/* * mhbuildsbr.c -- routines to expand/translate MIME composition files * * 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. */ /* * This code was originally part of mhn.c. I split it into * a separate program (mhbuild.c) and then later split it * again (mhbuildsbr.c). But the code still has some of * the mhn.c code in it. This program needs additional * streamlining and removal of unneeded code. */ #include #include #include #include #include #include #include #include #include #include #include #ifdef HAVE_SYS_TIME_H # include #endif #include extern int debugsw; extern int verbosw; extern int ebcdicsw; extern int listsw; extern int rfc934sw; extern int contentidsw; /* cache policies */ extern int rcachesw; /* mhcachesbr.c */ extern int wcachesw; /* mhcachesbr.c */ /* * Directory to place tmp files. This must * be set before these routines are called. */ char *tmp; pid_t xpid = 0; static char prefix[] = "----- =_aaaaaaaaaa"; /* mhmisc.c */ void content_error (char *, CT, char *, ...); /* mhcachesbr.c */ int find_cache (CT, int, int *, char *, char *, int); /* mhfree.c */ void free_content (CT); void free_ctinfo (CT); void free_encoding (CT, int); /* * prototypes */ CT build_mime (char *, int); /* * static prototypes */ static int init_decoded_content (CT); static char *fgetstr (char *, int, FILE *); static int user_content (FILE *, char *, char *, CT *); static void set_id (CT, int); static int compose_content (CT); static int scan_content (CT); static int build_headers (CT); static char *calculate_digest (CT, int); static unsigned char directives_stack[32]; static unsigned int directives_index; static int do_direct(void) { return directives_stack[directives_index]; } static void directive_onoff(int onoff) { if (directives_index >= sizeof(directives_stack) - 1) { fprintf(stderr, "mhbuild: #on/off overflow, continuing\n"); return; } directives_stack[++directives_index] = onoff; } static void directive_init(int onoff) { directives_index = 0; directives_stack[0] = onoff; } static void directive_pop(void) { if (directives_index > 0) directives_index--; else fprintf(stderr, "mhbuild: #pop underflow, continuing\n"); } /* * Main routine for translating composition file * into valid MIME message. It translates the draft * into a content structure (actually a tree of content * structures). This message then can be manipulated * in various ways, including being output via * output_message(). */ CT build_mime (char *infile, int directives) { int compnum, state; char buf[BUFSIZ], name[NAMESZ]; char *cp, *np, *vp; struct multipart *m; struct part **pp; CT ct; FILE *in; directive_init(directives); umask (~m_gmprot ()); /* open the composition draft */ if ((in = fopen (infile, "r")) == NULL) adios (infile, "unable to open for reading"); /* * Allocate space for primary (outside) content */ if ((ct = (CT) calloc (1, sizeof(*ct))) == NULL) adios (NULL, "out of memory"); /* * Allocate structure for handling decoded content * for this part. We don't really need this, but * allocate it to remain consistent. */ init_decoded_content (ct); /* * Parse some of the header fields in the composition * draft into the linked list of header fields for * the new MIME message. */ for (compnum = 1, state = FLD;;) { switch (state = m_getfld (state, name, buf, sizeof(buf), in)) { case FLD: case FLDPLUS: case FLDEOF: compnum++; /* abort if draft has Mime-Version header field */ if (!mh_strcasecmp (name, VRSN_FIELD)) adios (NULL, "draft shouldn't contain %s: field", VRSN_FIELD); /* abort if draft has Content-Transfer-Encoding header field */ if (!mh_strcasecmp (name, ENCODING_FIELD)) adios (NULL, "draft shouldn't contain %s: field", ENCODING_FIELD); /* ignore any Content-Type fields in the header */ if (!mh_strcasecmp (name, TYPE_FIELD)) { while (state == FLDPLUS) state = m_getfld (state, name, buf, sizeof(buf), in); goto finish_field; } /* 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); finish_field: /* if this wasn't the last header field, then continue */ if (state != FLDEOF) continue; /* else fall... */ case FILEEOF: adios (NULL, "draft has empty body -- no directives!"); /* NOTREACHED */ case BODY: case BODYEOF: fseek (in, (long) (-strlen (buf)), SEEK_CUR); break; case LENERR: case FMTERR: adios (NULL, "message format error in component #%d", compnum); default: adios (NULL, "getfld() returned %d", state); } break; } /* * Now