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<div class="title">mraheader.c</div> </div>
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<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span> <span class="comment">/*******************************************************************************</span></div><div class="line"><a name="l00002"></a><span class="lineno"> 2</span> <span class="comment"> *</span></div><div class="line"><a name="l00003"></a><span class="lineno"> 3</span> <span class="comment"> * Delta Chat Core</span></div><div class="line"><a name="l00004"></a><span class="lineno"> 4</span> <span class="comment"> * Copyright (C) 2017 Björn Petersen</span></div><div class="line"><a name="l00005"></a><span class="lineno"> 5</span> <span class="comment"> * Contact: r10s@b44t.com, http://b44t.com</span></div><div class="line"><a name="l00006"></a><span class="lineno"> 6</span> <span class="comment"> *</span></div><div class="line"><a name="l00007"></a><span class="lineno"> 7</span> <span class="comment"> * This program is free software: you can redistribute it and/or modify it under</span></div><div class="line"><a name="l00008"></a><span class="lineno"> 8</span> <span class="comment"> * the terms of the GNU General Public License as published by the Free Software</span></div><div class="line"><a name="l00009"></a><span class="lineno"> 9</span> <span class="comment"> * Foundation, either version 3 of the License, or (at your option) any later</span></div><div class="line"><a name="l00010"></a><span class="lineno"> 10</span> <span class="comment"> * version.</span></div><div class="line"><a name="l00011"></a><span class="lineno"> 11</span> <span class="comment"> *</span></div><div class="line"><a name="l00012"></a><span class="lineno"> 12</span> <span class="comment"> * This program is distributed in the hope that it will be useful, but WITHOUT</span></div><div class="line"><a name="l00013"></a><span class="lineno"> 13</span> <span class="comment"> * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS</span></div><div class="line"><a name="l00014"></a><span class="lineno"> 14</span> <span class="comment"> * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more</span></div><div class="line"><a name="l00015"></a><span class="lineno"> 15</span> <span class="comment"> * details.</span></div><div class="line"><a name="l00016"></a><span class="lineno"> 16</span> <span class="comment"> *</span></div><div class="line"><a name="l00017"></a><span class="lineno"> 17</span> <span class="comment"> * You should have received a copy of the GNU General Public License along with</span></div><div class="line"><a name="l00018"></a><span class="lineno"> 18</span> <span class="comment"> * this program. If not, see http://www.gnu.org/licenses/ .</span></div><div class="line"><a name="l00019"></a><span class="lineno"> 19</span> <span class="comment"> *</span></div><div class="line"><a name="l00020"></a><span class="lineno"> 20</span> <span class="comment"> ******************************************************************************/</span></div><div class="line"><a name="l00021"></a><span class="lineno"> 21</span> </div><div class="line"><a name="l00022"></a><span class="lineno"> 22</span> </div><div class="line"><a name="l00023"></a><span class="lineno"> 23</span> <span class="preprocessor">#include <ctype.h></span></div><div class="line"><a name="l00024"></a><span class="lineno"> 24</span> <span class="preprocessor">#include "mrmailbox_internal.h"</span></div><div class="line"><a name="l00025"></a><span class="lineno"> 25</span> <span class="preprocessor">#include "mraheader.h"</span></div><div class="line"><a name="l00026"></a><span class="lineno"> 26</span> <span class="preprocessor">#include "mrapeerstate.h"</span></div><div class="line"><a name="l00027"></a><span class="lineno"> 27</span> <span class="preprocessor">#include "mrmimeparser.h"</span></div><div class="line"><a name="l00028"></a><span class="lineno"> 28</span> </div><div class="line"><a name="l00029"></a><span class="lineno"> 29</span> </div><div class="line"><a name="l00033"></a><span class="lineno"> 33</span> <span class="keywordtype">void</span> mraheader_empty(mraheader_t* ths)</div><div class="line"><a name="l00034"></a><span class="lineno"> 34</span> {</div><div class="line"><a name="l00035"></a><span class="lineno"> 35</span>  <span class="keywordflow">if</span>( ths == NULL ) {</div><div class="line"><a name="l00036"></a><span class="lineno"> 36</span>  <span class="keywordflow">return</span>;</div><div class="line"><a name="l00037"></a><span class="lineno"> 37</span>  }</div><div class="line"><a name="l00038"></a><span class="lineno"> 38</span> </div><div class="line"><a name="l00039"></a><span class="lineno"> 39</span>  ths->m_prefer_encrypt = 0;</div><div class="line"><a name="l00040"></a><span class="lineno"> 40</span> </div><div class="line"><a name="l00041"></a><span class="lineno"> 41</span>  free(ths->m_addr);</div><div class="line"><a name="l00042"></a><span class="lineno"> 42</span>  ths->m_addr = NULL;</div><div class="line"><a name="l00043"></a><span class="lineno"> 43</span> </div><div class="line"><a name="l00044"></a><span class="lineno"> 44</span>  <span class="keywordflow">if</span>( ths->m_public_key->m_binary ) {</div><div class="line"><a name="l00045"></a><span class="lineno"> 45</span>  mrkey_unref(ths->m_public_key);</div><div class="line"><a name="l00046"></a><span class="lineno"> 46</span>  ths->m_public_key = mrkey_new();</div><div class="line"><a name="l00047"></a><span class="lineno"> 47</span>  }</div><div class="line"><a name="l00048"></a><span class="lineno"> 48</span> }</div><div class="line"><a name="l00049"></a><span class="lineno"> 49</span> </div><div class="line"><a name="l00050"></a><span class="lineno"> 50</span> </div><div class="line"><a name="l00051"></a><span class="lineno"> 51</span> <span class="comment">/*******************************************************************************</span></div><div class="line"><a name="l00052"></a><span class="lineno"> 52</span> <span class="comment"> * Render Autocrypt Header</span></div><div class="line"><a name="l00053"></a><span class="lineno"> 53</span> <span class="comment"> ******************************************************************************/</span></div><div class="line"><a name="l00054"></a><span class="lineno"> 54</span> </div><div class="line"><a name="l00055"></a><span class="lineno"> 55</span> </div><div class="line"><a name="l00059"></a><span class="lineno"> 59</span> <span class="keywordtype">char</span>* mraheader_render(<span class="keyword">const</span> mraheader_t* ths)</div><div class="line"><a name="l00060"></a><span class="lineno"> 60</span> {</div><div class="line"><a name="l00061"></a><span class="lineno"> 61</span>  <span class="keywordtype">int</span> success = 0;</div><div class="line"><a name="l00062"></a><span class="lineno"> 62</span>  <span class="keywordtype">char</span>* keybase64_wrapped = NULL;</div><div class="line"><a name="l00063"></a><span class="lineno"> 63</span>  mrstrbuilder_t ret;</div><div class="line"><a name="l00064"></a><span class="lineno"> 64</span>  mrstrbuilder_init(&ret);</div><div class="line"><a name="l00065"></a><span class="lineno"> 65</span> </div><div class="line"><a name="l00066"></a><span class="lineno"> 66</span>  <span class="keywordflow">if</span>( ths==NULL || ths->m_addr==NULL || ths->m_public_key->m_binary==NULL || ths->m_public_key->m_type!=MR_PUBLIC ) {</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <span class="keywordflow">goto</span> cleanup;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  }</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span> </div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  mrstrbuilder_cat(&ret, <span class="stringliteral">"addr="</span>);</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  mrstrbuilder_cat(&ret, ths->m_addr);</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  mrstrbuilder_cat(&ret, <span class="stringliteral">"; "</span>);</div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span> </div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">if</span>( ths->m_prefer_encrypt==MRA_PE_MUTUAL ) {</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  mrstrbuilder_cat(&ret, <span class="stringliteral">"prefer-encrypt=mutual; "</span>);</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  }</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span> </div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  mrstrbuilder_cat(&ret, <span class="stringliteral">"keydata= "</span>); <span class="comment">/* the trailing space together with mr_insert_breaks() allows a proper transport */</span></div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span> </div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  <span class="comment">/* adds a whitespace every 78 characters, this allows libEtPan to wrap the lines according to RFC 5322</span></div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span> <span class="comment"> (which may insert a linebreak before every whitespace) */</span></div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  <span class="keywordflow">if</span>( (keybase64_wrapped = mrkey_render_base64(ths->m_public_key, 78, <span class="stringliteral">" "</span>, 0<span class="comment">/*no checksum*/</span>)) == NULL ) {</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  <span class="keywordflow">goto</span> cleanup;</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  }</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span> </div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  mrstrbuilder_cat(&ret, keybase64_wrapped);</div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span> </div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  success = 1;</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span> </div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span> cleanup:</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  <span class="keywordflow">if</span>( !success ) { free(ret.m_buf); ret.m_buf = NULL; }</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  free(keybase64_wrapped);</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">return</span> ret.m_buf; <span class="comment">/* NULL on errors, this may happen for various reasons */</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span> }</div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span> </div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span> </div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span> <span class="comment">/*******************************************************************************</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span> <span class="comment"> * Parse Autocrypt Header</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span> <span class="comment"> ******************************************************************************/</span></div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span> </div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span> </div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span> <span class="keyword">static</span> <span class="keywordtype">int</span> add_attribute(mraheader_t* ths, <span class="keyword">const</span> <span class="keywordtype">char</span>* name, <span class="keyword">const</span> <span class="keywordtype">char</span>* value <span class="comment">/*may be NULL*/</span>)</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span> {</div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="comment">/* returns 0 if the attribute will result in an invalid header, 1 if the attribute is okay */</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  <span class="keywordflow">if</span>( strcasecmp(name, <span class="stringliteral">"addr"</span>)==0 )</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  {</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  <span class="keywordflow">if</span>( value == NULL</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  || strlen(value) < 3 || strchr(value, <span class="charliteral">'@'</span>)==NULL || strchr(value, <span class="charliteral">'.'</span>)==NULL <span class="comment">/* rough check if email-address is valid */</span></div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  || ths->m_addr <span class="comment">/* email already given */</span> ) {</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  }</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  ths->m_addr = mr_normalize_addr(value);</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span>  <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00114"></a><span class="lineno"> 114</span>  }</div><div class="line"><a name="l00115"></a><span class="lineno"> 115</span> <span class="preprocessor"> #if 0 </span><span class="comment">/* autoctypt 11/2017 no longer uses the type attribute and it will make the autocrypt header invalid */</span><span class="preprocessor"></span></div><div class="line"><a name="l00116"></a><span