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![David Rientjes](/assets/img/avatar_default.png)
[jc: I needed to hand merge the changes to the updated codebase, so the result needs to be checked.] Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Junio C Hamano <junkio@cox.net>
863 lines
18 KiB
C
863 lines
18 KiB
C
/*
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* Another stupid program, this one parsing the headers of an
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* email to figure out authorship and subject
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*/
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#define _GNU_SOURCE
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <ctype.h>
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#ifndef NO_ICONV
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#include <iconv.h>
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#endif
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#include "git-compat-util.h"
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#include "cache.h"
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#include "builtin.h"
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static FILE *cmitmsg, *patchfile, *fin, *fout;
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static int keep_subject;
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static const char *metainfo_charset;
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static char line[1000];
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static char date[1000];
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static char name[1000];
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static char email[1000];
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static char subject[1000];
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static enum {
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TE_DONTCARE, TE_QP, TE_BASE64,
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} transfer_encoding;
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static char charset[256];
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static char multipart_boundary[1000];
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static int multipart_boundary_len;
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static int patch_lines;
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static char *sanity_check(char *name, char *email)
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{
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int len = strlen(name);
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if (len < 3 || len > 60)
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return email;
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if (strchr(name, '@') || strchr(name, '<') || strchr(name, '>'))
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return email;
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return name;
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}
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static int bogus_from(char *line)
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{
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/* John Doe <johndoe> */
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char *bra, *ket, *dst, *cp;
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/* This is fallback, so do not bother if we already have an
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* e-mail address.
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*/
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if (*email)
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return 0;
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bra = strchr(line, '<');
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if (!bra)
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return 0;
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ket = strchr(bra, '>');
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if (!ket)
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return 0;
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for (dst = email, cp = bra+1; cp < ket; )
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*dst++ = *cp++;
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*dst = 0;
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for (cp = line; isspace(*cp); cp++)
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;
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for (bra--; isspace(*bra); bra--)
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*bra = 0;
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cp = sanity_check(cp, email);
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strcpy(name, cp);
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return 1;
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}
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static int handle_from(char *in_line)
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{
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char line[1000];
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char *at;
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char *dst;
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strcpy(line, in_line);
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at = strchr(line, '@');
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if (!at)
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return bogus_from(line);
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/*
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* If we already have one email, don't take any confusing lines
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*/
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if (*email && strchr(at+1, '@'))
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return 0;
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/* Pick up the string around '@', possibly delimited with <>
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* pair; that is the email part. White them out while copying.
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*/
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while (at > line) {
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char c = at[-1];
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if (isspace(c))
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break;
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if (c == '<') {
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at[-1] = ' ';
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break;
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}
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at--;
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}
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dst = email;
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for (;;) {
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unsigned char c = *at;
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if (!c || c == '>' || isspace(c)) {
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if (c == '>')
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*at = ' ';
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break;
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}
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*at++ = ' ';
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*dst++ = c;
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}
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*dst++ = 0;
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/* The remainder is name. It could be "John Doe <john.doe@xz>"
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* or "john.doe@xz (John Doe)", but we have whited out the
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* email part, so trim from both ends, possibly removing
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* the () pair at the end.
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*/
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at = line + strlen(line);
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while (at > line) {
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unsigned char c = *--at;
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if (!isspace(c)) {
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at[(c == ')') ? 0 : 1] = 0;
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break;
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}
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}
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at = line;
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for (;;) {
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unsigned char c = *at;
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if (!c || !isspace(c)) {
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if (c == '(')
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at++;
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break;
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}
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at++;
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}
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at = sanity_check(at, email);
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strcpy(name, at);
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return 1;
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}
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static int handle_date(char *line)
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{
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strcpy(date, line);
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return 0;
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}
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static int handle_subject(char *line)
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{
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strcpy(subject, line);
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return 0;
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}
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/* NOTE NOTE NOTE. We do not claim we do full MIME. We just attempt
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* to have enough heuristics to grok MIME encoded patches often found
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* on our mailing lists. For example, we do not even treat header lines
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* case insensitively.
