Added cmake support and replaced unsafe string functions with safe ones #25
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rilysh
reviewed
Mar 29, 2024
| sscanf(rh->owner, "%o", &h->owner); | ||
| sscanf(rh->size, "%o", &h->size); | ||
| sscanf(rh->mtime, "%o", &h->mtime); | ||
| sscanf(rh->mode, "%8o", &h->mode); |
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You don't need to specify octal size for h->mode, h->owner, and h->mtime. They're fixed values and guaranteed will not "overflow" from it's range.
rilysh
reviewed
Mar 29, 2024
src/microtar.c
Outdated
| strcpy(h->linkname, rh->linkname); | ||
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| // Here we can memcpy because both buffers have the same size | ||
| memcpy(h->name, rh->name, name_buf_width); |
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Use sizeof for array here for either h->name or rh->name. They both are same sized.
rilysh
reviewed
Mar 29, 2024
| sprintf(rh->owner, "%o", h->owner); | ||
| sprintf(rh->size, "%o", h->size); | ||
| sprintf(rh->mtime, "%o", h->mtime); | ||
| snprintf(rh->mode, 8, "%o", h->mode); |
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Same, you don't need to explicitly specify size here. It will not overflow
rilysh
reviewed
Mar 29, 2024
src/microtar.c
Outdated
| @@ -333,7 +349,7 @@ int mtar_write_file_header(mtar_t *tar, const char *name, unsigned size) { | |||
| mtar_header_t h; | |||
| /* Build header */ | |||
| memset(&h, 0, sizeof(h)); | |||
| strcpy(h.name, name); | |||
| guarded_strcpy(h.name, name, name_buf_width); | |||
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Considering the project activity was about 6 or 7 years ago, and since then no PRs are merged, I think you should generally avoid the hassle of creating PRs on this repository. Instead, you may wanna apply (your changes) in your local tree (project). |
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I modified the library to make it fit for my use and I thought I share it here.
The
nameandlinknamefields in themtar_header_tstruct are both 100 bytes long as mandated by the tar format. The tar format does allow longer names but this seems not supported by this library. Filename size is not checked by the library resulting in corrupted archives if a longer name is specified. I changed the behaviour to printing an error message and callingabort()if a name longer than 100 characters (including null terminator) is specified.While I was at it I also changed all other string functions that are considered unsafe to their safe alternatives.