class="lineno"> 116</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span>( strcasecmp(name, <span class="stringliteral">"type"</span>)==0 )</div><div class="line"><a name="l00117"></a><span class="lineno"> 117</span>  {</div><div class="line"><a name="l00118"></a><span class="lineno"> 118</span>  <span class="keywordflow">if</span>( value == NULL ) {</div><div class="line"><a name="l00119"></a><span class="lineno"> 119</span>  <span class="keywordflow">return</span> 0; <span class="comment">/* attribute with no value results in an invalid header */</span></div><div class="line"><a name="l00120"></a><span class="lineno"> 120</span>  }</div><div class="line"><a name="l00121"></a><span class="lineno"> 121</span>  <span class="keywordflow">if</span>( strcasecmp(value, <span class="stringliteral">"1"</span>)==0 || strcasecmp(value, <span class="stringliteral">"0"</span> <span class="comment">/*deprecated*/</span>)==0 || strcasecmp(value, <span class="stringliteral">"p"</span> <span class="comment">/*deprecated*/</span>)==0 ) {</div><div class="line"><a name="l00122"></a><span class="lineno"> 122</span>  <span class="keywordflow">return</span> 1; <span class="comment">/* PGP-type */</span></div><div class="line"><a name="l00123"></a><span class="lineno"> 123</span>  }</div><div class="line"><a name="l00124"></a><span class="lineno"> 124</span>  <span class="keywordflow">return</span> 0; <span class="comment">/* unknown types result in an invalid header */</span></div><div class="line"><a name="l00125"></a><span class="lineno"> 125</span>  }</div><div class="line"><a name="l00126"></a><span class="lineno"> 126</span> <span class="preprocessor"> #endif</span></div><div class="line"><a name="l00127"></a><span class="lineno"> 127</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span>( strcasecmp(name, <span class="stringliteral">"prefer-encrypt"</span>)==0 )</div><div class="line"><a name="l00128"></a><span class="lineno"> 128</span>  {</div><div class="line"><a name="l00129"></a><span class="lineno"> 129</span>  <span class="keywordflow">if</span>( value && strcasecmp(value, <span class="stringliteral">"mutual"</span>)==0 ) {</div><div class="line"><a name="l00130"></a><span class="lineno"> 130</span>  ths->m_prefer_encrypt = MRA_PE_MUTUAL;</div><div class="line"><a name="l00131"></a><span class="lineno"> 131</span>  <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00132"></a><span class="lineno"> 132</span>  }</div><div class="line"><a name="l00133"></a><span class="lineno"> 133</span>  <span class="keywordflow">return</span> 1; <span class="comment">/* An Autocrypt level 0 client that sees the attribute with any other value (or that does not see the attribute at all) should interpret the value as nopreference.*/</span></div><div class="line"><a name="l00134"></a><span class="lineno"> 134</span>  }</div><div class="line"><a name="l00135"></a><span class="lineno"> 135</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span>( strcasecmp(name, <span class="stringliteral">"keydata"</span>)==0 )</div><div class="line"><a name="l00136"></a><span class="lineno"> 136</span>  {</div><div class="line"><a name="l00137"></a><span class="lineno"> 137</span>  <span class="keywordflow">if</span>( value == NULL</div><div class="line"><a name="l00138"></a><span class="lineno"> 138</span>  || ths->m_public_key->m_binary || ths->m_public_key->m_bytes ) {</div><div class="line"><a name="l00139"></a><span class="lineno"> 139</span>  <span class="keywordflow">return</span> 0; <span class="comment">/* there is already a k*/</span></div><div class="line"><a name="l00140"></a><span class="lineno"> 140</span>  }</div><div class="line"><a name="l00141"></a><span class="lineno"> 141</span>  <span class="keywordflow">return</span> mrkey_set_from_base64(ths->m_public_key, value, MR_PUBLIC);</div><div class="line"><a name="l00142"></a><span class="lineno"> 142</span>  }</div><div class="line"><a name="l00143"></a><span class="lineno"> 143</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span>( name[0]==<span class="charliteral">'_'</span> )</div><div class="line"><a name="l00144"></a><span class="lineno"> 144</span>  {</div><div class="line"><a name="l00145"></a><span class="lineno"> 145</span>  <span class="comment">/* Autocrypt-Level0: unknown attributes starting with an underscore can be safely ignored */</span></div><div