FreeCalypso > hg > falcon-mail-tools

annotate f-demime/header.c @ 2:1857d0d5a7bd

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f-demime: fix parsing of Content-* headers
author Mychaela Falconia <falcon@freecalypso.org>
date Sat, 06 May 2023 06:33:26 +0000
parents 7e0d08176f32
children 612c4d0df768
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
0
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
1 /*
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
2 * This module implements initial processing (pass-through and collection)
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
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3 * of message and body part headers.
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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4 */
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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5
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
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6 #include <ctype.h>
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
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7 #include <stdio.h>
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Mychaela Falconia <falcon@freecalypso.org>
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8 #include <stdlib.h>
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Mychaela Falconia <falcon@freecalypso.org>
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9 #include <string.h>
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Mychaela Falconia <falcon@freecalypso.org>
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10 #include <strings.h>
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Mychaela Falconia <falcon@freecalypso.org>
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11 #include "defs.h"
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Mychaela Falconia <falcon@freecalypso.org>
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12
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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13 extern enum msg_hdr_state hdr_state;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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14 extern char cont_type_buf[HDR_BUF_SIZE], cont_te_buf[HDR_BUF_SIZE];
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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15 extern int got_cont_type, got_cont_te;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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16
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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17 static void
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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18 error(line, msg)
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Mychaela Falconia <falcon@freecalypso.org>
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19 char *line, *msg;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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20 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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21 if (got_cont_type) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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22 fputs(cont_type_buf, stdout);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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23 got_cont_type = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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24 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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25 if (got_cont_te) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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26 fputs(cont_te_buf, stdout);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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27 got_cont_te = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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28 }
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Mychaela Falconia <falcon@freecalypso.org>
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29 printf("X-Fdemime-Error: %s\n", msg);
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Mychaela Falconia <falcon@freecalypso.org>
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30 puts(line);
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Mychaela Falconia <falcon@freecalypso.org>
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31 hdr_state = HDR_STATE_ERROR;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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32 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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33
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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34 static void
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Mychaela Falconia <falcon@freecalypso.org>
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35 error_ct_cont(hdr_name)
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Mychaela Falconia <falcon@freecalypso.org>
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36 char *hdr_name;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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37 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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38 printf("X-Fdemime-Error: %s header is too long\n", hdr_name);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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39 }
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Mychaela Falconia <falcon@freecalypso.org>
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40
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Mychaela Falconia <falcon@freecalypso.org>
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41 static void
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Mychaela Falconia <falcon@freecalypso.org>
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42 cont_line(line)
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Mychaela Falconia <falcon@freecalypso.org>
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43 char *line;
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Mychaela Falconia <falcon@freecalypso.org>
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44 {
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Mychaela Falconia <falcon@freecalypso.org>
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45 unsigned prev_len;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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46
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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47 switch (hdr_state) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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48 case HDR_STATE_BEGIN:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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49 error(line, "continuation line at the beginning of header");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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50 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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51 case HDR_STATE_GOTSOME:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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52 puts(line);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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53 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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54 case HDR_STATE_CONT_TYPE:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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55 prev_len = strlen(cont_type_buf);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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56 if (prev_len + strlen(line) + 2 > HDR_BUF_SIZE) {
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
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57 error_ct_cont("Content-Type");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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58 fputs(cont_type_buf, stdout);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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59 puts(line);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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60 hdr_state = HDR_STATE_ERROR;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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61 got_cont_type = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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62 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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63 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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64 sprintf(cont_type_buf + prev_len, "%s\n", line);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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65 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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66 case HDR_STATE_CONT_TE:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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67 prev_len = strlen(cont_te_buf);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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68 if (prev_len + strlen(line) + 2 > HDR_BUF_SIZE) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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69 error_ct_cont("Content-Transfer-Encoding");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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70 fputs(cont_te_buf, stdout);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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71 puts(line);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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72 hdr_state = HDR_STATE_ERROR;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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73 got_cont_te = 0;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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74 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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75 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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76 sprintf(cont_te_buf + prev_len, "%s\n", line);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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77 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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78 default:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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79 fprintf(stderr,
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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80 "f-demime internal error: bad state in cont_line()\n");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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81 abort();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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82 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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83 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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84
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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85 void
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Mychaela Falconia <falcon@freecalypso.org>
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86 header_input_line(line)
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Mychaela Falconia <falcon@freecalypso.org>
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87 char *line;
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Mychaela Falconia <falcon@freecalypso.org>
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88 {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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89 char *cp, savech;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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90 enum msg_hdr_state newhdr;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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91
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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92 if (!line[0]) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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93 process_header_end();
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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94 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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95 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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96 if (hdr_state == HDR_STATE_ERROR) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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97 puts(line);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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98 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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99 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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100 if (line[0] == ' ' || line[0] == '\t') {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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101 cont_line(line);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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102 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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103 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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104 cp = index(line, ':');
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
105 if (!cp) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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106 error(line, "header line has no colon");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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107 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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108 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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109 if (cp == line) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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110 error(line, "null header field name");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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111 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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112 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
113 while (cp[-1] == ' ' || cp[-1] == '\t')
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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114 cp--;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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115 savech = *cp;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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116 *cp = '\0';
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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117 if (!strcasecmp(line, "Content-Type"))
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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118 newhdr = HDR_STATE_CONT_TYPE;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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119 else if (!strcasecmp(line, "Content-Transfer-Encoding"))
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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120 newhdr = HDR_STATE_CONT_TE;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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121 else
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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122 newhdr = HDR_STATE_GOTSOME;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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123 *cp = savech;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
124 switch (newhdr) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
125 case HDR_STATE_CONT_TYPE:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
126 if (got_cont_type) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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127 error(line, "duplicate Content-Type");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
128 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
129 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
130 sprintf(cont_type_buf, "%s\n", line);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
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131 got_cont_type = 1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
132 break;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
133 case HDR_STATE_CONT_TE:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
134 if (got_cont_te) {
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
135 error(line, "duplicate Content-Transfer-Encoding");
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
136 return;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
137 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
138 sprintf(cont_te_buf, "%s\n", line);
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
139 got_cont_te = 1;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
140 break;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
141 default:
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
142 puts(line);
7e0d08176f32 f-demime starting code
Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
143 }
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
144 hdr_state = newhdr;
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Mychaela Falconia <falcon@freecalypso.org>
parents:
diff changeset
145 }