add the MIME-Version header field * to the list of header fields. */ np = add (VRSN_FIELD, NULL); vp = concat (" ", VRSN_VALUE, "\n", NULL); add_header (ct, np, vp); /* * We initally assume we will find multiple contents in the * draft. So create a multipart/mixed content to hold everything. * We can remove this later, if it is not needed. */ if (get_ctinfo ("multipart/mixed", ct, 0) == NOTOK) done (1); ct->c_type = CT_MULTIPART; ct->c_subtype = MULTI_MIXED; ct->c_file = add (infile, NULL); if ((m = (struct multipart *) calloc (1, sizeof(*m))) == NULL) adios (NULL, "out of memory"); ct->c_ctparams = (void *) m; pp = &m->mp_parts; /* * read and parse the composition file * and the directives it contains. */ while (fgetstr (buf, sizeof(buf) - 1, in)) { struct part *part; CT p; if (user_content (in, infile, buf, &p) == DONE) { admonish (NULL, "ignoring spurious #end"); continue; } if (!p) continue; if ((part = (struct part *) calloc (1, sizeof(*part))) == NULL) adios (NULL, "out of memory"); *pp = part; pp = &part->mp_next; part->mp_part = p; } /* * close the composition draft since * it's not needed any longer. */ fclose (in); /* check if any contents were found */ if (!m->mp_parts) adios (NULL, "no content directives found"); /* * If only one content was found, then remove and * free the outer multipart content. */ if (!m->mp_parts->mp_next) { CT p; p = m->mp_parts->mp_part; m->mp_parts->mp_part = NULL; /* move header fields */ p->c_first_hf = ct->c_first_hf; p->c_last_hf = ct->c_last_hf; ct->c_first_hf = NULL; ct->c_last_hf = NULL; free_content (ct); ct = p; } else { set_id (ct, 1); } /* * Fill out, or expand directives. Parse and execute * commands specified by profile composition strings. */ compose_content (ct); if ((cp = strchr(prefix, 'a')) == NULL) adios (NULL, "internal error(4)"); /* * Scan the contents. Choose a transfer encoding, and * check if prefix for multipart boundary clashes with * any of the contents. */ while (scan_content (ct) == NOTOK) { if (*cp < 'z') { (*cp)++; } else { if (*++cp == 0) adios (NULL, "giving up trying to find a unique delimiter string"); else (*cp)++; } } /* Build the rest of the header field structures */ build_headers (ct); return ct; } /* * Set up structures for placing unencoded * content when building parts. */ static int init_decoded_content (CT ct) { CE ce; if ((ce = (CE) calloc (1, sizeof(*ce))) == NULL) adios (NULL, "out of memory"); ct->c_cefile = ce; ct->c_ceopenfnx = open7Bit; /* since unencoded */ ct->c_ceclosefnx = close_encoding; ct->c_cesizefnx = NULL; /* since unencoded */ return OK; } static char * fgetstr (char *s, int n, FILE *stream) { char *cp, *ep; int o_n = n; while(1) { for (ep = (cp = s) + o_n; cp < ep; ) { int i; if (!fgets (cp, n, stream)) return (cp != s ? s : NULL); if (cp == s && *cp != '#') return s; cp += (i = strlen (cp)) - 1; if (i <= 1 || *cp-- != '\n' || *cp != '\\') break; *cp = '\0'; n -= (i - 2); } if (strcmp(s, "#on\n") == 0) { directive_onoff(1); } else if (strcmp(s, "#off\n") == 0) { directive_onoff(0); } else if (strcmp(s, "#pop\n") == 0) { directive_pop(); } else { break; } } return s; } /* * Parse the composition draft for text and directives. * Do initial setup of Content structure. */ static int user_content (FILE *in, char *file, char *buf, CT *ctp) { int extrnal, vrsn; unsigned char *cp; char **ap; char buffer[BUFSIZ]; struct multipart *m; struct part **pp; struct stat st; struct str2init *s2i; CI ci; CT ct; CE ce; if (buf[0] == '\n' || (do_direct() && strcmp (buf, "#\n") == 0)) { *ctp = NULL; return OK; } /* allocate basic Content structure */ if ((ct = (CT) calloc (1, sizeof(*ct))) == NULL) adios (NULL, "out of memory"); *ctp = ct; /* allocate basic structure for handling decoded content */ init_decoded_content (ct); ce = ct->c_cefile; ci = &ct->c_ctinfo; set_id (ct, 0); /* * Handle inline text. Check if line * is one of the following forms: * * 1) doesn't begin with '#' (implicit directive) * 2) begins with "##" (implicit directive) * 3) begins with "#<" */ if (!do_direct() || buf[0] != '#' || buf[1] == '#' || buf[1] == '<') { int headers; int inlineD; long pos; char content[BUFSIZ]; FILE *out; char *cp; cp = m_mktemp2(NULL, invo_name, NULL, &out); if (cp == NULL) adios("mhbuildsbr", "unable to create temporary file"); /* use a temp file to collect the plain text lines */ ce->ce_file = add (cp, NULL); ce->ce_unlink = 1; if (do_direct() && (buf[0] == '#' && buf[1] == '<')) { strncpy (content, buf + 2, sizeof(content)); inlineD = 1; goto rock_and_roll; } else { inlineD = 0; } /* the directive is implicit */ strncpy (content, "text/plain", sizeof(content)); headers = 0; strncpy (buffer, (!do_direct() || buf[0] != '#') ? buf : buf + 1, sizeof(buffer)); for (;;) { int i; if (headers >= 0 && do_direct() && uprf (buffer, DESCR_FIELD) && buffer[i = strlen (DESCR_FIELD)] == ':') { headers = 1; again_descr: ct->c_descr = add (buffer + i + 1, ct->c_descr); if (!fgetstr (buffer, sizeof(buffer) - 1, in)) adios (NULL, "end-of-file after %s: field in plaintext", DESCR_FIELD); switch (buffer[0]) { case ' ': case '\t': i = -1; goto again_descr; case '#': adios (NULL, "#-directive after %s: field in plaintext", DESCR_FIELD); /* NOTREACHED */ default: break; } } if (headers >= 0 && do_direct() && uprf (buffer, DISPO_FIELD) && buffer[i = strlen (DISPO_FIELD)] == ':') { headers = 1; again_dispo: ct->c_dispo = add (buffer + i + 1, ct->c_dispo); if (!fgetstr (buffer, sizeof(buffer) - 1, in)) adios (NULL, "end-of-file after %s: field in plaintext", DISPO_FIELD); switch (buffer[0]) { case ' ': case '\t': i = -1; goto again_dispo; case '#': adios (NULL, "#-directive after %s: field in plaintext", DISPO_FIELD); /* NOTREACHED */ default: break; } } if (headers != 1 || buffer[0] != '\n') fputs (buffer, out); rock_and_roll: headers = -1; pos = ftell (in); if ((cp = fgetstr (buffer, sizeof(buffer) - 1, in)) == NULL) break; if (do_direct() && buffer[0] == '#') { char *bp; if (buffer[1] != '#') break; for (cp = (bp = buffer) + 1; *cp; cp++) *bp++ = *cp; *bp = '\0'; } } if (listsw) ct->c_end = ftell (out); fclose (out); /* parse content type */ if (get_ctinfo (content, ct, inlineD) == NOTOK) done (1); 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++; /* * check type specified (possibly implicitly) */ switch (ct->c_type = s2i->si_val) { case CT_MESSAGE: if (!mh_strcasecmp (ci->ci_subtype, "rfc822")) { ct->c_encoding = CE_7BIT; goto call_init; } /* else fall... */ case CT_MULTIPART: adios (NULL, "it doesn't make sense to define an in-line %s content", ct->c_type == CT_MESSAGE ? "message" : "multipart"); /* NOTREACHED */ default: call_init: if ((ct->c_ctinitfnx = s2i->si_init)) (*ct->c_ctinitfnx) (ct); break; } if (cp) fseek (in, pos, SEEK_SET); return OK; } /* * If we've reached this point, the next line * must be some type of explicit directive. */ /* check if directive is external-type */ extrnal = (buf[1] == '@'); /* parse directive */ if (get_ctinfo (buf + (extrnal ? 2 : 1), ct, 1) == NOTOK) done (1); /* check directive against the list of MIME types */ for (s2i = str2cts; s2i->si_key; s2i++) if (!mh_strcasecmp (ci->ci_type, s2i->si_key)) break; /* * Check if the directive specified a valid type. * This will happen if it was one of the following forms: * * #type/subtype (or) * #@type/subtype */ if (s2i->si_key) { if (!ci->ci_subtype) adios (NULL, "missing subtype in \"#%s\"", ci->ci_type); switch (ct->c_type = s2i->si_val) { case CT_MULTIPART: adios (NULL, "use \"#begin ... #end\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype); /* NOTREACHED */ case CT_MESSAGE: if (!mh_strcasecmp (ci->ci_subtype, "partial")) adios (NULL, "sorry, \"#%s/%s\" isn't supported", ci->ci_type, ci->ci_subtype); if (!mh_strcasecmp (ci->ci_subtype, "external-body")) adios (NULL, "use \"#@type/subtype ... [] ...\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype); use_forw: adios (NULL, "use \"#forw [+folder] [msgs]\" instead of \"#%s/%s\"", ci->ci_type, ci->ci_subtype); /* NOTREACHED */ default: if ((ct->c_ctinitfnx = s2i->si_init)) (*ct->c_ctinitfnx) (ct); break; } /* * #@type/subtype (external types directive) */ if (extrnal) { struct exbody *e; CT p; if (!ci->ci_magic) adios (NULL, "need external information for \"#@%s/%s\"", ci->ci_type, ci->ci_subtype); p = ct; snprintf (buffer, sizeof(buffer), "message/external-body; %s", ci->ci_magic); free (ci->ci_magic); ci->ci_magic = NULL; /* * Since we are using the current Content structure to * hold information about the type of the external * reference, we need to create another Content structure * for the message/external-body to wrap it in. */ if ((ct = (CT) calloc (1, sizeof(*ct))) == NULL) adios (NULL, "out of memory"); *ctp = ct; ci = &ct->c_ctinfo; if (get_ctinfo (buffer, ct, 0) == NOTOK) done (1); ct->c_type = CT_MESSAGE; ct->c_subtype = MESSAGE_EXTERNAL; if ((e = (struct exbody *) calloc (1, sizeof(*e))) == NULL) adios (NULL, "out of memory"); ct->c_ctparams = (void *) e; e->eb_parent = ct; e->eb_content = p; p->c_ctexbody = e; if (params_external (ct, 1) == NOTOK) done (1); return OK; } /* Handle [file] argument */ if (ci->ci_magic) { /* check if specifies command to execute */ if (*ci->ci_magic == '|' || *ci->ci_magic == '!') { for (cp = ci->ci_magic + 1; isspace (*cp); cp++) continue; if (!