diff options
Diffstat (limited to 'lib/dpkg/ar.c')
| -rw-r--r-- | lib/dpkg/ar.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/lib/dpkg/ar.c b/lib/dpkg/ar.c new file mode 100644 index 0000000..6eea5ad --- /dev/null +++ b/lib/dpkg/ar.c @@ -0,0 +1,234 @@ +/* + * libdpkg - Debian packaging suite library routines + * ar.c - primitives for ar handling + * + * Copyright © 2010 Guillem Jover <guillem@debian.org> + * + * This is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see <https://www.gnu.org/licenses/>. + */ + +#include <config.h> +#include <compat.h> + +#include <sys/types.h> +#include <sys/stat.h> + +#include <time.h> +#include <fcntl.h> +#include <stdint.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> + +#include <dpkg/i18n.h> +#include <dpkg/dpkg.h> +#include <dpkg/fdio.h> +#include <dpkg/buffer.h> +#include <dpkg/ar.h> + +struct dpkg_ar * +dpkg_ar_fdopen(const char *filename, int fd) +{ + struct dpkg_ar *ar; + struct stat st; + + if (fstat(fd, &st) != 0) + ohshite(_("failed to fstat archive")); + + ar = m_malloc(sizeof(*ar)); + ar->name = filename; + ar->mode = st.st_mode; + ar->size = st.st_size; + ar->time = st.st_mtime; + ar->fd = fd; + + return ar; +} + +struct dpkg_ar * +dpkg_ar_open(const char *filename) +{ + int fd; + + if (strcmp(filename, "-") == 0) + fd = STDIN_FILENO; + else + fd = open(filename, O_RDONLY); + if (fd < 0) + ohshite(_("failed to read archive '%.255s'"), filename); + + return dpkg_ar_fdopen(filename, fd); +} + +struct dpkg_ar * +dpkg_ar_create(const char *filename, mode_t mode) +{ + int fd; + + fd = creat(filename, mode); + if (fd < 0) + ohshite(_("unable to create '%.255s'"), filename); + + return dpkg_ar_fdopen(filename, fd); +} + +void +dpkg_ar_set_mtime(struct dpkg_ar *ar, intmax_t mtime) +{ + ar->time = mtime; +} + +void +dpkg_ar_close(struct dpkg_ar *ar) +{ + if (close(ar->fd)) + ohshite(_("unable to close file '%s'"), ar->name); + free(ar); +} + +static void +dpkg_ar_member_init(struct dpkg_ar *ar, struct dpkg_ar_member *member, + const char *name, off_t size) +{ + member->name = name; + member->size = size; + member->time = ar->time; + member->mode = 0100644; + member->uid = 0; + member->gid = 0; +} + +void +dpkg_ar_normalize_name(struct dpkg_ar_hdr *arh) +{ + char *name = arh->ar_name; + int i; + + /* Remove trailing spaces from the member name. */ + for (i = sizeof(arh->ar_name) - 1; i >= 0 && name[i] == ' '; i--) + name[i] = '\0'; + + /* Remove optional slash terminator (on GNU-style archives). */ + if (i >= 0 && name[i] == '/') + name[i] = '\0'; +} + +off_t +dpkg_ar_member_get_size(struct dpkg_ar *ar, struct dpkg_ar_hdr *arh) +{ + const char *str = arh->ar_size; + int len = sizeof(arh->ar_size); + off_t size = 0; + + while (len && *str == ' ') + str++, len--; + + while (len--) { + if (*str == ' ') + break; + if (*str < '0' || *str > '9') + ohshit(_("invalid character '%c' in archive '%.250s' " + "member '%.16s' size"), + *str, ar->name, arh->ar_name); + + size *= 10; + size += *str++ - '0'; + } + + return size; +} + +bool +dpkg_ar_member_is_illegal(struct dpkg_ar_hdr *arh) +{ + return memcmp(arh->ar_fmag, DPKG_AR_FMAG, sizeof(arh->ar_fmag)) != 0; +} + +void +dpkg_ar_put_magic(struct dpkg_ar *ar) +{ + if (fd_write(ar->fd, DPKG_AR_MAGIC, strlen(DPKG_AR_MAGIC)) < 0) + ohshite(_("unable to write file '%s'"), ar->name); +} + +void +dpkg_ar_member_put_header(struct dpkg_ar *ar, struct dpkg_ar_member *member) +{ + char header[sizeof(struct dpkg_ar_hdr) + 1]; + int n; + + if (strlen(member->name) > 15) + ohshit(_("ar member name '%s' length too long"), member->name); + if (member->size > 9999999999L) + ohshit(_("ar member size %jd too large"), (intmax_t)member->size); + if (member->time > 999999999999L) + ohshit(_("ar member time %jd too large"), (intmax_t)member->time); + + n = snprintf(header, sizeof(struct dpkg_ar_hdr) + 1, + "%-16s%-12jd%-6lu%-6lu%-8lo%-10jd`\n", + member->name, (intmax_t)member->time, + (unsigned long)member->uid, (unsigned long)member->gid, + (unsigned long)member->mode, (intmax_t)member->size); + if (n != sizeof(struct dpkg_ar_hdr)) + ohshit(_("generated corrupt ar header for '%s'"), ar->name); + + if (fd_write(ar->fd, header, n) < 0) + ohshite(_("unable to write file '%s'"), ar->name); +} + +void +dpkg_ar_member_put_mem(struct dpkg_ar *ar, + const char *name, const void *data, size_t size) +{ + struct dpkg_ar_member member; + + dpkg_ar_member_init(ar, &member, name, size); + dpkg_ar_member_put_header(ar, &member); + + /* Copy data contents. */ + if (fd_write(ar->fd, data, size) < 0) + ohshite(_("unable to write file '%s'"), ar->name); + + if (size & 1) + if (fd_write(ar->fd, "\n", 1) < 0) + ohshite(_("unable to write file '%s'"), ar->name); +} + +void +dpkg_ar_member_put_file(struct dpkg_ar *ar, + const char *name, int fd, off_t size) +{ + struct dpkg_error err; + struct dpkg_ar_member member; + + if (size <= 0) { + struct stat st; + + if (fstat(fd, &st)) + ohshite(_("failed to fstat ar member file (%s)"), name); + size = st.st_size; + } + + dpkg_ar_member_init(ar, &member, name, size); + dpkg_ar_member_put_header(ar, &member); + + /* Copy data contents. */ + if (fd_fd_copy(fd, ar->fd, size, &err) < 0) + ohshit(_("cannot append ar member file (%s) to '%s': %s"), + name, ar->name, err.str); + + if (size & 1) + if (fd_write(ar->fd, "\n", 1) < 0) + ohshite(_("unable to write file '%s'"), ar->name); +} |