From a8305a9543969206aa7cec03948c5a19950eedb9 Mon Sep 17 00:00:00 2001 From: Lars Hjemli Date: Sun, 14 Sep 2008 09:45:37 +0200 Subject: parsing.c: be prepared for unexpected content in commit/tag objects When parsing commits and tags cgit made too many assumptions about the formatting of said objects. This patch tries to make the code be more prepared to handle 'malformed' objects. Signed-off-by: Lars Hjemli --- cgit.h | 2 +- parsing.c | 159 +++++++++++++++++++++++++++++++++++++------------------------- 2 files changed, 97 insertions(+), 64 deletions(-) diff --git a/cgit.h b/cgit.h index 1615616..08fd95a 100644 --- a/cgit.h +++ b/cgit.h @@ -85,7 +85,7 @@ struct commitinfo { struct taginfo { char *tagger; char *tagger_email; - int tagger_date; + unsigned long tagger_date; char *msg; }; diff --git a/parsing.c b/parsing.c index 66e8b3d..c8f3048 100644 --- a/parsing.c +++ b/parsing.c @@ -62,6 +62,55 @@ char *substr(const char *head, const char *tail) return buf; } +char *parse_user(char *t, char **name, char **email, unsigned long *date) +{ + char *p = t; + int mode = 1; + + while (p && *p) { + if (mode == 1 && *p == '<') { + *name = substr(t, p - 1); + t = p; + mode++; + } else if (mode == 1 && *p == '\n') { + *name = substr(t, p); + p++; + break; + } else if (mode == 2 && *p == '>') { + *email = substr(t, p + 1); + t = p; + mode++; + } else if (mode == 2 && *p == '\n') { + *email = substr(t, p); + p++; + break; + } else if (mode == 3 && isdigit(*p)) { + *date = atol(p); + mode++; + } else if (*p == '\n') { + p++; + break; + } + p++; + } + return p; +} + +const char *reencode(char **txt, const char *src_enc, const char *dst_enc) +{ + char *tmp; + + if (!txt || !*txt || !src_enc || !dst_enc) + return *txt; + + tmp = reencode_string(*txt, src_enc, dst_enc); + if (tmp) { + free(*txt); + *txt = tmp; + } + return *txt; +} + struct commitinfo *cgit_parse_commit(struct commit *commit) { struct commitinfo *ret; @@ -88,70 +137,57 @@ struct commitinfo *cgit_parse_commit(struct commit *commit) while (!strncmp(p, "parent ", 7)) p += 48; // "parent " + hex[40] + "\n" - if (!strncmp(p, "author ", 7)) { - p += 7; - t = strchr(p, '<') - 1; - ret->author = substr(p, t); - p = t; - t = strchr(t, '>') + 1; - ret->author_email = substr(p, t); - ret->author_date = atol(t+1); - p = strchr(t, '\n') + 1; + if (p && !strncmp(p, "author ", 7)) { + p = parse_user(p + 7, &ret->author, &ret->author_email, + &ret->author_date); } - if (!strncmp(p, "committer ", 9)) { - p += 9; - t = strchr(p, '<') - 1; - ret->committer = substr(p, t); - p = t; - t = strchr(t, '>') + 1; - ret->committer_email = substr(p, t); - ret->committer_date = atol(t+1); - p = strchr(t, '\n') + 1; + if (p && !strncmp(p, "committer ", 9)) { + p = parse_user(p + 9, &ret->committer, &ret->committer_email, + &ret->committer_date); } - if (!strncmp(p, "encoding ", 9)) { + if (p && !strncmp(p, "encoding ", 9)) { p += 9; - t = strchr(p, '\n') + 1; - ret->msg_encoding = substr(p, t); - p = t; - } else - ret->msg_encoding = xstrdup(PAGE_ENCODING); + t = strchr(p, '\n'); + if (t) { + ret->msg_encoding = substr(p, t + 1); + p = t + 1; + } + } - while (*p && (*p != '\n')) - p = strchr(p, '\n') + 1; // skip unknown header fields + // skip unknown header fields + while (p && *p && (*p != '\n')) { + p = strchr(p, '\n'); + if (p) + p++; + } - while (*p == '\n') - p = strchr(p, '\n') + 1; + // skip empty lines between headers and message + while (p && *p == '\n') + p++; + + if (!p) + return ret; t = strchr(p, '\n'); if (t) { - if (*t == '\0') - ret->subject = "** empty **"; - else - ret->subject = substr(p, t); + ret->subject = substr(p, t); p = t + 1; - while (*p == '\n') - p = strchr(p, '\n') + 1; - ret->msg = xstrdup(p); - } else - ret->subject = substr(p, p+strlen(p)); - - if(strcmp(ret->msg_encoding, PAGE_ENCODING)) { - t = reencode_string(ret->subject, PAGE_ENCODING, - ret->msg_encoding); - if(t) { - free(ret->subject); - ret->subject = t; + while (p && *p == '\n') { + p = strchr(p, '\n'); + if (p) + p++; } + if (p) + ret->msg = xstrdup(p); + } else + ret->subject = xstrdup(p); - t = reencode_string(ret->msg, PAGE_ENCODING, - ret->msg_encoding); - if(t) { - free(ret->msg); - ret->msg = t; - } + if (ret->msg_encoding) { + reencode(&ret->subject, PAGE_ENCODING, ret->msg_encoding); + reencode(&ret->msg, PAGE_ENCODING, ret->msg_encoding); } return ret; @@ -163,7 +199,7 @@ struct taginfo *cgit_parse_tag(struct tag *tag) void *data; enum object_type type; unsigned long size; - char *p, *t; + char *p; struct taginfo *ret; data = read_sha1_file(tag->object.sha1, &type, &size); @@ -185,22 +221,19 @@ struct taginfo *cgit_parse_tag(struct tag *tag) break; if (!strncmp(p, "tagger ", 7)) { - p += 7; - t = strchr(p, '<') - 1; - ret->tagger = substr(p, t); - p = t; - t = strchr(t, '>') + 1; - ret->tagger_email = substr(p, t); - ret->tagger_date = atol(t+1); + p = parse_user(p + 7, &ret->tagger, &ret->tagger_email, + &ret->tagger_date); + } else { + p = strchr(p, '\n'); + if (p) + p++; } - p = strchr(p, '\n') + 1; } - while (p && *p && (*p != '\n')) - p = strchr(p, '\n') + 1; // skip unknown tag fields + // skip empty lines between headers and message + while (p && *p == '\n') + p++; - while (p && (*p == '\n')) - p = strchr(p, '\n') + 1; if (p && *p) ret->msg = xstrdup(p); free(data); -- cgit v1.2.3-59-g8ed1b