*cp) adios (NULL, "empty pipe command for #%s directive", ci->ci_type); cp = add (cp, NULL); free (ci->ci_magic); ci->ci_magic = cp; } else { /* record filename of decoded contents */ ce->ce_file = ci->ci_magic; if (access (ce->ce_file, R_OK) == NOTOK) adios ("reading", "unable to access %s for", ce->ce_file); if (listsw && stat (ce->ce_file, &st) != NOTOK) ct->c_end = (long) st.st_size; ci->ci_magic = NULL; } return OK; } /* * No [file] argument, so check profile for * method to compose content. */ snprintf (buffer, sizeof(buffer), "%s-compose-%s/%s", invo_name, ci->ci_type, ci->ci_subtype); if ((cp = context_find (buffer)) == NULL || *cp == '\0') { snprintf (buffer, sizeof(buffer), "%s-compose-%s", invo_name, ci->ci_type); if ((cp = context_find (buffer)) == NULL || *cp == '\0') { content_error (NULL, ct, "don't know how to compose content"); done (1); } } ci->ci_magic = add (cp, NULL); return OK; } if (extrnal) adios (NULL, "external definition not allowed for \"#%s\"", ci->ci_type); /* * Message directive * #forw [+folder] [msgs] */ if (!mh_strcasecmp (ci->ci_type, "forw")) { int msgnum; char *folder, *arguments[MAXARGS]; struct msgs *mp; if (ci->ci_magic) { ap = brkstring (ci->ci_magic, " ", "\n"); copyip (ap, arguments, MAXARGS); } else { arguments[0] = "cur"; arguments[1] = NULL; } folder = NULL; /* search the arguments for a folder name */ for (ap = arguments; *ap; ap++) { cp = *ap; if (*cp == '+' || *cp == '@') { if (folder) adios (NULL, "only one folder per #forw directive"); else folder = pluspath (cp); } } /* else, use the current folder */ if (!folder) folder = add (getfolder (1), NULL); if (!(mp = folder_read (folder))) adios (NULL, "unable to read folder %s", folder); for (ap = arguments; *ap; ap++) { cp = *ap; if (*cp != '+' && *cp != '@') if (!m_convert (mp, cp)) done (1); } free (folder); free_ctinfo (ct); /* * If there is more than one message to include, make this * a content of type "multipart/digest" and insert each message * as a subpart. If there is only one message, then make this * a content of type "message/rfc822". */ if (mp->numsel > 1) { /* we are forwarding multiple messages */ if (get_ctinfo ("multipart/digest", ct, 0) == NOTOK) done (1); ct->c_type = CT_MULTIPART; ct->c_subtype = MULTI_DIGEST; if ((m = (struct multipart *) calloc (1, sizeof(*m))) == NULL) adios (NULL, "out of memory"); ct->c_ctparams = (void *) m; pp = &m->mp_parts; for (msgnum = mp->lowsel; msgnum <= mp->hghsel; msgnum++) { if (is_selected(mp, msgnum)) { struct part *part; CT p; CE pe; if ((p = (CT) calloc (1, sizeof(*p))) == NULL) adios (NULL, "out of memory"); init_decoded_content (p); pe = p->c_cefile; if (get_ctinfo ("message/rfc822", p, 0) == NOTOK) done (1); p->c_type = CT_MESSAGE; p->c_subtype = MESSAGE_RFC822; snprintf (buffer, sizeof(buffer), "%s/%d", mp->foldpath, msgnum); pe->ce_file = add (buffer, NULL); if (listsw && stat (pe->ce_file, &st) != NOTOK) p->c_end = (long) st.st_size; if ((part = (struct part *) calloc (1, sizeof(*part))) == NULL) adios (NULL, "out of memory"); *pp = part; pp = &part->mp_next; part->mp_part = p; } } } else { /* we are forwarding one message */ if (get_ctinfo ("message/rfc822", ct, 0) == NOTOK) done (1); ct->c_type = CT_MESSAGE; ct->c_subtype = MESSAGE_RFC822; msgnum = mp->lowsel; snprintf (buffer, sizeof(buffer), "%s/%d", mp->foldpath, msgnum); ce->ce_file = add (buffer, NULL); if (listsw && stat (ce->ce_file, &st) != NOTOK) ct->c_end = (long) st.st_size; } folder_free (mp); /* free folder/message structure */ return OK; } /* * #end */ if (!mh_strcasecmp (ci->ci_type, "end")) { free_content (ct); *ctp = NULL; return DONE; } /* * #begin [ alternative | parallel ] */ if (!mh_strcasecmp (ci->ci_type, "begin")) { if (!ci->ci_magic) { vrsn = MULTI_MIXED; cp = SubMultiPart[vrsn - 1].kv_key; } else if (!mh_strcasecmp (ci->ci_magic, "alternative")) { vrsn = MULTI_ALTERNATE; cp = SubMultiPart[vrsn - 1].kv_key; } else if (!mh_strcasecmp (ci->ci_magic, "parallel")) { vrsn = MULTI_PARALLEL; cp = SubMultiPart[vrsn - 1].kv_key; } else if (uprf (ci->ci_magic, "digest")) { goto use_forw; } else { vrsn = MULTI_UNKNOWN; cp = ci->ci_magic; } free_ctinfo (ct); snprintf (buffer, sizeof(buffer), "multipart/%s", cp); if (get_ctinfo (buffer, ct, 0) == NOTOK) done (1); ct->c_type = CT_MULTIPART; ct->c_subtype = vrsn; if ((m = (struct multipart *) calloc (1, sizeof(*m))) == NULL) adios (NULL, "out of memory"); ct->c_ctparams = (void *) m; pp = &m->mp_parts; while (fgetstr (buffer, sizeof(buffer) - 1, in)) { struct part *part; CT p; if (user_content (in, file, buffer, &p) == DONE) { if (!m->mp_parts) adios (NULL, "empty \"#begin ... #end\" sequence"); return OK; } if (!p) continue; if ((part = (struct part *) calloc (1, sizeof(*part))) == NULL) adios (NULL, "out of memory"); *pp = part; pp = &part->mp_next; part->mp_part = p; } admonish (NULL, "premature end-of-file, missing #end"); return OK; } /* * Unknown directive */ adios (NULL, "unknown directive \"#%s\"", ci->ci_type); return NOTOK; /* NOT REACHED */ } static void set_id (CT ct, int top) { char contentid[BUFSIZ]; static int partno; static time_t clock = 0; static char *msgfmt; if (clock == 0) { time (&clock); snprintf (contentid, sizeof(contentid), "%s\n", message_id (clock, 1)); partno = 0; msgfmt = getcpy(contentid); } snprintf (contentid, sizeof(contentid), msgfmt, top ? 0 : ++partno); ct->c_id = getcpy (contentid); } static char ebcdicsafe[0x100] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 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, 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, 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 }; /* * Fill out, or expand the various contents in the composition * draft. Read-in any necessary files. Parse and execute any * commands specified by profile composition strings. */ static int compose_content (CT ct) { CE ce = ct->c_cefile; switch (ct->c_type) { case CT_MULTIPART: { int partnum; char *pp; char partnam[BUFSIZ]; struct multipart *m = (struct multipart *) ct->c_ctparams; struct part *part; if (ct->c_partno) { snprintf (partnam, sizeof(partnam), "%s.", ct->c_partno); pp = partnam + strlen (partnam); } else { pp = partnam; } /* first, we call compose_content on all the subparts */ for (part = m->mp_parts, partnum = 1; part; part = part->mp_next, partnum++) { CT p = part->mp_part; sprintf (pp, "%d", partnum); p->c_partno = add (partnam, NULL); if (compose_content (p) == NOTOK) return NOTOK; } /* * If the -rfc934mode switch is given, then check all * the subparts of a multipart/digest. If they are all * message/rfc822, then mark this content and all * subparts with the rfc934 compatibility mode flag. */ if (rfc934sw && ct->c_subtype == MULTI_DIGEST) { int is934 = 1; for (part = m->mp_parts; part; part = part->mp_next) { CT p = part->mp_part; if (p->c_subtype != MESSAGE_RFC822) { is934 = 0; break; } } ct->c_rfc934 = is934; for (part = m->mp_parts; part; part = part->mp_next) { CT p = part->mp_part; if ((p->c_rfc934 = is934)) p->c_end++; } } if (listsw) { ct->c_end = (partnum = strlen (prefix) + 2) + 2; if (ct->c_rfc934) ct->c_end += 1; for (part = m->mp_parts; part; part = part->mp_next) ct->c_end += part->mp_part->c_end + partnum; } } break; case CT_MESSAGE: /* Nothing to do for type message */ break; /* * Discrete types (text/application/audio/image/video) */ default: if (!ce->ce_file) { pid_t child_id; int i, xstdout, len, buflen; char *bp, **ap, *cp; char *vec[4], buffer[BUFSIZ]; FILE *out; CI ci = &ct->c_ctinfo; char *tfile = NULL; if (!(cp = ci->ci_magic)) adios (NULL, "internal error(5)"); tfile = m_mktemp2(NULL, invo_name, NULL, NULL); if (tfile == NULL) { adios("mhbuildsbr", "unable to create temporary file"); } ce->ce_file = add (tfile, NULL); ce->ce_unlink = 1; xstdout = 0; /* Get buffer ready to go */ bp = buffer; bp[0] = '\0'; buflen = sizeof(buffer); /* * Parse composition string into buffer */ for ( ; *cp; cp++) { if (*cp == '%') { switch (*++cp) { case 'a': { /* insert parameters from directive */ char **ep; char *s = ""; for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) { snprintf (bp, buflen, "%s%s=\"%s\"", s, *ap, *ep); len = strlen (bp); bp += len; buflen -= len; s = " "; } } break; case 'F': /* %f, and stdout is not-redirected */ xstdout = 1; /* and fall... */ case 'f': /* * insert temporary filename where * content should be written */ snprintf (bp, buflen, "%s", ce->ce_file); break; case 's': /* insert content subtype */ strncpy (bp, ci->ci_subtype, buflen); break; case '%': /* insert character % */ goto raw; default: *bp++ = *--cp; *bp = '\0'; buflen--; continue; } len = strlen (bp); bp += len; buflen -= len; } else { raw: *bp++ = *cp; *bp = '\0'; buflen--; } } if (verbosw) printf ("composing content %s/%s from command\n\t%s\n", ci->ci_type, ci->ci_subtype, buffer); fflush (stdout); /* not sure if need for -noverbose */ vec[0] = "/bin/sh"; vec[1] = "-c"; vec[2] = buffer; vec[3] = NULL; if ((out = fopen (ce->ce_file, "w")) == NULL) adios (ce->ce_file, "unable to open for writing"); for (i = 0; (child_id = vfork()) == NOTOK && i > 5; i++) sleep (5); switch (child_id) { case NOTOK: adios ("fork", "unable to fork"); /* NOTREACHED */ case OK: if (!xstdout) dup2 (fileno (out), 1); close (fileno (out)); execvp ("/bin/sh", vec); fprintf (stderr, "unable to exec "); perror ("/bin/sh"); _exit (-1); /* NOTREACHED */ default: fclose (out); if (pidXwait(child_id, NULL)) done (1); break; } } /* Check size of file */ if (listsw && ct->c_end == 0L) { struct stat st; if (stat (ce->ce_file, &st) != NOTOK) ct->c_end = (long) st.st_size; } break; } return OK; } /* * Scan the content. * * 1) choose a transfer encoding. * 2) check for clashes with multipart boundary string. * 3) for text content, figure out which character set is being used. * * If there is a clash with one of the contents and the multipart boundary, * this function will exit with NOTOK. This will cause the scanning process * to be repeated with a different multipart boundary. It is possible * (although highly unlikely) that this scan will be repeated multiple times. */ static int scan_content (CT ct) { int len; int check8bit = 0, contains8bit = 0; /* check if contains 8bit data */ int checklinelen = 0, linelen = 0; /* check for long lines */ int checkboundary = 0, boundaryclash = 0; /* check if clashes with multipart boundary */ int checklinespace = 0, linespace = 0; /* check if any line ends with space */ int checkebcdic = 0, ebcdicunsafe = 0; /* check if contains ebcdic unsafe characters */ unsigned char *cp = NULL, buffer[BUFSIZ]; struct text *t = NULL; FILE *in = NULL; CE ce = ct->c_cefile; /* * handle multipart by scanning all subparts * and then checking their encoding. */ if (ct->c_type == CT_MULTIPART) { struct multipart *m = (struct multipart *) ct->c_ctparams; struct part *part; /* initially mark the domain of enclosing multipart as 7bit */ ct->c_encoding = CE_7BIT; for (part = m->mp_parts; part; part = part->mp_next) { CT p = part->mp_part; if (scan_content (p) == NOTOK) /* choose encoding for subpart */ return NOTOK; /* if necessary, enlarge encoding for enclosing multipart */ if (p->c_encoding == CE_BINARY) ct->c_encoding = CE_BINARY; if (p->c_encoding == CE_8BIT && ct->c_encoding != CE_BINARY) ct->c_encoding = CE_8BIT; } return OK; } /* * Decide what to check while scanning this content. */ switch (ct->c_type) { case CT_TEXT: check8bit = 1; checkboundary = 1; if (ct->c_subtype == TEXT_PLAIN) { checkebcdic = 0; checklinelen = 0; checklinespace = 0; } else { checkebcdic = ebcdicsw; checklinelen = 1; checklinespace = 1; } break; case CT_APPLICATION: check8bit = 1; checkebcdic = ebcdicsw; checklinelen = 1; checklinespace = 1; checkboundary = 1; break; case CT_MESSAGE: check8bit = 0; checkebcdic = 0; checklinelen = 0; checklinespace = 0; /* don't check anything for message/external */ if (ct->c_subtype == MESSAGE_EXTERNAL) checkboundary = 0; else checkboundary = 1; break; case CT_AUDIO: case CT_IMAGE: case CT_VIDEO: /* * Don't check anything for these types, * since we are forcing use of base64. */ check8bit = 0; checkebcdic = 0; checklinelen = 0; checklinespace = 0; checkboundary = 0; break; } /* * Scan the unencoded content */ if (check8bit || checklinelen || checklinespace || checkboundary) { if ((in = fopen (ce->ce_file, "r")) == NULL) adios (ce->ce_file, "unable to open for reading"); len = strlen (prefix); while (fgets (buffer, sizeof(buffer) - 1, in)) { /* * Check for 8bit data. */ if (check8bit) { for (cp = buffer; *cp; cp++) { if (!isascii (*cp)) { contains8bit = 1; check8bit = 0; /* no need to keep checking */ } /* * Check if character is ebcdic-safe. We