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*/
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static int slurp_attr(const char *line, const char *name, char *attr)
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{
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const char *ends, *ap = strcasestr(line, name);
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size_t sz;
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if (!ap) {
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*attr = 0;
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return 0;
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}
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ap += strlen(name);
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if (*ap == '"') {
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ap++;
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ends = "\"";
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}
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else
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ends = "; \t";
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sz = strcspn(ap, ends);
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memcpy(attr, ap, sz);
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attr[sz] = 0;
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return 1;
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}
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static int handle_subcontent_type(char *line)
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{
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/* We do not want to mess with boundary. Note that we do not
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* handle nested multipart.
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*/
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if (strcasestr(line, "boundary=")) {
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fprintf(stderr, "Not handling nested multipart message.\n");
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exit(1);
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}
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slurp_attr(line, "charset=", charset);
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if (*charset) {
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int i, c;
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for (i = 0; (c = charset[i]) != 0; i++)
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charset[i] = tolower(c);
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}
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return 0;
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}
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static int handle_content_type(char *line)
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{
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*multipart_boundary = 0;
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if (slurp_attr(line, "boundary=", multipart_boundary + 2)) {
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memcpy(multipart_boundary, "--", 2);
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multipart_boundary_len = strlen(multipart_boundary);
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}
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slurp_attr(line, "charset=", charset);
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return 0;
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}
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static int handle_content_transfer_encoding(char *line)
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{
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if (strcasestr(line, "base64"))
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transfer_encoding = TE_BASE64;
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else if (strcasestr(line, "quoted-printable"))
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transfer_encoding = TE_QP;
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else
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transfer_encoding = TE_DONTCARE;
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return 0;
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}
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static int is_multipart_boundary(const char *line)
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{
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return (!memcmp(line, multipart_boundary, multipart_boundary_len));
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}
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static int eatspace(char *line)
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{
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int len = strlen(line);
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while (len > 0 && isspace(line[len-1]))
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line[--len] = 0;
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return len;
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}
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#define SEEN_FROM 01
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#define SEEN_DATE 02
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#define SEEN_SUBJECT 04
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#define SEEN_BOGUS_UNIX_FROM 010
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#define SEEN_PREFIX 020
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/* First lines of body can have From:, Date:, and Subject: or empty */
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static void handle_inbody_header(int *seen, char *line)
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{
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if (*seen & SEEN_PREFIX)
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return;
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if (isspace(*line)) {
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char *cp;
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for (cp = line + 1; *cp; cp++) {
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if (!isspace(*cp))
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break;
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}
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if (!*cp)
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return;
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}
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if (!memcmp(">From", line, 5) && isspace(line[5])) {
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if (!(*seen & SEEN_BOGUS_UNIX_FROM)) {
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*seen |= SEEN_BOGUS_UNIX_FROM;
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return;
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}
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}
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if (!memcmp("From:", line, 5) && isspace(line[5])) {
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if (!(*seen & SEEN_FROM) && handle_from(line+6)) {
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*seen |= SEEN_FROM;
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return;
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}
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}
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if (!memcmp("Date:", line, 5) && isspace(line[5])) {
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if (!(*seen & SEEN_DATE)) {
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handle_date(line+6);
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*seen |= SEEN_DATE;
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return;
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}
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}
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if (!memcmp("Subject:", line, 8) && isspace(line[8])) {
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if (!(*seen & SEEN_SUBJECT)) {
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handle_subject(line+9);
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*seen |= SEEN_SUBJECT;
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return;
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}
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}
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if (!memcmp("[PATCH]", line, 7) && isspace(line[7])) {
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if (!(*seen & SEEN_SUBJECT)) {
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handle_subject(line);
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*seen |= SEEN_SUBJECT;
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return;
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}
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}
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*seen |= SEEN_PREFIX;
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}
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static char *cleanup_subject(char *subject)
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{
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if (keep_subject)
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return subject;
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for (;;) {
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char *p;
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int len, remove;
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switch (*subject) {
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case 'r': case 'R':
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if (!memcmp("e:", subject+1, 2)) {
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subject +=3;
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continue;
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}
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break;
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case ' ': case '\t': case ':':
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subject++;
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continue;
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case '[':
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p = strchr(subject, ']');
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if (!p) {
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subject++;
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continue;
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}
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len = strlen(p);
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remove = p - subject;
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if (remove <= len *2) {
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subject = p+1;
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continue;
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}
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break;
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}
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eatspace(subject);
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return subject;
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}
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}
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static void cleanup_space(char *buf)
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{
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unsigned char c;
