1#ifndef HEADER_CURL_MIME_H
2#define HEADER_CURL_MIME_H
3/***************************************************************************
4 * _ _ ____ _
5 * Project ___| | | | _ \| |
6 * / __| | | | |_) | |
7 * | (__| |_| | _ <| |___
8 * \___|\___/|_| \_\_____|
9 *
10 * Copyright (C) 1998 - 2022, Daniel Stenberg, <[email protected]>, et al.
11 *
12 * This software is licensed as described in the file COPYING, which
13 * you should have received as part of this distribution. The terms
14 * are also available at https://curl.se/docs/copyright.html.
15 *
16 * You may opt to use, copy, modify, merge, publish, distribute and/or sell
17 * copies of the Software, and permit persons to whom the Software is
18 * furnished to do so, under the terms of the COPYING file.
19 *
20 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
21 * KIND, either express or implied.
22 *
23 * SPDX-License-Identifier: curl
24 *
25 ***************************************************************************/
26
27#include "curl_setup.h"
28
29#define MIME_BOUNDARY_DASHES 24 /* leading boundary dashes */
30#define MIME_RAND_BOUNDARY_CHARS 16 /* Nb. of random boundary chars. */
31#define MAX_ENCODED_LINE_LENGTH 76 /* Maximum encoded line length. */
32#define ENCODING_BUFFER_SIZE 256 /* Encoding temp buffers size. */
33
34/* Part flags. */
35#define MIME_USERHEADERS_OWNER (1 << 0)
36#define MIME_BODY_ONLY (1 << 1)
37#define MIME_FAST_READ (1 << 2)
38
39#define FILE_CONTENTTYPE_DEFAULT "application/octet-stream"
40#define MULTIPART_CONTENTTYPE_DEFAULT "multipart/mixed"
41#define DISPOSITION_DEFAULT "attachment"
42
43/* Part source kinds. */
44enum mimekind {
45 MIMEKIND_NONE = 0, /* Part not set. */
46 MIMEKIND_DATA, /* Allocated mime data. */
47 MIMEKIND_FILE, /* Data from file. */
48 MIMEKIND_CALLBACK, /* Data from `read' callback. */
49 MIMEKIND_MULTIPART, /* Data is a mime subpart. */
50 MIMEKIND_LAST
51};
52
53/* Readback state tokens. */
54enum mimestate {
55 MIMESTATE_BEGIN, /* Readback has not yet started. */
56 MIMESTATE_CURLHEADERS, /* In curl-generated headers. */
57 MIMESTATE_USERHEADERS, /* In caller's supplied headers. */
58 MIMESTATE_EOH, /* End of headers. */
59 MIMESTATE_BODY, /* Placeholder. */
60 MIMESTATE_BOUNDARY1, /* In boundary prefix. */
61 MIMESTATE_BOUNDARY2, /* In boundary. */
62 MIMESTATE_CONTENT, /* In content. */
63 MIMESTATE_END, /* End of part reached. */
64 MIMESTATE_LAST
65};
66
67/* Mime headers strategies. */
68enum mimestrategy {
69 MIMESTRATEGY_MAIL, /* Mime mail. */
70 MIMESTRATEGY_FORM, /* HTTP post form. */
71 MIMESTRATEGY_LAST
72};
73
74/* Content transfer encoder. */
75struct mime_encoder {
76 const char * name; /* Encoding name. */
77 size_t (*encodefunc)(char *buffer, size_t size, bool ateof,
78 curl_mimepart *part); /* Encoded read. */
79 curl_off_t (*sizefunc)(curl_mimepart *part); /* Encoded size. */
80};
81
82/* Content transfer encoder state. */
83struct mime_encoder_state {
84 size_t pos; /* Position on output line. */
85 size_t bufbeg; /* Next data index in input buffer. */
86 size_t bufend; /* First unused byte index in input buffer. */
87 char buf[ENCODING_BUFFER_SIZE]; /* Input buffer. */
88};
89
90/* Mime readback state. */
91struct mime_state {
92 enum mimestate state; /* Current state token. */
93 void *ptr; /* State-dependent pointer. */