class="line"><a name="l00146"></a><span class="lineno"> 146</span>  <span class="keywordflow">return</span> 1;</div><div class="line"><a name="l00147"></a><span class="lineno"> 147</span>  }</div><div class="line"><a name="l00148"></a><span class="lineno"> 148</span> </div><div class="line"><a name="l00149"></a><span class="lineno"> 149</span>  <span class="comment">/* Autocrypt-Level0: unknown attribute, treat the header as invalid */</span></div><div class="line"><a name="l00150"></a><span class="lineno"> 150</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00151"></a><span class="lineno"> 151</span> }</div><div class="line"><a name="l00152"></a><span class="lineno"> 152</span> </div><div class="line"><a name="l00153"></a><span class="lineno"> 153</span> </div><div class="line"><a name="l00157"></a><span class="lineno"> 157</span> <span class="keywordtype">int</span> mraheader_set_from_string(mraheader_t* ths, <span class="keyword">const</span> <span class="keywordtype">char</span>* header_str__)</div><div class="line"><a name="l00158"></a><span class="lineno"> 158</span> {</div><div class="line"><a name="l00159"></a><span class="lineno"> 159</span>  <span class="comment">/* according to RFC 5322 (Internet Message Format), the given string may contain `\r\n` before any whitespace.</span></div><div class="line"><a name="l00160"></a><span class="lineno"> 160</span> <span class="comment"> we can ignore this issue as</span></div><div class="line"><a name="l00161"></a><span class="lineno"> 161</span> <span class="comment"> (a) no key or value is expected to contain spaces,</span></div><div class="line"><a name="l00162"></a><span class="lineno"> 162</span> <span class="comment"> (b) for the key, non-base64-characters are ignored and</span></div><div class="line"><a name="l00163"></a><span class="lineno"> 163</span> <span class="comment"> (c) for parsing, we ignore `\r\n` as well as tabs for spaces */</span></div><div class="line"><a name="l00164"></a><span class="lineno"> 164</span> <span class="preprocessor"> #define AHEADER_WS "\t\r\n "</span></div><div class="line"><a name="l00165"></a><span class="lineno"> 165</span>  <span class="keywordtype">char</span> *header_str = NULL;</div><div class="line"><a name="l00166"></a><span class="lineno"> 166</span>  <span class="keywordtype">char</span> *p, *beg_attr_name, *after_attr_name, *beg_attr_value;</div><div class="line"><a name="l00167"></a><span class="lineno"> 167</span>  <span class="keywordtype">int</span> success = 0;</div><div class="line"><a name="l00168"></a><span class="lineno"> 168</span> </div><div class="line"><a name="l00169"></a><span class="lineno"> 169</span>  mraheader_empty(ths);</div><div class="line"><a name="l00170"></a><span class="lineno"> 170</span>  ths->m_prefer_encrypt = MRA_PE_NOPREFERENCE; <span class="comment">/* value to use if the prefer-encrypted header is missing */</span></div><div class="line"><a name="l00171"></a><span class="lineno"> 171</span> </div><div class="line"><a name="l00172"></a><span class="lineno"> 172</span>  <span class="keywordflow">if</span>( ths == NULL || header_str__ == NULL ) {</div><div class="line"><a name="l00173"></a><span class="lineno"> 173</span>  <span class="keywordflow">goto</span> cleanup;</div><div class="line"><a name="l00174"></a><span class="lineno"> 174</span>  }</div><div class="line"><a name="l00175"></a><span class="lineno"> 175</span> </div><div class="line"><a name="l00176"></a><span class="lineno"> 176</span>  header_str = safe_strdup(header_str__);</div><div class="line"><a name="l00177"></a><span class="lineno"> 177</span>  p = header_str;</div><div class="line"><a name="l00178"></a><span class="lineno"> 178</span>  <span class="keywordflow">while</span>( *p )</div><div class="line"><a name="l00179"></a><span class="lineno"> 179</span>  {</div><div class="line"><a name="l00180"></a><span class="lineno"> 180</span>  p += strspn(p, AHEADER_WS <span class="stringliteral">"=;"</span>); <span class="comment">/* forward to first attribute name beginning */</span></div><div class="line"><a name="l00181"></a><span class="lineno"> 181</span>  beg_attr_name = p;</div><div class="line"><a name="l00182"></a><span class="lineno"> 182</span>  beg_attr_value = NULL;</div><div class="line"><a name="l00183"></a><span class="lineno"> 183</span>  p += strcspn(p, AHEADER_WS <span