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while ((c = *buf) != 0) {
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buf++;
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if (isspace(c)) {
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buf[-1] = ' ';
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c = *buf;
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while (isspace(c)) {
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int len = strlen(buf);
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memmove(buf, buf+1, len);
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c = *buf;
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}
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}
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}
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}
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static void decode_header(char *it);
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typedef int (*header_fn_t)(char *);
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struct header_def {
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const char *name;
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header_fn_t func;
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int namelen;
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};
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static void check_header(char *line, struct header_def *header)
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{
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int i;
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if (header[0].namelen <= 0) {
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for (i = 0; header[i].name; i++)
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header[i].namelen = strlen(header[i].name);
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}
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for (i = 0; header[i].name; i++) {
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int len = header[i].namelen;
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if (!strncasecmp(line, header[i].name, len) &&
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line[len] == ':' && isspace(line[len + 1])) {
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/* Unwrap inline B and Q encoding, and optionally
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* normalize the meta information to utf8.
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*/
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decode_header(line + len + 2);
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header[i].func(line + len + 2);
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break;
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}
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}
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}
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static void check_subheader_line(char *line)
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{
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static struct header_def header[] = {
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{ "Content-Type", handle_subcontent_type },
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{ "Content-Transfer-Encoding",
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handle_content_transfer_encoding },
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{ NULL },
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};
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check_header(line, header);
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}
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static void check_header_line(char *line)
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{
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static struct header_def header[] = {
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{ "From", handle_from },
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{ "Date", handle_date },
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{ "Subject", handle_subject },
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{ "Content-Type", handle_content_type },
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{ "Content-Transfer-Encoding",
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handle_content_transfer_encoding },
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{ NULL },
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};
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check_header(line, header);
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}
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static int is_rfc2822_header(char *line)
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{
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/*
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* The section that defines the loosest possible
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* field name is "3.6.8 Optional fields".
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*
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* optional-field = field-name ":" unstructured CRLF
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* field-name = 1*ftext
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* ftext = %d33-57 / %59-126
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*/
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int ch;
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char *cp = line;
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while ((ch = *cp++)) {
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if (ch == ':')
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return cp != line;
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if ((33 <= ch && ch <= 57) ||
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(59 <= ch && ch <= 126))
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continue;
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break;
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}
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return 0;
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}
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static int read_one_header_line(char *line, int sz, FILE *in)
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{
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int ofs = 0;
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while (ofs < sz) {
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int peek, len;
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if (fgets(line + ofs, sz - ofs, in) == NULL)
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break;
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len = eatspace(line + ofs);
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if ((len == 0) || !is_rfc2822_header(line)) {
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/* Re-add the newline */
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line[ofs + len] = '\n';
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line[ofs + len + 1] = '\0';
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break;
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}
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ofs += len;
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/* Yuck, 2822 header "folding" */
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peek = fgetc(in); ungetc(peek, in);
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if (peek != ' ' && peek != '\t')
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break;
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}
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/* Count mbox From headers as headers */
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if (!ofs && (!memcmp(line, "From ", 5) || !memcmp(line, ">From ", 6)))
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ofs = 1;
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return ofs;
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}
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static unsigned hexval(int c)
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{
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if (c >= '0' && c <= '9')
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return c - '0';
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if (c >= 'a' && c <= 'f')
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return c - 'a' + 10;
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if (c >= 'A' && c <= 'F')
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return c - 'A' + 10;
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return ~0;
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}
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static int decode_q_segment(char *in, char *ot, char *ep, int rfc2047)
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{
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int c;
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while ((c = *in++) != 0 && (in <= ep)) {
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if (c == '=') {
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int d = *in++;
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if (d == '\n' || !d)
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break; /* drop trailing newline */
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*ot++ = ((hexval(d) << 4) | hexval(*in++));
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continue;
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}
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if (rfc2047 && c == '_') /* rfc2047 4.2 (2) */
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c = 0x20;
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*ot++ = c;
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}
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*ot = 0;
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return 0;
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}
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static int decode_b_segment(char *in, char *ot, char *ep)
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{
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/* Decode in..ep, possibly in-place to ot */
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int c, pos = 0, acc = 0;
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while ((c = *in++) != 0 && (in <= ep)) {
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if (c == '+')
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c = 62;
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else if (c == '/')
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c = 63;
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else if ('A' <= c && c <= 'Z')
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c -= 'A';
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else if ('a' <= c && c <= 'z')
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c -= 'a' - 26;
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else if ('0' <= c && c <= '9')
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c -= '0' - 52;
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else if (c == '=') {
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/* padding is almost like (c == 0), except we do
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* not output NUL resulting only from it;
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* for now we just trust the data.