94 curl_off_t offset; /* State-dependent offset. */
95};
96
97/* Boundary string length. */
98#define MIME_BOUNDARY_LEN (MIME_BOUNDARY_DASHES + MIME_RAND_BOUNDARY_CHARS)
99
100/* A mime multipart. */
101struct curl_mime {
102 struct Curl_easy *easy; /* The associated easy handle. */
103 curl_mimepart *parent; /* Parent part. */
104 curl_mimepart *firstpart; /* First part. */
105 curl_mimepart *lastpart; /* Last part. */
106 char boundary[MIME_BOUNDARY_LEN + 1]; /* The part boundary. */
107 struct mime_state state; /* Current readback state. */
108};
109
110/* A mime part. */
111struct curl_mimepart {
112 struct Curl_easy *easy; /* The associated easy handle. */
113 curl_mime *parent; /* Parent mime structure. */
114 curl_mimepart *nextpart; /* Forward linked list. */
115 enum mimekind kind; /* The part kind. */
116 unsigned int flags; /* Flags. */
117 char *data; /* Memory data or file name. */
118 curl_read_callback readfunc; /* Read function. */
119 curl_seek_callback seekfunc; /* Seek function. */
120 curl_free_callback freefunc; /* Argument free function. */
121 void *arg; /* Argument to callback functions. */
122 FILE *fp; /* File pointer. */
123 struct curl_slist *curlheaders; /* Part headers. */
124 struct curl_slist *userheaders; /* Part headers. */
125 char *mimetype; /* Part mime type. */
126 char *filename; /* Remote file name. */
127 char *name; /* Data name. */
128 curl_off_t datasize; /* Expected data size. */
129 struct mime_state state; /* Current readback state. */
130 const struct mime_encoder *encoder; /* Content data encoder. */
131 struct mime_encoder_state encstate; /* Data encoder state. */
132 size_t lastreadstatus; /* Last read callback returned status. */
133};
134
135CURLcode Curl_mime_add_header(struct curl_slist **slp, const char *fmt, ...);
136
137#if (!defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_MIME)) || \
138 !defined(CURL_DISABLE_SMTP) || !defined(CURL_DISABLE_IMAP)
139
140/* Prototypes. */
141void Curl_mime_initpart(struct curl_mimepart *part, struct Curl_easy *easy);
142void Curl_mime_cleanpart(struct curl_mimepart *part);
143CURLcode Curl_mime_duppart(struct curl_mimepart *dst,
144 const curl_mimepart *src);
145CURLcode Curl_mime_set_subparts(struct curl_mimepart *part,
146 struct curl_mime *subparts,
147 int take_ownership);
148CURLcode Curl_mime_prepare_headers(struct curl_mimepart *part,
149 const char *contenttype,
150 const char *disposition,
151 enum mimestrategy strategy);
152curl_off_t Curl_mime_size(struct curl_mimepart *part);
153size_t Curl_mime_read(char *buffer, size_t size, size_t nitems,
154 void *instream);
155CURLcode Curl_mime_rewind(struct curl_mimepart *part);
156const char *Curl_mime_contenttype(const char *filename);
157void Curl_mime_unpause(struct curl_mimepart *part);
158
159#else
160/* if disabled */
161#define Curl_mime_initpart(x,y)
162#define Curl_mime_cleanpart(x)
163#define Curl_mime_duppart(x,y) CURLE_OK /* Nothing to duplicate. Succeed */
164#define Curl_mime_set_subparts(a,b,c) CURLE_NOT_BUILT_IN
165#define Curl_mime_prepare_headers(a,b,c,d) CURLE_NOT_BUILT_IN
166#define Curl_mime_size(x) (curl_off_t) -1
167#define Curl_mime_read NULL
168#define Curl_mime_rewind(x) ((void)x, CURLE_NOT_BUILT_IN)
169#define Curl_mime_unpause(x)
170#endif
171
172
173#endif /* HEADER_CURL_MIME_H */
174