class="stringliteral">"=;"</span>); <span class="comment">/* get end of attribute name (an attribute may have no value) */</span></div><div class="line"><a name="l00184"></a><span class="lineno"> 184</span>  <span class="keywordflow">if</span>( p != beg_attr_name )</div><div class="line"><a name="l00185"></a><span class="lineno"> 185</span>  {</div><div class="line"><a name="l00186"></a><span class="lineno"> 186</span>  <span class="comment">/* attribute found */</span></div><div class="line"><a name="l00187"></a><span class="lineno"> 187</span>  after_attr_name = p;</div><div class="line"><a name="l00188"></a><span class="lineno"> 188</span>  p += strspn(p, AHEADER_WS); <span class="comment">/* skip whitespace between attribute name and possible `=` */</span></div><div class="line"><a name="l00189"></a><span class="lineno"> 189</span>  <span class="keywordflow">if</span>( *p == <span class="charliteral">'='</span> )</div><div class="line"><a name="l00190"></a><span class="lineno"> 190</span>  {</div><div class="line"><a name="l00191"></a><span class="lineno"> 191</span>  p += strspn(p, AHEADER_WS <span class="stringliteral">"="</span>); <span class="comment">/* skip spaces and equal signs */</span></div><div class="line"><a name="l00192"></a><span class="lineno"> 192</span> </div><div class="line"><a name="l00193"></a><span class="lineno"> 193</span>  <span class="comment">/* read unquoted attribute value until the first semicolon */</span></div><div class="line"><a name="l00194"></a><span class="lineno"> 194</span>  beg_attr_value = p;</div><div class="line"><a name="l00195"></a><span class="lineno"> 195</span>  p += strcspn(p, <span class="stringliteral">";"</span>);</div><div class="line"><a name="l00196"></a><span class="lineno"> 196</span>  <span class="keywordflow">if</span>( *p != <span class="charliteral">'\0'</span> ) {</div><div class="line"><a name="l00197"></a><span class="lineno"> 197</span>  *p = <span class="charliteral">'\0'</span>;</div><div class="line"><a name="l00198"></a><span class="lineno"> 198</span>  p++;</div><div class="line"><a name="l00199"></a><span class="lineno"> 199</span>  }</div><div class="line"><a name="l00200"></a><span class="lineno"> 200</span>  mr_trim(beg_attr_value);</div><div class="line"><a name="l00201"></a><span class="lineno"> 201</span>  }</div><div class="line"><a name="l00202"></a><span class="lineno"> 202</span>  <span class="keywordflow">else</span></div><div class="line"><a name="l00203"></a><span class="lineno"> 203</span>  {</div><div class="line"><a name="l00204"></a><span class="lineno"> 204</span>  p += strspn(p, AHEADER_WS <span class="stringliteral">";"</span>);</div><div class="line"><a name="l00205"></a><span class="lineno"> 205</span>  }</div><div class="line"><a name="l00206"></a><span class="lineno"> 206</span>  *after_attr_name = <span class="charliteral">'\0'</span>;</div><div class="line"><a name="l00207"></a><span class="lineno"> 207</span>  <span class="keywordflow">if</span>( !add_attribute(ths, beg_attr_name, beg_attr_value) ) {</div><div class="line"><a name="l00208"></a><span class="lineno"> 208</span>  <span class="keywordflow">goto</span> cleanup; <span class="comment">/* a bad attribute makes the whole header invalid */</span></div><div class="line"><a name="l00209"></a><span class="lineno"> 209</span>  }</div><div class="line"><a name="l00210"></a><span class="lineno"> 210</span>  }</div><div class="line"><a name="l00211"></a><span class="lineno"> 211</span>  }</div><div class="line"><a name="l00212"></a><span class="lineno"> 212</span> </div><div class="line"><a name="l00213"></a><span class="lineno"> 213</span>  <span class="comment">/* all needed data found? */</span></div><div class="line"><a name="l00214"></a><span class="lineno"> 214</span>  <span class="keywordflow">if</span>( ths->m_addr && ths->m_public_key->m_binary ) {</div><div class="line"><a name="l00215"></a><span class="lineno"> 215</span>  success = 1;</div><div class="line"><a name="l00216"></a><span class="lineno"> 216</span>  }</div><div class="line"><a name="l00217"></a><span class="lineno"> 217</span> </div><div class="line"><a name="l00218"></a><span class="lineno"> 218</span> cleanup:</div><div class="line"><a name="l00219"></a><span class="lineno"> 219</span>  free(header_str);</div><div class="line"><a name="l00220"></a><span class="lineno"> 220</span>  <span class="keywordflow">if</span>( !success ) { mraheader_empty(ths); }</div><div class="line"><a name="l00221"></a><span class="lineno"> 221</span>  <span class="keywordflow">return</span> success;</div><div class="line"><a name="l00222"></a><span class="lineno"> 222</span> }</div><div class="line"><a name="l00223"></a><span class="lineno"> 223</span> </div><div class="line"><a name="l00224"></a><span class="lineno"> 224</span> </div><div class="line"><a name="l00225"></a><span class="lineno"> 225</span> <span class="comment">/*******************************************************************************</span></div><div class="line"><a name="l00226"></a><span class="lineno"> 226</span> <span class="comment"> * Main interface</span></div><div class="line"><a name="l00227"></a><span class="lineno"> 227</span> <span class="comment"> ******************************************************************************/</span></div><div class="line"><a name="l00228"></a><span class="lineno"> 228</span> </div><div class="line"><a name="l00229"></a><span class="lineno"> 229</span> </div><div class="line"><a name="l00233"></a><span class="lineno"> 233</span> mraheader_t* mraheader_new()</div><div class="line"><a name="l00234"></a><span class="lineno"> 234</span> {</div><div class="line"><a name="l00235"></a><span class="lineno"> 235</span>  mraheader_t* ths = NULL;</div><div class="line"><a name="l00236"></a><span class="lineno"> 236</span> </div><div class="line"><a name="l00237"></a><span class="lineno"> 237</span>  <span class="keywordflow">if</span>( (ths=calloc(1, <span class="keyword">sizeof</span>(mraheader_t)))==NULL ) {</div><div class="line"><a name="l00238"></a><span class="lineno"> 238</span>  exit(37); <span class="comment">/* cannot allocate little memory, unrecoverable error */</span></div><div class="line"><a name="l00239"></a><span class="lineno"> 239</span>  }</div><div class="line"><a name="l00240"></a><span class="lineno"> 240</span> </div><div class="line"><a name="l00241"></a><span class="lineno"> 241</span>  ths->m_public_key = mrkey_new();</div><div class="line"><a name="l00242"></a><span class="lineno"> 242</span> </div><div class="line"><a name="l00243"></a><span class="lineno"> 243</span>  <span class="keywordflow">return</span> ths;</div><div class="line"><a name="l00244"></a><span class="lineno"> 244</span> }</div><div class="line"><a name="l00245"></a><span class="lineno"> 245</span> </div><div class="line"><a name="l00246"></a><span class="lineno"> 246</span> </div><div class="line"><a name="l00250"></a><span class="lineno"> 250</span> <span class="keywordtype">void</span> mraheader_unref(mraheader_t* ths)</div><div class="line"><a name="l00251"></a><span class="lineno"> 251</span> {</div><div class="line"><a name="l00252"></a><span class="lineno"> 252</span>  <span class="keywordflow">if</span>( ths==NULL ) {</div><div class="line"><a name="l00253"></a><span class="lineno"> 253</span>  <span class="keywordflow">return</span>;</div><div class="line"><a name="l00254"></a><span class="lineno"> 254</span>  }</div><div class="line"><a name="l00255"></a><span class="lineno"> 255</span> </div><div class="line"><a name="l00256"></a><span class="lineno"> 256</span>  free(ths->m_addr);</div><div class="line"><a name="l00257"></a><span class="lineno"> 257</span>  mrkey_unref(ths->m_public_key);</div><div class="line"><a name="l00258"></a><span class="lineno"> 258</span>  free(ths);</div><div class="line"><a name="l00259"></a><span class="lineno"> 259</span> }</div><div class="line"><a name="l00260"></a><span class="lineno"> 260</span> </div><div class="line"><a name="l00261"></a><span class="lineno"> 261</span> </div><div class="line"><a name="l00265"></a><span class="lineno"> 265</span> mraheader_t* mraheader_new_from_imffields(<span class="keyword">const</span> <span class="keywordtype">char</span>* wanted_from, <span class="keyword">const</span> <span class="keyword">struct</span> mailimf_fields* header)</div><div class="line"><a name="l00266"></a><span class="lineno"> 266</span> {</div><div class="line"><a name="l00267"></a><span class="lineno"> 267</span>  clistiter* cur;</div><div class="line"><a name="l00268"></a><span class="lineno"> 268</span>  mraheader_t* fine_header = NULL;</div><div class="line"><a name="l00269"></a><span class="lineno"> 269</span> </div><div class="line"><a name="l00270"></a><span class="lineno"> 270</span>  <span class="keywordflow">if</span>( wanted_from == NULL || header == NULL ) {</div><div class="line"><a name="l00271"></a><span class="lineno"> 271</span>  <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00272"></a><span class="lineno"> 272</span>  }</div><div class="line"><a name="l00273"></a><span class="lineno"> 273</span> </div><div class="line"><a name="l00274"></a><span class="lineno"> 274</span>  <span class="keywordflow">for</span>( cur = clist_begin(header->fld_list); cur!