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Overview
Comment: | Work toward an email format decoder. This is an incremental check-in. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA3-256: |
11c82d816969039bb371e0a44c03ffe8 |
User & Date: | drh 2018-07-12 20:36:07.481 |
Context
2018-07-12
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22:16 | Another incremental check-in on the email format decoder. ... (check-in: ec3fccd3 user: drh tags: trunk) | |
20:36 | Work toward an email format decoder. This is an incremental check-in. ... (check-in: 11c82d81 user: drh tags: trunk) | |
17:08 | Fix typo in makemake.tcl. ... (check-in: e817f1b0 user: tsbg tags: trunk) | |
Changes
Changes to src/webmail.c.
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22 23 24 25 26 27 28 29 30 31 32 33 34 35 | ** emailblob ** emailroute */ #include "config.h" #include "webmail.h" #include <assert.h> /* ** WEBPAGE: webmail ** ** This page can be used to read content from the EMAILBOX table ** that contains email received by the "fossil smtpd" command. */ void webmail_page(void){ | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 | ** emailblob ** emailroute */ #include "config.h" #include "webmail.h" #include <assert.h> #if INTERFACE /* Recognized content encodings */ #define EMAILENC_NONE 0 /* No encoding */ #define EMAILENC_B64 1 /* Base64 encoded */ #define EMAILENC_QUOTED 2 /* Quoted printable */ /* An instance of the following object records the location of important ** attributes on a single element in a multipart email message body. */ struct EmailBody { char zMimetype[32]; /* Mimetype */ u8 encoding; /* Type of encoding */ char *zFilename; /* From content-disposition: */ Blob content; /* Encoded content for this segment */ }; /* ** An instance of the following object describes the struture of ** an rfc-2822 email message. */ struct EmailToc { int nHdr; /* Number of header lines */ int nHdrAlloc; /* Number of header lines allocated */ int *aHdr; /* Two integers for each hdr line, offset and length */ int nBody; /* Number of body segments */ int nBodyAlloc; /* Number of body segments allocated */ EmailBody *aBody; /* Location of body information */ }; #endif /* ** Free An EmailToc object */ void emailtoc_free(EmailToc *p){ int i; fossil_free(p->aHdr); for(i=0; i<p->nBody; i++){ fossil_free(p->aBody[i].zFilename); blob_reset(&p->aBody[i].content); } fossil_free(p->aBody); fossil_free(p); } /* ** Allocate a new EmailToc object */ EmailToc *emailtoc_alloc(void){ EmailToc *p = fossil_malloc( sizeof(*p) ); memset(p, 0, sizeof(*p)); return p; } /* ** Add a new body element to an EmailToc. */ EmailBody *emailtoc_new_body(EmailToc *p){ EmailBody *pNew; p->nBody++; if( p->nBody>p->nBodyAlloc ){ p->nBodyAlloc = (p->nBodyAlloc+1)*2; p->aBody = fossil_realloc(p->aBody, sizeof(p->aBody[0])*p->nBodyAlloc); } pNew = &p->aBody[p->nBody-1]; memset(pNew, 0, sizeof(*pNew)); pNew->content = empty_blob; return pNew; } /* ** Add a new header line to the EmailToc. */ void emailtoc_new_header_line(EmailToc *p, int iOfst, int nAmt){ p->nHdr++; if( p->nHdr>p->nHdrAlloc ){ p->nHdrAlloc = (p->nHdrAlloc+1)*2; p->aHdr = fossil_realloc(p->aHdr, sizeof(int)*2*p->nHdrAlloc); } p->aHdr[p->nHdr*2-2] = iOfst; p->aHdr[p->nHdr*2-1] = nAmt; } /* ** Return the length of a line in an email header. Continuation lines ** are included. Hence, this routine returns the number of bytes up to ** and including the first \n character that is followed by something ** other than whitespace. */ static int email_line_length(const char *z){ int i; for(i=0; z[i] && (z[i]!