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*/
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c = 0;
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}
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else
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continue; /* garbage */
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switch (pos++) {
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case 0:
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acc = (c << 2);
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break;
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case 1:
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*ot++ = (acc | (c >> 4));
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acc = (c & 15) << 4;
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break;
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case 2:
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*ot++ = (acc | (c >> 2));
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acc = (c & 3) << 6;
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break;
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case 3:
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*ot++ = (acc | c);
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acc = pos = 0;
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break;
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}
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}
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*ot = 0;
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return 0;
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}
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static void convert_to_utf8(char *line, char *charset)
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{
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#ifndef NO_ICONV
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char *in, *out;
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size_t insize, outsize, nrc;
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char outbuf[4096]; /* cheat */
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static char latin_one[] = "latin1";
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char *input_charset = *charset ? charset : latin_one;
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iconv_t conv = iconv_open(metainfo_charset, input_charset);
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if (conv == (iconv_t) -1) {
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static int warned_latin1_once = 0;
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if (input_charset != latin_one) {
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fprintf(stderr, "cannot convert from %s to %s\n",
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input_charset, metainfo_charset);
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*charset = 0;
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}
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else if (!warned_latin1_once) {
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warned_latin1_once = 1;
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fprintf(stderr, "tried to convert from %s to %s, "
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"but your iconv does not work with it.\n",
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input_charset, metainfo_charset);
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}
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return;
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}
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in = line;
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insize = strlen(in);
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out = outbuf;
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outsize = sizeof(outbuf);
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nrc = iconv(conv, &in, &insize, &out, &outsize);
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|
iconv_close(conv);
|
|
if (nrc == (size_t) -1)
|
|
return;
|
|
*out = 0;
|
|
strcpy(line, outbuf);
|
|
#endif
|
|
}
|
|
|
|
static int decode_header_bq(char *it)
|
|
{
|
|
char *in, *out, *ep, *cp, *sp;
|
|
char outbuf[1000];
|
|
int rfc2047 = 0;
|
|
|
|
in = it;
|
|
out = outbuf;
|
|
while ((ep = strstr(in, "=?")) != NULL) {
|
|
int sz, encoding;
|
|
char charset_q[256], piecebuf[256];
|
|
rfc2047 = 1;
|
|
|
|
if (in != ep) {
|
|
sz = ep - in;
|
|
memcpy(out, in, sz);
|
|
out += sz;
|
|
in += sz;
|
|
}
|
|
/* E.g.
|
|
* ep : "=?iso-2022-jp?B?GyR...?= foo"
|
|
* ep : "=?ISO-8859-1?Q?Foo=FCbar?= baz"
|
|
*/
|
|
ep += 2;
|
|
cp = strchr(ep, '?');
|
|
if (!cp)
|
|
return rfc2047; /* no munging */
|
|
for (sp = ep; sp < cp; sp++)
|
|
charset_q[sp - ep] = tolower(*sp);
|
|
charset_q[cp - ep] = 0;
|
|
encoding = cp[1];
|
|
if (!encoding || cp[2] != '?')