=NULL ; cur=clist_next(cur) )</div><div class="line"><a name="l00275"></a><span class="lineno"> 275</span>  {</div><div class="line"><a name="l00276"></a><span class="lineno"> 276</span>  <span class="keyword">struct </span>mailimf_field* field = (<span class="keyword">struct </span>mailimf_field*)clist_content(cur);</div><div class="line"><a name="l00277"></a><span class="lineno"> 277</span>  <span class="keywordflow">if</span>( field && field->fld_type == MAILIMF_FIELD_OPTIONAL_FIELD )</div><div class="line"><a name="l00278"></a><span class="lineno"> 278</span>  {</div><div class="line"><a name="l00279"></a><span class="lineno"> 279</span>  <span class="keyword">struct </span>mailimf_optional_field* optional_field = field->fld_data.fld_optional_field;</div><div class="line"><a name="l00280"></a><span class="lineno"> 280</span>  <span class="keywordflow">if</span>( optional_field && optional_field->fld_name && strcasecmp(optional_field->fld_name, <span class="stringliteral">"Autocrypt"</span>)==0 )</div><div class="line"><a name="l00281"></a><span class="lineno"> 281</span>  {</div><div class="line"><a name="l00282"></a><span class="lineno"> 282</span>  <span class="comment">/* header found, check if it is valid and matched the wanted address */</span></div><div class="line"><a name="l00283"></a><span class="lineno"> 283</span>  mraheader_t* test = mraheader_new();</div><div class="line"><a name="l00284"></a><span class="lineno"> 284</span>  <span class="keywordflow">if</span>( !mraheader_set_from_string(test, optional_field->fld_value)</div><div class="line"><a name="l00285"></a><span class="lineno"> 285</span>  || strcasecmp(test->m_addr, wanted_from)!=0 ) {</div><div class="line"><a name="l00286"></a><span class="lineno"> 286</span>  mraheader_unref(test);</div><div class="line"><a name="l00287"></a><span class="lineno"> 287</span>  test = NULL;</div><div class="line"><a name="l00288"></a><span class="lineno"> 288</span>  }</div><div class="line"><a name="l00289"></a><span class="lineno"> 289</span> </div><div class="line"><a name="l00290"></a><span class="lineno"> 290</span>  <span class="keywordflow">if</span>( fine_header == NULL ) {</div><div class="line"><a name="l00291"></a><span class="lineno"> 291</span>  fine_header = test; <span class="comment">/* may still be NULL */</span></div><div class="line"><a name="l00292"></a><span class="lineno"> 292</span>  }</div><div class="line"><a name="l00293"></a><span class="lineno"> 293</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span>( test ) {</div><div class="line"><a name="l00294"></a><span class="lineno"> 294</span>  mraheader_unref(fine_header);</div><div class="line"><a name="l00295"></a><span class="lineno"> 295</span>  mraheader_unref(test);</div><div class="line"><a name="l00296"></a><span class="lineno"> 296</span>  <span class="keywordflow">return</span> NULL; <span class="comment">/* more than one valid header for the same address results in an error, see Autocrypt Level 1 */</span></div><div class="line"><a name="l00297"></a><span class="lineno"> 297</span>  }</div><div class="line"><a name="l00298"></a><span class="lineno"> 298</span>  }</div><div class="line"><a name="l00299"></a><span class="lineno"> 299</span>  }</div><div class="line"><a name="l00300"></a><span class="lineno"> 300</span>  }</div><div class="line"><a name="l00301"></a><span class="lineno"> 301</span> </div><div class="line"><a name="l00302"></a><span class="lineno"> 302</span>  <span class="keywordflow">return</span> fine_header; <span class="comment">/* may be NULL */</span></div><div class="line"><a name="l00303"></a><span class="lineno"> 303</span> }</div><div class="line"><a name="l00304"></a><span class="lineno"> 304</span> </div></div><!-- fragment --></div><!-- contents -->
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