (';', ce->ce_fp); len++; snprintf (buffer, sizeof(buffer), "%s=\"%s\"", *ap, *ep); if (len + 1 + (cc = strlen (buffer)) >= CPERLIN) { fputs ("\n\t", ce->ce_fp); len = 8; } else { putc (' ', ce->ce_fp); len++; } fprintf (ce->ce_fp, "%s", buffer); len += cc; } if (ci->ci_comment) { if (len + 1 + (cc = 2 + strlen (ci->ci_comment)) >= CPERLIN) { fputs ("\n\t", ce->ce_fp); len = 8; } else { putc (' ', ce->ce_fp); len++; } fprintf (ce->ce_fp, "(%s)", ci->ci_comment); len += cc; } fprintf (ce->ce_fp, "\n"); if (ct->c_id) fprintf (ce->ce_fp, "%s:%s", ID_FIELD, ct->c_id); if (ct->c_descr) fprintf (ce->ce_fp, "%s:%s", DESCR_FIELD, ct->c_descr); if (ct->c_dispo) fprintf (ce->ce_fp, "%s:%s", DISPO_FIELD, ct->c_dispo); fprintf (ce->ce_fp, "\n"); } if ((len = ct->c_end - ct->c_begin) < 0) adios (NULL, "internal error(3)"); if (! ct->c_fp) { if ((ct->c_fp = fopen (ct->c_file, "r")) == NULL) { content_error (ct->c_file, ct, "unable to open for reading"); return NOTOK; } own_ct_fp = 1; } lseek (fd = fileno (ct->c_fp), (off_t) ct->c_begin, SEEK_SET); while (len > 0) switch (cc = read (fd, buffer, sizeof(buffer) - 1)) { case NOTOK: content_error (ct->c_file, ct, "error reading from"); goto clean_up; case OK: content_error (NULL, ct, "premature eof"); goto clean_up; default: if (cc > len) cc = len; len -= cc; fwrite (buffer, sizeof(*buffer), cc, ce->ce_fp); if (ferror (ce->ce_fp)) { content_error (ce->ce_file, ct, "error writing to"); goto clean_up; } } fseek (ct->c_fp, 0L, SEEK_SET); if (fflush (ce->ce_fp)) { content_error (ce->ce_file, ct, "error writing to"); goto clean_up; } fseek (ce->ce_fp, 0L, SEEK_SET); ready_to_go: *file = ce->ce_file; if (own_ct_fp) { fclose (ct->c_fp); ct->c_fp = NULL; } return fileno (ce->ce_fp); clean_up: free_encoding (ct, 0); if (own_ct_fp) { fclose (ct->c_fp); ct->c_fp = NULL; } return NOTOK; } /* * External */ static int openExternal (CT ct, CT cb, CE ce, char **file, int *fd) { char cachefile[BUFSIZ]; if (ce->ce_fp) { fseek (ce->ce_fp, 0L, SEEK_SET); goto ready_already; } if (ce->ce_file) { if ((ce->ce_fp = fopen (ce->ce_file, "r")) == NULL) { content_error (ce->ce_file, ct, "unable to fopen for reading"); return NOTOK; } goto ready_already; } if (find_cache (ct, rcachesw, (int *) 0, cb->c_id, cachefile, sizeof(cachefile)) != NOTOK) { if ((ce->ce_fp = fopen (cachefile, "r"))) { ce->ce_file = getcpy (cachefile); ce->ce_unlink = 0; goto ready_already; } else { admonish (cachefile, "unable to fopen for reading"); } } return OK; ready_already: *file = ce->ce_file; *fd = fileno (ce->ce_fp); return DONE; } /* * File */ static int InitFile (CT ct) { return init_encoding (ct, openFile); } static int openFile (CT ct, char **file) { int fd, cachetype; char cachefile[BUFSIZ]; struct exbody *e = ct->c_ctexbody; CE ce = ct->c_cefile; switch (openExternal (e->eb_parent, e->eb_content, ce, file, &fd)) { case NOTOK: return NOTOK; case OK: break; case DONE: return fd; } if (!e->eb_name) { content_error (NULL, ct, "missing name parameter"); return NOTOK; } ce->ce_file = getcpy (e->eb_name); ce->ce_unlink = 0; if ((ce->ce_fp = fopen (ce->ce_file, "r")) == NULL) { content_error (ce->ce_file, ct, "unable to fopen for reading"); return NOTOK; } if ((!e->eb_permission || mh_strcasecmp (e->eb_permission, "read-write")) && find_cache (NULL, wcachesw, &cachetype, e->eb_content->c_id, cachefile, sizeof(cachefile)) != NOTOK) { int mask; FILE *fp; mask = umask (cachetype ? ~m_gmprot () : 0222); if ((fp = fopen (cachefile, "w"))) { int cc; char buffer[BUFSIZ]; FILE *gp = ce->ce_fp; fseek (gp, 0L, SEEK_SET); while ((cc = fread (buffer, sizeof(*buffer), sizeof(buffer), gp)) > 0) fwrite (buffer, sizeof(*buffer), cc, fp); fflush (fp); if (ferror (gp)) { admonish (ce->ce_file, "error reading"); unlink (cachefile); } else if (ferror (fp)) { admonish (cachefile, "error writing"); unlink (cachefile); } fclose (fp); } umask (mask); } fseek (ce->ce_fp, 0L, SEEK_SET); *file = ce->ce_file; return fileno (ce->ce_fp); } /* * FTP */ static int InitFTP (CT ct) { return init_encoding (ct, openFTP); } static int openFTP (CT ct, char **file) { int cachetype, caching, fd; int len, buflen; char *bp, *ftp, *user, *pass; char buffer[BUFSIZ], cachefile[BUFSIZ]; struct exbody *e; CE ce; static char *username = NULL; static char *password = NULL; e = ct->c_ctexbody; ce = ct->c_cefile; if ((ftp = context_find (nmhaccessftp)) && !*ftp) ftp = NULL; if (!ftp) return NOTOK; switch (openExternal (e->eb_parent, e->eb_content, ce, file, &fd)) { case NOTOK: return NOTOK; case OK: break; case DONE: return fd; } if (!e->eb_name || !e->eb_site) { content_error (NULL, ct, "missing %s parameter", e->eb_name ? "site": "name"); return NOTOK; } if (xpid) { if (xpid < 0) xpid = -xpid; pidcheck (pidwait (xpid, NOTOK)); xpid = 0; } /* Get the buffer ready to go */ bp = buffer; buflen = sizeof(buffer); /* * Construct the query message for user */ snprintf (bp, buflen, "Retrieve %s", e->eb_name); len = strlen (bp); bp += len; buflen -= len; if (e->eb_partno) { snprintf (bp, buflen, " (content %s)", e->eb_partno); len = strlen (bp); bp += len; buflen -= len; } snprintf (bp, buflen, "\n using %sFTP from site %s", e->eb_flags ? "anonymous " : "", e->eb_site); len = strlen (bp); bp += len; buflen -= len; if (e->eb_size > 0) { snprintf (bp, buflen, " (%lu octets)", e->eb_size); len = strlen (bp); bp += len; buflen -= len; } snprintf (bp, buflen, "? "); /* * Now, check the answer */ if (!getanswer (buffer)) return NOTOK; if (e->eb_flags) { user = "anonymous"; snprintf (buffer, sizeof(buffer), "%s@%s", getusername (), LocalName (1)); pass = buffer; } else { ruserpass (e->eb_site, &username, &password); user = username; pass = password; } ce->ce_unlink = (*file == NULL); caching = 0; cachefile[0] = '\0'; if ((!e->eb_permission || mh_strcasecmp (e->eb_permission, "read-write")) && find_cache (NULL, wcachesw, &cachetype, e->eb_content->c_id, cachefile, sizeof(cachefile)) != NOTOK) { if (*file == NULL) { ce->ce_unlink = 0; caching = 1; } } if (*file) ce->ce_file = add (*file, NULL); else if (caching) ce->ce_file = add (cachefile, NULL); else ce->ce_file = add (m_mktemp(tmp, NULL, NULL), NULL); if ((ce->ce_fp = fopen (ce->ce_file, "w+")) == NULL) { content_error (ce->ce_file, ct, "unable to fopen for reading/writing"); return NOTOK; } { int child_id, i, vecp; char *vec[9]; vecp = 0; vec[vecp++] = r1bindex (ftp, '/'); vec[vecp++] = e->eb_site; vec[vecp++] = user; vec[vecp++] = pass; vec[vecp++] = e->eb_dir; vec[vecp++] = e->eb_name; vec[vecp++] = ce->ce_file, vec[vecp++] = e->eb_mode && !mh_strcasecmp (e->eb_mode, "ascii") ? "ascii" : "binary"; vec[vecp] = NULL; fflush (stdout); for (i = 0; (child_id = vfork()) == NOTOK && i < 5; i++) sleep (5); switch (child_id) { case NOTOK: adios ("fork", "unable to"); /* NOTREACHED */ case OK: close (fileno (ce->ce_fp)); execvp (ftp, vec); fprintf (stderr, "unable to exec "); perror (ftp); _exit (-1); /* NOTREACHED */ default: if (pidXwait (child_id, NULL)) { username = password = NULL; ce->ce_unlink = 1; return NOTOK; } break; } } if (cachefile[0]) { if (caching) chmod (cachefile, cachetype ? m_gmprot () : 0444); else { int mask; FILE *fp; mask = umask (cachetype ? ~m_gmprot () : 0222); if ((fp = fopen (cachefile, "w"))) { int cc; FILE *gp = ce->ce_fp; fseek (gp, 0L, SEEK_SET); while ((cc= fread (buffer, sizeof(*buffer), sizeof(buffer), gp)) > 0) fwrite (buffer, sizeof(*buffer), cc, fp); fflush (fp); if (ferror (gp)) { admonish (ce->ce_file, "error reading"); unlink (cachefile); } else if (ferror (fp)) { admonish (cachefile, "error writing"); unlink (cachefile); } fclose (fp); } umask (mask); } } fseek (ce->ce_fp, 0L, SEEK_SET); *file = ce->ce_file; return fileno (ce->ce_fp); } /* * Mail */ static int InitMail (CT ct) { return init_encoding (ct, openMail); } static int openMail (CT ct, char **file) { int child_id, fd, i, vecp; int len, buflen; char *bp, buffer[BUFSIZ], *vec[7]; struct exbody *e = ct->c_ctexbody; CE ce = ct->c_cefile; switch (openExternal (e->eb_parent, e->eb_content, ce, file, &fd)) { case NOTOK: return NOTOK; case OK: break; case DONE: return fd; } if (!e->eb_server) { content_error (NULL, ct, "missing server parameter"); return NOTOK; } if (xpid) { if (xpid < 0) xpid = -xpid; pidcheck (pidwait (xpid, NOTOK)); xpid = 0; } /* Get buffer ready to go */ bp = buffer; buflen = sizeof(buffer); /* Now, construct query message */ snprintf (bp, buflen, "Retrieve content"); len = strlen (bp); bp += len; buflen -= len; if (e->eb_partno) { snprintf (bp, buflen, " %s", e->eb_partno); len = strlen (bp); bp += len; buflen -= len; } snprintf (bp, buflen, " by asking %s\n\n%s\n? ", e->eb_server, e->eb_subject ? e->eb_subject : e->eb_body); /* Now, check answer */ if (!getanswer (buffer)) return NOTOK; vecp = 0; vec[vecp++] = r1bindex (mailproc, '/'); vec[vecp++] = e->eb_server; vec[vecp++] = "-subject"; vec[vecp++] = e->eb_subject ? e->eb_subject : "mail-server request"; vec[vecp++] = "-body"; vec[vecp++] = e->eb_body; vec[vecp] = NULL; for (i = 0; (child_id = vfork()) == NOTOK && i < 5; i++) sleep (5); switch (child_id) { case NOTOK: advise ("fork", "unable to"); return NOTOK; case OK: execvp (mailproc, vec); fprintf (stderr, "unable to exec "); perror (mailproc); _exit (-1); /* NOTREACHED */ default: if (pidXwait (child_id, NULL) == OK) advise (NULL, "request sent"); break; } if (*file == NULL) { ce->ce_file = add (m_mktemp(tmp, NULL, NULL), NULL); ce->ce_unlink = 1; } else { ce->ce_file = add (*file, NULL); ce->ce_unlink = 0; } if ((ce->ce_fp = fopen (ce->ce_file, "w+")) == NULL) { content_error (ce->ce_file, ct, "unable to fopen for reading/writing"); return NOTOK; } /* showproc is for mhshow and mhstore, though mhlist -debug * prints it, too. */ if (ct->c_showproc) free (ct->c_showproc); ct->c_showproc = add ("true", NULL); fseek (ce->ce_fp, 0L, SEEK_SET); *file = ce->ce_file; return fileno (ce->ce_fp); } static int readDigest (CT ct, char *cp) { int bitno, skip; uint32_t bits; char *bp = cp; unsigned char *dp, value, *ep; bitno = 18; bits = 0L; skip = 0; for (ep = (dp = ct->c_digest) + sizeof(ct->c_digest) / sizeof(ct->c_digest[0]); *cp; cp++) switch (*cp) { default: if (skip || (*cp & 0x80) || (value = b642nib[*cp & 0x7f]) > 0x3f) { if (debugsw) fprintf (stderr, "invalid BASE64 encoding\n"); return NOTOK; } bits |= value << bitno; test_end: if ((bitno -= 6) < 0) { if (dp + (3 - skip) > ep) goto invalid_digest; *dp++ = (bits >> 16) & 0xff; if (skip < 2) { *dp++ = (bits >> 8) & 0xff; if (skip < 1) *dp++ = bits & 0xff; } bitno = 18; bits = 0L; skip = 0; } break; case '=': if (++skip > 3) goto self_delimiting; goto test_end; } if (bitno != 18) { if (debugsw) fprintf (stderr, "premature ending (bitno %d)\n", bitno); return NOTOK; } self_delimiting: if (dp != ep) { invalid_digest: if (debugsw) { while (*cp) cp++; fprintf (stderr, "invalid MD5 digest (got %d octets)\n", (int)(cp - bp)); } return NOTOK; } if (debugsw) { fprintf (stderr, "MD5 digest="); for (dp = ct->c_digest; dp < ep; dp++) fprintf (stderr, "%02x", *dp & 0xff); fprintf (stderr, "\n"); } return OK; }