|
|
return rfc2047; /* no munging */
|
|
ep = strstr(cp + 3, "?=");
|
|
if (!ep)
|
|
return rfc2047; /* no munging */
|
|
switch (tolower(encoding)) {
|
|
default:
|
|
return rfc2047; /* no munging */
|
|
case 'b':
|
|
sz = decode_b_segment(cp + 3, piecebuf, ep);
|
|
break;
|
|
case 'q':
|
|
sz = decode_q_segment(cp + 3, piecebuf, ep, 1);
|
|
break;
|
|
}
|
|
if (sz < 0)
|
|
return rfc2047;
|
|
if (metainfo_charset)
|
|
convert_to_utf8(piecebuf, charset_q);
|
|
strcpy(out, piecebuf);
|
|
out += strlen(out);
|
|
in = ep + 2;
|
|
}
|
|
strcpy(out, in);
|
|
strcpy(it, outbuf);
|
|
return rfc2047;
|
|
}
|
|
|
|
static void decode_header(char *it)
|
|
{
|
|
|
|
if (decode_header_bq(it))
|
|
return;
|
|
/* otherwise "it" is a straight copy of the input.
|
|
* This can be binary guck but there is no charset specified.
|
|
*/
|
|
if (metainfo_charset)
|
|
convert_to_utf8(it, "");
|
|
}
|
|
|
|
static void decode_transfer_encoding(char *line)
|
|
{
|
|
char *ep;
|
|
|
|
switch (transfer_encoding) {
|
|
case TE_QP:
|
|
ep = line + strlen(line);
|
|
decode_q_segment(line, line, ep, 0);
|
|
break;
|
|
case TE_BASE64:
|
|
ep = line + strlen(line);
|
|
decode_b_segment(line, line, ep);
|
|
break;
|
|
case TE_DONTCARE:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void handle_info(void)
|
|
{
|
|
char *sub;
|
|
|
|
sub = cleanup_subject(subject);
|
|
cleanup_space(name);
|
|
cleanup_space(date);
|
|
cleanup_space(email);
|
|
cleanup_space(sub);
|
|
|
|
fprintf(fout, "Author: %s\nEmail: %s\nSubject: %s\nDate: %s\n\n",
|
|
name, email, sub, date);
|
|
}
|
|
|
|
/* We are inside message body and have read line[] already.
|
|
* Spit out the commit log.
|
|
*/
|
|
static int handle_commit_msg(int *seen)
|
|
{
|
|
if (!cmitmsg)
|
|
return 0;
|
|
do {
|
|
if (!memcmp("diff -", line, 6) ||
|
|
!memcmp("---", line, 3) ||
|
|
!memcmp("Index: ", line, 7))
|
|
break;
|
|
if ((multipart_boundary[0] && is_multipart_boundary(line))) {
|
|
/* We come here when the first part had only
|
|
* the commit message without any patch. We
|
|
* pretend we have not seen this line yet, and
|
|
* go back to the loop.
|
|
*/
|
|
return 1;
|
|
}
|
|
|
|
/* Unwrap transfer encoding and optionally
|
|
* normalize the log message to UTF-8.
|
|
*/
|
|
decode_transfer_encoding(line);
|
|
if (metainfo_charset)
|
|
convert_to_utf8(line, charset);
|
|
|
|
handle_inbody_header(seen, line);
|
|
if (!(*seen & SEEN_PREFIX))
|
|
continue;
|
|
|
|
fputs(line, cmitmsg);
|
|
} while (fgets(line, sizeof(line), fin) != NULL);
|
|
fclose(cmitmsg);
|
|
cmitmsg = NULL;
|
|
return 0;
|
|
}
|
|
|
|
/* We have done the commit message and have the first
|
|
* line of the patch in line[].
|
|
*/
|
|
static void handle_patch(void)
|
|
{
|
|
do {
|
|
if (multipart_boundary[0] && is_multipart_boundary(line))
|
|
break;
|
|
/* Only unwrap transfer encoding but otherwise do not
|
|
* do anything. We do *NOT* want UTF-8 conversion
|
|
* here; we are dealing with the user payload.
|
|
*/
|
|
decode_transfer_encoding(line);
|
|
fputs(line, patchfile);
|
|
patch_lines++;
|
|
} while (fgets(line, sizeof(line), fin) != NULL);
|
|
}
|
|
|
|
/* multipart boundary and transfer encoding are set up for us, and we
|
|
* are at the end of the sub header. do equivalent of handle_body up
|
|
* to the next boundary without closing patchfile --- we will expect
|
|
* that the first part to contain commit message and a patch, and
|
|
* handle other parts as pure patches.