only check * this if also checking for 8bit data. */ if (checkebcdic && !ebcdicsafe[*cp & 0xff]) { ebcdicunsafe = 1; checkebcdic = 0; /* no need to keep checking */ } } } /* * Check line length. */ if (checklinelen && (strlen (buffer) > CPERLIN + 1)) { linelen = 1; checklinelen = 0; /* no need to keep checking */ } /* * Check if line ends with a space. */ if (checklinespace && (cp = buffer + strlen (buffer) - 2) > buffer && isspace (*cp)) { linespace = 1; checklinespace = 0; /* no need to keep checking */ } /* * Check if content contains a line that clashes * with our standard boundary for multipart messages. */ if (checkboundary && buffer[0] == '-' && buffer[1] == '-') { for (cp = buffer + strlen (buffer) - 1; cp >= buffer; cp--) if (!isspace (*cp)) break; *++cp = '\0'; if (!strncmp(buffer + 2, prefix, len) && isdigit(buffer[2 + len])) { boundaryclash = 1; checkboundary = 0; /* no need to keep checking */ } } } fclose (in); } /* * Decide which transfer encoding to use. */ switch (ct->c_type) { case CT_TEXT: /* * If the text content didn't specify a character * set, we need to figure out which one was used. */ t = (struct text *) ct->c_ctparams; if (t->tx_charset == CHARSET_UNSPECIFIED) { CI ci = &ct->c_ctinfo; char **ap, **ep; for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) continue; if (contains8bit) { t->tx_charset = CHARSET_UNKNOWN; *ap = concat ("charset=", write_charset_8bit(), NULL); } else { t->tx_charset = CHARSET_USASCII; *ap = add ("charset=us-ascii", NULL); } cp = strchr(*ap++, '='); *ap = NULL; *cp++ = '\0'; *ep = cp; } if (contains8bit || ebcdicunsafe || linelen || linespace || checksw) ct->c_encoding = CE_QUOTED; else ct->c_encoding = CE_7BIT; break; case CT_APPLICATION: /* For application type, use base64, except when postscript */ if (contains8bit || ebcdicunsafe || linelen || linespace || checksw) ct->c_encoding = (ct->c_subtype == APPLICATION_POSTSCRIPT) ? CE_QUOTED : CE_BASE64; else ct->c_encoding = CE_7BIT; break; case CT_MESSAGE: ct->c_encoding = CE_7BIT; break; case CT_AUDIO: case CT_IMAGE: case CT_VIDEO: /* For audio, image, and video contents, just use base64 */ ct->c_encoding = CE_BASE64; break; } return (boundaryclash ? NOTOK : OK); } /* * Scan the content structures, and build header * fields that will need to be output into the * message. */ static int build_headers (CT ct) { int cc, mailbody, len; char **ap, **ep; char *np, *vp, buffer[BUFSIZ]; CI ci = &ct->c_ctinfo; /* * If message is type multipart, then add the multipart * boundary to the list of attribute/value pairs. */ if (ct->c_type == CT_MULTIPART) { char *cp; static int level = 0; /* store nesting level */ ap = ci->ci_attrs; ep = ci->ci_values; snprintf (buffer, sizeof(buffer), "boundary=%s%d", prefix, level++); cp = strchr(*ap++ = add (buffer, NULL), '='); *ap = NULL; *cp++ = '\0'; *ep = cp; } /* * Skip the output of Content-Type, parameters, content * description and disposition, and Content-ID if the * content is of type "message" and the rfc934 compatibility * flag is set (which means we are inside multipart/digest * and the switch -rfc934mode was given). */ if (ct->c_type == CT_MESSAGE && ct->c_rfc934) goto skip_headers; /* * output the content type and subtype */ np = add (TYPE_FIELD, NULL); vp = concat (" ", ci->ci_type, "/", ci->ci_subtype, NULL); /* keep track of length of line */ len = strlen (TYPE_FIELD) + strlen (ci->ci_type) + strlen (ci->ci_subtype) + 3; mailbody = ct->c_type == CT_MESSAGE && ct->c_subtype == MESSAGE_EXTERNAL && ((struct exbody *) ct->c_ctparams)->eb_body; /* * Append the attribute/value pairs to * the end of the Content-Type line. */ for (ap = ci->ci_attrs, ep = ci->ci_values; *ap; ap++, ep++) { if (mailbody && !mh_strcasecmp (*ap, "body")) continue; vp = add (";", vp); len++; snprintf (buffer, sizeof(buffer), "%s=\"%s\"", *ap, *ep); if (len + 1 + (cc = strlen (buffer)) >= CPERLIN) { vp = add ("\n\t", vp); len = 8; } else { vp = add (" ", vp); len++; } vp = add (buffer, vp); len += cc; } /* * Append any RFC-822 comment to the end of * the Content-Type line. */ if (ci->ci_comment) { snprintf (buffer, sizeof(buffer), "(%s)", ci->ci_comment); if (len + 1 + (cc = 2 + strlen (ci->ci_comment)) >= CPERLIN) { vp = add ("\n\t", vp); len = 8; } else { vp = add (" ", vp); len++; } vp = add (buffer, vp); len += cc; } vp = add ("\n", vp); add_header (ct, np, vp); /* * output the