FreeCalypso > hg > falcon-mail-tools
annotate f-demime/header.c @ 4:612c4d0df768
f-demime: rework for unboundedly long lines
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Sat, 06 May 2023 09:02:12 +0000 |
parents | 7e0d08176f32 |
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1 /* |
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2 * This module implements initial processing (pass-through and collection) |
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3 * of message and body part headers. |
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4 */ |
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5 |
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6 #include <ctype.h> |
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7 #include <stdio.h> |
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8 #include <stdlib.h> |
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9 #include <string.h> |
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10 #include <strings.h> |
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11 #include "defs.h" |
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12 |
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13 extern enum msg_hdr_state hdr_state; |
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14 extern char cont_type_buf[HDR_BUF_SIZE], cont_te_buf[HDR_BUF_SIZE]; |
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15 extern int got_cont_type, got_cont_te; |
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16 |
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17 static void |
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18 error(line, msg) |
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19 char *line, *msg; |
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20 { |
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21 if (got_cont_type) { |
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22 fputs(cont_type_buf, stdout); |
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23 got_cont_type = 0; |
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24 } |
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25 if (got_cont_te) { |
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26 fputs(cont_te_buf, stdout); |
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27 got_cont_te = 0; |
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28 } |
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29 printf("X-Fdemime-Error: %s\n", msg); |
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30 fputs(line, stdout); |
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31 hdr_state = HDR_STATE_ERROR; |
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32 } |
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33 |
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34 static void |
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35 error_ct_cont(hdr_name) |
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36 char *hdr_name; |
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37 { |
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38 printf("X-Fdemime-Error: %s header is too long\n", hdr_name); |
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39 } |
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40 |
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41 static void |
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42 cont_line(line) |
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43 char *line; |
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44 { |
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45 unsigned prev_len; |
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46 |
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47 switch (hdr_state) { |
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48 case HDR_STATE_BEGIN: |
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49 error(line, "continuation line at the beginning of header"); |
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50 return; |
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51 case HDR_STATE_GOTSOME: |
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52 fputs(line, stdout); |
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53 return; |
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54 case HDR_STATE_CONT_TYPE: |
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55 prev_len = strlen(cont_type_buf); |
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56 if (prev_len + strlen(line) + 1 > HDR_BUF_SIZE) { |
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57 error_ct_cont("Content-Type"); |
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58 fputs(cont_type_buf, stdout); |
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59 fputs(line, stdout); |
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60 hdr_state = HDR_STATE_ERROR; |
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61 got_cont_type = 0; |
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62 return; |
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63 } |
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64 strcpy(cont_type_buf + prev_len, line); |
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65 return; |
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66 case HDR_STATE_CONT_TE: |
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67 prev_len = strlen(cont_te_buf); |
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68 if (prev_len + strlen(line) + 1 > HDR_BUF_SIZE) { |
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69 error_ct_cont("Content-Transfer-Encoding"); |
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70 fputs(cont_te_buf, stdout); |
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71 fputs(line, stdout); |
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72 hdr_state = HDR_STATE_ERROR; |
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73 got_cont_te = 0; |
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74 return; |
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75 } |
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76 strcpy(cont_te_buf + prev_len, line); |
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77 return; |
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78 default: |
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79 fprintf(stderr, |
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80 "f-demime internal error: bad state in cont_line()\n"); |
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81 abort(); |
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82 } |
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83 } |
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84 |
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85 void |
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86 header_input_line(line, unterm, prev_unterm) |
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87 char *line; |
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88 { |
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89 char *cp, savech; |
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90 enum msg_hdr_state newhdr; |
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91 |
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92 if (!prev_unterm && line[0] == '\n') { |
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93 process_header_end(); |
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94 return; |
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95 } |
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96 if (hdr_state == HDR_STATE_ERROR) { |
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97 fputs(line, stdout); |
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98 return; |
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99 } |
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100 if (prev_unterm || line[0] == ' ' || line[0] == '\t') { |
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101 cont_line(line); |
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102 return; |
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103 } |
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104 cp = index(line, ':'); |
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105 if (!cp) { |
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106 error(line, "header line has no colon"); |
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107 return; |
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108 } |
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109 if (cp == line) { |
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110 error(line, "null header field name"); |
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111 return; |
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112 } |
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113 while (cp[-1] == ' ' || cp[-1] == '\t') |
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114 cp--; |
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115 savech = *cp; |
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116 *cp = '\0'; |
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117 if (!strcasecmp(line, "Content-Type")) |
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118 newhdr = HDR_STATE_CONT_TYPE; |
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119 else if (!strcasecmp(line, "Content-Transfer-Encoding")) |
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120 newhdr = HDR_STATE_CONT_TE; |
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121 else |
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122 newhdr = HDR_STATE_GOTSOME; |
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123 *cp = savech; |
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124 switch (newhdr) { |
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125 case HDR_STATE_CONT_TYPE: |
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126 if (got_cont_type) { |
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127 error(line, "duplicate Content-Type"); |
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128 return; |
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129 } |
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130 strcpy(cont_type_buf, line); |
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131 got_cont_type = 1; |
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132 break; |
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133 case HDR_STATE_CONT_TE: |
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134 if (got_cont_te) { |
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135 error(line, "duplicate Content-Transfer-Encoding"); |
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136 return; |
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137 } |
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138 strcpy(cont_te_buf, line); |
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139 got_cont_te = 1; |
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140 break; |
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141 default: |
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142 fputs(line, stdout); |
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143 } |
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144 hdr_state = newhdr; |
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145 } |