|
|
*/
|
|
static int handle_multipart_one_part(int *seen)
|
|
{
|
|
int n = 0;
|
|
|
|
while (fgets(line, sizeof(line), fin) != NULL) {
|
|
again:
|
|
n++;
|
|
if (is_multipart_boundary(line))
|
|
break;
|
|
if (handle_commit_msg(seen))
|
|
goto again;
|
|
handle_patch();
|
|
break;
|
|
}
|
|
if (n == 0)
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
static void handle_multipart_body(void)
|
|
{
|
|
int seen = 0;
|
|
int part_num = 0;
|
|
|
|
/* Skip up to the first boundary */
|
|
while (fgets(line, sizeof(line), fin) != NULL)
|
|
if (is_multipart_boundary(line)) {
|
|
part_num = 1;
|
|
break;
|
|
}
|
|
if (!part_num)
|
|
return;
|
|
/* We are on boundary line. Start slurping the subhead. */
|
|
while (1) {
|
|
int hdr = read_one_header_line(line, sizeof(line), fin);
|
|
if (!hdr) {
|
|
if (handle_multipart_one_part(&seen) < 0)
|
|
return;
|
|
/* Reset per part headers */
|
|
transfer_encoding = TE_DONTCARE;
|
|
charset[0] = 0;
|
|
}
|
|
else
|
|
check_subheader_line(line);
|
|
}
|
|
fclose(patchfile);
|
|
if (!patch_lines) {
|
|
fprintf(stderr, "No patch found\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
/* Non multipart message */
|
|
static void handle_body(void)
|
|
{
|
|
int seen = 0;
|
|
|
|
handle_commit_msg(&seen);
|
|
handle_patch();
|
|
fclose(patchfile);
|
|
if (!patch_lines) {
|
|
fprintf(stderr, "No patch found\n");
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
int mailinfo(FILE *in, FILE *out, int ks, const char *encoding,
|
|
const char *msg, const char *patch)
|
|
{
|
|
keep_subject = ks;
|
|
metainfo_charset = encoding;
|
|
fin = in;
|
|
fout = out;
|
|
|
|
cmitmsg = fopen(msg, "w");
|
|
if (!cmitmsg) {
|
|
perror(msg);
|
|
return -1;
|
|
}
|
|
patchfile = fopen(patch, "w");
|
|
if (!patchfile) {
|
|
perror(patch);
|
|
fclose(cmitmsg);
|
|
return -1;
|
|
}
|
|
while (1) {
|
|
int hdr = read_one_header_line(line, sizeof(line), fin);
|
|
if (!hdr) {
|
|
if (multipart_boundary[0])
|
|
handle_multipart_body();
|
|
else
|
|
handle_body();
|
|
handle_info();
|
|
break;
|
|
}
|
|
check_header_line(line);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const char mailinfo_usage[] =
|
|
"git-mailinfo [-k] [-u | --encoding=<encoding>] msg patch <mail >info";
|
|
|
|
int cmd_mailinfo(int argc, const char **argv, const char *prefix)
|
|
{
|
|
/* NEEDSWORK: might want to do the optional .git/ directory
|
|
* discovery
|
|
*/
|
|
git_config(git_default_config);
|
|
|
|
while (1 < argc && argv[1][0] == '-') {
|
|
if (!strcmp(argv[1], "-k"))
|
|
keep_subject = 1;
|
|
else if (!strcmp(argv[1], "-u"))
|
|
metainfo_charset = git_commit_encoding;
|
|
else if (!strncmp(argv[1], "--encoding=", 11))
|
|
metainfo_charset = argv[1] + 11;
|
|
else
|
|
usage(mailinfo_usage);
|
|
argc--; argv++;
|
|
}
|
|
|
|
if (argc != 3)
|
|
usage(mailinfo_usage);
|
|
|
|
return !!mailinfo(stdin, stdout, keep_subject, metainfo_charset, argv[1], argv[2]);
|
|
}
|