Content-ID, unless disabled by -nocontentid */ if (contentidsw && ct->c_id) { np = add (ID_FIELD, NULL); vp = concat (" ", ct->c_id, NULL); add_header (ct, np, vp); } /* * output the Content-Description */ if (ct->c_descr) { np = add (DESCR_FIELD, NULL); vp = concat (" ", ct->c_descr, NULL); add_header (ct, np, vp); } /* * output the Content-Disposition */ if (ct->c_dispo) { np = add (DISPO_FIELD, NULL); vp = concat (" ", ct->c_dispo, NULL); add_header (ct, np, vp); } skip_headers: /* * If this is the internal content structure for a * "message/external", then we are done with the * headers (since it has no body). */ if (ct->c_ctexbody) return OK; /* * output the Content-MD5 */ if (checksw) { np = add (MD5_FIELD, NULL); vp = calculate_digest (ct, (ct->c_encoding == CE_QUOTED) ? 1 : 0); add_header (ct, np, vp); } /* * output the Content-Transfer-Encoding */ switch (ct->c_encoding) { case CE_7BIT: /* Nothing to output */ #if 0 np = add (ENCODING_FIELD, NULL); vp = concat (" ", "7bit", "\n", NULL); add_header (ct, np, vp); #endif break; case CE_8BIT: if (ct->c_type == CT_MESSAGE) adios (NULL, "internal error, invalid encoding"); np = add (ENCODING_FIELD, NULL); vp = concat (" ", "8bit", "\n", NULL); add_header (ct, np, vp); break; case CE_QUOTED: if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART) adios (NULL, "internal error, invalid encoding"); np = add (ENCODING_FIELD, NULL); vp = concat (" ", "quoted-printable", "\n", NULL); add_header (ct, np, vp); break; case CE_BASE64: if (ct->c_type == CT_MESSAGE || ct->c_type == CT_MULTIPART) adios (NULL, "internal error, invalid encoding"); np = add (ENCODING_FIELD, NULL); vp = concat (" ", "base64", "\n", NULL); add_header (ct, np, vp); break; case CE_BINARY: if (ct->c_type == CT_MESSAGE) adios (NULL, "internal error, invalid encoding"); np = add (ENCODING_FIELD, NULL); vp = concat (" ", "binary", "\n", NULL); add_header (ct, np, vp); break; default: adios (NULL, "unknown transfer encoding in content"); break; } /* * Additional content specific header processing */ switch (ct->c_type) { case CT_MULTIPART: { struct multipart *m; struct part *part; m = (struct multipart *) ct->c_ctparams; for (part = m->mp_parts; part; part = part->mp_next) { CT p; p = part->mp_part; build_headers (p); } } break; case CT_MESSAGE: if (ct->c_subtype == MESSAGE_EXTERNAL) { struct exbody *e; e = (struct exbody *) ct->c_ctparams; build_headers (e->eb_content); } break; default: /* Nothing to do */ break; } return OK; } static char nib2b64[0x40+1] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; static char * calculate_digest (CT ct, int asciiP) { int cc; char buffer[BUFSIZ], *vp, *op; unsigned char *dp; unsigned char digest[16]; unsigned char outbuf[25]; MD5_CTX mdContext; CE ce = ct->c_cefile; char *infilename = ce->ce_file ? ce->ce_file : ct->c_file; FILE *in; /* open content */ if ((in = fopen (infilename, "r")) == NULL) adios (infilename, "unable to open for reading"); /* Initialize md5 context */ MD5Init (&mdContext); /* calculate md5 message digest */ if (asciiP) { while (fgets (buffer, sizeof(buffer) - 1, in)) { char c, *cp; cp = buffer + strlen (buffer) - 1; if ((c = *cp) == '\n') *cp = '\0'; MD5Update (&mdContext, (unsigned char *) buffer, (unsigned int) strlen (buffer)); if (c == '\n') MD5Update (&mdContext, (unsigned char *) "\r\n", 2); } } else { while ((cc = fread (buffer, sizeof(*buffer), sizeof(buffer), in)) > 0) MD5Update (&mdContext, (unsigned char *) buffer, (unsigned int) cc); } /* md5 finalization. Write digest and zero md5 context */ MD5Final (digest, &mdContext); /* close content */ fclose (in); /* print debugging info */ if (debugsw) { unsigned char *ep; fprintf (stderr, "MD5 digest="); for (ep = (dp = digest) + sizeof(digest) / sizeof(digest[0]); dp < ep; dp++) fprintf (stderr, "%02x", *dp & 0xff); fprintf (stderr, "\n"); } /* encode the digest using base64 */ for (dp = digest, op = outbuf, cc = sizeof(digest) / sizeof(digest[0]); cc > 0; cc -= 3, op += 4) { unsigned long bits; char *bp; bits = (*dp++ & 0xff) << 16; if (cc > 1) { bits |= (*dp++ & 0xff) << 8; if (cc > 2) bits |= *dp++ & 0xff; } for (bp = op + 4; bp > op; bits >>= 6) *--bp = nib2b64[bits & 0x3f]; if (cc < 3) { *(op + 3) = '='; if (cc < 2) *(op + 2) = '='; } } /* null terminate string */ outbuf[24] = '\0'; /* now make copy and return string */ vp = concat (" ", outbuf, "\n", NULL); return vp; }