='\n' || z[i+1]==' ' || z[i+1]=='\t'); i++){} if( z[i]=='\n' ) i++; return i; } /* ** Return a pointer to the first non-whitespace character in z */ static const char *firstToken(const char *z, int n){ while( n>0 && fossil_isspace(*z) ){ n--; z++; } return n>0 ? z : 0; } /* ** The n-bytes of content in z are a multipart/ body component for ** an email message. Decode this into its individual segments. ** ** The component should start and end with a boundary line. There ** may be additional boundary lines in the middle. */ static void emailtoc_add_multipart( EmailToc *p, /* Append the segments here */ Blob *pEmail, /* The original full email raw text */ const char *z, /* The body component */ int n /* Bytes of content in z[] */ ){ return; } /* ** Compute a table-of-contents (EmailToc) for the email message ** provided on the input. */ EmailToc *emailtoc_from_email(Blob *pEmail){ const char *z; int i; int n; int multipartBody = 0; EmailToc *p = emailtoc_alloc(); EmailBody *pBody = emailtoc_new_body(p); blob_terminate(pEmail); z = blob_buffer(pEmail); i = 0; while( z[i] ){ n = email_line_length(&z[i]); if( (n==2 && z[i]=='\r' && z[i+1]=='\n') || z[i]=='\n' || n==0 ){ /* This is the blank line at the end of the header */ i += n; break; } if( sqlite3_strnicmp(z+i, "Content-Type:", 13)==0 ){ const char *z2 = firstToken(z+i+13, n-13); if( z2 && strncmp(z2, "multipart/", 10)==0 ){ multipartBody = 1; }else{ int j; for(j=0; z2[j]=='/' || fossil_isalnum(z2[j]); j++){} if( j>=sizeof(pBody->zMimetype) ) j = sizeof(pBody->zMimetype); memcpy(pBody->zMimetype, z2, j); pBody->zMimetype[j] = 0; } } /* 123456789 123456789 123456 */ if( sqlite3_strnicmp(z+i, "Content-Transfer-Encoding:", 26)==0 ){ const char *z2 = firstToken(z+(i+26), n-26); if( z2 && sqlite3_strnicmp(z2, "base64", 6)==0 ){ pBody->encoding = EMAILENC_B64; /* 123456789 123456 */ }else if( sqlite3_strnicmp(z2, "quoted-printable", 16)==0 ){ pBody->encoding = EMAILENC_QUOTED; }else{ pBody->encoding = EMAILENC_NONE; } } emailtoc_new_header_line(p, i, n); i += n; } n = blob_size(pEmail) - i; if( multipartBody ){ p->nBody--; emailtoc_add_multipart(p, pEmail, z+i, n); }else{ blob_init(&pBody->content, z+i, n); } return p; } /* ** COMMAND: test-decode-email ** ** Usage: %fossil test-decode-email FILE ** ** Read an rfc-2822 formatted email out of FILE, then write a decoding ** to stdout. Use for testing and validating the email decoder. */ void test_email_decode_cmd(void){ Blob email; EmailToc *p; int i; const char *z; verify_all_options(); if( g.argc!=3 ) usage("FILE"); blob_read_from_file(&email, g.argv[2], ExtFILE); p = emailtoc_from_email(&email); z = blob_buffer(&email); fossil_print("%d header line and %d content segments\n", p->nHdr, p->nBody); for(i=0; i<p->nHdr; i++){ fossil_print("%3d: %.*s", i, p->aHdr[i*2+1], z+p->aHdr[i*2]); } for(i=0; i<p->nBody; i++){ fossil_print("\nBODY %d mime \"%s\" encoding %d:\n", i, p->aBody[i].zMimetype, p->aBody[i].encoding); fossil_print("%s\n", blob_str(&p->aBody[i].content)); } emailtoc_free(p); blob_reset(&email); } /* ** WEBPAGE: webmail ** ** This page can be used to read content from the EMAILBOX table ** that contains email received by the "fossil smtpd" command. */ void webmail_page(void){ |
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