1: #ifndef HEADER_CURL_MIME_H
2: #define HEADER_CURL_MIME_H
3: /***************************************************************************
4: * _ _ ____ _
5: * Project ___| | | | _ \| |
6: * / __| | | | |_) | |
7: * | (__| |_| | _ <| |___
8: * \___|\___/|_| \_\_____|
9: *
10: * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, 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.haxx.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: ***************************************************************************/
24:
25: #include "curl_setup.h"
26:
27: #define MIME_RAND_BOUNDARY_CHARS 16 /* Nb. of random boundary chars. */
28: #define MAX_ENCODED_LINE_LENGTH 76 /* Maximum encoded line length. */
29: #define ENCODING_BUFFER_SIZE 256 /* Encoding temp buffers size. */
30:
31: /* Part flags. */
32: #define MIME_USERHEADERS_OWNER (1 << 0)
33: #define MIME_BODY_ONLY (1 << 1)
34: #define MIME_FAST_READ (1 << 2)
35:
36: #define FILE_CONTENTTYPE_DEFAULT "application/octet-stream"
37: #define MULTIPART_CONTENTTYPE_DEFAULT "multipart/mixed"
38: #define DISPOSITION_DEFAULT "attachment"
39:
40: /* Part source kinds. */
41: enum mimekind {
42: MIMEKIND_NONE = 0, /* Part not set. */
43: MIMEKIND_DATA, /* Allocated mime data. */
44: MIMEKIND_FILE, /* Data from file. */
45: MIMEKIND_CALLBACK, /* Data from `read' callback. */
46: MIMEKIND_MULTIPART, /* Data is a mime subpart. */
47: MIMEKIND_LAST
48: };
49:
50: /* Readback state tokens. */
51: enum mimestate {
52: MIMESTATE_BEGIN, /* Readback has not yet started. */
53: MIMESTATE_CURLHEADERS, /* In curl-generated headers. */
54: MIMESTATE_USERHEADERS, /* In caller's supplied headers. */
55: MIMESTATE_EOH, /* End of headers. */
56: MIMESTATE_BODY, /* Placeholder. */
57: MIMESTATE_BOUNDARY1, /* In boundary prefix. */
58: MIMESTATE_BOUNDARY2, /* In boundary. */
59: MIMESTATE_CONTENT, /* In content. */
60: MIMESTATE_END, /* End of part reached. */
61: MIMESTATE_LAST
62: };
63:
64: /* Mime headers strategies. */
65: enum mimestrategy {
66: MIMESTRATEGY_MAIL, /* Mime mail. */
67: MIMESTRATEGY_FORM, /* HTTP post form. */
68: MIMESTRATEGY_LAST
69: };
70:
71: /* Content transfer encoder. */
72: typedef struct {
73: const char * name; /* Encoding name. */
74: size_t (*encodefunc)(char *buffer, size_t size, bool ateof,
75: curl_mimepart *part); /* Encoded read. */
76: curl_off_t (*sizefunc)(curl_mimepart *part); /* Encoded size. */
77: } mime_encoder;
78:
79: /* Content transfer encoder state. */
80: typedef struct {
81: size_t pos; /* Position on output line. */
82: size_t bufbeg; /* Next data index in input buffer. */
83: size_t bufend; /* First unused byte index in input buffer. */
84: char buf[ENCODING_BUFFER_SIZE]; /* Input buffer. */
85: } mime_encoder_state;
86:
87: /* Mime readback state. */
88: typedef struct {
89: enum mimestate state; /* Current state token. */
90: void *ptr; /* State-dependent pointer. */
91: curl_off_t offset; /* State-dependent offset. */
92: } mime_state;
93:
94: /* minimum buffer size for the boundary string */
95: #define MIME_BOUNDARY_LEN (24 + MIME_RAND_BOUNDARY_CHARS + 1)
96:
97: /* A mime multipart. */
98: struct curl_mime_s {
99: struct Curl_easy *easy; /* The associated easy handle. */
100: curl_mimepart *parent; /* Parent part. */
101: curl_mimepart *firstpart; /* First part. */
102: curl_mimepart *lastpart; /* Last part. */
103: char boundary[MIME_BOUNDARY_LEN]; /* The part boundary. */
104: mime_state state; /* Current readback state. */
105: };
106:
107: /* A mime part. */
108: struct curl_mimepart_s {
109: struct Curl_easy *easy; /* The associated easy handle. */
110: curl_mime *parent; /* Parent mime structure. */
111: curl_mimepart *nextpart; /* Forward linked list. */
112: enum mimekind kind; /* The part kind. */
113: char *data; /* Memory data or file name. */
114: curl_read_callback readfunc; /* Read function. */
115: curl_seek_callback seekfunc; /* Seek function. */
116: curl_free_callback freefunc; /* Argument free function. */
117: void *arg; /* Argument to callback functions. */
118: FILE *fp; /* File pointer. */
119: struct curl_slist *curlheaders; /* Part headers. */
120: struct curl_slist *userheaders; /* Part headers. */
121: char *mimetype; /* Part mime type. */
122: char *filename; /* Remote file name. */
123: char *name; /* Data name. */
124: curl_off_t datasize; /* Expected data size. */
125: unsigned int flags; /* Flags. */
126: mime_state state; /* Current readback state. */
127: const mime_encoder *encoder; /* Content data encoder. */
128: mime_encoder_state encstate; /* Data encoder state. */
129: size_t lastreadstatus; /* Last read callback returned status. */
130: };
131:
132: CURLcode Curl_mime_add_header(struct curl_slist **slp, const char *fmt, ...);
133:
134: #if (!defined(CURL_DISABLE_HTTP) && !defined(CURL_DISABLE_MIME)) || \
135: !defined(CURL_DISABLE_SMTP) || !defined(CURL_DISABLE_IMAP)
136:
137: /* Prototypes. */
138: void Curl_mime_initpart(curl_mimepart *part, struct Curl_easy *easy);
139: void Curl_mime_cleanpart(curl_mimepart *part);
140: CURLcode Curl_mime_duppart(curl_mimepart *dst, const curl_mimepart *src);
141: CURLcode Curl_mime_set_subparts(curl_mimepart *part,
142: curl_mime *subparts, int take_ownership);
143: CURLcode Curl_mime_prepare_headers(curl_mimepart *part,
144: const char *contenttype,
145: const char *disposition,
146: enum mimestrategy strategy);
147: curl_off_t Curl_mime_size(curl_mimepart *part);
148: size_t Curl_mime_read(char *buffer, size_t size, size_t nitems,
149: void *instream);
150: CURLcode Curl_mime_rewind(curl_mimepart *part);
151: const char *Curl_mime_contenttype(const char *filename);
152: void Curl_mime_unpause(curl_mimepart *part);
153:
154: #else
155: /* if disabled */
156: #define Curl_mime_initpart(x,y)
157: #define Curl_mime_cleanpart(x)
158: #define Curl_mime_duppart(x,y) CURLE_OK /* Nothing to duplicate. Succeed */
159: #define Curl_mime_set_subparts(a,b,c) CURLE_NOT_BUILT_IN
160: #define Curl_mime_prepare_headers(a,b,c,d) CURLE_NOT_BUILT_IN
161: #define Curl_mime_size(x) (curl_off_t) -1
162: #define Curl_mime_read NULL
163: #define Curl_mime_rewind(x) ((void)x, CURLE_NOT_BUILT_IN)
164: #define Curl_mime_unpause(x)
165: #endif
166:
167:
168: #endif /* HEADER_CURL_MIME_H */
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