/*- * Copyright (c) 2008 Sean C. Farley * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer, * without modification, immediately at the beginning of the file. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include struct group_storage { struct group gr; char *members[]; }; static const char group_line_format[] = "%s:%s:%ju:"; /* * Compares two struct group's. */ int gr_equal(const struct group *gr1, const struct group *gr2) { int gr1_ndx; int gr2_ndx; bool found; /* Check that the non-member information is the same. */ if (gr1->gr_name == NULL || gr2->gr_name == NULL) { if (gr1->gr_name != gr2->gr_name) return (false); } else if (strcmp(gr1->gr_name, gr2->gr_name) != 0) return (false); if (gr1->gr_passwd == NULL || gr2->gr_passwd == NULL) { if (gr1->gr_passwd != gr2->gr_passwd) return (false); } else if (strcmp(gr1->gr_passwd, gr2->gr_passwd) != 0) return (false); if (gr1->gr_gid != gr2->gr_gid) return (false); /* Check all members in both groups. */ if (gr1->gr_mem == NULL || gr2->gr_mem == NULL) { if (gr1->gr_mem != gr2->gr_mem) return (false); } else { for (found = false, gr1_ndx = 0; gr1->gr_mem[gr1_ndx] != NULL; gr1_ndx++) { for (gr2_ndx = 0; gr2->gr_mem[gr2_ndx] != NULL; gr2_ndx++) if (strcmp(gr1->gr_mem[gr1_ndx], gr2->gr_mem[gr2_ndx]) == 0) { found = true; break; } if (!found) return (false); } /* Check that group2 does not have more members than group1. */ if (gr2->gr_mem[gr1_ndx] != NULL) return (false); } return (true); } /* * Make a group line out of a struct group. */ char * gr_make(const struct group *gr) { char *line; size_t line_size; int ndx; /* Calculate the length of the group line. */ line_size = snprintf(NULL, 0, group_line_format, gr->gr_name, gr->gr_passwd, (uintmax_t)gr->gr_gid) + 1; if (gr->gr_mem != NULL) { for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++) line_size += strlen(gr->gr_mem[ndx]) + 1; if (ndx > 0) line_size--; } /* Create the group line and fill it. */ if ((line = malloc(line_size)) == NULL) return (NULL); snprintf(line, line_size, group_line_format, gr->gr_name, gr->gr_passwd, (uintmax_t)gr->gr_gid); if (gr->gr_mem != NULL) for (ndx = 0; gr->gr_mem[ndx] != NULL; ndx++) { strcat(line, gr->gr_mem[ndx]); if (gr->gr_mem[ndx + 1] != NULL) strcat(line, ","); } return (line); } /* * Duplicate a struct group. */ struct group * gr_dup(const struct group *gr) { char *dst; size_t len; struct group_storage *gs; int ndx; int num_mem; /* Calculate size of the group. */ len = sizeof(*gs); if (gr->gr_name != NULL) len += strlen(gr->gr_name) + 1; if (gr->gr_passwd != NULL) len += strlen(gr->gr_passwd) + 1; if (gr->gr_mem != NULL) { for (num_mem = 0; gr->gr_mem[num_mem] != NULL; num_mem++) len += strlen(gr->gr_mem[num_mem]) + 1; len += (num_mem + 1) * sizeof(*gr->gr_mem); } else num_mem = -1; /* Create new group and copy old group into it. */ if ((gs = calloc(1, len)) == NULL) return (NULL); dst = (char *)&gs->members[num_mem + 1]; if (gr->gr_name != NULL) { gs->gr.gr_name = dst; dst = stpcpy(gs->gr.gr_name, gr->gr_name) + 1; } if (gr->gr_passwd != NULL) { gs->gr.gr_passwd = dst; dst = stpcpy(gs->gr.gr_passwd, gr->gr_passwd) + 1; } gs->gr.gr_gid = gr->gr_gid; if (gr->gr_mem != NULL) { gs->gr.gr_mem = gs->members; for (ndx = 0; ndx < num_mem; ndx++) { gs->gr.gr_mem[ndx] = dst; dst = stpcpy(gs->gr.gr_mem[ndx], gr->gr_mem[ndx]) + 1; } gs->gr.gr_mem[ndx] = NULL; } return (&gs->gr); } /* * Scan a line and place it into a group structure. */ static bool __gr_scan(char *line, struct group *gr) { char *loc; int ndx; /* Assign non-member information to structure. */ gr->gr_name = line; if ((loc = strchr(line, ':')) == NULL) return (false); *loc = '\0'; gr->gr_passwd = loc + 1; if (*gr->gr_passwd == ':') *gr->gr_passwd = '\0'; else { if ((loc = strchr(loc + 1, ':')) == NULL) return (false); *loc = '\0'; } if (sscanf(loc + 1, "%u", &gr->gr_gid) != 1) return (false); /* Assign member information to structure. */ if ((loc = strchr(loc + 1, ':')) == NULL) return (false); line = loc + 1; gr->gr_mem = NULL; ndx = 0; do { gr->gr_mem = reallocf(gr->gr_mem, sizeof(*gr->gr_mem) * (ndx + 1)); if (gr->gr_mem == NULL) return (false); /* Skip locations without members (i.e., empty string). */ do { gr->gr_mem[ndx] = strsep(&line, ","); } while (gr->gr_mem[ndx] != NULL && *gr->gr_mem[ndx] == '\0'); } while (gr->gr_mem[ndx++] != NULL); return (true); } /* * Create a struct group from a line. */ struct group * gr_scan(const char *line) { struct group gr; char *line_copy; struct group *new_gr; if ((line_copy = strdup(line)) == NULL) return (NULL); if (!__gr_scan(line_copy, &gr)) { free(line_copy); return (NULL); } new_gr = gr_dup(&gr); free(line_copy); if (gr.gr_mem != NULL) free(gr.gr_mem); return (new_gr); }